An ideal spring with a force constant (spring constant) of 15 N/m is initially compressed by 3.0 cm from its uncompressed position. How much work is required to compress the spring an additional 4.0 cm?
A) 0.024 J B) 0.030 J C) 0.012 J D) 0.0068 J
B
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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.
The figure shows a cross section of three parallel wires each carrying a current of 5.0 A out of the paper. If the distance R = 6.0 mm, what is the magnitude of the magnetic force on a 2.0-m length of any one of the wires?
a.
2.5 mN
b.
3.3 mN
c.
2.2 mN
d.
2.9 mN
e.
1.7 mN
For an oxide to be protective, the ratio of the volume of the oxide formed to the volume of the metal atoms that formed the oxide should be approximately _________.
Fill in the blank(s) with the appropriate word(s).
What is the origin of the lobes often observed on opposite sides of radio galaxies?
A. black holes orbiting the center B. high-speed electrons spiraling around magnetic field lines C. supernovae from massive stars D. gas ejected from the core of the galaxy E. hot planetary nebulas surrounding the galaxy