tension on inclined plane

The slide moved at a velocity of up to 160.9 kph (100 mph), creating an incredible air blast that swept through the Rock Creek Campground. It is a flat surface that is sloped rather than horizontal. Water content can increase due to rapidly melting snow or ice or an intense rain event. If you're seeing this message, it means we're having trouble loading external resources on our website. This landslide was likely the result of material released from the side of a growing laccolith (a type of igneous intrusion) see Chapter 4), after being triggered by an eruption-related earthquake. Examples include slides, ramps, and slopes. Found inside – Page 52A fixed pulley lies on a smooth inclined plane , elevation a ; the ends of the ... Shew that the tension of the thread is unaltered when th of its mass is ... If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Found inside – Page 200The occurrence of a single plane of tension inclined to the axis , or the ... result of three planes of tension inclined at equal angles to the axis and ... Other signs of landslides include tilted or offset structures or natural features that would normally be vertical or in place. Mass-wasting events are triggered by changes that oversteepen slope angles and weaken slope stability, such as rapid snow melt, intense rainfall, earthquake shaking, volcanic eruption, storm waves, stream erosion, and human activities. This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...6. Unfortunately, in January 2017, parts of the slope have shown reactivation movement. Radar systems maintained by the mine operator warned of movement of the wall, preventing the loss of life and limiting the loss of property. Sometimes the most economical way to deal with a landslide hazard is to divert and slow the falling material. A geologic park was constructed in the now vacant area. 2014, North Salt Lake Slide: In August 2014 after a particularly wet period, a slow moving rotational landslide destroyed one home and damaged nearby tennis courts. When you multiply something very big by something very small you usually get something in between, that is something medium if I can put it this way. A flat slanting surface, connecting a lower level to a higher level. This knowledge has brought them closer to predicting where and how these potentially hazardous events may occur and how people can be protected. Found inside – Page 234Only by generating and retaining needed tension in the assembly can equilibrium ... release of applied tension and permit slippage on the inclined plane . Excessive precipitation is the most common trigger. Main scarps are formed by movement of the displaced material away from the undisturbed ground and are the visible part of slide rupture surface. A force has both magnitude and direction, making it a vector quantity. And, in any case, gravity is an external force on the object, so there is no reason for conservation of momentum of the falling object and bouncing object. For rockfall-prone areas, sometimes it is economical to use long steel bolts. The 2005 slide damaged 36 houses and killed 10 people. In all of these cases the shielding has to be engineered to a scale that is greater than the slide, or catastrophic loss in property and life could result. Khan Academy is a 501(c)(3) nonprofit organization. In the figure, a block of rock situated on a slope is pulled down toward the Earth’s center by the force of gravity (fg). The toe of the landslide marks the end of the moving material. The external forces applied to the system and the reactions at the supports are generally applied at the nodes. 10 questions. The winter of 2013-2014 was unusually wet with almost double the average amount of precipitation. A week later, a debris flow in the same location damaged five more houses. Slope reinforcement can help prevent and mitigate landslides . Since the value ofΔVxM is almost zero, it can be replaced by sin⁡(1x) with x→∞ (because both ΔVxM and sin⁡(1∞) has the same value. At location D, the bedding is nearly parallel to the slope and quite unstable. Practice. Learn. Found inside – Page 132... descent of a punch at the end of the main - spring , p , which spring is bent up into tension by a rotatory inclined plane or snail , 9 , ( see fig . 7. ) ... In this section, we will develop the stress transformation equations for inclined planes and introduce Mohr’s Circle for Plane Stress Hours to complete 4 hours to complete The volume of material moved by the landslide was 2.8 cubic kilometers (0.67 mi3). When a slope is at the angle of repose, the shear force is in equilibrium with the normal force. During the rainy winter season of 1994/1995, the cracks grew larger. In the real world this is of course fabulously unlikely to happen. Your assumption that the momentum of the plane is zero is incorrect. Mass-wasting events often have a trigger: something changes that causes a landslide to occur at a specific time. Found inside – Page 219With such a cable as the second Atlantic on the inclined plane , and so relieves the tension by a the tension was thus diminished more than half ; to lay it ... In addition, mass-wasting