A star cluster of age 100 million years contains no type O stars
Indicate whether the statement is true or false
TRUE
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Rotational Kinetic Energy: A solid uniform disk is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts up a ramp that makes an angle of 25° with the horizontal. What is the speed of the disk after it has rolled 3.0 m up as measured along the surface of the ramp?
A. 4.0 m/s B. 1.9 m/s C. 2.1 m/s D. 6.8 m/s E. 8.0 m/s
If y = 0.02 sin (30x - 400t) (SI units), the angular frequency of the wave is
a. 30 rad/s b. 30/2p rad/s c. 400/2p rad/s d. 400 rad/s e. 40/3 rad/s
Work is done on an object when
a. it moves in a circle at constant speed b. it is accelerated in a straight line c. it is carried horizontally at constant speed d. all of the above
A photon that is emitted during a transition in hydrogen from the n = 27 state to the n = 2 state is in which of the following series?
A. Lyman B. Balmer C. Paschen D. Brackett E. All of these choices are correct.