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A person stands on the edge of a roof 490m above the ground and throws a stone horizontally with an initial speed of 15 m/s. Neglecting air resistance.
Find the time taken by the stone to reach the ground. and the speed with which it hits the ground (g = 9.8 ms-2)
A mortar* crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action. How fast will the shell be traveling when it hits the ground
a 1.5- block rests on top of a 7.5- block. the cord and pulley have negligible mass and there is no significant
A Van de Graaff accelerator is essentially a parallel plate capacitor. Such a machine is changed by an electrical potential of 2.5 x 10^6 volts. What is the energy density stored in the field
The nucleus of a promethium-145 atomcontains 61 protons. Assume that thenucleus is a sphere with radius 5.69fm and with the charge of the protons uniformly spread through thesphere. At the nucleus surface, what are the magnitude and direction of the ..
After the first spring compresses a distance of 33cm, second spring acts with the first to increase the force as additional compression occurs. The car comes to rest 53.0 cm after first contacting the two-spring system. Find the car's initial spee..
A 1000kg car moving 40m/s skids to a stop. During the skid, the only force is the frictional force between the tires and the road, which is 6000N. find the distance the car moves before coming to a stop
the fundamental resonance on a string of 60 cm length fixed at both ends is 440 hz. what is the speed of a wave
Suppose you are underwater, wearing Polaroid sunglasses. Looking upward toward the water's surface, What is the intensity of the light you see
A guitar string is 90.0 centimeter long and has a mass of 3.21 gram. Find the frequencies of the fundamental and first two overtones
A 3.50 kg block on a smooth tabletop is attached by a string to ahanging block of mass 2.8 k. The blocks are released from rest and allowed to move freely. (a) Find the acceleration of the blocks, and (b) find the tension in the string.
The disc's rotational motion.
a small fly of mass 0.25 g is caught in a spiders web. the web vibrates predominately with a frequency of 4.0 hz.a what
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