The binding energy of a molecule
A)
is the negative of the activation energy.
B)
cannot be negative if a molecule is formed.
C)
must be negative if a molecule is formed.
D)
can be negative if a molecule is formed.
E)
must be positive if the molecule is formed.
D
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When a mass of 0.350 kg is attached to a vertical spring and lowered slowly, the spring stretches 12.0 cm. The mass is now displaced from its equilibrium position and undergoes simple harmonic oscillations. What is the period of the oscillations?
A) 0.695 s B) 0.483 s C) 0.286 s D) 0.0769 s E) 1.44 s
A wooden raft has a mass of 55 kg. When empty it floats in water (density with 64% of its volume submerged. What maximum mass of sand can be put on the raft without sinking it?
What will be an ideal response?
Evidence that there is a considerable amount of water frozen under the surface of Mars is provided by all of the following except
A. satellite measurements of water in the polar caps. B. discovery by the Mars rovers of chemicals in surface rocks formed in the presence of large amounts of water. C. squishy-looking flow patterns around crater impact sites. D. features resembling channels cut by flowing water. E. periodic eruptions of geysers when subsurface ice is melted by volcanic activity.
Household 120-V outlets are made to accept three-pronged plugs. One of the prongs attaches to the "live" wire at 120 V, and another attaches to the "neutral" wire that is connected to ground. What is the round third prong for?
a. It serves as a backup to the hot wire. b. Nothing electrical, it is for mechanical sturdiness. c. It connects the case of the appliance directly to ground for safety purposes. d. It lets the appliance run if the neutral wire breaks.