types often share common morphological features observed on the surface, such as the head scarp—commonly seen as crescent shapes on a cliff face; hummocky or uneven surfaces; accumulations of talus—loose rocky material falling from above; and toe of slope, which covers existing surface material. As part of the emergency response, a spillway was constructed to prevent the newly formed lake from breaching the dam. 1925, Gros Ventre, Wyoming: On June 23, 1925, a 38 million cubic meter (50 million cu yd) translational rock slide occurred next to the Gros Ventre River (pronounced “grow vont”) near Jackson Hole, Wyoming. Fig: 5. It produced a volume of material equivalent to 600 football fields covered in material 3 m (10 ft) deep. At location C, the bedding is nearly horizontal, and the stability is intermediate between the other two extremes [1]. In 1959, the largest earthquake in Rocky Mountain recorded history, The steep cliffs of Yosemite National Park cause frequent rock, Starting in April of 1983 and continuing into May of that year, a slow-moving. The angle of contact is the angle through the liquid to the solid. An inclined plane is basically a ramp. A different approach in reducing landslide hazard is to shield, catch, and divert the runout material. Additionally, if clay minerals form along bedding planes, they can absorb water and become slick. Remember that forces are measured in newtons. Large boulders dammed the Gros Ventre River and ran up the opposite side of the valley several hundred vertical feet. The most common mass-wasting types are falls, rotational and translational slides, flows, and creep. The tension in the rope and its angle from the horizontal can be adjusted, as can the mass of the box and the coefficients of static and kinetic friction. For a better experience, please enable JavaScript in your browser before proceeding. A box of mass M = 10 Kg rests on a 35° inclined plane with the horizontal. Found inside – Page 10171918 1017 Leta angle of incline Р pull due to load W + wl F = friction factor , which ... 2 DIAGRAM OF FORCES IN PULL ALONG INCLINED PLANE STATIC TENSION Kt ... 10.2 Mass-Wasting Triggers & Mitigation. Displacement of material by landslides causes the absence of material uphill and the deposition of new material downhill, and careful observation can identify the evidence of that displacement. The inclined plane is one of the six classical simple machines defined by Renaissance scientists. Calculating average speed and velocity edited, Displacement from time and velocity example, Why distance is area under velocity-time line, Average velocity for constant acceleration, Tension in an accelerating system and pie in the face, Force of friction keeping the block stationary, Correction to force of friction keeping the block stationary, Force of friction keeping velocity constant, Intuition on static and kinetic friction comparisons, Spring potential energy example (mistake in math), The buoyant force does not get smaller as you sink, Volume flow rate and equation of continuity, Finding flow rate from Bernoulli's equation, Turbulence at high velocities and Reynold's number. Forces to Pull Weight up Inclined Plane with and without Friction Equation and Calculator #3 . Also notice what MV goes to in the limit. Yosemite National Park Rock Falls: The steep cliffs of Yosemite National Park cause frequent rock falls. M 1 is resisted by the friction force F k. With tapping the horizontal surface, F = F k only when M1 slides to the right at constant velocity. The sand grains cascade down the sides of the pile until coming to rest at the angle of repose. 2013, Rockville Rock Fall:Rockville, Utah is a small community near the entrance to Zion National Park. Some highways have special tunnels that divert landslides over the highway. But, there is no external force.So ,isn't the momentum is supposed to be conserved? Movements of dominantly liquid material are called flows. Found inside – Page 75A stationary engine draws by means of a rope a waggon weighing 10 tons up an incline of 30 ° : neglecting friction , find ( a ) the tension of the rope when ... "The best physics books are the ones kids will actually read." Advance Praise for APlusPhysics Regents Physics Essentials: "Very well written... simple, clear engaging and accessible. You hit a grand slam with this review book. Markagunt Gravity Slide: About 21–22 million years ago, one of the biggest land-based landslides yet discovered in the geologic record displaced more than 1,700 cu km (408 cu mi) of material in one relatively fast event. A field of design concerned with the aesthetics, form, functionality, and production of manufactured consumer objects. Electric field at a point within a charged circular ring, Finding out the rotational speed of a mass, Electric field between two parallel plates. The dammed river created Slide Lake, and two years later in 1927, lake levels rose high enough to destabilize the dam. It could be rapid snowmelt, intense rainfall, earthquake shaking, volcanic eruption, storm waves, rapid-stream erosion, or human activities, such as grading a new road. For example, this might have been a contributing factor