In the sport of skeleton a participant jumps onto a sled (known as a skeleton) and proceeds to slide down an icy track, belly down and head first. The track has sixteen turns and drops 123 m in elevation from top to bottom. (© Frank Gunn/AP/Wide World Photos) (a) In the absence of nonconservative forces, such as friction and air resistance, what would be the speed of a rider at the bottom of the track? Assume that the speed at the beginning of the run is relatively small and can be ignored. 49.0 m/s (b) In reality, the best riders reach the bottom with a speed of 35.8 m/s (about 91 mi/h). How much work is done on a rider and his sled (assuming a total mass of 85.9-kg) by nonconservative forces? -4.48 X J

In the sport of skeleton a participant jumps onto a sled (known as a skeleton) and proceeds to slide down an icy track, belly down and head first. The track has sixteen turns and drops 123 m in elevation from top to bottom. (© Frank Gunn/AP/Wide World Photos) (a) In the absence of nonconservative forces, such as friction and air resistance, what would be the speed of a rider at the bottom of the track? Assume that the speed at the beginning of the run is relatively small and can be ignored. 49.0 m/s (b) In reality, the best riders reach the bottom with a speed of 35.8 m/s (about 91 mi/h). How much work is done on a rider and his sled (assuming a total mass of 85.9-kg) by nonconservative forces? -4.48 X J

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

A child of mass m = 16 kg slides down a slide of height h = 2.7 m without friction. Let gravitational potential energy be zero at ground level. a)Write an expression for the child's total mechanical energy, E, at the top of the slide, in terms of the variables in the problem and the acceleration due to gravity g. b)Calculate the change in the child's potential energy, ΔU in joules, from the top to the bottom of the slide at ground level (i.e. ΔU = Uground - Utop). c)What is the child's final speed, vf in m/s?
You push on a box of 10kg with a force F = (20i −10j )N. It moves on a rough surface (uc = 0.1) over 2 m. The crate is initially stationary. Can you calculate the speed of the crate after 2 m, using the kinetic energy theorem?
A child of mass m = 27 kg slides down a slide of height h = 2.1 m without friction. Let gravitational potential energy be zero at ground level. Write an expression for the child's total mechanical energy, E, at the top of the slide, in terms of the variables in the problem and the acceleration due to gravity g. Calculate the change in the child's potential energy, ΔU in joules, from the top to the bottom of the slide at ground level (i.e. ΔU = Uground- Utop). What is the child's final speed, vf in m/s?
The Huascaran mountain is a highly dangerous mountain, given that there are large rocks on the ice, at melting temperature the ice yields on the weight of the rocks and it slides down the ice hill, as shown in the figure, consider the rock It has a mass of 120kg, starting from point A with an initial speed of 10.0 m / s. There is no friction between points A and B, but on the flat ground at the base between B and the wall. After entering the rough region, the stone traverses the flat ground and the coefficient of friction between the stone and the horizontal ground is 0.50. Determine the distance you will travel before stopping.
As shown in the figure, a roller-coaster track includes a circular loop of radius R in a vertical plane. A car of mass m is released from rest at a height h above the bottom of the circular section and then moves freely along the track with negligible energy loss due to friction. (a) First suppose the car barely makes it around the loop; at the top of the loop, the riders are upside down and feel weightless. Find the required height h of the release point above the bottom of the loop. (Use any variable or symbol stated above along with the following as necessary: g.) h = (b) If the car is released at some point above the minimum required height, determine the amount by which the normal force on the car at the bottom of the loop exceeds the normal force on the car at the top of the loop. (Consider the moments when the car reaches the top and when it reaches the bottom again. Use any variable or symbol stated above along with the following as necessary: g.) NB - N- = The normal force on…
A daredevil on a motorcycle leaves the end of a ramp with a speed of 29.0 m/s as in the figure below. If his speed is 27.3 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
A 3.2 kg sloth hangs 3.0 m above the ground. (a) What is the gravitational potential energy of the sloth–Earth system if we take the reference point y 0 to be at the ground? If the sloth drops to the ground and air drag on it is assumed to be negligible, what are the (b) kinetic energy and (c) speed of the sloth just before it reaches the ground?
A skier starts at the top of a frictionless slope and pushes off with a speed of 3.0 m/s. The elevation of the slope is 40 m. She skis down the slope to a valley with elevation 0.0 m and then glides to the peak of an adjacent slope that is at an elevation of 25 m. Calculate her speed at the second peak
A motorcyclist drives up a 3.1-meter tall ramp and leaves the ramp with a speed of 42.5 m/s. If his speed is 37.8 m/s when he reaches the peak of his path, what is the maximum height (in m) above ground that he reaches? (Use energy, not kinematic equations.)
A force of 16 N is applied to a 4.5 kg object (initially at rest) for a time of 5.6 s. What is the speed of the object afterwards? Assume a level, frictionless surface.
A snowboarder with a mass of 98kg is initially stationary on a hilltop, then slides down on the snowy incline with a kinetic friction coefficient of 0.030 between tl snowboard and the surface. The hill has an approximate angle of elevation equal to 38° from the horizontal and an uphill wind hits him with a force of 0.80N. If the hill is 120m high, what is the speed of the snowboarder as he reaches the ground level? O 48m/s O 34m/s O 42m/s O 30m/s
A parachutist weighing m=70Kg (including equipment) falls vertically from a height of 1500 meters and opens the parachute after 10s of free fall. Suppose the coefficient of friction is 5kg/s when the parachute is closed and 100kg/s when the parachute is open. Find the speed of the skydiver when the parachute opens.