Which is the earliest stage of a star?
A) Helium collects within the core.
B) Carbon collects within the core.
C) The surface of the star expands into a red giant.
D) The star contracts into a blue giant.
Answer: A
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A water-filled paper cup held in a flame will not catch fire. This is because
A) the inside of the paper is wet. B) water is an excellent conductor of heat. C) paper is a poor conductor of heat. D) the paper cup cannot become appreciably hotter than the water it contains.
A key is placed in a hot oven and warmed to 100°C. As a result
a. the hole in the key becomes smaller. b. the key is bent into an arc. c. the key becomes longer. d. all of the above.
An LR circuit includes a resistor of resistance R, an inductor of inductance L and a battery of emf E = 10 V. At time t = 0 the current in the circuit is I = 0. At time t = 6.1 ms the current is I = 0.66 A. What are the values of L and R?
A) not enough information given B) L = 15 mH, R = 20 ? C) L = 10 mH, R = 100 ? D) L = 50 mH, R = 150 ? E) L = 2 mH, R = 10 ?
Single-Slit Diffraction: A single slit, which is 0.0500 mm wide, is illuminated by light of 550 nm wavelength. What is the angular separation between the first two minima on either side of the central maximum?
Fill in the blank(s) with the appropriate word(s).