A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1 . (Assume the room temperature is 70°F.)
a. 217
b. 180
c. 90
d. 68
e. 850
a
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The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The velocity acquired after starting from rest is 8 m/s
a. True b. False Indicate whether the statement is true or false
A common belief is that everything that happens is predetermined by the predetermined mechanical motions of atoms, much as a clock operates. A good argument against this position is
A) Newtonian physics, on which this idea is based, cannot be conclusively proven to be true. B) many great scientists, such as Democritus, Kepler, and Newton, dispute this belief. C) science is not really relevant to our lives anyway. D) All of the above are good answers. E) Actually, there isn't any good answer to this position.
Which of the following is true of the Moon's synodic period?
A) It is slightly shorter than the Moon's sidereal period. B) It is longer than the Moon's sidereal period. C) It is the same as the Moon's sidereal period. D) It is less than half of the Moon's sidereal period.
An object is located inside a thin, uniform density spherical shell. At what locations would the object not be subject to a net gravitational force?
A) only against the inside boundary of the shell B) only at locations on a sphere that is one-half the inside radius of the shell C) anywhere within the shell D) only at locations on a sphere that is one-half the mean radius of the shell E) only at the center of the shell