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A 100 kg block is started with a speed of 2"0 m/s on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0"20.
(a) Calculate the change in the internal energy of the block-belt system as the block comes to a stop on the belt,
(b) Consider the situation from a frame of reference moving at 2 0 m/s along the initial velocity of the block. As seen from this frame, the block is gently put on a moving belt and in due time the block starts moving with the belt at 2"0 m/s. Calculate the increase in the kinetic energy
A jogger's internal energy changes because he performs 6.10 105 J of work and gives off 4.9 multiplied by 105 J of heat. Determine the magnitude of the heat given off while walking
A 500 gram block attached to an ideal spring (k = 80 N/m) oscillates on a horizontal frictionless surface. Find the compression distance (x) of the spring
An alarm clock is set to sound in 20 h. At t = 0, the clock is placed in a spaceship moving with a speed of 0.72c (relative to Earth). What distance, as determined by an Earth observer, does the spaceship travel before the alarm clock sounds?
Two 2.40cm--diameter disks spaced 1.90mm apart form a parallel-plate capacitor. determine the electron's speed as it left the negative plate
A square room has 3 mirrored walls of length L with one side missing. A laser is fired from the center of the open side of the room with an angle of incidence, I, what must the angle of incidence be
A point source of light is submerged 2.2 meters below the surfaceof a lake and emits rays in all directions. What is the maximum radius that this circle could have
A particle with a charge of -1.5uC and a mass of 2.5x10-6 kg is released from rest at point A and accelerates toward point B, arriving there with a speed of 42 m/s. The only force acting on the particle is the electric force. (a) Which point is at..
When ultraviolet light of wavelength 2.54*10-5 cm and intensity 0.5 mW/cm2 form a mercury arc falls upon a clean copper surface, the stopping potential necessary to stop the emission of the photo-electrons is 0.59 V.
When you lift a bowling ball with a force of 80.2 N, the ball accelerates upward with an acceleration a. Calculate the weight of the bowling ball
A sprong-loaded toy gun shoots a 20g plastic ball. What is the launch speed if the sprong constant is 3.9×10 4 N/m 3 and the sprong is compressed 14cm ? Suppose the barrel is frictionless.
a 3.77-kg ball of clay is thrown downward from a height of 3.47 m with a speed of 4.81 ms onto a spring with k 1690
A cockroach of mass m lies on the rim of a uniform disk of mass 4m that can rotate freely about its center like a merry-go-round. compute the angular velocity of the cockroach-disk system
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