A 1-kg mass at the Earth's surface weighs
A) 1 N.
B) 5 N.
C) 10 N.
D) 12 N.
E) none of the above
Answer: C
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Reaction forces are given in terms of load variable P for the truss below (see boxed expressions next to reaction force arrows). The force in member FD is:
(A) 1.76P
(B) 21.76P
(C) 22.14P
(D) 24.24P
The grand unified theory (GUT) is a sought-after model that would unify three of the four forces of nature. Which force is the one it would not include?
A) gravitational B) strong C) weak D) electromagnetic
Two charged particles are placed a short distance apart, in vacuum. The electric force by one on the other
A) is transmitted instantaneously. B) is due to gravity. C) is due to friction. D) cannot be felt due to the vacuum. E) is transmitted at the speed of light.
Suppose there are 3 molecules in a container. If each molecule has a 1-in-2 chance of being in the left half of the container, what is the probability that there are exactly 2 molecules in the left half of the container?
a. 1/2 b. 1/3 c. 1/8 d. 3/8 e. 3/5