The brightest stars in a young open cluster will be:
A) massive blue stars at the top left on the H-R diagram.
B) red T-tauri stars still heading for the main sequence.
C) red giants that are fusing helium into carbon.
D) yellow giants like our Sun, but much larger.
E) the core stars of planetary nebulae.
A
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A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of
A) less than 1 unit. B) more than 1 unit. C) 1 unit. D) not enough information
You push your physics book across your desk, leaving the book at rest on the desk at the end of the process. Which of the following best represents the overall energy conversion during this process?
A) kinetic to thermal B) thermal to chemical C) chemical to electromagnetic D) chemical to thermal E) elastic to thermal
When thermal energy is added to boiling water, the water temperature
A) increases. B) decreases. C) remains the same.
A 0.28-kg stone you throw rises 34.3 m in the air. The magnitude of the impulse the stone received from your hand while being thrown is
a. 0.27 N s. b. 2.7 N s. c. 7.3 N s. d. 9.6 N s. e. 34.3 N s.