A 3rd magnitude star is 3 times brighter than a 1st magnitude star
Indicate whether the statement is true or false
F
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Sonic Booms: The half-angle of the conical shock wave produced by a supersonic aircraft is 60°. What is the ratio of the speed of the aircraft to the speed of sound?
A. 0.87 B. 1.2 C. 1.7 D. 2.0
Coulomb's Law: Four point charges Q of equal magnitude and sign are arranged on three of the corners of the square of side d as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the upper right hand corner of the square?
A. A B. B C. C D. D
A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
a. 10 m/s; 9.8 m/s2. b. 9.0 m/s; 9.8 m/s2. c. 9.0 m/s; 9.0 m/s2. d. 1.0 m/s; 9.0 m/s2. e. 1.0 m/s; 9.8 m/s2.
Double-lobed radio galaxies are____
a. spiral galaxies with unusually luminous nuclei b. elliptical galaxies with very broad emission lines c. explained by the double-exhaust model d. extremely luminous objects with high redshifts e. glowing green gases due to excitation from energy from an active core