A copper and an aluminum part are bolted together as shown. Estimate the rate of diffusion of copper into the aluminum if the copper mass fraction is 0.1% at 2 mm into the aluminum at a particular time, and the diffusivity is the same as that at 500ºC.
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The neutral pion decays by 
The rest mass of the neutral pion is 135 MeV/c2. What is the energy of each of the photons if the pion is at rest when it decays?
A. 270 MeV B. 135 MeV C. 67.5 MeV D. 1.02 MeV E. This decay cannot happen.
The four visible colors emitted by hydrogen atoms are produced by electrons
a. that start in the ground state. b. that end up in the ground state. c. that start in the level with n = 2. d. that end up in the level with n = 2.
"Cosmological Redshift" refers to
A) the expansion of space itself. B) the expansion of galaxies. C) the expansion of red giants. D) the tendency of light to expand when free of gravitational influences.
A heat pump absorbs heat from the atmosphere at a rate of 30 kW. If work is being done to run this heat pump at a rate of 7.7 kW, what is the coefficient of performance (COP) of the heat pump?
A) 22 B) 0.26 C) 2.9 D) 4.9 E) 3.9