Which "sphere" does an astronomer most directly study?

a. biosphere

b. exosphere

c. geosphere

d. cryosphere E. atmosphere F. hydrosphere

If two plates diverge at a rate of 1.3 cm/year, howmuch farther apart will the plates be after 200 millionyears?

Two identical spheres of equal mass a distance of 10 m apart a surface gravity of 0.0050 to each other where are the masses

A car, a bicycle a mouse and a bug have the same velocity. Which has the greatest momentum

Shelli is a student describing the resonance of a metal beam. She demonstrates that the sound dims when the beam is vibrated at a certain frequency. What does she most likely say in response to the dimming sound?

What two things must occur in order to perform work on an object?

8. A force of 80 pounds on a rope is used to pull a box up a ramp inclined at 100 from the horizontal. The rope forms an angle of 330 with the horizontal. How much work is done pulling the box 25 feet along the ramp?

A raindrop has a mass of 5.4 * 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted (a) on the raindrop by the earth and (b) on the earth by the raindrop.

As an astronaut travels towards Earth, her weight A. decreases because gravity decreases. B. decreases because her mass decreases. C. increases because gravity increases. D. remains the same because her mass remains the same.

Lightning often strikes water. a. True b. False

How much work must be done on a 10 kg snowboard to increase its speed from 4 m/s to 6 m/s?