Why is Venus so much hotter than the Earth?

A) because it has much more carbon dioxide in its atmosphere
B) because it rotates backwards compared to its orbital rotation
C) because its clouds have a very high re?ectivity
D) because it is closer to the Sun


A

Physics & Space Science

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Five gas molecules are found to have speeds of 100, 200, 300, 400, and 500 m/s. The rms speed (in m/s) is

a. 390. b. 300. c. 360. d. 330. e. 320.

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A motorist travels for 3.0 h at 80 km/h and 4.0 h at 60 km/h. What is her average speed for the trip?

A) 74 km/h B) 140 km/h C) 70 km/h D) 73 km/h E) 69 km/h

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The ratio of power outputs of Jack and Jill is 2:1 to complete a certain amount of work. If Jill takes 4 minutes to complete this work, how long will Jack take to finish the same work?

A) 2 minutes B) 1.4 minutes C) 8 minutes D) 6 minutes E) 4 minutes

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Except for the clear link between smoking and lung cancer, most chronic diseases cannot be attributed to a single cause.

a. true b. false

Physics & Space Science