One kilogram of chilled water (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed just to freeze the water if the room temperature is maintained at 75°F (24°C)? (Lice = 333 J/g; cice = 209 J/g/°C.)
a. 11
b. 15
c. 16
d. 13
e. 33
d
Physics & Space Science
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According to special relativity, tomorrow's travelers can travel
A) only forward in time. B) backward in time. C) both forward and backward in time.
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What is the magnitude of the sum of the forces that is required to accelerate a 1200-kg car uniformly from 0 m/s to 27.0 m/s in 10.0 s?
A) 444 N B) 1620 N C) 3240 N D) 4360 N E) 11800 N
Physics & Space Science
Forces that are equal in size and opposite in direction are known as
a. balanced forces b. net forces c. friction forces d. accelerated force
Physics & Space Science
The Carboniferous Period began about
A) 475 million years ago B) 65 million years ago C) 360 million years ago D) 542 million years ago
Physics & Space Science