It is correct to say that impulse is equal to
A) momentum.
B) the change in momentum.
C) the force multiplied by the distance the force acts.
D) all of the above
E) none of the above
Answer: B
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What was the conclusion of Feynman's first thought experiment regarding waves and particles, in which indestructible bullets are fired from a wobbly gun at a pair of slits?
a. When both slits are open, the total of bullets in this sand is the sum of bullets shot through one slit and the other. b. A bullet through one slit affects the probability that the next bullet goes through the same slit. c. Bullets rebounding from closed slits show refraction patterns. d. When both slits are open, interference patterns keep the number of bullets from reaching the full number shot one slit and then the other. e. Three times as many bullets go through two open slits as through one and then the other.
Suppose you left five 100-W light bulbs burning in the basement for two weeks. If electricity costs 10.0ยข/kW?h,
(a) how much did the electricity cost (to the nearest dollar) to leave those bulbs on, and (b) how many joules of electrical energy did they consume?
Power: A 100-W resistance heater is connected to a 110-V dc source. What current flows through the heater?
A. 1.1 A B. 2.2 A C. 3.3 A D. 4.4 A E. 0.91 A
If a child swinging to and fro on a playground swing stands up, her time for a to-and-fro swing is
A) longer. B) shorter. C) unchanged.