A 5,000 kg satellite is orbiting the Earth in a circular path. The height of the satellite above the surface of the Earth is 800 km. The velocity of the satellite is 
A. 7,460 m/s.
B. 6,830 m/s.
C. 6,430 m/s.
D. 5,950 m/s.
E. 5,350 m/s.
A. 7,460 m/s.
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The normal force that acts on a block of ice that slides on a ramp
A) is equal to mg at all angles. B) decreases as the slope of the ramp increases. C) becomes greatest when the ramp is vertical.
What evidence suggests that Enceladus has ongoing geological activity?
A) Voyager 2 photographed liquid nitrogen geysers 10 kilometers tall. B) Lack of impact craters on much of its surface, evidence of ice flows from possible volcanic activity, and geysers that supply material for the E-ring. C) Voyager 1 showed sulfur eruptions all over its pizza-pie colored surface. D) Enceladus is located within Saturn's Roche limit, and ready to blow up. E) Enceladus undergoes severe tidal stresses from its resonance with Titan.
An object 20-cm high is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)?
a. 5.13 b. 5.56 c. 5.72 d. 5.93 e. 4.55
An astronaut has landed on Planet N-40 and conducts an experiment to determine the acceleration due to gravity on that planet
She uses a simple pendulum that is 0.640 m long and measures that 10 complete oscillations 26.0 s. What is the acceleration of gravity on Planet N-40? A) 4.85 m/s2 B) 1.66 m/s2 C) 3.74 m/s2 D) 2.39 m/s2 E) 9.81 m/s2