What is Stefan’s law?
What will be an ideal response?
Stefan’s law is a statement or equation used to predict the rate of diffusion or
evaporation of a substance into a stagnant column of a vapor or gas.
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An object moving in a circle undergoes centripetal acceleration
a. True b. False Indicate whether the statement is true or false
Radioactivity Basics: The isotope 
U is radioactive and decays in a series to 
Th. In this series, the particles ejected from the nucleus are
A. one alpha particle and three beta-minus particles. B. three alpha particles and one beta-minus particle. C. one alpha particle and four beta-minus particles. D. four alpha particle and one beta-minus particle. E. two alpha particles and two beta-minus particles.
A battery with an emf of 12 V theoretically supplies 4 A of current to the circuit's load if internal resistance is not taken into consideration. When the internal resistance is included, the current is calculated to be 3 A. The load's resistance, R, and the internal resistance, r, are
1. R = 1 ?, r = 3 ? 2. R = 1/3 ?, r = 11/3 ? 3. R = 3 ?, r = 1 ? 4. R = 3 ?, r = 4 ?
Suppose you live at latitude 20°S. Based on the given right ascensions and declinations, which of the following stars passes closest to your zenith on its daily path through your sky?
A) Sirius: RA = 6hr 45m, dec = -16°42' B) Canopus: RA = 6hr 24m, dec = -52°41' C) Alpha Centauri: RA = 14hr 40m, dec = -60°50' D) Arcturus: RA = 14hr 16m, dec = +19°11' E) Vega: RA = 18hr 37m, dec = +38°47'