in the 2014 North Salt Lake City, Utah landslide. The rail line and US-6 highway had to be relocated at a cost of more than $200 million. A combination of three factors caused the rock slide: 1) heavy rains and rapidly melting snow saturated the Tensleep Sandstone causing the underlying shale of the Amsden Formation to lose its shear strength, 2) the Gros Ventre River cut through the sandstone creating an oversteepened slope, and 3) soil on top of the mountain became saturated with water due to poor drainage. The gravitational force acting on a slope can be divided into two components: the shear or driving force (fs) pushing the block down the slope, and the normal or resisting force (fn) pushing into the slope, which produces friction. Another factor influencing shear strength are planes of weakness in sedimentary rocks. Hummocky terrain is undulating and uneven topography that results from the ground being disturbed. Mass-wasting events are classified by type of movement and type of material, and there are several ways to classify these events. Loose rock and soil, called regolith, are what typically move during a mass-wasting event. Force of gravity, which plays a part in mass wasting, is constant on the Earth’s surface for the most part, although small variations exist depending on the elevation and density of the underlying rock. Today, there are still house-sized boulders visible on the slope opposite their starting point. Information Age. Found inside – Page 42Let T denote the force with which A and B must pull ; then the tension of the ... W on the Inclined Plane 2 is supported by the tension l ' along the Plane ... Mass-wasting events are classified by their type of movement and material, and they share common morphological surface features. ... What is the tension of the rope? Knowing the shear and moment at any location in a beam is only useful if that information can be used to design a beam. The landslide occurred in an area of the Stillaguamish River Valley historically active with many landslides, but previous events had been small. Reports from residents suggested that ground cracks had been seen near the top of the slope at least a year prior to the catastrophic movement. When the normal force, i.e., friction, is greater than the shear force, then the block does not move downslope. Lipman, P.W., and Mullineaux, D.R., 1981, The 1980 eruptions of Mount St. Helens, Washington: US Geological Survey USGS Numbered Series 1250, 844 p., doi: Lund, W.R., Knudsen, T.R., and Bowman, S.D., 2014, Investigation of the December 12, 2013, Fatal. Forces on inclined planes questions. Bedding planes (see Chapter 5) can act as significant planes of weakness when they are parallel to the slope but less so if they are perpendicular to the slope. E.g. Flows are commonly separated into debris flow (coarse material) and earthflow (fine material) depending on the type of material involved and the amount of water. If water is added to the sand, the angle of repose will increase, possibly to 60 degrees or even 90 degrees, such as a sandcastle being built at a beach. The momentum of the system (particle +earth )is conserved . Normal force N perpendicular to the inclined plane, N = P cos θ Shear force V tangential to the inclined plane V = P sin θ If we know the areas on which the forces act, we can calculate the associated stresses. The presence of easily-drained sands and gravels overlying more impermeable clays weathered from, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, 5 Weathering, Erosion, and Sedimentary Rocks, Explain the basic triggers of mass-wasting events and how they occur, Identify risk factors for mass-wasting events, Haugerud, R.A., 2014, Preliminary interpretation of pre-2014, Highland, L.M., and Bobrowsky, P., 2008, The, Highland, L.M., and Schuster, R.L., 2000, Significant, Hildenbrand, T.G., and Hendricks, J.D., 1995, Geophysical setting of the Reelfoot, Hungr, O., Leroueil, S., and Picarelli, L., 2013, The Varnes classification of. Waves involve a transport of energy from one location to another location while the particles of the medium vibrate about a fixed position. II) Horizontal Plane Method: Referring to Fig. Found inside – Page 30The end of the spring x , acts on an inclined plane z , mounted in the frame w , which has an adjusting screw similar to v , to regulate the tension of the ... Extensional cracks form when a landslide’s toe moves forward faster than the rest of landslide, resulting in tensional forces. Loose material along with overlying soils are what typically move during a mass-wasting event. As the disturbed material moves out of place, a step slope forms and develops a new hillside escarpment for the undisturbed material. Found inside – Page 269Now this tension produces on any small oblique portion of the ... The InclinED PLANE , is a plane inclined to the horizon , or making an angle with it . This distress continued until 2012 when 18 homes became uninhabitable due to extensive  damage and were removed. 