When the voltage across a nonohmic resistor is doubled, the current through it triples. What happens to the power delivered to this resistor?
a. This cannot be answered with the information given.
b. The power decreases to 2/3 of the original amount.
c. The power increases to 1.5 times the original amount.
d. The power increases to 6 times the original amount.
d
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Two 4.0-? resistors are connected in parallel, and this combination is connected in series with 3.0 ?. What is the equivalent resistance of this system?
A) 1.2 ? B) 5.0 ? C) 7.0 ? D) 11 ?
In an experiment to measure the thermal conductivity of a certain material, a slab of material 10.0 mm thick separates a steam chamber from a block of ice with a square cross-section with dimensions 8.00 cm × 8.00 cm
After 5.00 min of running the experiment, 64.0 g of ice have melted. What is the thermal conductivity of this material? The latent heat of fusion of water is 33.5 × 104 J/kg, the latent heat of vaporization of water is 2.256 × 106 J/kg, and both the ice and water are under 1.00 atm of pressure. A) 0.130 W/m ? K B) 0.250 W/m ? K C) 0.440 W/m ? K D) 0.620 W/m ? K E) 1.12 W/m ? K
Which of the following is not a line of evidence supporting the hypothesis that our Moon formed as a result of a giant impact?
A) The Pacific Ocean appears to be a large crater—probably the one made by the giant impact. B) Computer simulations show that the Moon could really have formed in this way. C) The Moon's average density suggests it is made of rock much more like that of the Earth's outer layers than that of Earth as a whole. D) The Moon has a much smaller proportion of easily vaporized materials than Earth.
An example of a converging spherical mirror is a
a. flashlight reflector. b. bathroom mirror. c. spherical truck mirror. d. hubcap.