A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has a speed of
A) 0 m/s.
B) 3 m/s.
C) 4 m/s.
D) 6 m/s.
Answer: D
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A 0.16 pF parallel-plate capacitor is charged to 10 V. Then the battery is disconnected from the capacitor. When 1.00 × 10^7 positive charges of magnitude |e| are now placed on the positive plate of the capacitor, the voltage between the plates changes by
a. ?5.0 V. b. ?1.1 V. c. 0 V. d. +1.1 V. e. +5.0 V.
The stress that occurs when material is pulled apart is called
A) compressional stress. B) tensional stress. C) shear stress. D) simple stress.
I stretch a rubber band and "plunk" it to make it vibrate in its fundamental frequency. I then stretch it to twice its length and make it vibrate in the fundamental frequency once again. This rubber band is made so that doubling its length doubles the tension and reduces the mass per unit length by a factor of 2 . The new frequency will be related to the old by a factor of:
a. 4.0. c. 1.4. b. 2.0. d. 1.0.
Fresnel lenses are
a. made of mirror segments b. made of the surface portions of a regular lens c. found in some auto headlamps and theater lights and rear windows of RVs d. all of the above