It is generally easier to push an object once it is moving than when one is getting it started. Why is this?


Sliding friction is less than static friction.

Physics & Space Science

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Unlike Venus, Mars has _____

A) volcanoes B) moons C) liquid water D) nitrogen

Physics & Space Science

What parameters determine the position of a galaxy's Galactic Habitable Zone?

A) only the amount of heavy elements in the disk B) both the amount of heavy elements AND the amount of radiation from the center C) only the temperature in the galactic disk D) only the amount of harmful radiation from the center

Physics & Space Science

According to the second law of thermodynamics,

A) the total entropy of all the participants in any physical process cannot decrease. B) thermal energy flows spontaneously from hot objects to cold objects. C) energy process that uses thermal energy to do work must have a thermal energy exhaust. D) All of the above. E) None of the above.

Physics & Space Science

An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such an engine if the temperature of the surface of the water is 59°F (15°C) and the temperature well below the surface is 41°F (5°C)?

a. 3.5% b. 67% c. 31% d. 17% e. 96%

Physics & Space Science