The puck in the figure below has a mass of 0.260 kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 90.0 cm/s. The string is pulled downward 15.0 cm through the hole in the frictionless table. Determine the work done on the puck. (Hint: Consider the change of kinetic energy of the puck.)

In an amusement park, a car with a mass of 481 kg rolls in a track as shown below. Note that the work done by the rolling friction is not zero between the starting point and point A. If the speed of the car in point A is 21 m/s, what is the magnitude of the work done by friction between the starting point and point A? Assuming that there is no friction between points A and B, and, If the speed of the car in point A is 21 m/s, what is the magnitude of the speed of the car in point B? Assuming that there is no friction between points B and C, and, If the speed of the car in point B is 5 m/s, what is the magnitude of the speed of the car in point C?

#8

When generating maximum power from his club, Captain Caveman holds his club at a very specific angle. The bottom of his club (closest to his hands) has coordinates of (1.25, 2.5) and the top of his club has coordinates of (2.3, 3.7), measured in feet. What is the absolute angle of his club relative to the right horizontal?

Computation. The figure shows two blocks, released from rest, connected by a light string passing without slipping over a pulley with moment of inertia 0.032 kg-m² and radius 0.1 m. The coefficient of kinetic friction between the block and the table is 0.38. Using energy methods, find the blocks' speed after they have moved 0.22 m if M = 5.2 kg and m = 7.3 kg. V= M 11 m/s m Record your numerical answer below, assuming three significant figures. Remember to include a as necessary. 31 6:37 P

A block of mass m = 3.1 kg is placed on a rough incline surface making an angle e = 13.5. with horizontal. A force F parallel to the ground is applied to the block. Due to the applied force the block moved x = 1.2 meter along the inclined surface with constant speed. If the inclined surface has kinetic friction coeficient µk = 0.29 what is the work done by the applied force? Provide your answer with 2 decimal places. Take g = 9.81 m/s² m

A trunk of mass m = 2.0 kg is pushed a distance d = 158 cm up an incline with an angle of inclination theta = 21.0° by a constant horizontal force P = 350 N (see figure). The coefficient of kinetic friction between the trunk and the incline is 0.14. P. 0 Calculate the work done on the trunk by the applied force P. ? Calculate the work done on the trunk by the frictional force. ? Calculate the work done on the trunk by the gravitational force. ?

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#6

A box with with a mass m = 2kg is being pushed up a ramp by an unknown pushing force Fp. The coefficient of static friction between the box and interface is 0.7. The coefficient of kinetic friction between the box and interface is 0.6. The incline of the ramp is 15 degrees. The velocity of the box is constant. The surface of the ramp is 12 m.  What is the work done by normal force while the box is being pushed the entire length of the ramp? [ I think that it is 0 N, since the x component of normal force which is parallel to motion is 0. Is that correct?]