Other Physics Answers

A nail on a vertical wall is pulled by means of a cord. If the cord makes an angle of 45° to the horizontal and it exerts a force of 74N on the nail, Find the effective force which tends to pull the nail out of the wall

Block 𝐴, 𝐵, and 𝐶 are placed as in figure and connected by ropes of negligible mass. Both 𝐴 and 𝐵 weigh 25 𝑁 each, and the coefficient of kinetic friction between each block and the surface is 0.35. Block 𝐶 descends with constant velocity. a) Draw two separate free-body diagrams showing the forces acting on 𝐴 and on 𝐵. b) Find the tension in the rope connecting blocks 𝐴 and 𝐵. c) What is the weight of block 𝐶? d) If the rope connecting 𝐴 and 𝐵 were cut, what would be the acceleration of 𝐶?

Two crates are connected by a rope lying on a horizontal surface. Crate 𝐴 and 𝐵 has a mass of 𝑚𝐴, and 𝑚𝐵, respectively. The coefficient of kinetic friction between each crate and the surface is 𝜇k. The crates are pulled to the right at a constant velocity by a horizontal force.  In terms of 𝑚𝐴, 𝑚𝐵, and 𝜇𝑘, calculate a) the magnitude of the force 𝐹; b) the tension in the rope connecting the blocks. Include the free-body diagram or diagrams you used to determine each answer.

Block 𝐴 has a weight 𝑤𝐴 and block 𝐵 has a weight 𝑤𝐵. Once block 𝐵 is set into downward motion, it descends at a constant speed. a) Calculate the coefficient of kinetic friction between block 𝐴 and the tabletop. b) A cat, also of weight 𝑤𝐴, falls asleep on top of block 𝐴. If block 𝐵 is now set into downward motion, what is its acceleration (magnitude and direction)? 

An object traveling with a speed of 10 𝑚/𝑠 slides on a horizontal floor. How far will it travel before coming to rest if the coefficient of friction is 0.30?

A block of mass 3.0 𝑘𝑔 slides with uniform velocity down a plane inclined 25o with the horizontal. If the angle of inclination is increased to 40o , what will be the acceleration of the block? 

A 6.0 𝑙𝑏 box is pulled along the horizontal floor by a rope that makes an angle of 30o above the horizontal. The coefficient of kinetic friction between the box and the floor is 0.10. If the tension in the rope is 1.0 𝑙𝑏, find the acceleration of the box. 

What applied horizontal force is required to accelerate a 5 𝑘𝑔 along a horizontal surface. With an acceleration of 2 𝑚/𝑠 2 if the coefficient of friction is 0.15.

A box weighing 15 𝑙𝑏 is pulled by a force of 10 𝑙𝑏 along a plane inclined 30o with the horizontal, the force being parallel to the plane. Starting from rest, how far will the box travel after 5 𝑠𝑒𝑐? 

A body starting from rest acquires a velocity of 18 cm/s in 3 𝑠. If the body has a mass of 15 𝑔. What force is exerted on the body?