The basic requirement for metabolism inside cells is
A) a source of carbon and a source of energy
B) a source of carbon only
C) a source of energy only
D) the presence of ATP
A
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A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current because of electromagnetic induction
a. True b. False Indicate whether the statement is true or false
Polarization: The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity is zero at the observer. What are the two possible axis angle settings (less than 180°) of polarizer B?
A. 40° and 90° B. 40° and 130° C. 40° and 140° D. 90° and 130° E. 90° and 140°
The flatness problem and horizon problem
a. are solved if there was a sudden inflation of the Universe at time before recombination occurred. b. show that the Universe can be described as static and unchanging. c. show that dark matter must be a small fraction of the total mass of the Universe. d. imply that the Universe was once much colder than it is now. e. imply that the inflationary theory is incorrect.
How rapidly a planet loses its atmosphere depends on the planet's I. escape velocity (determined by mass and radius). II. atmospheric composition. III. temperature. IV. rotation period
a. I & II b. III & IV c. I, II, & III d. II, III, & IV e. I, II, III, & IV