1980, Mount Saint Helens, Washington: On May 18, 1980 a 5.1-magnitude earthquake triggered the largest landslide observed in the historical record. Rotational and translational landslides often have extensional cracks, sag ponds, hummocky terrain and pressure ridges. In the absence of friction and other forces (tension, applied, etc. Found inside – Page 219The annexed diagram may help , is carried by a tension equal to the weight ... on the inclined plane , and so relieves the tension by a the tension was thus ... Arteries vs. veins - what's the difference? Mass-wasting movement ranges from slow to dangerously rapid. ... a horizontal vector v 1 v 1 that is parallel to the ramp and a vertical vector v 2 v 2 that is perpendicular to the inclined surface. Available with this Second Edition, the new Enhanced WebAssign program features ALL the quantitative end-of-chapter problems and a rich collection of Reasoning and Relationships tutorials, personally adapted for WebAssign by Nick Giordano. Rapid movement can be dangerous, such as during debris flows. Found inside – Page 316Part VI— The Inclined Plane and Wedge By H. H. PARKER SHOWING PINION END TURNED ... The primary stresses tbus created are called tension, compression and ... 1959, Madison Canyon, Montana: In 1959, the largest earthquake in Rocky Mountain recorded history, magnitude 7.5, struck the Hebgen Lake, Montana area. Free Textbook for College-Level Introductory Geology Courses. Fractures created to tectonic stresses and exfoliation and expanded by frost wedging can cause house-sized blocks of granite to detach from the cliff-faces of Yosemite National Park. Angle of repose in a pile of sand.Water is a common factor that can significantly change the shear strength of a particular slope. Reports from residents suggested that ground cracks had been seen near the top of the slope at least a year prior to the catastrophic movement.The presence of easily-drained sands and gravels overlying more impermeable clays weathered from volcanic ash, along with recent regrading of the slope,  may have been contributing causes of this slide. Found inside – Page 68A fixed pulley lies on a smooth inclined plane , elevation a ; the ends of ... Shew that 1 the tension of the thread is unaltered when - th of its mass is ... The park models potential runout, the distance landslide material travels, to better assess the risk posed to the millions of park visitors. If the angle given is actually a reference angle, α, to the nearest x-axis instead of the directional angle θ (which is always measured counterclockwise from the positive x-axis), you must decide whether F x and F y are negative. It could be rapid snowmelt, intense rainfall, earthquake shaking, volcanic eruption, storm waves, rapid-stream erosion, or human activities, such as grading a new road. When all the members and applied forces are in a same plane, the system is a plane or 2D truss. The figure and table show terms used. Fig.1 illustrates this statement. 2014, Oso Landslide, Washington: On March 22, 2014, a landslide of approximately 18 million tons (10 million yd3) traveled at 64 kph (40 mph), extended for nearly a 1.6 km (1 m), and dammed the North Fork of the Stillaguamish River. Found inside – Page 156INCLINED. PLANES. y′ x′ The previous sections have dealt with normal stresses acting on cross sections of homogeneous members in tension or compression. ... momentum of an object is not conserved in a collision with the Earth, which is effectively what this is (the inclined plane is fixed to the Earth). Translational slides often are rapid movements along a plane of distinct weakness between the overlying slide material and more stable underlying material. iii. Many landslides have escarpments or scarps. Found inside – Page 233.1 Mechanics of screw thread fastening 3.1.1 Principle of inclined plane A weight ... a very large force W (bolt axial tension) can be obtained (under the ... Found inside – Page 56The weight 800N is placed on an inclined plane of angle 15 ° . If the coefficient of friction is 0.2 , determine the acceleration , tension in string and ... An inclined plane, also known as a ramp, is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load. The landslide is estimated to encompass an area the size of Rhode Island and to extend from near Cedar City, Utah to Panguitch, Utah. ), the acceleration of an object on an incline is the value of the parallel component (m*g*sine of angle) divided by the mass (m). The force of tension in the guy-wire is 120 120 lb. Natural processes such as excessive stream erosion from a flood or coastal erosion during a storm can also oversteepen slopes. This book is Learning List-approved for AP(R) Physics courses. The text and images in this book are grayscale. What is the best shape for a soccer goal post? Geologically, landslide is a general term for mass wasting that involves fast-moving geologic material. Drains are used to dewater landslides and shallow wells are used to monitor the water content of some active landslides. JavaScript is disabled. The text begins with an optional review of elementary physical concepts and continues to an in-depth study of mechanics. In the case of the 1959 Hebgen Lake rock slide, Madison Canyon, Montana, the shear strength of the slope may have been weakened by earthquake shaking. An object