A rocket develops 10,000 N of thrust at liftoff. If the speed of the ejected fuel is 2000 m/s, at what rate (in kg/s) must the fuel be ejected?

What will be an ideal response?

5 kg/s

Physics & Space Science

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A child on a skateboard is moving at a speed of 2 m/s. After a force acts on the child, her speed is 3 m/s. What can you say about the work done by the external force on the child?

a) positive work was done b) negative work was done c) zero work was done

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Physics & Space Science

Certain types of sunglasses are very effective at diminishing light reflected from surfaces because of __________

Fill in the blank(s) with correct word

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Physics & Space Science

When electric current is flowing in a metal, the electrons are moving

A) at nearly the speed of light. B) at the speed of light. C) at the speed of sound in the metal. D) at the speed of sound in air. E) at none of the above speeds.

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The Meissner effect in a superconductor

a. is lost higher than the Curie temperature. b. generates currents to counteract magnetic flux. c. makes the superconductor a perfect paramagnet below the critical field level. d. is independent of the zero resistivity property of a superconductor. e. can remain even after the temperature goes above the transition temperature.

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Physics & Space Science