Length Contraction: A spacecraft is measured by a scientist on the ground to have a length of 81 m as it flies overhead with a speed 2.4 × 108 m/s. The spacecraft then lands and its length is again measured by the scientist at rest on the ground. What result does he now get for the length of the spacecraft? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
1.4 × 102 m
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Conduction: A solid cylindrical bar conducts heat at a rate of 25 W from a hot to a cold reservoir under steady state conditions. If both the length and the diameter of this bar are doubled, the rate at which it will conduct heat between these reservoirs will be
A. 200 W. B. 100 W. C. 50 W. D. 25 W. E. 12.5 W.
Buoyancy: If a ship has a mass of 10 million kilograms, what volume of fresh water must it displace in order to float? The density of water is 1000 kg/m3.
A. 1010 m3 B. 1012 m3 C. 104 m3 D. 107 m3 E. 108 m3
Comet impacts might have been a good mechanism for seeding the hot early Earth with the water and molecules of life
Indicate whether the statement is true or false
The amount of heat required to raise 1 kg of
pure water by 1 Co is called a) a joule. b) a kilocalorie. c) a Btu. d) a calorie.