Consider a car with its wheels rolling (not sliding) on the road. How fast must the auto move for some point on a wheel to reach the speed of sound? Explain
What will be an ideal response?
Half the speed of sound. The bottom of the wheel has zero linear speed, the middle has the car's speed, and the top of the wheel is moving at twice the axis speed.
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The dark gray areas of the Moon visible from Earth are called _____
A) maria B) albedo C) anorthosite D) breccias
According to the ideal gas law, the only way to have high pressure is by having a high density.
Answer the following statement true (T) or false (F)
Which of the following best describes what would happen if a 1.5-solar-mass neutron star, with a diameter of a few kilometers, were suddenly (for unexplained reason) to appear in your home town?
A) The combined mass of Earth and the neutron star would cause the neutron star to collapse into a black hole. B) It would rapidly sink to the center of Earth. C) The entire Earth would end up as a thin layer, about 1 cm thick, over the surface of the neutron star. D) It would crash into Earth, throwing vast amounts of dust into the atmosphere that, in turn, would cool the Earth; this is probably what caused the extinction of the dinosaurs.
If R1 = 3.0 ?, R2 = 6.0 ?, R3 = 12 ?, and I = 0.50 A, at what rate is heat being generated in R1?
a.
20 W
b.
17 W
c.
12 W
d.
31 W
e.
6.0 W