As a body falls through air starting from rest, its acceleration
a. is zero
b. stays constant
c. continuously decreases
d. continuously increases
e. gets smaller and smaller, eventually approaching zero
E
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Which of the following statements about quantum tunneling is not true?
A) Although it has been observed to occur, it violates all other known laws of nature and explaining it therefore represents a major challenge to physicists. B) It is used in modern electronics and, in fact, our modern-day computers would not work without it. C) It plays a crucial role in nuclear fusion in the Sun. D) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers.
You look inside your piano and find that there are two types of strings: bare steel wire and steel wire wrapped with a copper coil. If you have one of each type of string with the same length and under the same tension, which will produce a lower frequency sound wave?
A. The bare wire will have a lower frequency. B. The wrapped wire will have a lower frequency. C. They will have the same frequency.
If I short out a D cell and draw a current of 7 A for 5 s, how many coulombs of charge move through the circuit?
a. 7 C b. 5 C c. 7/5 C d. 35 C
There are more neutrons than protons in most nuclei because neutrons have a smaller mass than the protons
What will be an ideal response?