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What is the mean number density of galaxies within the half mass radius? Suppose the typical physical cross section of a galaxy is 10^-3 Mpc^2.
what is the maximum speed the ball can have. imagine there are no other forces acting on the particle.
A bicycle racer is going downhill at 12.2m/s when, to his horror, one of his 2.42kg wheels comes off when he is 75.0m above the foot of the hill. How much total kinetic energy does the wheel have when it reaches the bottom of the hill
Dan is gliding on his skateboard at 2.00m/s. He rapidly jumps backward off the skateboard, kicking the skateboard forward at 8.00m/s (as measured by an observer on the ground). Dan's mass is 60.0kg and the skateboard's mass is 7.00kg.
A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 1.5kg. Its volume is 2.5m^3. What is the average density of the balloon with gas
Sodium light of wavelength 589 nm is focused through a pinhole before illuminating a Young's double aperture with an aperture spacing of 1.00 mm. what is the maximum pinhole diameter
A 50 kg bag of sand at 25 C falls 10 m onto the pavement and comes to an abrupt Stop. What is the change in internal energy in the sand
q1. a block is placed at the end of the frictionless ramp and is pulled up the ramp through a solid ball on the end of
An experimental airplane is flying northwest from Nashville, at an altitude of 18,000 ft. Determine the lift
A train is traveling up a 5.0 degrees incline at a speed of 2.65 m/s when the last car breaks free and begins to coast without friction. How far did the last car travel before momentarily coming to rest
What is the coefficient of kinetic friction
A particle initially located at the origin has an acceleration of = 4.00 m/s2 and an initial velocity of i = 6.00 m/s. Find the speed of the particle at t = 3.00 s
What is magnitude of the speed of the boat
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