The length of a certain wire is kept same while its radius is doubled. What is the change in the resistance of this wire?
A) It is doubled.
B) It is quadrupled.
C) It is reduced by a factor of 2.
D) It is reduced by a factor of 4.
E) It is reduced by a factor of 8.
D
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The solar constant refers to that fact that the Sun's luminosity has remained unchanged in the age of the solar system
Indicate whether the statement is true or false
Astronomers have found evidence that the expansion of the Universe is accelerating. Such acceleration
A. is deduced because distant galaxies are receding more slowly than expected from the Hubble law. B. is deduced because distant galaxies are receding faster than expected from the Hubble law. C. is deduced because nearby galaxies are receding faster than expected from the Hubble law. D. was predicted by the Big Bang model in cosmology.
Different observers always agree about the order of events that occur at the same place
Indicate whether the statement is true or false
A metal sphere of radius 10 cm carries a charge of +2.0 ?C. What is the magnitude of the electric field 5.0 cm outside the sphere's surface?
A) 4.0 × 105 N/C B) 8.0 × 105 N/C C) 4.2 × 106 N/C D) 4.0 × 107 N/C E) 8.0 × 107 N/C