A 2.00-kg object traveling east at 20.0 m/s collides with a 3.00-kg object traveling west at 10.0 m/s. After the collision, the 2.00-kg object has a velocity 5.00 m/s to the west. How much kinetic energy was lost during the collision?
A) 91.7 J B) 0.000 J C) 458 J D) 175 J E) 516 J
C
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By what primary heat transfer mechanism does one end of an iron bar become hot when the other end is placed in a flame?
A) natural convection B) conduction C) radiation D) forced convection E) countercurrent.
Until we sent missions to the Moon, no one on Earth had seen the far side of the Moon.
Answer the following statement true (T) or false (F)
Why does the rotation of a protostar slow down over time?
A) Magnetic fields can transfer angular momentum to the protostellar disk and protostellar winds can carry angular momentum away. B) All rotating objects slow down over time. C) The onset of fusion causes the rotation rate to slow dramatically. D) Magnetic fields of other stars interact with the magnetic fields of the protostars, slowing its rotation.
Length Contraction: Astronaut Jill leaves Earth in a spaceship and is now traveling at a speed of 0.280c relative to an observer on Earth. When Jill left Earth, the spaceship was equipped with all kinds of scientific instruments, including a meter stick. Now that Jill is underway, how long does she measure the meter stick to be?
A. 1.00 m B. 0.960 m C. 1.04 m D. 0.280 m E. 1.28 m