If the current in the 4.0-? resistor is 1.4 A, what is the magnitude of the potential difference, VA ? VB?
a.
69 V
b.
55 V
c.
62 V
d.
48 V
e.
31 V
d
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The spectra of the coolest stars contain strong absorption features (or lines) of
a. TiO molecules. b. ionized helium. c. helium. d. hydrogen. e. All of the other choices are correct.
Length Contraction: Observer A sees a ruler moving by in a relativistic rocket and measures its length to be LA. Observer B moves along with the rocket and measures the length of the ruler to be LB. What is true about these two length measurements?
A. LA > LB B. LA = LB C. LA < LB D. LA could be greater or smaller than LB depending on the direction of the motion.
Conventional automobile efficiencies cannot conceivably be higher than about 25%, even with perfect engineering. This is due to
A) the law of conservation of energy. B) frictional loses inside the car plus unburned hydrocarbons. C) the second law of thermodynamics. D) road friction. E) air resistance plus road friction.
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The power you supply to the crate is Fd/t
a. True b. False Indicate whether the statement is true or false