A body vibrates 100 times in 20 seconds. Find its frequency and time period. a) f = 0.2 Hz T = 5sec

(b) f = 5sec T = 0.2 Hz

(c) f = 20 Hz T = 5 sec

(d) f = 5 Hz T = 0.2sec

After a big snowfall, you take your favorite rocket-powered sled out to a wide field. the field is 195 m across, and you know that your sled accelerates at a rate of 3.65 m/s2 when the rocket is on. how much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time?

In a system, when potential energy decreases, then entropy also decreases. true false

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).