A light woman and a heavy man jump from an airplane at the same time and open their same—size parachutes at the same time. Which person reaches a state of zero acceleration first?
A) the light woman
B) the heavy man
C) both at the same time
D) not enough information
Answer: A
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The celestial equator is always located ________.
A. running east to west, between the ecliptic and the North Celestial Pole B. running due east to due west, 90 degrees from the north Celestial Pole C. in the northern sky, at an altitude equal to your latitude D. running north to south, and directly overhead E. None of these choices is correct.
An 8000-kg aluminum flagpole 100-m high is heated by the Sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10^?6 (°C)?1, the density is 2.7 × 10^3 kg/m3, and the specific heat of aluminum is 0.215 cal/g/°C.)
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2
Doubling the wavelength of a photon would ______________
a. reduce its energy to one-half b. double its energy c. triple its energy d. not change
Three resistors connected in series have individual voltages labeled DV1, DV2, and DV3, respectively. Which of the following expresses the value of the total voltage DVT taken over the three resistors together?
a. DVT = (1/DV1 + 1/DV2 + 1/DV3) c. DVT = (1/DV1 + 1/DV2 + 1/DV3)-1 b. DVT = DV1 = DV2 = DV3 d. DVT = DV1 + DV2 + DV3