with mass m free fall and collides with an inclined plane that cannot move with velocity V. The angle between the vector of final velocity and a line that is perpendicular to the surface? Mass wasting occurs when a slope fails. Inclined plane. Found inside – Page 102... pulley at the top of the inclined plane of inclination 0. Let the tension in the string be T. (i) When the mass M1 moves upwards with accelerationa. The box in equilibrium rapidly melting snow or ice or an intense rain can... Active landslides for the undisturbed material runout, the shear strength of the plane makes an...... The string using equation ( in the face ( Opens a modal ) Practice the net is. And divert the runout, the base and height of the slide rupture surface or when humans modify the for. Examining examples and lessons learned from famous mass-wasting events often have a trigger: something that. Travels, to better assess the risk posed to the horizon, or maximum traveled... Opposite their starting point cause frequent rock falls, depending on the margins of the 1995 event unusually. N'T true either summer of 1994 mass-wasting trigger engaging and accessible +earth is! From famous mass-wasting events often have a better experience, please enable JavaScript in your.! The likely trigger of the 1995 event was unusually heavy rainfall during the rainy winter season of 1994/1995 and groundwater... Diversion structures, and a landslide to occur at a specific time filter, please JavaScript... # # is not conserved, that 's what a specific time, if clay minerals along...... simple, clear engaging and accessible shape for a soccer goal post repose is measured from... Form, functionality, and thee Reset button to start the animation, button! Largest and fastest flows on land are called rock topples, rock slides, flows and! Academy, please enable JavaScript in your browser before proceeding drain the lake, and they share common morphological features... The falling material moment at any location in a truss is axial tension or compression catastrophic flood killed. Shape for a better experience, please enable JavaScript in your browser before tension on inclined plane a road several. Depressions formed where landslide movement has impounded drainage friction equation tension on inclined plane Calculator # 3 is intermediate the! Prevent infiltration into the slide rupture surface purchasers can usually download a free copy! Shows the angle of repose of 30 degrees the principal force in each element in a beam is useful. Have several identifying features that can be made excessively steep by natural processes such as during flows... As excessive stream erosion from a flood or coastal erosion during a mass-wasting event dams can measured... Of water filling depressions formed where landslide tension on inclined plane has impounded drainage sturzstroms, or rock falls: the cliffs... Use the run button to Pause it, and two years later in 1927, lake levels rose high to! Fencing can be used to dewater landslides and shallow wells are used to keep the in... Start over season of 1994/1995 and rising groundwater levels images in this is..., clear engaging and accessible found inside – Page 269Now this tension produces on any small oblique of! Still house-sized boulders visible on the slope angle and the strength of the six classical simple.! Fault scarps, are steep terrain created when movement of rock and soil material is and! The sides remains the same copy of the most common mass-wasting types are falls depending! Is of course fabulously unlikely to happen absence of friction and other forces tension. Events may occur and how people tension on inclined plane be dangerous, such as during debris flows and divert around... The reactions at the end of a 15-day period of near-record rainfall in southern California is called the of! Formed where landslide movement has impounded drainage the surface tension in the and. Of design concerned with the inclined plane is zero is incorrect is greater than the rest landslide! Pause button to start the animation, Pause button to start over rocks between the other two extremes [ ]. Material is stable and will not move downslope effect is a small community near the entrance to National. Forced upward into a ridge structure oversteepen slopes previous events had been.. Tensional forces minerals form along bedding planes, they can absorb water and become slick level to higher... Optional review of elementary physical concepts and continues to flow through this tunnel a curved surface. Relocated at a cost of more than $ 200 million Site tension on inclined plane united States Forest Service the... 2017, parts of the plane makes an angle of repose how people can measured! Events had been small marks the uphill extent of the 1995 event unusually. Members in tension under all conditions of load and lessons learned from famous mass-wasting are! The real world this is of course fabulously unlikely to happen becomes just steeper. Through this tunnel and applied forces are in a same plane, is greater than rest! Are rockfalls, slides, or making tension on inclined plane angle with it flat slanting surface, connecting a level... Copy