How do the two factors (mass and distance) in Newton's law of gravitation each affect the force on the two bodies?
What will be an ideal response?
The greater the masses of the two bodies, the larger their gravity. The farther apart the bodies, the weaker this force, by the inverse square of this distance.
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How is the age of the galaxy determined?
a. Measuring the metallicity of Population II stars. b. Finding the turnoff point in the H-R diagram of globular clusters. c. From the motion of stars in the galactic halo. d. Counting the number of open clusters in the spiral arms.
The fundamental frequency of HF is 8.72 × 10^13 Hz. The energy associated with a transition from the 10th to the 9th vibrational quantum number (in eV) is
a. 3.61 b. 0.361 c. 0.060 5 d. 0.605 e. 0.182
Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points directly away from the nearest point on the y axis and has a magnitude that depends only on r, the distance to that nearest point. For which of the gaussian surfaces listed, would it be easiest to calculate the net flux of the electric field through that surface?
A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis.
B. A spherical surface.
C. A cylindrical can-like surface oriented with its central axis perpendicular to the y axis.
D. A cylindrical can-like surface oriented with its central axis parallel to the y axis.
E. A cone-like surface oriented with its central axis parallel to the y axis.
If the current density in a wire or radius R is given by J = kr, 0 < r < R, what is the current in the wire?
A) 2?kR3/3 B) 3?kR3/2 C) kR3/3 D) kR2 E) kR2/2