A creature that is scaled up in size, keeping its proportions,
A) will be stronger relative to its greater weight.
B) will be weaker relative to its greater weight.
C) both of these
D) neither of these
Answer: B
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Molecular Speeds: The root-mean-square speed of the molecules of an ideal gas is v. The gas is now slowly compressed to one-half its original volume with no change in temperature. What is the root-mean-square speed of the molecules now?
A. 4v
B. 2v
C. v/
D. v
E. v/2
Which of the following processes slowed the collapse of protogalactic clouds?
A) the conversion of gravitational potential energy into kinetic and thermal energy as the cloud collapsed B) the formation of the first generation of stars C) the shock waves from the exploding supernovae of the earliest stars D) the pull of gravity of the mass of the cloud material E) the radiating away of thermal energy
Which of the following changes will increase the capacitance of a parallel-plate capacitor? (There could be more than one correct choice.)
A) increase the charge on the plates B) decrease the potential between the plates C) increase the potential between the plates D) introduce a dielectric material between the plates E) decrease the separation between the plates
A particle (m = 50 g, q = 5.0 ?C) is released from rest when it is 50 cm from a second particle (Q = ?20 ?C). Determine the magnitude of the initial acceleration of the 50-g particle
a. 54 m/s2 b. 90 m/s2 c. 72 m/s2 d. 65 m/s2 e. 36 m/s2