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A lead ball is dropped into a lake from a diving board 5.08m above the water. It hits the water with a certain velocity and then sinks to the bottom with this same constant velocity. It reaches the bottom 4.72s after it is dropped ( Assume the positive direction is upward). How deep is the lake? What is the average velocity of the ball? Suppose that water is drained from the lake. The ball is now thrown from the diving board so that it again reaches the bottom in 4.72s. What is the initial velocity of the ball?
light of wavelength 558.0 nm is incident on a narrow slit. the diffraction pattern is viewed on a screen 78.5 cm from
A uranium-238 atom can break up into a thorium-234 atom and a particle called an alpha particle, a±-4. How much of the uranium atom's internal energy is released in the breakup
A soccer player kicks the ball toward a goal that is 21.0 m in front of him. Find the speed of the ball when the goalie catches it in front of the net
A flywheel rotates at 7200 rev/min when the power is suddenly cut off. How many revolutions does the flywheel makes before coming to rest
A roller coaster seat exerts a normal force of 120N on a 40kg passenger at the apex of a vertical loop. what is the speed of the coaster
If, on other hand, she first kicks it to player 2, who then kicks it into the net, the ball undergoes two successive displacements, y and x. What are the magnitude and direction of x and y.
A box of mass 8 kg is pulled by a force F = 50N for a distance d = 3m while friction f opposes the motion. What is the work done by the force F, the work done by friction f and work done by gravity
When a 58-g tennis ball is served, it accelerates from rest to aspeed of 39 m/s. The impact with theracket gives the ball a constant acceleration over a distance of 37 cm. What is the magnitude of the netforce acting on the ball?
A meter stick is found to balance at the 49.7cm mark when placed on the fulcrum. When a 41g mass is attached at the 23cm mark, what is the mass of the meter stick
in an eye that is farsighted the eye focuses parallel rays so that the image would form behind the retina. in an eye
A particle with charge of 28.3 µC is placed at the center of a spherical shell of radius 27.5 cm. find the total electric flux through the surface of the shell
A skier is gliding along at 3.0 m/s on horizontal, frictionless snow. He suddenly starts down a 13 degree incline. His speed at the bottom is 13 m/s. What is the length of the incline
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