The ether theory of light propagation is
A) much used.
B) incomplete, but still useful.
C) unexplained.
D) discredited.
Answer: D
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A car moving at a steady 10 m/s on a level highway encounters a depression that has a circular cross-section with a radius of 30 m
The car maintains its speed as it drives through the depression. What is the force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression? A) 200 N B) 390 N C) 790 N D) 490 N E) 590 N
When a hydrogen bomb explodes, hydrogen fuses to form helium. According to Einstein's mass-energy equivalence [that is, according to E=mc2], does this result in an change in the total mass of the material?
A) Yes, the mass increases, but by such a small amount that it would be impossible to measure it. B) Yes, the mass increases, and by a measurable amount. C) Yes, the mass decreases, and by a measurable amount. D) Yes, the mass decreases, but by such a small amount that it would be impossible to measure it. E) No, the mass remains exactly the same.
In a series RLC circuit an inductor will be dominant at higher frequencies
Indicate whether the statement is true or false
Moment of Inertia: In the figure, a weightlifter's barbell consists of two identical small but dense spherical weights, each of mass 50 kg. These weights are connected by a thin 0.96-m rod with a mass of 24 kg. Find the moment of inertia of the barbell through the axis perpendicular to the rod at its center, assuming the two weights are small enough to be treated as point masses.
Fill in the blank(s) with the appropriate word(s).