A machine part consists of 0.10 kg of iron (of specific heat 470 J/kg ? K ) and 0.16 kg of copper (of specific heat 390 J/kg ? K). How much heat must be added to the gear to raise its temperature from 18°C to 53°C?
A) 3800 J B) 4400 J C) 4000 J D) 910 J
A
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f the distance between two point charges remains constant while the size of one of the charges is quadrupled, the force between the charges is multiplied by
A. 1/4 B. 2 C. 4 D. 16
An object is 50 cm in front of a plane mirror. Its image will be located
a. 50 cm in front of the mirror. b. at the mirror's surface. c. 50 cm behind the mirror. d. 25 cm in front of the mirror. e. 25 cm behind the mirror.
A quasar in a galaxy that is merging with another galaxy would be
A) the source of a gamma ray burst. B) less luminous because of the loss of material to tidal debris during the merger. C) more luminous because of a greater supply of fuel. D) destroyed in the process of the merger. E) the source of a Type Ia supernova explosion.
On a computer, a megabyte of memory is ______________ bytes
Fill in the blank(s) with correct word