The magnitude scale
a. originated just after the telescope was invented.
b. can be used to indicate the apparent intensity of a celestial object.
c. was devised by Galileo.
d. is no longer used today.
e. was used to determine the rate of precession.
b
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Series/Parallel Circuits: Three resistors with resistances of 2.0 ?, 6.0 ?, and 12 ? are connected across an ideal dc voltage source V, as shown in the figure. If the total current in the circuit is I = 5.0 A, what is the current through the 12-? resistor?
A. 1.7 A B. 2.5 A C. 0.56 A D. 5.0 A E. 0.75 A
An airplane moves 140 m/s as it travels around a vertical circular loop which has a 1.0-km radius. What is the magnitude of the resultant force on the 70-kg pilot of this plane at the bottom of this loop?
A. 2.1 kN B. 1.4 kN C. 0.69 kN D. 1.5 kN E. 1.3 kN
Why does the high specific heat of water make it useful as a coolant?
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Gamma radiation is in fact which of the following?
a. electrons c. positrons b. high energy quanta d. helium nuclei