A 25-W soldering iron runs on 110 V dc. What is its resistance?
A) 0.0020 ?
B) 4.4 ?
C) 0.48 k?
D) 2.8 k?
C
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What would happen to the core of the Sun if its temperature rose slightly?
A) The rate at which fusion occurs would decrease, leading to a contraction of the core, which would in turn cause the temperature to rise even further. B) The rate at which fusion occurs would increase, leading to a contraction of the core, which would in turn cause the temperature to rise even further. C) The rate at which fusion occurs would increase, leading to an expansion of the core, which would in turn cause the temperature to drop back down. D) The rate at which fusion occurs would decrease, leading to an expansion of the core, which would in turn cause the temperature to drop back down.
A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water (of density 1000 kg/m3) while suspended from a harness. Her apparent weight is now 21.2 N. What is her density?
A) 1050 kg/m3 B) 1040 kg/m3 C) 1030 kg/m3 D) 960 kg/m3 E) 56.1 kg/m3
A permanent magnet is produced when
A. electrical fields exchange electrons with the magnetic fields. B. electrons become stuck and cease to move. C. current is made to circulate in a clockwise direction in a loop of wire. D. magnetic fields of large groups of individual atoms are permanently aligned.
If an object of mass 9 kg has a velocity of 7 m/s, what is its linear momentum?
a. 63 kg-m/s b. 1.3 kg-m/s c. 0.78 kg-m/s d. 16 kg-m/s e. cannot be determined