23.0 kg child plays on a swing having support opes that are 1.80 m long. A friend pulls her back until the ropes are 41.0° from the vertical and eleases her from rest. You may want to review (Page). for related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Calculating speed along a vertical circle. Part A What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing? U= Submit Part B V = Π| ΑΣΦ How fast will she be moving at the bottom of the swing? Request Answer Submit 195| ΑΣΦ Request Answer ? ? J m/s

23.0 kg child plays on a swing having support opes that are 1.80 m long. A friend pulls her back until the ropes are 41.0° from the vertical and eleases her from rest. You may want to review (Page). for related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Calculating speed along a vertical circle. Part A What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing? U= Submit Part B V = Π| ΑΣΦ How fast will she be moving at the bottom of the swing? Request Answer Submit 195| ΑΣΦ Request Answer ? ? J m/s

Name: pq.9 A 23.0 kg child plays on a swing having supportropes that are 1.8
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Description: pq.9 A 23.0 kg child plays on a swing having supportropes that are 1.80 m long. A friend pulls her backuntil the ropes are 41.0° from the vertical andreleases her from rest.You may want to review (Page).For related problem-solving tips and strategies

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter5: Energy

Section: Chapter Questions

Problem 22P: A 60.0-kg athlete leaps straight up into the air from a trampoline with an initial speed of 9.0 m/s....

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(a) How long will it take an 850-kg car with a useful power output of 40.0 hp (1hp=746W) to reach a speed of 15.0 m/s, neglecting friction? (b) How long will this acceleration take if the car also climbs a 3.00-m-high hill in the process?
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In an iconic movie scene, Forrest Gump (https://openstaxcollege.org/l/21ForrGumpvid) runs around the country. If he is running at a constant speed of 3 m/s, would it take him more or less energy to run uphill or downhill and why?
An 8.0-g bullet has a speed of 800 m/s. (a) What is its kinetic energy? (b) What is its kinetic energy if the speed is halved?
A 200-g steel ball is tied to a 2.00m “massless” string and hung from the ceiling to make a pendulum, and then, the ball is brought to a position making a 30 angle with the vertical direction and released from rest. Ignoring the effects of the air resistance, find the speed of the ball when the string (a) is vertically down, (b) makes an angle of 20 with the vertical and (c) makes an angle of 10 with the vertical.
Grains from a hopper falls at a rate of 10 kg/s vertically onto a conveyor belt that is moving horizontally at a constant speed of 2 m/s. (a) What force Is needed to keep the conveyor belt moving at the constant velocity? (b) What is the minimum power of the motor driving the conveyor belt?
A roller-coaster car shown in Figure P7.82 is released from rest from a height h and then moves freely with negligible friction. The roller-coaster track includes a circular loop of radius R in a vertical plane. (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 in terms of R. (b) Now assume the release point is at or above the minimum required height. Show that the normal force on the car at the bottom of the loop exceeds the normal force at the top of the loop by six times the cars weight. The normal force on each rider follows the same rule. Such a large normal force is dangerous and very uncomfortable for the riders. Roller coasters are therefore not built with circular loops in vertical planes. Figure P5.22 (page 149) shows an actual design.
Jane, whose mass is 50.0 kg, needs to swing across a river (having width D) filled with person-eating crocodiles to save Tarzan from danger. She must swing into a wind exerting constant horizontal force F, on a vine having length L and initially making an angle with the vertical (Fig. P7.81). Take D = 50.0 m, F = 110 N, L = 40.0 m, and = 50.0. (a) With what minimum speed must Jane begin her swing to just make it to the other side? (b) Once the rescue is complete, Tarzan and Jane must swing back across the river. With what minimum speed must they begin their swing? Assume Tarzan has a mass of 80.0 kg.
. A compact car can climb a hill in 10 s. The top of the hill is 30 in higher than the bottom, and the car’s mass is 1,000 kg. What is the power output of the car?
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