A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building. If g = 9.8 m/s2 and air resistance is negligible, then what is the speed of the rock as it hits the ground?
a. 30 m/s
c. 34 m/s
b. 32 m/s
d. 36 m/s
B
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A plot of the temperature versus the energy per kg added to a piece of ice as it goes from below freezing at ?10°C to becoming steam at 110°C consists of straight lines, some horizontal and some with an upward slope. What do the upward slopes represent?
a. specific heats b. reciprocals of specific heats c. latent heats d. reciprocals of latent heats
A hole is punched in a full milk carton, 10 cm below the top. What is the initial velocity of outflow?
a. 1.4 m/s b. 2.0 m/s c. 2.8 m/s d. 3.9 m/s e. 4.2 m/s
Consider an LRC circuit. The impedance of the circuit increases if XL increases. When is this statement true?
A) always true B) true only if XL is equal to XC C) true only if XL is less than XC D) true only if XL is greater than or equal to XC E) never true
A star's apparent magnitude is a measure of
a. how bright it appears to us if it is at its actual distance. b. how bright it appears to us at a standard distance of 10 pc. c. its energy output per second compared to the Sun. d. its mass in solar masses. e. its surface temperature in Kelvin.