A frictionless simple pendulum on Earth has a period of 1.75 s. On Planet X its period is 2.14 s. What is the acceleration due to gravity on Planet X?

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6.55 m/s2

Physics & Space Science

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What does c2 have in common with ??

A) they are both proportionality constants B) they have similar numerical values C) they both involve different kinds of speed D) all of the above

Physics & Space Science

The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III

?
The object’s acceleration is zero only in region II.

a.
True

b.
False

Physics & Space Science

Imagine an advanced civilization living on a planet orbiting at a distance of 10 AU (1.5 billion kilometers) from a close binary star system that consists of a 15 MSun red giant star and a 10 MSun black hole

The black hole is surrounded by an accretion disk. Sometime within the next million years or so, the civilization's planet is likely to be doomed because A) the red giant will probably supernova within the next million years. B) jets of material shot out of the accretion disk will shoot down their planet. C) the red giant star, which provides most of energy the civilization needs to exist, will soon be destroyed in the accretion disk. D) tidal forces from the black hole will rip the planet apart.

Physics & Space Science

Why are the designs of the Hubble and Chandra Space Telescopes different?

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Physics & Space Science