The iron in our solar system was created from smaller-mass atomic nuclei in
a. the Earth.
b. our Sun.
c. Jupiter.
d. the big bang.
e. supernovae.
e
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In the diagram below, what is the diameter of Mercury?
a. about 240 km
b. about 2400 km
c. about 24,000 km
d. about 240,000 km
e. about 2.4´106 km
A 650-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 10.0° with the horizontal. What is the tension in the rope?
a. 1 870 N b. 660 N c. 3 740 N d. 226 N e. 1 840 N
A device that transforms mechanical energy into electrical energy is a
A) generator. B) motor. C) transformer. D) magnet. E) none of the above
Conduction: Two metal rods are to be used to conduct heat from a region at 100°C to a region at 0°C as shown in the figure. The rods can be placed in parallel, as shown on the left, or in series, as on the right. When steady state flow is established, the heat conducted in the series arrangement is
A. greater than the heat conducted with the rods in parallel. B. the same as the heat conducted with the rods in parallel. C. less than the heat conducted with the rods in parallel.