Which of the following situations would result in the longest days during the summer? (Assume an axis tilt of 0 degrees is an axis perpendicular to the ecliptic plane.)
A) axis tilt 0 degrees B) axis tilt -10 degrees
C) axis tilt 23.5 degrees D) axis tilt 90 degrees
D
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In relativity, two people share the same reference frame only if they
A) are not moving relative to one another. B) are both located in the same place. C) are both located in the same place and are stationary. D) agree on the laws of nature.
The Very Long Baseline Array (VLBA)
a. is the highest resolution optical telescope ever built. b. is located in Arecibo, Puerto Rico. c. is a matched pair of 8 m telescopes, one of which is in Chile and the other in Hawaii. d. is an air-borne infrared telescope. e. is a set of radio telescopes linked together electronically to provide very high resolution.
A resistor is connected to an ideal ac power supply. (a) The phase angle between the current and voltage is
A) 0 B) ?/2 radians. C) -?/2 radians. D) ? radians. E) 3?/4 radians. (b) The current in the resistor A) leads the voltage across the resistor by 90°. B) lags the voltage across the resistor by 90°. C) is in phase with the voltage across the resistor. D) the voltage across the resistor by 45°. E) lags the voltage across the resistor by 45°. (c) How does the average power dissipated in the resistor change as the frequency in the ac power supply decreases? A) It decreases. B) It increases. C) It does not change. D) It increases or decreases depending on the sign of the phase angle. What will be an ideal response?
A metric ton (or tonne) is
a. the same as a British ton. b. not defined. c. a mass unit. d. a weight unit.