A61 kg sprinter, starting from rest, runs 41 m in 7.0s at constant acceleration. What is the magnitude of the horizontal force acting on the sprinter? Express your answer with the appropriate units. > View Available Hint(s) HẢ F = Value Units Submit Part B What is the sprinter's power output at 2.0 s, 4.0 s, and 6.0 s? Express your answers in kilowatts separated by commas.

A61 kg sprinter, starting from rest, runs 41 m in 7.0s at constant acceleration. What is the magnitude of the horizontal force acting on the sprinter? Express your answer with the appropriate units. > View Available Hint(s) HẢ F = Value Units Submit Part B What is the sprinter's power output at 2.0 s, 4.0 s, and 6.0 s? Express your answers in kilowatts separated by commas.

Name: Part a,b please Problem 9.40entsI ReviewndPart AA61 kg sprinter, start
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Description: Part a,b please Problem 9.40entsI ReviewndPart AA61 kg sprinter, starting from rest, runs 41 m in7.0 s at constant acceleration.What is the magnitude of the horizontal force acting on the sprinter?Express your answer with the appropriate units.> View

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter7: Energy Of A System

Section: Chapter Questions

Problem 7.15OQ: A cart is set rolling across a level table, al the same speed on every trial. If it runs into a...

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A cart is set rolling across a level table, at the same speed on every trial. If it runs into a patch of sand, the cart exerts on the sand an average horizontal force of 6 N and travels a distance of 6 cm through the sand as it comes to a stop. It instead the cart runs into a patch of gravel on which the can exerts an average horizontal force of 9 N, how far into the gravel will the cart roll before stopping? (a) 9 cm (b) 6 cm (c) 4 cm (d) 3 cm (e) none of those answers
Review. A force platform is a tool used to analyze the performance of athletes by measuring the vertical force the athlete exerts on the ground as a function of time. Starting from rest, a 65.0-kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact with the platform during the time interval 0t 0.800 s, the force she exerts on it is described by the function F = 9 200t 11 500 t2 where F is in newtons and t is in seconds. (a) What impulse did the athlete receive from the platform? (b) With what speed did she reach the platform? (c) With what speed did she leave it? (d) To what height did she jump upon leaving the platform?
Jane needs to swing across a river filled with man-eating crocodiles in order to rescue Tarzan from danger. However, she must swing into a constant horizontal wind force, F, on a vine that is initially at an angle of ? with the vertical (see Fig. P5.73). Use these values to solve the problem: Jane's mass = 49.0 kg, Tarzan's mass = 80.0 kg, D = 50 m, F = 140 N, L = 40 m, ? = 24.6, and ? = 56.5°. With what minimum speed must Jane begin her swing in order to just make it to the other side? If she can make it to the other side with zero initial speed, what is her final speed (enter this value with a negative sign)?______ m/s Once the rescue is complete, Tarzan and Jane must swing back across the river. With what minimum speed must they begin their swing? If they can make it to the other side with zero initial speed, what is their final speed (enter this value with a negative sign)?______ m/s
Suppose the mass of a fully loaded module in which astronauts take off from the Moon is 1.25 x 10° kg. The thrust of its engines is 3.00 x 10% N. (a) Calculate the module's magnitude of acceleration in a vertical takeoff from the Moon. (b) Could it lift off from Earth? If not, why not? If it could, calculate the magnitude of its acceleration. Show all work
A 800 kg car is traveling down a highway at 13.0 m/s when the driver notices a turtle in the middle of the road. Not wanting to strike the turtle, the driver applies her brakes, and her car skids to a stop in 18.0 m. To the nearest newton, what net force must act on the car? Hint: there are more than one way you could go about solving this problem.
Suppose you use an ideal pulley of the type shown in Figure 5.18(c) to support a car engine of mass 130 kg. (a) What would the tension in the rope be? (b) What force must the ceiling supply, assuming you pull straight up on the rope?
Figure P5.41 shows the speed of a persons body as he does a chin-up. Assume the motion is vertical and the mass of the persons both is 64.0 kg. Determine the force exerted by the chin-up bar on his body at (a) t = 0, (b) t = 0.5 s, (c) t = 1.1 s, and (d) t = 1.6 s.
A particle moves in a medium under the influence of a retarding force equal to mk(υ3+ a2υ), where k and a are constants. Show that for any value of the initial speed the particle will never move a distance greater than π/2kaand that the particle comes to rest only for t → ∞.
A cart is set rolling across a level table, al the same speed on every trial. If it runs into a patch of sand, the cart exerts on the sand an average horizontal force of 6 N and travels a distance of 6 cm through the sand as it comes to a stop. If instead the cart runs into a patch of Hour, it rolls an average of 18 cm before stopping. What is the average magnitude of the horizontal force the cart exerts on the flour? (a) 2 N (b) 3 N (c) 6 N (d) 18 N (e) none of those answers
Calculate the force needed to bring a 1050 KG car to rest from a speed of 90.0 KM/H in a distance of 120 m (A fairly typical distance for a non-panic stop) n ? part (b ) we suppose instead the car it's a concrete abutment at full speed and is brought to a stop in 2.00 m . Calculate the force exerted on the car and compare it with the force found in part (a) , I.e. find the ratio of the force in part (b) to the force in part (a) . (force in part (b) /force in part (a) )?
During an Olympic 100-m sprint race, Usain Bolt, the world record holder in that race, quickly accelerates to his top speed of 12.4 m/s. Analysis of his technique has shown that each of his feet makes contact with the ground for 0.0800 s, exerting a force of magnitude 2.80 ✕ 103 N during this contact. This allows the 94.0 kg Bolt to leap forward and remain airborne for 0.120 s until the next foot touches the ground. (Ignore air resistance.) a) What are the magnitudes of the horizontal and vertical components of the force (in N) Bolt's feet exert on the ground? (Round your answers to at least three significant figures.) Horizontal = Vertical = b) Assuming that the sprinter accelerates at a constant rate while his feet are in contact with the ground and does not slow down when he is airborne, by what amount does Bolt's horizontal speed (in m/s) increase with each step? (Round your answer to at least three significant figures.) c) Assuming that the sprinter's speed increases at a…
Suppose you use an ideal pulley of the type shown in Figure 5.18(c) to support a car engine of mass 115 kg. (a) What would the tension in the rope be?N(b) What force must the ceiling supply, assuming you pull straight up on the rope? The pulley system's mass is 6.00 kg.N (upward)