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A hiker, who weighs 603 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3220 N, and rests on two concrete supports, one on each end. He stops 1/4 of the way along the bridge. What is the magnitude of the force that a concrete support exerts on the bridge (a) at the near end and (b) at the far end?
in a television set electrons are accelerated from rest through a potential difference of 15 kv. the electrons then
a 71 kg baseball lplayer jumps straight up to catch a line drive. If the 140 g ball is moving horizontally at 28 m/s, what is his speed immediately after stopping the ball
A large wooden turntable in the shape of a flat disk has aradius of 2.00m and a total mass of 120kg. Find the angular speed of the turntable after the parachutist lands
A solenoid has a cross-sectional area of 7.0 x 10-4 m2, consists of 430 turns per meter, and carries a current of 0.52 A. Find the average current induced in the coil
A roller coaster, traveling with an initial speed of 15 meters per second, decelerates uniformly at -7.0 meters per second per second to a full stop
a an ideal gas occupies a volume of 3.0-cm3 at 20degc and atmospheric pressure. determine the number of molecules of
An object of mass m moves in a circle of radius R under the influence of a force of magnitude F.
A 12.0 kilogram box resting on a horizontal, frictionless surface is attached to a 5.00 kilogram weight by a thin, light wire that passes over a frictionless pulley. determine the horizontal tension in the wire
The human eye is mainly sensitive to 560 nm light. What is the temperature of a black body that would radiate mainly intensely at this wavelength?
puck 1 of mass m1 = 0.30 kg is sent sliding across a frictionless lab bench, to undergo a one-dimensional elastic collision with stationary puck 2. What is the mass of puck 2
A 66 kilogram skier coasts up as now-covered hill that makes an angle of 25 degree with the horizontal. The initial speed of the skier is 6.6 m/s. Determine the work done by the kinetic frictional force that acts on the skis
The time required for one complete cycle of a mass oscillating at the end of a spring is 0.25s. what is the frequency of oscillation
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