A motorcycle moving at 50 km/h skids 10 m with locked brakes. How far will it skid with locked brakes when traveling at 150 km/h?
A) 10 m
B) 30 m
C) 50 m
D) 90 m
Answer: D
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A metal rod of length L in a region of space where a constant magnetic field points into the page rotates about an axis through its center at constant angular velocity ?. The ends, A and E, make contact with a split ring that connects to an external circuit. The current in the external circuit of resistance R has magnitude
A.
B.
.C.
.D.
.E.
.In a single-slit diffraction experiment, the angular width of the central maximum is 0.16°. The width of the slit is then doubled as is the distance to the screen. What is the resulting angular width of the central maximum?
a. 0.64° b. 0.080° c. 0.32° d. 0.16°
If the mass of the Earth decreased by a factor of two with no change in radius, your weight would
a. increase by a factor of 4. b. increase by a factor of 2. c. stay the same. d. decrease by a factor of 2. e. decrease by a factor of 4.
The Moon does not crash into Earth because
A) Earth's gravitational field is relatively weak at the Moon. B) gravitational pull of other planets keeps the Moon up. C) Moon has a sufficient tangential speed. D) Moon has less mass than Earth. E) none of the above