A hoop (I = MR2) is rolling along the ground at 10 m/s. It comes to a hill and starts going up. Assuming no losses to friction, how far does it travel vertically up the hill before it stops?
a. 10 m b. 3.7 m
c. 5.1 m d. 7.7 m
a
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Heat will not be transferred between two bodies that are at the same ________.
Fill in the blank(s) with the appropriate word(s).
Equal but opposite charges Q are placed on the square plates of an air-filled parallel-plate capacitor
The plates are then pulled apart to twice their original separation, which is small compared to the dimensions of the plates. Which of the following statements about this capacitor are true? (There may be more than one correct choice.) A) The energy stored in the capacitor has doubled. B) The energy density in the capacitor has increased. C) The electric field between the plates has increased. D) The potential difference across the plates has doubled. E) The capacitance has doubled.
The rate of a chemical reaction would be increased by
a. increasing the surface area of the reactants. b. increasing the concentration of the reactants. c. adding a catalyst to the reactants. d. heating the reactants. e. all of the above.
A charge of 8.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm), and a second charge of ?3.0 pC is distributed uniformly on a concentric spherical surface (radius = 4.0 cm). Determine the magnitude of the electric field 5.0 cm from the center of the two surfaces
a. 14 N/C b. 11 N/C c. 22 N/C d. 18 N/C e. 40 N/C