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The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.5 m/s, at an angle of 53.0° above the horizontal. At this instant your opponent is 10.0 m away from the ball. He begins moving away from you 0.30 s later, hoping to reach the ball and hit it back at the moment that it is 2.10 m above its launch point. With what minimum average speed must he move? (Ignore the fact that he can stretch, so that his racket can reach the ball before he does.)
Two cars are traveling along a straight line in the same direction, the lead car at 25.2m/s and the other car at 31.0m/s. At the moment the cars are 41.9m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.07m..
A solid disk (mass = 5 kg, R=0.6 m) is rolling across a table with a translational speed of 9 m/s. What is the total kinetic energy of the disk
Dan is gliding on his skateboard at 2.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground? Dan's mass is 60 kg and the skateboard's mass is 5.0 kg.
Find the thermal conductivity of the material from which the box is made.
initially a yoga ball is partially blown up and its surface area measured. afterwards it is filled completely and its
A factory worker pushes a 30.2kg crate a distance of 5.0m along a level floor at constant velocity by pushing downward at an angle of 30? below the horizontal. What is the total work done on the crate
a 1.8 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction is applied on the block. what is the work done by the force between the initial position and x = 2.0 m
A train is rounding a circular curve whose radius is 200 m. At one instant, the train has an angular acceleration of .0015 rad/s2, Determine the angle of the total acceleration relative to the radial direction
Determine the magnitude and direction of impulse delivered to the ball by the floor.
A toroidal solenoid has a mean radius of 18.0cm and a cross-sectional area of 3.20cm2 and is wound uniformly with 85.0 turns. What is the mutual inductance of these coils
A roof tile falls from rest from the top of a building. How far abovethe top of this window is the roof
A copper wire and an aluminum wire of the same length have the same resistance. What is the ratio of the diameter of the copper wire to that of the aluminum wire
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