A piece of taffy slams into and sticks to another identical piece of taffy at rest. The momentum of the two pieces of taffy stuck together after the collision is the same as it was before the collision
Kinetic energy is a different story, for part of it turns into heat. What percentage of the kinetic energy converts into heat?
A) 0%
B) 25%
C) 50%
D) 75%
E) not enough information
Answer: C
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A light ray is incident on the surface of water (n = 1.33) at an angle of 60° relative to the normal to the surface. The angle of the reflected wave is
A. 80°. B. 40°. C. 20°. D. 60°. E. 30°.
What size capacitor should be placed in series with a 30-? resistor and a 40-mH inductive coil if the resonant frequency of the circuit is to be 1.0 kHz?
A) 3.3 µF B) 0.63 µF C) 6.0 µF D) 4.5 µF E) 2.0 µF
A river 100 m wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water leaves the west bank. To land at a point due east of its starting point, the boat must be pointed
A) northeast. B) east. C) southeast. D) nowhere–it can't be done.
The time interval during which a nucleus has a 50% probability of decaying is its
a. half-life. b. decay time. c. nuclei activation time. d. binding energy time. e. none of the above.