An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal energy of the athlete?
A) -225 kJ
B) -1075 kJ
C) 1075 kJ
D) 225 kJ
E) 276 kJ
B
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Neutrons are scattered by the _________ of the atoms in a sample.
Fill in the blank(s) with the appropriate word(s).
Some regions along the plane of the Milky Way appear dark because
A) there are no stars in these areas. B) stars in that region are hidden by interstellar gas. C) stars in that region are hidden by dark dust particles. D) many brown dwarfs in those areas absorb light which they turn into heat. E) many black holes absorb all light from those directions.
The temperature coefficient of resistivity of iron is 5.0 × 10^?3 / °C; that of carbon is ?0.50 × 10^?3 / °C. When an iron wire and a carbon rod, each having the same 10 ? resistance at 20°C, are cooled from that temperature to ?80°C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is
a. ?0.10. b. +1.9. c. +2.1. d. ?10. e. +10.
If the net flux through a closed surface is positive, then the net charge enclosed must be positive
Indicate whether the statement is true or false