COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 8, Problem 6QAP
To determine
To Explain:
The torque wrench and discuss any difficulties that a Canadian auto or bicycle mechanic might have working with an American mechanic's tools.
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Chapter 8 Solutions
COLLEGE PHYSICS
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- A popular make of dental drill canoperate at a speed of 42,500 rpm while producing a torque of3.68 oz # in. What is the power output of this drill? Give youranswer in watts.arrow_forward(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 65 kg CG Freaction 0.86 m 1.44 m (b) How much work (in J) does she do if her center of mass rises 0.260 m? (c) What is her useful power output (in W) if she does 21 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) Warrow_forward(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 62 kg CG w Freaction 0.87 m 1.45 m N (b) How much work (in J) does she do if her center of mass rises 0.180 m? (c) What is her useful power output (in Ww) if she does 27 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.)arrow_forward
- (a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 47 kg CG Fe reaction 0.85 m 1.42 m N (b) How much work (in J) does she do if her center of mass rises 0.220 m? (c) What is her useful power output (in W) if she does 24 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.)arrow_forwardRotational Work and Kinetic Energy Show the complete solution. 1. A wrench is rotated through 5 revolutions making a torque of 10 Nm and beingstopped by a hand after 20 s. (a) How much work is done by the torque to stop therotating wrench? (b) How much power is done by your hand that provided thetorque? 2. A rotating stool chair produces a torque of 20 Nm. When it stopped after 10 s ofcompleting 8 revolutions, (a) how much work is done by the torque to stop therotating wrench? (b) How much power is done by your hand that provided thetorque?arrow_forwardStart answering here: 1. A wrench is rotated through 5 revolutions making a torque of 10 Nm and being stopped by a hand after 20 s. (a) How much work is done by the torque to stop the rotating wrench? (b) How much power is done by your hand that provided the torque? 2. A rotating stool chair produces a torque of 20 Nm. When it stopped after 10 s of completing 8 revolutions, (a) how much work is done by the torque to stop the rotating wrench? (b) How much power is done by your hand that provided the torque?arrow_forward
- After all the excitement of rescuing the constitution, you decide to go for a relaxing bike ride to wind down. Your bike is an antique, left to you by your great, great, grandfather, pictured below. This bike has no gears, so the number of times you turn the petals in the number of times the weels rotate. Assume the front wheel has a radius of 0.5 m, and the back wheel has a radius of 0.2 m. You begin your bike ride with an angular acceleration of 5 rad/s^2 for the front (big) wheel. How long until the bike is traveling at 10 m/s (note: the speed of the bike relative to the road is the same as the speed of the outer edge of the wheel relative to the center)? You then ride at a constant speed for 10 minutes. How many rotations does the big wheel make? How about the little one? Draw a picture of set up with relevant values labeled with variable names. Draw velocities vs time graphs (this time, angular velocity).arrow_forwardPlease provide a solution for each way of approaching the problem. So a solution for “Forces and torques”, for “Newton’s second law of rotation”, and for “Energy”. Thank youarrow_forward11. A 20N force is applied at the end of a wrench that is 40 cm. in length. The force is applied at an angle of 60o to the wrench. Calculate the magnitude of the torque about the point of rotation M. The answer here is 6.93J. Please give processes.arrow_forward
- (a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 68 kg CG Fre reaction 0.85 m 1.41 m N (b) How much work (in J) does she do if her center of mass rises 0.220 m? (c) What is her useful power output (in W) if she does 15 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) Warrow_forwardIn opening a door, a 49.3 N force is applied as shown in the figure below. Find the torque produced by this force with respect to point O. (Let r = 0.815 m and 0 = 57.5.) Magnitude?arrow_forward(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) N 0.88 m m = 56 kg CG W 1.46 m W Freaction (b) How much work (in J) does she do if her center of mass rises 0.180 m? (c) What is her useful power output (in W) if she does 24 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.)arrow_forward
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