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Suppose that you loft the ball with an initial speed of v = 16.2 m/s, at an angle of ? = 49.4° above the horizontal. At this instant your opponent is d = 10.1 m away from the ball. He begins moving away from you 0.400 s later, hoping to reach the ball and hit it back at the moment that it is h = 2.04 m above its launch point. With what minimum average speed must he move?
An astronaut travels at a speed of 0.93c from the Earth to a distant star that is 4.5e+17 m away. how old is she when she arrives at the star
The tube of a mercury thermometer has an inside diameter of 0.142 mm. The bulb has a volume of 0.242 cm^3. How far will the thread of mercury move when the temperature changes from 12.1 degrees C to 30.9degrees C
Air is trapped above liquid ethyl alcohol in a rigid container. If the air pressure above the liquid is 1.11 atm, determine the pressure in the bulb inside a bubble 4.0 m below the surface of the ethanol.
A uniform rod rotates in a horizontal plane about a vertical axis through one end. The rod is 13.00 m long, weighs 21.67 N, Calculate the rotational inertia of the rod
Electric charge can accumulate on an airplane in flight. You may have observed needle-shaped metal extensions on the wing tips and tail of an airplane. What is the electric potential of each sphere
Inside a motor, 30.0 A passes through a 250-turn circular loop that is 10.0 cm in radius. What is the magnetic field strength created at its center
A particle moves with constant acceleration a. The expression v1+at represents the particle's velocity at what instant in time.
Astronauts use a centrifuge to simulate the acceleration of a rocket launch. The centrifuge takes 40.0s to speed up from rest to its top speed of 1 rotation every 1.50s, What is the astronaut's tangential acceleration during the first 40.0s
A person pushes on a stationary 125 N box with 64 N at 30 deg below the horizontal, What is the force friction on the box
A 3.7-m-tall, 60-cm-diameter concrete column supports a 2.0×10^5 load. By how much is the column compressed
A box weighing 900 N rests on a surface. A force of 500 N is pushing on the side of the box. find The magnitude of static friction acting on the box
Suppose the traffic light is hung so that the tensions T1 and T2 are both equal to 84.7 N. Find the new angles they make regarding the x axis. (By symmetry, these angles would be the same.)
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