What explanation does general relativity provide for gravity?
A) Gravity is the result of curved spacetime.
B) Gravity is directly proportional to the mass of the attracting body.
C) Gravity is inversely proportion to the radius of the body.
D) Gravity is the opposite of the electromagnetic force.
E) Gravity can affect only massive particles, not massless photons.
A
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RLC Circuits: The figure shows a series ac circuit. The inductor has a reactance of 50 ? and an inductance of 220 mH. An 80-? resistor and a capacitor whose reactance is 160 ? are also in the circuit, and the rms current in the circuit is 2.2 A. What is the voltage amplitude across the capacitor?
A. 390 V B. 330 V C. 270 V D. 220 V E. 190 V
Which is the process that explains how life adapts itself to a changing environment?
a. biological evolution b. environmental duplication c. biological transformation d. natural selection e. genetic reproduction
When a barrel of water in a rowboat in a swimming pool is poured overboard, the pool level
A) rises. B) falls. C) remains unchanged.
Even though Titan has liquid methane on its surface, some internal heat, and plenty of carbon-containing compounds, it is not a suitable place for life because
A) Titan orbits within Saturn's radiation belt so its surface is completely sterilized by high-energy particles B) there is too much volcanic activity on the surface C) it has no ozone layer to protect the surface from harmful UV rays from the Sun D) it is far too cold, and methane is not a very good biological solvent