The accurate determination of star distances by the method of standard candles requires accurate knowledge of the ________ of the standard candle.
A. temperature
B. luminosity
C. size
D. speed
Answer: B
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Constant Acceleration Kinematics: A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a forward velocity of 42 m/s. The train then moves at a constant velocity of 42 m/s for 420 s. The train then slows down uniformly at 0.065 m/s2, until it is brought to a halt. The acceleration during the first 5.6 km of travel is closest to which of the following?
A. 0.16 m/s2 B. 0.14 m/s2 C. 0.17 m/s2 D. 0.19 m/s2 E. 0.20 m/s2
The ratio R at which paint can be sprayed from a spray gun may be expressed as R = a ? t. If R is measured in m3/ s, and time is measured in seconds, what are the units of "a"?
A) m3 B) m3s C) m3 s3 D) m3/s E) m3/s2
At a distance of 10 km from a radio transmitter, the amplitude of the E-field is 0.20 volts/meter. What is the total power emitted by the radio transmitter?
a. 10 kW b. 67 kW c. 140 kW d. 245 kW e. 21 kW
A particle (m = 2.0 ?g, q = ?5.0 ?C) has a speed of 30 m/s at point A and moves (with only electric forces acting on it) to point B where its speed is 80 m/s. Determine the electric potential difference VA ? VB
a. ?2.2 kV b. +1.1 kV c. ?1.1 kV d. +2.2 kV e. +1.3 kV