1. An Olympic athlete competing in the hammer toss spins the 7.26 kg hammer in a circle having a radius of 2.15 m (this includes both the length of the massless cable attached to the hammer and the athlete's arms). If the angular speed of the hammer is 13.4 rad/s about the axis of rotation just before the athlete releases the hammer, what is the tension force in the cable attached to the hammer at this moment? Treat the hammer like it is a point mass at the end of a massless cable. 2. Your car has a mass of 1.30 x 103 kg. You get on Crondall Lane and are cruising along at 20.0 m/s and thinking about how you really should have walked across the bridge instead of contributing to global pollution. You look up to see that you are approaching the stoplight at Owings Mills Boulevard and it is red, so you slam on the brakes when you are 25.0 m away from the light. If your brakes provide a constant force of 8.90 x 103 N, do you stop before reaching the stoplight? If not, how fast are you moving when you pass the stoplight? Use the Work-Energy Theorem to solve these questions. 3. A 72.0 kg bungee jumper stands on a bridge a height of 34.0 m above a river. He is tied to a bungee cord that has an unstretched length of 25.0 m. Determine the required spring constant of the bungee cord for the jumper to just touch the surface of the river at the bottom of his fall. MacBook Air
1. An Olympic athlete competing in the hammer toss spins the 7.26 kg hammer in a circle having a radius of 2.15 m (this includes both the length of the massless cable attached to the hammer and the athlete's arms). If the angular speed of the hammer is 13.4 rad/s about the axis of rotation just before the athlete releases the hammer, what is the tension force in the cable attached to the hammer at this moment? Treat the hammer like it is a point mass at the end of a massless cable. 2. Your car has a mass of 1.30 x 103 kg. You get on Crondall Lane and are cruising along at 20.0 m/s and thinking about how you really should have walked across the bridge instead of contributing to global pollution. You look up to see that you are approaching the stoplight at Owings Mills Boulevard and it is red, so you slam on the brakes when you are 25.0 m away from the light. If your brakes provide a constant force of 8.90 x 103 N, do you stop before reaching the stoplight? If not, how fast are you moving when you pass the stoplight? Use the Work-Energy Theorem to solve these questions. 3. A 72.0 kg bungee jumper stands on a bridge a height of 34.0 m above a river. He is tied to a bungee cord that has an unstretched length of 25.0 m. Determine the required spring constant of the bungee cord for the jumper to just touch the surface of the river at the bottom of his fall. MacBook Air
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter8: Rotational Equilibrium And Dynamics
Section: Chapter Questions
Problem 39P: A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a...
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Transcribed Image Text:1. An Olympic athlete competing in the hammer toss spins the 7.26 kg hammer in a
circle having a radius of 2.15 m (this includes both the length of the massless cable
attached to the hammer and the athlete's arms). If the angular speed of the hammer
is 13.4 rad/s about the axis of rotation just before the athlete releases the hammer,
what is the tension force in the cable attached to the hammer at this moment? Treat
the hammer like it is a point mass at the end of a massless cable.
2. Your car has a mass of 1.30 x 103 kg. You get on Crondall Lane and are cruising
along at 20.0 m/s and thinking about how you really should have walked across the
bridge instead of contributing to global pollution. You look up to see that you are
approaching the stoplight at Owings Mills Boulevard and it is red, so you slam on the
brakes when you are 25.0 m away from the light. If your brakes provide a constant
force of 8.90 x 103 N, do you stop before reaching the stoplight? If not, how fast are you
moving when you pass the stoplight? Use the Work-Energy Theorem to solve these
questions.
3. A 72.0 kg bungee jumper stands on a bridge a height of 34.0 m above a river. He is tied
to a bungee cord that has an unstretched length of 25.0 m. Determine the required
spring constant of the bungee cord for the jumper to just touch the surface of the river
at the bottom of his fall.
MacBook Air
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