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
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The rms velocity of an oxygen molecule in a gas is 390 m/s. If the absolute temperature is increased by 20%, then what is the rms velocity?
A. 427 m/s B. 502 m/s C. 567 m/s D. 604 m/s E. 635 m/s
A fragment of a collapsing gas cloud that comes to equilibrium with a central temperature of 4 million K will become a
A) T-Tauri star. B) black dwarf. C) black hole. D) brown dwarf. E) stage 1 protostar.
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
A) 272 km B) 260 km C) 554 km D) 510 km
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