What can investigators use the law of conservation of momentum to determine from the details at the scene of a car accident?
a. Which, if any, of the two cars were motionless when it was hit.
b. Whether or not the driver was drunk.
c. Which direction the hit-and-run driver went off in.
d. Whether either of the cars was over the speed limit.
e. How many people were in each car.
d
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In what way do observations of Mercury support Einstein's general theory of relativity?
A) Mercury's orbit slowly precesses in a way that matches the prediction of general relativity but disagrees with the prediction based on Newton's universal law of gravitation. B) Einstein discovered that time runs slower on Mercury than on Earth, as his theory predicted. C) Einstein was able to explain the fact that Mercury orbits the Sun exactly twice for every three rotations, and Newton's theory of gravity cannot account for this. D) We can see that Mercury lies deeper in the spacetime bowl that surrounds the Sun than does Earth.
A wire of resistivity ? must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must
A) be two times the original diameter. B) be the same as the original diameter. C) be one-fourth the original diameter. D) be one-half the original diameter. E) be four times the original diameter.
A main sequence star has 3 times the mass of the Sun. Using ________ we find that the star is ________ times more luminous than the Sun.
A. the Stefan-Boltzmann law; 3 B. the inverse-square law; 9 C. the mass-luminosity relation; 3 D. Wien's law; 3 E. the mass-luminosity relation; 9
The direction of a magnetic field at a point can be determined by a compass
a. True b. False Indicate whether the statement is true or false