We are able to define a mechanical equivalent for heat because
A. some thermal energy can be converted into mechanical energy.
B. mechanical energy can be converted into thermal energy.
C. work can be converted into thermal energy.
D. some thermal energy can be converted into work.
E. all of the above can occur.
Answer: E
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The Earth owes its habitability primarily to
A) the chemical composition of its surface B) a combination of its size and its distance from the Sun C) its size only D) its distance from the Sun only
A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?
A. 42 kN B. 39 kN C. 45 kN D. 48 kN E. 35 kN
Astronomers believe that the hydrogen atoms in your body were created
a. in the planets. b. inside the stars. c. in the Sun. d. in the big bang. e. in neutron stars.
Diffraction is most closely related to
A) refraction. B) reflection. C) interference. D) polarization. E) dispersion.