Which list of metric prefixes is in order from smallest to greatest?
a. femto, centi, nano, mega, kilo
b. femto, nano, mega, centi, tera
c. mega, mega, mega, mega, mega
d. femto, nano, centi, mega, tera
e. femto, kilo, centi, mega, tera
d
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The only force acting on a 2.0-kg body moving along the x axis is given by Fx = (2.0x) N, where x is in m. If the velocity of the object at x = 0 is +3.0 m/s, how fast is it moving at x = 2.0 m?
a. 4.2 m/s b. 3.6 m/s c. 5.0 m/s d. 5.8 m/s e. 2.8 m/s
A proton and electron, each travelling at the same speed, enter a region of uniform magnetic field. They experience
A. forces in the same direction and having ratio Fp/Fe= me/mp B. forces equal in magnitude, but opposite in direction C. forces opposite in direction and having ratio Fp/Fe= me/mp D. the same force
Cosmic rays originate in the
A) Earth's interior. B) Earth's upper atmosphere. C) Sun. D) cosmos. E) none of the above
Why wasn't the intracluster medium in galaxy clusters discovered until the 1960s?
A) We did not know how much dark matter existed before then. B) We didn't have the resolution to observe galaxy clusters until then. C) The Milky Way was blocking our view of distant galaxy clusters. D) The medium emits X-rays, which are blocked by the Earth's atmosphere and require X-ray satellites in space in order to be observed. E) Radiation emitted by the medium was so dim that we couldn't detect it until we built much larger telescopes.