You throw a baseball straight up. Compare the sign of the work done by the gravitational force exerted by Earth on the object while the ball goes up with the sign of the work done by the same force while it goes down

A) The work is positive on the way up and positive on the way down.
B) The work is positive on the way up and negative on the way down.
C) The work is negative on the way up and positive on the way down.
D) The work is negative on the way up and on the way down because gravity is always downward.


C

Physics & Space Science

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A fragment of a collapsing gas cloud that comes to equilibrium with a central temperature of 4 million K will become a

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From what height above the surface of the earth should an object be dropped to initially experience an acceleration of 0.9200g? The radius of the earth is 6.38 × 106 m

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If the de Broglie wavelength of an electron is 380 nm, what is the speed of this electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)

A) 2.0 km/s B) 3.8 km/s C) 1.9 km/s D) 4.1 km/s E) 5.2 km/s

Physics & Space Science