In the formula E=mc2, what does E represent?
A) the mass-energy, or potential energy stored in an object's mass
B) the kinetic energy of a moving object
C) the radiative energy carried by light
D) the gravitational potential energy of an object held above the ground
A
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The gas motions within granules on the solar surface are
a. upward in the centers of some cells and downward in others; the gas cools as it passes between individual granules. b. actually motionless. The dark regions are absorption features from gases in the photosphere. c. upward in the bright cell centers and downward around the darker edges. d. downward in the bright cell centers and upward around the darker edges.
Describe the physical significance of thermal conductivity.
What will be an ideal response?
Spherical Mirrors: A concave spherical mirror has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image located?
A. 20 cm behind the mirror B. 20 cm in front of the mirror C. 6.7 cm behind the mirror D. 6.7 cm in front of the mirror
Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, two seconds later the rock's speed is
A) zero. B) 5 m/s. C) 10 m/s. D) 15 m/s. E) none of the above