A typical galaxy like our Milky Way galaxy contains
a. primarily planets.
b. gas only.
c. stars (some with planets), gas, and dust.
d. a single star and planets.
e. thousands of superclusters.
c
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The observed composition of ordinary matter in the universe—roughly 75 percent hydrogen and 25 percent helium—closely matches theoretical predictions based on the Big Bang model
Indicate whether the statement is true or false
The electric field in the region defined by the y-z plane and the positive x axis is given by E = ax, where a is a constant. (There is no field for negative values of x.) As x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
A. a decreasing function proportional to ?|x2|. B. a decreasing function proportional to ?|x|. C. constant. D. an increasing function proportional to +|x|. E. an increasing function proportional to +|x2|.
An 90-kg satellite orbits a distant planet with a radius of 4000 km and a period of 280 min. From the radius and period, you calculate the satellite's acceleration to be 0.56 m/s2. What is the gravitational force on the satellite?
A. 50.4 N B. 90 N C. 720 N D. 12,000 N
The silver lining on the glass surfaces of a Thermos bottle reduces energy that is transferred by
A) conduction. B) convection. C) radiation. D) friction. E) none of the above