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A tennis player, when performing a serve, applies an average force to a tennis ball of 525 N to a 55 g ball.
The time of contact with the ball is 0.006 s.
a) What is the speed of the ball as it leaves the racket?
b) How would the speed change if the player increased contact time by 0.0005 s?
After collision, the component of the total momentum parallel to the floor must remain zero, since the net external force acting on the plate has no component parallel to floor.find out the masses of pieces 1 and 2.
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Two positive charges, one of magntude Q and the other of magnitude 2Q, and one negative charge of magnitude -Q are placed on a straight line, Find both the magnitude and direction of the net force on the positive charge on the left
A rotating water pump works by taking water in at one side of the rotating wheel, and expelling it from the other side. If a pump with a radius of 0.120m starts from rest and accelerates at 30.50 rad/s2.
An RL series circuit has R = 72.0? and L = 2.20mH . The series combination is connected across a 155V (rms), 58Hz power supply. Find the impedance of the RL combination
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A man pulls a crate of mass 75.0 kg across a level floor. He pulls with a force of 180.0 N at an angle of 26.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 130.0 N. If the cr..
Two point charges are fixed on the y axis: a negative point charge q1 = -28 µC at y1 = +0.23 m and a positive point charge q2 at y2 = +0.31 m. A third point charge q = +8.7 µC is fixed at the origin. The net electrostatic force exerted on the char..
A block is given an initial velocity of 5 m/s up a frictionless 20 ° incline. How far up the incline does the block slide before coming (momentarily) to rest.
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