When the Sun runs out of nuclear fuel and expands to become a red giant,
A) the Earth's oceans will freeze solid
B) the Earth will be ejected from the solar system
C) the Earth will be destroyed
D) the Earth will experience a runaway greenhouse effect followed by the total loss of its atmosphere
D
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Magnetic Field of a Long Wire: The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 ?T. What is the magnetic field at a distance of 4 cm from this wire?
A. 2 ?T B. 4 ?T C. 6 ?T D. 8 ?T E. 10 ?T
What resistance added to 633. ? in parallel would produce an equivalent 205. ??
What will be an ideal response?
New rocks that have had their original form altered by heat and pressure, but without melting, are classified as
a. sedimentary. b. metamorphic. c. igneous. d. all of these.
Conduction: A solid cylindrical bar conducts heat at a rate of 25 W from a hot to a cold reservoir under steady state conditions. If both the length and the diameter of this bar are doubled, the rate at which it will conduct heat between these reservoirs will be
A. 200 W. B. 100 W. C. 50 W. D. 25 W. E. 12.5 W.