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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 15.5 m/s, at an angle of 47.5° 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.)
After you pick up a spare, your bowling ball rolls withoutslipping back toward teh ball rack with a linear speed of v = 3.36m/s. What is the linear speed of the ball when it reaches the top of the ramp
An electron that has an energy of approximately 23 eV moves between rigid walls 1.8 nm apart. Find the precise energy of the electron
A 5.25\; kg block starts at the top of a 12.1\; m long incline that has an angle of 10\deg to the horizontal. How much Kinetic Energy was lost in the collision
When the air temperature is below 0, the water at the surface of a lake freezes to form a sheet of ice. If the upper surface of an ice sheet 24.60 cm thick is at -10.30 Celsius and the bottom surface is at 0.00 Celsius, compute the time it will ta..
A car accelerates from 10 m/s to 30 m/s at a rate of 3.0 m/s^2. How far does it travel while accelerating
A biologist keeps a specimen of his favourite beetle embedded in a cube of polystyrene plastic. What is the beetle's actual distance beneath the surface
a long pipe of outer radius 3.40 cm and inner radius 2.89 cm carries a uniform charge density of 2.22 mcm3. using
four point charges each having a charge with a magnitude of 1.5 microc are at the corners of a square whose sides are 6
Light from a star has an intensity of about 75.5×10-8W/m2. how far away is it from Earth
Assume The resistance per length of the wire is 0.089 Ω/m. When the magnetic field is 0.5 T, find out the magnitude of the current through middle leg PQ of the circuit.
If the source contains the three isotopes of krypton, 82Kr, 84Kr, and 86Kr, and the ions are singly charged, find the distance between the two adjaicent lines formed by the three isotopes on the photographic plate.
A light ray in the core (n = 1.32) of a cylindrical optical fiber (the figure below) travels at an angle ?1 = 45.9° with respect to the axis of the fiber. What angle ?2 does the exiting ray make with the outside surface of the cladding
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