A resistor is made out of a wire having a length L. When the ends of the wire are attached across the terminals of an ideal battery having a constant voltage V0 across its terminals, a current I flows through the wire
If the wire were cut in half, making two wires of length L/2, and both wires were attached across the terminals of the battery (the right ends of both wires attached to one terminal, and the left ends attached to the other terminal), how much current would the battery put out?
A) 4I
B) 2I
C) I
D) I/2
E) I/4
A
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Calorimetry: A 90-g aluminum calorimeter contains 390 g of water at an equilibrium temperature of 20°C. A 160-g piece of metal, initially at 305°C, is added to the calorimeter. The final temperature at equilibrium is 32°C. Assume there is no external heat exchange. The specific heat capacities of aluminum and water are 910 J/kg ? K (aluminum) and 4190 J/kg ? K (water). What is the specific heat capacity of the 160-g piece of metal?
A. 470 J/kg ? K B. 430 J/kg ? K C. 350 J/kg ? K D. 310 J/kg ? K E. 510 J/kg ? K
What is light?
A. Light is radiant energy in the form of a wave of electromagnetic energy. B. Light is radiant energy that can be mathematically treated as a wave or particle of energy. C. Light is radiant energy in the form of a stream of energy particles, called photons. D. None of these choices are correct.
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
A. +2.0 J B. +20 J C. ?2.0 J D. ?20 J E. +40 J
The radioactivity due to carbon-14 measured in a piece of a wood from an ancient site was found to produce 20 counts per minute from a given sample,
whereas the same amount of carbon from a piece of living wood produced 160 counts per minute. The half-life of carbon-14, a beta emitter, is 5730 y. The age of the artifact is closest to A) 15,000 y. B) 23,000 y. C) 5700 y. D) 17,000 y. E) 12,000 y.