A uniform solid cylindrical log begins rolling without slipping down a ramp that rises 28.0° above the horizontal. After it has rolled 4.20 m along the ramp, what is the magnitude of the linear acceleration of its center of mass?
A) 9.80 m/s2
B) 4.60 m/s2
C) 3.29 m/s2
D) 3.07 m/s2
E) 2.30 m/s2
D
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An astronaut weighs 99 N on the Moon, where the acceleration of objects due to the gravitational attraction is 1.62 m/s2. How much does she weigh on Earth?
A) 16 N B) 61 N C) 99 N D) 600 N E) 440 N
A heavily loaded boat is floating in a pond. The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water. What happens to the surface level of the pond?
a. It stays the same. b. It goes up. c. It goes down. d. More information is needed to reach a conclusion.
A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at 99.7% the speed of light. It is unstable, and is observed to decay in an average 37.0 ?s
If this particle were at rest in the laboratory, what would be its average lifetime? A) 2.9 µs B) 18 µs C) 5.3 µs D) 12 µs E) 4.3 µs
As a charged particle moves freely in a circular path in the presence of a constant magnetic field applied perpendicular to the particle's velocity, the particle’s kinetic energy
1.remains constant. 2.increases. 3.decreases.