If the Moon were four times as massive but twice as far from Earth, high tides on Earth would be

A) higher.
B) lower.
C) no different.


Answer: B

Physics & Space Science

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We find most stars still on the main sequence because this stage takes ________

Fill in the blank(s) with correct word

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Faraday's Law: According to Faraday's law, a coil in a strong magnetic field must have a greater induced emf in it than a coil in a weak magnetic field.

A. True B. False

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Spectral Series: The value of a wavelength in the Balmer series is 372.1 nm. What is the corresponding value of n?

A. 6 B. 3 C. 9 D. 10 E. 14

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The thermal efficiency e of a heat engine is defined as follows: e=W/Qh. Express the efficiency in terms of Qh and Qc.

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