A cylindrical wire has a resistance R and resistivity ?. If its length and diameter are BOTH cut in half,
(a) what will be its resistance?
A) 4R
B) 2R
C) R
D) R/2
E) R/4
(b) what will be its resistivity?
A) 4?
B) 2?
C) ?
D) ?/2
E) ?/4
What will be an ideal response?
Answer: (a) B (b) C
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An RLC series circuit has a 400
resistance, a 2.5 mH inductor, and a capacitor. If the circuit is in resonance at 30 kHz, what is the capacitive reactance?
a. 
b. 
c. 
D. 71 
E. 0.00
The purpose of using epicycles and deferents to explain the motion of the planets in the night sky was to account for
a. prograde motion. b. Mercury and Venus' limited angular distance from the Sun. c. retrograde motion. d. non-uniform speed of the planets in their orbits. e. precession of the equinoxes.
A heat engine operating between 40°C and 380°C has an efficiency 60% of that of a Carnot engine operating between the same temperatures. If the engine absorbs heat at a rate of 60 kW, at what rate does it exhaust heat?
What will be an ideal response?
According to the shell model, how many shells are required to describe the periodic table?
A) one B) seven C) eight D) eighteen