Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 7, Problem 20P
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79. ssm A student is skateboarding down a ramp that is 6.0 m long and
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Chapter 7 Solutions
Physics Fundamentals
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- A 40 kg skier starts from rest at a height of H = 19 m above the end of the ski-jump ramp. As the skier leaves the ramp, his velocity makes an angle of 27° with the horizontal. Neglect the effects of air resistance and assume the ramp is frictionless. End of H ramp (a) What is the maximum height h of his jump above the end of the ramp? (b) If he increased his weight by putting on a backpack, would h then be greater, less, or the same? greater less the samearrow_forwardA skier weighing 600 N goes over a frictionless circular hill of radius R 20 m ). Assume that the effects of air resistance on the skier are negligible. As she comes up the hill, her speed is 8.0 m/s at point B, at angle u= 20. (a) What is her speed at the hilltop (point A) if she coasts without using her poles? (b) What minimum speed can she have at B and still coast to the hilltop? (c) Do the answers to these two questions increase, decrease, or remain the same if the skier weighs 700 N instead of 600 N?arrow_forwardThe skateboarder in the drawing starts down the left side of the ramp with an initial speed of 4.9 m/s. Neglect nonconservative forces, such as friction and air resistance, and find the height h of the highest point reached by the skateboarder on the right side of the ramp. ✔ < iarrow_forward
- A mass m is placed at a height of h from the ground on a wedge . ( u coefficent of friction = 0 for mass and wedge , the mass moves down the wedge and travels at a distance of 20 m , u = 0.6 between ground and mass . Calculate the height h.arrow_forwardUsing Gram-Schmidt algorithm, check for linear independence of the following vectors: v= (1, -2, 1, -1), v2= (1, 1, 3, -1), and v3= (-3, 7, 1, 3).arrow_forward38. GO The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. Neglect nonconservative forces, such as friction and air resistance, and find the height h of the highest point reached by the skateboarder on the right side of the ramp.arrow_forward
- A ski jumper starts from rest 47.5 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 11.0 m above the ground. Neglect air resistance. (a) What is her speed when she leaves the track? (b) What is the maximum altitude she attains after leaving the track? (c) Where does she land relative to the end of the track?arrow_forwardA skier starts from rest and slides 50m down a slope that makes an angle of 30 degrees with the horizontal. She then continues sliding on level snow. (a) If the coefficient of friction between skis and snow is 0.15 and air resistance is neglected, what is the speed of the skier at the foot of the slope? (b) How far away from the foot of the slope does she come to a stop?arrow_forwardA horizontal spring is compressed a specific distance by a small particle A and then particle A is released, moves horizontally, and then goes up a hill until it stops at a height of 2.00 m. The spring is then compressed the same distance by a small particle B and then particle B is released, moves horizontally along the same path as particle A, and then goes up the same hill until it stops. Calculate the final height reached by particle B. It is given that particle B has three times the mass of particle A. Assume there is no friction.arrow_forward
- The base vectors of the A axes set are Xa = [1 0 0] ', Ya = [0 1 0]' and Za = [0 0 1] 'and the base vectors of the B axes set are Xb = [0 1 0]', Yb = [- Let 1 0 0] 'and Zb = [0 0 1]'. Let the speed of the origin of the B axis set relative to the A axis set be [5 0 0] meters / second. If the representation of the linear velocity in the B axis set of a robot arm with a fixed orientation on the B axis set is [2 0 0] 'meter / second, what is the representation of the same robot arm's velocity in the A axis set on the A axis set?arrow_forwardA skier leaves a ski jump at 15.0 m/s at some angle. At what speed is he traveling at his maximum height of 4.50 m above the level of the end of the ski jump? (Neglect air friction.)arrow_forwardThe drawing shows a skateboarder moving at 6.80 m/s along a horizontal section of a track that is slanted upward by 0 = 41.0° above the horizontal at its end, which is 0.780 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction and air resistance, find the maximum height H to which she rises above the end of the track. 6.80m/s 0.780marrow_forward
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