A hot pizza contains heat
a. True
b. False
Indicate whether the statement is true or false
False
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A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 25.0 seconds from the start?
A. 0.47 
B. 0.40
C. 0.34
D. 0.24
E. 0.20
Which of the following is the rate at which energy is transferred?
a. potential energy b. kinetic energy c. mechanical energy d. power
Because they all involve formation of iron in the cores of massive stars, all Type II supernovae are approximately equally luminous
Indicate whether the statement is true or false
A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together
(a) What is the speed of the wreckage just after the collision? (b) In what direction does the wreckage move just after the collision?