When a crate of mass m is dragged a distance d along a surface with coefficient of kinetic friction mk, then dragged back along the same path to its original position, the work done by friction is
a. 0.
b. -mkmgd. c. +mkmgd. d. -2mkmgd. e. +2mkmgd.
D
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Describe how the observable properties of the solar system are related to its process of formation
What will be an ideal response?
The resistance of a filament that carries 2 A when a 10-V potential difference across it is
A) 2 ohms. B) 5 ohms. C) 10 ohms. D) 20 ohms. E) more than 20 ohms.
Which of the following sequences correctly describes the stages of life for a low-mass star?
A) protostar, red giant, main-sequence, white dwarf B) protostar, main-sequence, white dwarf, red giant C) white dwarf, main-sequence, red giant, protostar D) protostar, main-sequence, red giant, white dwarf E) red giant, protostar, main-sequence, white dwarf
Which of the following are vectors?
(i) your age (ii) your height (iii) acceleration (iv) velocity (v) speed (vi) mass
1.(iii) and (iv) 2.(iii), (iv), and (v) 3.(i), (ii), and (vi) 4.all of these