Compared to the Earth, the Moon is no longer geologically active because
a. it is rotating too slowly.
b. its radioactive elements were never abundant.
c. it is much smaller in mass.
d. its crust is too thin.
e. it does not have water on its surface.
c
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The red light from a HeNe laboratory laser results from a transition in Ne. Determine the wavelength of the light given off if the energy difference between states is 1.08 eV. (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 383 nm b. 1840 nm c. 1150 nm d. 1340 nm e. 203 nm
A 2.0-kg block slides on a frictionless 25° inclined plane. A force of 4.6 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
a. 1.8 m/s2 up the incline b. 2.3 m/s2 up the incline c. 6.6 m/s2 down the incline d. 1.8 m/s2 down the incline e. 2.3 m/s2 down the incline
Why are eclipsing binaries the rarest of the three types discussed?
What will be an ideal response?
A 35.0-g cube of ice, initially at 0.0°C, is dropped into 180.0 g of water in an 70.0-g aluminum container, both initially at 35.0°C. What is the final equilibrium temperature? (Specific heat for aluminum is 900 J/kg/°C, the specific heat of water is 4 186 J/kg/°C, and Lf = 3.33 × 10^5 J/kg.)
a. 35.1°C b. 17.6°C c. 8.79°C d. 26.4°C e. 30.8°C