A body is acted upon by a force. State two conditions when the work done is 0.

A 3.7-kg block is pushed 3.3 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of 0 = 30° with the horizontal, as shown in the figure below. If the coefficient of kinetic friction between block and wall is 0.30, determine the following. (a) the work done by F (b) the work done by the force of gravity (c) the work done by the normal force between block and wall (d) By how much does the gravitational potential energy increase during the block's motion?

A force of 6.0 N is used to accelerate a mass of 1.0 kg from rest for a distance of 12 m. The force is applied along the direction of travel. The coefficient of kinetic friction is 0.30. What is the work done  (a) by the applied force? (b) by friction? (c)What the kinetic energy at the 12-m mark? (e) Give the final fbd of the given and answer problem.

A 7.80-g bullet moving at 530 m/s penetrates a tree trunk to a depth of 4.50 cm.  (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.

A crane slowly lifts a 263 - kg crate a vertical distance of H = 13.0 m. mg crane F crane (a) How much work does the crane do on the crate? Enter to 3 significant figures W H 0 33,500 (b) How much work does the gravity do on the crate? Enter to 3 significant figures X√J XVI W gravity (c) What is the total work done on the crate? Enter to 3 significant figures ✓J W total = -33,500

A force given by (6i – 3j) N acts on an object experiencing a displacement given by (3i – j) m.  Determine the work done by the force.

Starting from rest, a 5.50-kg block slides 2.30 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is k (a) Determine the work done by the force of gravity. J (b) Determine the work done by the friction force between block and incline. J (c) Determine the work done by the normal force. (d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height? 0.436.

A-D please!!

A 3.8-kg block is pushed 2.1 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of 8 = 30° with the horizontal, as shown in the figure below. If the coefficient of kinetic friction between block and wall is 0.30, determine the following. (a) the work done by F Ⓡ (b) the work done by the force of gravity J (c) the work done by the normal force between block and wall J (d) By how much does the gravitational potential energy increase during the block's motion? J

A 7.80-g bullet moving at 570 m/s penetrates a tree trunk to a depth of 4.40 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.