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A 30,000-kg freight car is coasting at 0.850 m/s with negligible friction under a hopper that dumps 110,000 kg of scrap metal into it.
(a) What is the final velocity of the loaded freight car?
(b) How much kinetic energy is lost?
consider a merry-go-round in the shape of a uniform disc of mass 400 kg and radius 3 m. two children each of mass 20 kg
Astronomers discover an exoplanet (a planet of a star other than the Sun) that has an orbital period of 3.47 Earth years in its circular orbit around its sun, Find the radius of the exoplanet's orbit
Suppose a 61 kg boy and a 43 kg girl use a mass less rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
Five charges are placed in a closed box. Each charge (except the first) has a magnitude which is twice that of the previous one placed in the box. find the magnitude of the smallest charge in the box
What is the mass in kg of the air in a scuba tank that has an internal volume of 0.01 m3 and it is pressurized o that the density of the air in the tank is 240 kg/ m3
While messing around with billiard balls, you roll the 8-ball into another ball of the same mass and initially at rest. After the collision, Find the original speed of the cue ball
A swimmer heads directly across a river, swimming at 1.49 m/s relative to the water. She arrives at a point 42.0 m downstream from the point directly across the river, What is the swimmer's speed relative to the shore
A narrow beam of light containing red (660 nm) and blue (470 nm) wavelengths travels from air through a 1.00 cm thick flat piece of crown glass and back to air again. At what angles do the two colors emerge from the glass
Treating our rigid legged friend as a particle, what is the average force his feet exert on the ground while he slows down.
A block of weight 46.7 N is hanging from a rope. The tension in the rope is 32.5 N, pulling upward on the block. What is the magnitude of the tension in the rope
You have been called to testify as an expert witness in a trial involving an automobile accident. How fast was this car traveling (to the nearest number of mph) just before the driver hit his brakes
For a hydrogen atom, determine the ratio of the ionization energy for the n = 4 excited state to the ionization energy for the ground state
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