Series/Parallel Circuits: You obtain a 100-W light bulb and a 50-W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. If each one is an incandescent bulb of fixed resistance, which statement about these bulbs is correct?
A. Both bulbs glow with the same brightness, but less than their normal brightness.
B. Both bulbs glow with the same brightness, but more than their normal brightness.
C. The 100-W bulb glows brighter than the 50-W bulb.
D. The 50-W bulb glows more brightly than the 100-W bulb.
Answer: D
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Exhibit 11-1
Two birds of prey hurtling after the same mouse collide in mid-air and grab each other with their talons. Each 250-g bird is flying at 30 m/s at a 60° angle to the ground.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 11-1. What is the magnitude of their velocity, in m/s, immediately after the collision?
A. 0 B. 13 C. 15 D. 26 E. 30
Latent Heats: A substance has a melting point of 20°C and a heat of fusion of 3.6 × 104 J/kg. The boiling point is 150°C and the heat of vaporization is 7.2 × 104 J/kg at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ? K (solid), 1000 J/kg ? K (liquid), and 400 J/kg ? K (gaseous). How much heat is given up by 2.80 kg of this substance when it is cooled from 170°C to 86°C at a pressure of one atmosphere?
A. 400 kJ B. 200 kJ C. 300 kJ D. 440 kJ E. 640 kJ
A quarterback of mass 85 kg is running at 10 m/s. Also, a tackle of mass 100 kg is running at 9 m/s.
A. The tackle has the greater kinetic energy B. The quarterback has the greater kinetic energy C. The quarterback and the tackle have equal kinetic energies
A bimetallic strip is formed from two materials that have different heat capacities
Indicate whether the statement is true or false