If you focus a store-bought telescope at the full Moon on a typical clear night, the full Moon will be viewed as _________________
a. right-side up b. upside down
c. a dot in the sky d. the color red
b
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After an elastic collision of two balls, the kinetic energies of the two balls are measured to be 12 J and 24 J. What can be said about the kinetic energy of the two balls before the collision?
a. nothing—not enough information is given b. the balls had the same energies, 12 J and 24 J, respectively c. the total kinetic energy of the two balls was 36 J d. none of the above
What is the kinetic energy of a 120-cm thin uniform rod with a mass of 450 g that is rotating about its center at 3.60 rad/s?
A) 0.350 J B) 4.20 J C) 0.700 J D) 0.960 J E) 2.10 J
A point charge +Q is located on the x axis at x = a, and a second point charge ?Q is located on the x axis at x = ?a. A Gaussian surface with radius r = 2a is centered at the origin. The flux through this Gaussian surface is
A. zero because the negative flux over one hemisphere is equal to the positive flux over the other. B. greater than zero. C. zero because at every point on the surface the electric field has no component perpendicular to the surface. D. zero because the electric field is zero at every point on the surface. E. none of the above.
An object of mass m is attached to a spring of spring constant k and it is pulled so that it starts to oscillate at its natural frequency f. Now the spring is cut in half and the experiment is repeated. What will be the new frequency of vibration?
1. f 2. f/?2 3. f?2 4. 2f