A person drops a brick from the top of a building. The height of the building is 400 m and the mass of the brick is 2.00 kg. What will be the speed of the brick right before it touches the ground? Use g = 10.0 m/s2
A) 10.0 m/s
B) 13.2 m/s
C) 89.4 m/s
D) 59.4 m/s
E) 63.2 m/s
C
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Which wavelength band uses observatories on aircraft?
a. ultraviolet b. visual c. infrared d. X-ray
Light enters glass from air. The angle of refraction will be
A) greater than the angle of incidence. B) equal to the angle of incidence. C) less than the angle of incidence.
A 5-g coin is dropped from a 300-m building. If it reaches a terminal velocity of 45 m/s, and the rest of the energy is converted to heating the coin, what is the change in temperature (in °C) of the coin? (The specific heat of copper is 387 J/kg/°C.)
a. 9 b. 2 c. 5 d. 21 e. 0.5
If Star A is twice as far as Star B, and they are identical in all other ways, then the brightness of Star A would be
A. the same brightness as Star B. B. twice the brightness of Star B. C. one-fourth the brightness of Star B. D. four times the brightness of Star B. E. one-half the brightness of Star B.