An object moving in a circle undergoes
a. constant acceleration
b. free fall
c. centripetal acceleration
d. linear acceleration
e. frequency
C
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Hypernovae are
a. supernovae that occur when two red dwarfs collide. b. supernovae that occur when 10-solar-mass stars explode. c. supernovae that occur when stars more massive than 25 solar masses explode. d. one theory to explain the production of gamma-ray bursters. e. supernovae that occur when stars more massive than 25 solar masses explode and one theory to explain the production of gamma-ray bursters.
A boy throws a rock with an initial velocity of 2.15 m/s at 30.0° above the horizontal. If air resistance is negligible, how long does it take for the rock to reach the maximum height of its trajectory?
A) 0.110 s B) 0.194 s C) 0.215 s D) 0.303 s
The quantity "stress" expressed in terms of the fundamental quantities (mass, length, time) is equivalent to:
a. MLT-1. c. M2L-1T-3. b. ML-1T-2. d. a dimensionless quantity.
Proportional Reasoning: A car is able to stop in a distance d. Assuming the same braking force (and therefore the same acceleration), what distance does this car require to stop when it is traveling twice as fast?
A. d
B. 2d
C. 
d
D. 4d
E. 2
d