At t = 0, a wheel rotating about a fixed axis at a constant angular acceleration has an angular velocity of 2.0 rad/s. Two seconds later it has turned through 5.0 complete revolutions. What is the angular acceleration of this wheel?
a. 17 rad/s2
b. 14 rad/s2
c. 20 rad/s2
d. 23 rad/s2
e. 13 rad/s2
B
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If two objects are the same size, but one object has a temperature 3 times as hot (in Kelvin) as the other object, the hotter object emits
A) 3 times as much energy. B) 9 times as much energy. C) 12 times as much energy. D) 81 times as much energy. E) 27 times as much energy.
What property of a molecular cloud does not counteract gravitational contraction?
A) thermal pressure B) turbulent motions C) magnetic fields D) fragmentation
1 If the person shown here on the ground is in an inertial reference system, his friends in the van moving by at constant velocity are also in an inertial reference system. True False
Indicate whether the statement is true or false