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 tangential velocity of a point 4.0 cm from the center at the time 10.0 seconds from the start?
A. 0.50 rad/s
B. 0.40 rad/s
C. 0.30 rad/s
D. 0.20 rad/s
E. 0.10 rad/s
D. 0.20 rad/s
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Slanting Surfaces With Friction: A 5.0-kg box slides on the surface on a ramp that rises at 37° above the horizontal. The coefficient of kinetic friction between the box and the surface of the ramp is 0.60. What are the magnitude and direction of the acceleration of the box if it is sliding (a) up the ramp, (b) down the ramp?
What will be an ideal response?
Spring tides occur during the new and full lunar phases
a. True b. False Indicate whether the statement is true or false
As a basketball player starts to jump for a rebound, he begins to move upward faster and faster until he leaves the floor. During this time that he is in contact with the floor, the force of the floor on his shoes is:
a. bigger than his weight. b. equal in magnitude and opposite in direction to his weight. c. less than his weight. d. zero.
The fundamental frequency of CO is 6.42 × 10^13 Hz. If the atomic masses are 12 u and 16 u (1 u = 1.66 × 10^?27 kg), find the force constant (in N/m) for the diatomic molecule
a. 970 b. 1 530 c. 1 850 d. 480 e. 47