The turntable of a record player has an angular velocity of 8.0 rad/s when it is turned off. The turntable comes to rest 2.5 s after being turned off. Through how many radians does the turntable rotate after being turned off? Assume constant angular acceleration
a. 12 rad
b. 8.0 rad
c. 10 rad
d. 16 rad
e. 6.8 rad
c
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Low levels of ionizing radiation
a. are dangerous to the human body. b. can be tolerated by the human body. c. are beneficial to the human body. d. none of the above
What is the primary topic of study in quantum mechanics?
A) the role played by atoms in astronomy B) subatomic particles and the forces with which they interact C) the mechanical movements of the heavens D) the role of relativity in astronomy
The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B =
A.
.B.
.C.
D.
.E.
A person throws a ball horizontally from the top of a building that is 24.0 m above the ground level. The ball lands 100 m down range from the base of the building. What was the initial velocity of the ball? Neglect air and use g = 9.81 m/s2
A) 202 m/s B) 9.80 m/s C) 19.6 m/s D) 45.2 m/s E) 94.4°