Two masses, MA and MB, with MB = 2MA, are released at the same time and allowed to fall straight down. Neglect air resistance. When we compare their kinetic energies after they have fallen for equal times, we find that
a. KB = KA.
b. KB = 2KA.
c. KB = 4KA.
d. KA = 2KB.
e. KA = 4KB.
b
You might also like to view...
If the lifetime of a particle is roughly inversely proportional to the relative strength of the force involved, then for the strong, electromagnetic, and weak forces, arrange the forces according to their resulting lifetimes ranging from shortest to longest lifetimes
a. strong, electromagnetic, weak b. weak, electromagnetic, strong c. weak, strong, electromagnetic d. strong, weak, electromagnetic
You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is
a. 85 m b. 170 m c. 340 m d. 680 m e. none of the above
Have objects like Jupiter been found? How?
A. No, only Earth-like planets have been found. B. Yes, cool Jupiters have been found from the microlensing method. C. No, only Mars-like planets have been found. D. Yes, hot Jupiters have been found from the radial velocity method. E. Yes, warm Jupiters have been found from the transit method.
If an operatic aria lasts for 5.75 min, its length expressed in seconds is x s, where x is
A) less than 5.75. B) greater than 5.75.