Projectile Motion: A hobbyist launches a projectile from ground level on a horizontal plain. It reaches a maximum height of 72.3 m and lands 111 m from the launch point, with no appreciable air resistance. What was the angle of launch if g = 9.80 m/s2?
A. 69.0°
B. 67.4°
C. 22.6°
D. 44.8°
Answer: A
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If light travels 63,000 AU in 1 year at 3 × 10^8 m/s, which of these best represents the unit of a light-year?
a. 63,000 AU b. 3 × 10^8 m/s c. 1 year d. All of the other choices are correct.
Jasper takes two books of mass m1 and m2 off the floor and places them on a shelf at height h. The change in potential energy of the book with mass m1 is four times that of the book with mass m2 . What is the relationship between m1 and m2?
a. m1 = 0.25m2 b. m1 = 0.5m2 c. m1 = 2m2 d. m1 = 4m2
Conversion of Units: The following conversion equivalents are given: 1.0 mile = 5280 ft 1.0 ft = 12 in 1 m = 39.37 in1.0 hour = 60 min 1.0 min = 60 sIf a deer runs at 4.7 mi/h, its speed, in meters per second, is closest to
A. 2.1 m/s. B. 1.7 m/s. C. 1.9 m/s. D. 2.3 m/s. E. 2.5 m/s.
Two lasers emit equal numbers of photons per second. If the first laser emits red light and the second emits blue light, the power radiated by the first is
A. equal to that emitted by the second. B. greater than that emitted by the second. C. less than that emitted by the second. D. dependent on the time interval of the emission.