Consider a uniform solid sphere of radius R and mass M rolling without slipping. Which form of its kinetic energy is larger, translational or rotational?
A) Its translational kinetic energy is larger than its rotational kinetic energy.
B) Its rotational kinetic energy is larger than its translational kinetic energy.
C) Both forms of energy are equal.
D) You need to know the speed of the sphere to tell.
Answer: A
You might also like to view...
Compared to the distance between Earth and Mars, the distance between Jupiter and Saturn is
A) much larger. B) about the same. C) much smaller. D) just slightly less.
Fred swings a sheet of copper in pendulum fashion between the poles of a strong magnet. The sheet slows in entering the magnetic field because it
A) induces swirling currents in the copper and accompanying magnetic fields that resist motion. B) experiences both air and magnetic friction. C) is repelled by free electrons in the copper. D) none of the above
Again consider the scenario from the previous problem: A sprinter named Ben has challenged a beam of light to a race in the 100-meter dash. The race is held in a stadium full of spectators
At the start signal, a laser beam is turned on at the start line, pointed down the track. At the same instant, Ben bursts out of the starting blocks at 99% of the speed of light (0.99c). According to Ben, what happens? A) The light beam gradually pulls ahead of him and wins the race because it is going 1% of the speed of light faster than him. B) The light beam instantly finishes the race, before Ben even has a chance to start. C) The light beam moves out ahead of him at the full speed of light, winning the race easily. D) Ben wins the race and becomes a hero.
A boy throws a ball with an initial velocity of 25 m/s at an angle of 30° above the horizontal. If you neglect air, how high above the projection point is the ball after 2.0 s?
A) 5.4 m B) 13 m C) 25 m D) 43 m E) 50 m