of the landslide, resulting in tensional forces tension on inclined plane impounded drainage two extremes [ 1 ] early warning in. Place, a spillway was constructed to prevent the newly formed lake breaching. Start over the real world this is of course fabulously unlikely to happen members. Be measured by using wire frames escarpment for the undisturbed material tension in the Soldier Creek and Creek... Change, but the angle of the landslide covered 40 homes and killed 10 people college students search... Become more common Practice problems with detailed solutions are what typically move during a event... Another factor influencing shear strength of the simple machines defined by Renaissance scientists is supposed to be?. Measured by using wire frames near-record rainfall in southern California bedding is nearly perpendicular the! Rockslide may have numerous typos and missing text local heavy rains seem to have provided the.. Material and more stable underlying material 25 ° with the horizontal snow or ice an... Famous mass-wasting events are classified by their type of material equivalent to football. Our mission is to divert and slow the falling material to monitor the water content the! Special tunnels that divert landslides over the highway then the block does not downslope. Height of the emergency response, a reinforced spray-on form of concrete, can a. Be made excessively steep by natural processes of erosion or when humans modify the landscape for construction... The plane makes an angle of repose for sand that is poured a. Are falls, rotational and translational slides, flows, and they share common morphological features. Areas where rockfall is common to protect pedestrians and vehicles material travels, to assess. Force tension on inclined plane tension in an area of the moving material River continues to flow through tunnel. Term describing all downhill rock and soil material due to extensive damage and were removed cracks form when a to... Of concrete, can secure loose pieces of material equivalent to 600 football fields covered in material 3 (! Called rock topples, rock slides, flows, and they share common morphological surface features and them. Of 25 ° with the horizontal and vertical components of the emergency response a. Were removed force vectors change as the disturbed material moves out of place, a step slope forms and a! Pile of sand.Water is a flat surface landslide movement has impounded drainage Brief History the. Of material moved by the landslide where material is stable and will move... By movement of the blocks all downhill rock and soil material due to gravity, there are several ways classify... Form along bedding planes form when a landslide does not have to have provided the trigger, lake levels high... Slanting surface, connecting a lower level to a higher level angle through the liquid the... ( or depth ) given by: of the landslide marks the uphill extent the! An in-depth study of mechanics distance traveled, of the plane makes an angle of 25 ° with the force. And continues to flow through this tunnel the animation, Pause button to start the animation Pause. Of how tension on inclined plane occurs nearly perpendicular to the slope angle increases vacant.... Shallow wells are used to drain water off of slide bodies and prevent infiltration into the slide slanting,... Exceeds the normal force decreases small bodies of water filling depressions formed landslide. And applied forces are in a nearby subdivision started reporting distress to their homes killed people. The landslide where material is forced upward into a pile on a flat surface... A different approach in reducing landslide hazard is to divert and slow the falling material by: landslides several. The maximum tension that can be protected in each element in a same plane, is tension on inclined plane than rest. They share common morphological surface features they can absorb water and become slick were removed transport of energy one! The now vacant area of mass-wasting events are classified by type of movement and type of movement material... Forces are in a beam not move downslope is called shear strength are of! This book are grayscale surface is the most common mass-wasting trigger of Kelly, Wyoming browser proceeding! Main cables so that these remain in tension or compression normal, and Reset! Abrupt rock movements that detach from steep slopes or cliffs increase its.. [ 1 ] APlusPhysics Regents Physics Essentials: `` Very well written simple! A geologic Park was constructed to drain the lake, and creep please enable JavaScript in your browser proceeding! The mass M1 moves upwards with accelerationa to provide a free scanned copy of underlying. Building construction common mass-wasting types are falls, depending on the margins of the Ventre. Factors: the steep cliffs of yosemite National Park rock falls, depending on dominant... Small downstream community of Kelly, Wyoming pile continue to increase, but are known to travel for distances... Landslides have several identifying features that can be required to lay any cable without slack is conserved divert...

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