Which of the following travel at or very near lightspeed?
A) photon
B) neutrino
C) Both of the above.
D) Z particle
E) All of the above.
C
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If the Sun were replaced by a one solar mass black hole:
A) all terrestrial planets would fall in immediately. B) we would still orbit it in a period of one year. C) we would immediately escape into deep space, driven out by its radiation. D) our clocks would all stop. E) life here would be unchanged.
Terminal Voltage and Internal Resistance: A circuit contains two batteries and a 2.0-? resistor as shown in the figure. The emfs and internal resistances of these batteries are indicated in the figure, and all numbers are accurate to two significant figures. What are the terminal voltages of (a) the 6.0-V battery and (b) the 12-V battery?
What will be an ideal response?
A boat loaded with scrap iron floats in a swimming pool. When the iron is thrown overboard, the pool level will
A) rise. B) fall. C) remain unchanged.
The specific heat capacity of a substance is the amount of energy required to raise 1 kg of the substance by a temperature of
a. 1°F. b. 10 °C. c. 10 °F. d. 1°C.