A rope with a constant tension T = 150.0 N pulls a 20.0 kg box across a horizontal floor. The rope makes an angle of 25.0 degrees above the horizontal. The coefficient of kinetic friction between the box and the floor is µk=0.150. a) Draw a free body diagram of the box, showing all forces acting on it. b) Apply Newton's 2nd law to find the acceleration of the box, in m/s?.

A sled and rider have a total mass of 61.0 kg. They are on a snowy hill. The coefficient of kinetic friction between the sled and the snow is 0.155. The angle of the hill's slope measured upward from the horizontal is 21.0°. What is the acceleration of the rider? |m/s² Is the acceleration greater, less than, or equal to your result if a more massive rider uses the same sled on the same hill? Explain. O Greater than: the acceleration scales according to the mass of the rider. O Greater than: the acceleration scales according to the ratio of the masses of the rider and sled. O Less than: the acceleration scales according to the ratio of the masses of the rider and sled. O Equal to: the acceleration is independent of mass. O Equal to: the acceleration scales according to the mass of the sled.

Two blocks connected by a rope of negligible mass are being dragged by a force at a 21° angle above horizontal (see figure below). Suppose F = 117.0 N, m, = 10.0 kg, m, = 26.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.136. Use g=9.8 m/s?. T m2 (b) Determine the acceleration of the system. m/s2 (c) Determine the tension T in the rope. N

Martha is pushing a 35 kg chair across the floor. The coefficients of friction between the chair and floor are ? s = 0.70 and ? k = 0.40. a. How hard does she need to push horizontally to just start the chair moving? b. If she applies this same force once it is moving, then what is the resulting acceleration? Draw the free-body diagram for this situation.

A crate is moving as shown is slowed down by a pushing force P. The force P has a horizontal component of 200 newtons to the left and a vertical component 300 newtons down. The mass of the crate is 90 kgs and the coefficient of kinetic friction is 0.2 and static friction is 0.4. V P What is the magnitude of the acceleration of the crate? Answer in m/s². Use g = 10 m/s². Don't guess! Use the free body diagram method.

You want to push a 22.0 kg rock up a 42.0° hill. You do so by pushing the rock with a 432.0 N horizontal force. The coefficient of kinetic friction between the rock and the hill is 0.125. What is the acceleration of the rock up the hill? What's the normal force from the hill on the rock?

Three mass are arranged as shown. Mass A is 800 kg, Mass B is 400 kg, and Mass C is 600 kg. Draw a free body diagram for each mass. Find the net, vector force on each mass. A 8 m 90° В Mass A Mass B Mass C 12 m

The question refers to a coin which is tossed straight up into the air. After it is released, it moves upward, reaches its highest point and falls back down again. Use one of the following choices (A through G) to indicate the force acting on the coin in the case described below. Answer choice J if you think that none is correct. Ignore any effects of air resistance. The coin is moving downward. A. The force is down and constant. B. The force is down and increasing C. The force is down and decreasing D. The force is zero. E. The force is up and constant. F. The force is up and increasing G. The force is up and decreasing O A O ΟΕ D OF O o J

Bran is pushing Amira in a sled. The combined mass of the sled and Amira is 40.0 kg. There is a coefficient of kinetic friction between the led and the snow of 0.205. Bran applies a 160 N pushing force at 30.0° below the horizontal. What is Amira's acceleration? (Give your answer in m/s2.)

Find T₁ The hanging sphere off the table has a mass of 2.98 kg. The string makes a 27.1° angle to the ceiling. How much does the sphere weigh? N Find T₂ T₁ N N e N The block on the table does not move. How much friction must be acting between the table and the block?