Raindrops are falling straight downward. When observed from a car traveling at 55.0 mi/h, the drops streak the side window at an angle of 60.0° with the vertical. Find the speed with which the drops are falling.
What will be an ideal response?
31.8 mi/h
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A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The velocity of the ball in m/s is
a. 0. b. 4.9. c. 9.8. d. 19.6. e. none of these.
If an elephant grows proportionally to twice its height, the area of its ears would be about
A) twice. B) four times more. C) six times more. D) eight times more. E) none of the above
An x-ray tube accelerates electrons through a potential difference of 50.0 kV. If an electron in the beam suddenly give up its kinetic energy in a collision,
what is the shortest wavelength x-ray it could produce? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = 1.60 × 10-19 C)
A conducting rod (length = 2.0 m) spins at a constant rate of 2.0 revolutions per second about an axis that is perpendicular to the rod and through its center. A uniform magnetic field (magnitude = 8.0 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the potential difference between the center of the rod and either of its ends?
a. 16 mV b. 50 mV c. 8.0 mV d. 0.10 mV e. 100 mV