1 of 3 21 HW4 Due:10s 1. A 25 kg mass is suspended at the end of a horizontal, m
ID: 1882265 • Letter: 1
Question
1 of 3 21 HW4 Due:10s 1. A 25 kg mass is suspended at the end of a horizontal, massless rope that extends from a wall on the left and from the end of a second massless rope connected to a wall on the right at an angle of 130° from the horizontal rope (up 50P from horizontal). What are the tensions in the ropes? 500 25kg 2. A 10 kg block is being pulled with a string parallel to a ramp that makes an angle of 30 with the horizontal. The tension on the string is right at the point where a tension would cause the box to move up the ramp, but it does remain stationary. The coefficient of static friction between the box and the ramp is 0.13. What is the tension in the string? 3. A 5 kg block is held at rest against a vertical wall by a horizontal force of 10ON. (a) What is the frictional force exerted by the wall on the block? (b) What is the minimum horizontal force needed to prevent the block from sliding down the wall if the coefficient of static friction between the wall and the block is 0.4? 4. A 10-kg block of wood rests on the top of a 20-kg block which rests on a horizontal surface. The lower block is then pulled to the right at constant speed by a horizontal force while the top block is held at rest by a horizontal string PHYS 111/211 HW4 Name Due:10ys attached to it. If the coefficient of kinetic friction between all surfaces is 0.25 (a) what is the tension in the string, and (b) the force pulling the bottom block?Explanation / Answer
1.
Equilibrium of forces along vertical forces
T2 sin 50= mg
T2= 25*9.8/sin 50
T2= 319.82 N
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Equilibrium of forces along horizontal
T3= T2 cos 50= 319.82* cos 50= 205.58 N
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