A slice of bread contains about 90 kcal. If specific heat of a person were 1.00 kcal/kg•°C, by how many °C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat?
a. 2.25°C
c. 1.43°C
b. 1.86°C
d. 1.29°C
D
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Compared to optical telescopes, radio telescopes are built large because:
A) they're less expensive to make than optical telescopes. B) radio photons don't carry much energy. C) atmospheric turbulence is more of a problem. D) radio sources are harder to find. E) radio waves are absorbed by the atmosphere.
A Hooke's law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of the spring would result in the mass attaining double the kinetic energy received in the above situation?
a. 1.41d b. 1.73d c. 2.00d d. 4.00d
Which laboratory observation would most support the kinetic theory's assumption that molecules in a gas are widely separated?
a. A gas exerts the same pressure on each part of a container's wall. b. A gas is highly compressible. c. A gas with a lower formula mass diffuses more rapidly than one with a higher formula mass. d. A gas expands when the pressure on it is released.
The daytime sky is blue, on sunny days, because the atmosphere
A. absorbs the red light. B. absorbs blue light. C. is more efficient at scattering blue light. D. is most efficient at scattering red light. E. contains small amounts of water vapor that give the air its blue color.