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While standing atop a building 50.7 m tall, you spot a friend standing on a street corner. Using a protractor and a dangling plumb bob, you find that the angle between the horizontal and the direction to the spot on the sidewalk where your friend is standing is 23.5°. Your eyes are located 1.98 m above the top of the building. How far away from the foot of the building is your friend?
assume four objects each of mass m are placed at the corners of a square os side length, How much work is needed to separate the planets so that they are infinitely away from each other
In Rutherford's famous scattering experiment, α particles (helium nuclei) were fired at 2.0 x 10^7 m/s over a large distance toward a gold nucleus with charge +79e
The coefficient of performance of a refrigerator is 4.70. The compressor uses 20.0J of energy per cycle. How much heat energy is exhausted per cycle
A 1 kg ball is attached to a 2 m long piece of very light string and suspended in such a way that it can freely swing and it passes just above the ground. completely describe the motion of the two masses after the 1 kg ball is released
A light source emits two spectral lines: one at 473 nm and one at 722 nm. what is the distance between the two spectral lines in the first order spectrum
Fusion reactors attempt to utilize the same nuclear reaction that occurs within the sun. Two deuterium nuclei will combine together to form helium if they are close enough, How fast must the deuterium nuclei be going to touch
If a person of mass M simply moved forward with speed V, his kinetic energy would be1/2 MV^2. However, in addition to possessing a forward motion, What is the average angular velocity of his arms and legs
Suppose you carry a bag of groceries weighing 151 N from your car to your kitchen, a distance of 38 m, without raising or lowering the bag. What is the work done by the force you exert on the bag
question1you hold a brick at rest in your hand. a how numerous forces act on the brick? b recognize these forces. c are
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 cement block accidentally falls from rest from the ledge of a 74.8-m-high building. When the block is 18.4 m above the ground, a man, 2.10 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have ..
The brakes of a truck cause it to slow down by applying a retarding force of 4060 N to the truck over a distance of 1150 m
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