A "weightless" astronaut in an orbiting space vehicle is
A) shielded from Earth's gravitational effects.
B) beyond the pull of gravity.
C) without a support force.
D) all of the above
E) none of the above
Answer: C
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An 0.80-kg block is held in place against the spring by a 67-N horizontal external force (see the figure). The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s upon separation from the spring
The block descends a ramp and has a velocity v2 = 1.9 m/s at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.39. The velocity of the block is v3 = 1.4 m/s at C. The block moves on to D, where it stops. The spring constant of the spring is closest to A) 3900 N/m. B) 2600 N/m. C) 2000 N/m. D) 1600 N/m. E) 1100 N/m.
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a. r. b. v. c. vr. d. evr. e. mNvr.
A cheetah can maintain its maximum speed of 100 km/hr for 35.0 seconds. What minimum distance must a gazelle running 80.0 km/hr be ahead of the cheetah to escape?
a. 194 m c. 70.0 m b. 167 m d. 125 m