Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on an isolated piece of tissue paper with his best punch. You

A) agree that it can't be done.
B) have reservations about this assertion.
C) disagree, for a good punch easily delivers this much force.


Answer: A

Physics & Space Science

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The__________is the spiral galaxy that contains the Sun

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If the atmosphere’s “optical thickness” n depended on the ratio of the concentrations to the first power instead of to the 1/2 power in equation T10.8a, would this accelerate or brake the warming compared to the model in the text?

Equation T10.8a:


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B. Brake
C. No change

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Two long bar magnets are aligned so that north poles face each other. The magnets are separated by 1 cm, and a repulsive force between the north poles is 0.04 N. When the separation is increased to 2 cm the force will be

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Visible light coming from the Sun is a combination of all colors called ________ light.

A. spectral B. white C. ultraviolet D. visible E. yellow

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