Which of the following picture might best describe a soap or detergent?
A) a
B) b
C) c
D) d
E) none of the above
Answer: B
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A long string is pulled so that the tension in it increases by a factor of four. If the change in length is negligible, by what factor does the wave speed change?
a. 0.25 c. 2.0 b. 0.50 d. 4.0
In what way is electric charge related to photons?
A) Photons are electrically-charged particles. B) They are not related at all. C) Electrically-charged particles interact by exchanging photons. D) Photons interact by exchanging electrically-charged particles. E) Electrically-charged particles are made of photons.
If one could transport a simple pendulum of constant length from the Earth's surface to the Moon's, where the acceleration due to gravity is one-sixth (1/6) that on the Earth, by what factor would the pendulum frequency be changed?
a. about 6.0 b. about 2.5 c. about 0.41 d. about 0.17
A battery has some internal resistance. Can the terminal voltage exceed the emf?
1.No. 2.Yes, if the battery is absorbing energy by electrical transmission. 3.Yes, if more than one wire is connected to each terminal. 4.Yes, if the current in the battery is zero. 5.Yes; no special condition is required.