The vector sum of three co-planar forces
a. must be zero.
b. must be perpendicular to one of the three.
c. must be parallel to one of the three.
d. must be perpendicular to the plane.
e. may have any direction in the plane.
e
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Consider the data points together with the models in the graph of expansion models. Which model is most strongly supported by the data?
A) accelerating B) critical C) recollapsing D) coasting Refer to this scenario for the following questions: A multi-dimensional being reaches down to Earth and pulls you out of the universe. You are then thrown back into the universe at a place and time of the being's choosing, and you are permitted to leave only after you have identified your surroundings. This process is repeated several times. Through a scientifically unexplainable miracle, you are able to survive in every one of the places that you find yourself. In each scenario below, identify your surroundings (and potentially your cosmic era) from among the choices given.
In our location in the Milky Way, the galactic disk is only about ________ ly thick
A) 10 B) 100 C) 1,000 D) 10,000 E) 100,000
The charge per unit length on an insulator is 6.2 ?C/m. On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are 7.8 × 10^13 more electrons than protons. b. There are 7.8 × 10^13 more protons than electrons. c. There are 3.9 × 10^13 more protons than electrons. d. There are 3.9 × 10^13 more electrons than protons.
A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The power factor, cos ?, is
a. ?1.00. b. ?0.749. c. +0.749. d. +0.834. e. +1.00.