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Problems with solutions

I.D Level Problem Problem Topic
153 High school Find the tension in the rope and the force a 52.0 kg mountain climber must exert with her feet on the vertical rock face to remain stationary . Assume that the force is exerted parallel to her legs . Assume negligible force exerted by her arms . . . . continues
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Force & Laws of Motion
154 High school It is sometime said that water is removed from clothes in a spin dryer by centrifugal force throwing the water outward . Is this correct ? . . . continues
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Force & Laws of Motion
155 High school Suppose a car moves at constant speed along a mountain road . At what places does it exert the greatest and least forces on the road :

(a) at the top of the hill

(b) at a dip between two hills

(c) On a level stretch near the bottom of a hill ?

. . . continues
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Force & Laws of Motion
156 High school A bucket of water can be whirled in a vertical circle without the water spilling out , even at the top of the circle when the bucket is upside down . Explain . . . . continues
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Force & Laws of Motion
157 High school A rocket engine has the following thrust curve in pounds:

Time / Thrust: 0.13 second 99.061 pounds

Time / Thrust: 0.38 112.202

Time / Thrust: 0.63 118.164

Time / Thrust: 0.88 continues
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Force & Laws of Motion
158 High school A rocket engine has the following thrust curve in pounds:

Time / Thrust: 0.13 second 99.061 pounds

Time / Thrust: 0.38 112.202

Time / Thrust: 0.63 118.164

Time / Thrust: 0.88 continues
Solution:
Calcuation is same as the above problem except 'u' is not equal to zero but is equal to 5 mph .

Force & Laws of Motion
159 High school A car pulls a trailer weighing 700 lbs along a level road . If the car pulls with a force of 2000 N the trailer attains a speed of 20 mph after moving 30 meters starting from rest . Find the coefficient of friction between the trailer and the road . . . . continues
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Force & Laws of Motion
160 High school A cyclist just for kicks decides to roll down a 400 meter hill starting from rest and not pedaling or using his brakes . The cyclist and bike together weigh 180 lbs . if the coefficient of friction is 0.13 and the hill is inclined at an angle of 8 degrees find the cyclist's speed at the bottom of the hill . . . . continues
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Force & Laws of Motion
161 High school A student stand on a bathroom scale in an elavatorat rest on the 64th floor of a building. The scale reads 836 N . (a) As the elevator moves up, the scale reading increases in 935 N , then decreases back to 836 N . Find the acceleration of the elevator. (b) What is the bathroom scale really measuring ? . . . continues
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Force & Laws of Motion
162 High school An elevator can hold 20 people with an average of 75-kg mass . The elevator itself has a mass of 500-kg . The cable supporting the elevator can tolerate a maximum force of 2.96 x 10^4 N . What is the greatest acceleration the elevator motor can supply without breaking the cable ? . . . continues
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Force & Laws of Motion
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