The redshift of the galaxies is correctly interpreted as:
A) a Doppler shift due to the random motions of galaxies in space.
B) an aging of light as gravity weakens with time.
C) space itself is expanding with time, so the photons are stretched while they travel through space.
D) placing our Galaxy near the center of the Local Group.
E) the differences in temperatures and star formation in old and young galaxies.
C
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The planets of the solar system were formed
a) as condensations/accretions of hot gases ejected from the Sun b) by the accumulation of many comets c) by a near collision between the Sun and a nearby star d) as individual condensation/accretion centers in a rotating solar nebula e) by the collapse of a single higher mass star into a black hole
Mass on a Spring: An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its elastic potential energy is a maximum?
A. at either A or B B. midway between A and B C. one-third of the way between A and B D. one-fourth of the way between A and B E. at none of these points
The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 × 106 V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?
What will be an ideal response?
Explain the difference between force and torque