What is the approximate diameter of the roundish region with a temperature of 300—500 K?
This frame from Figure 16.12 is from a supercomputer model of the formation of one of the first stars in the universe. Color indicates gas temperature: Blue and green represent cool gas (100—300 K), orange and red represent warm gas (500—3000 K), and yellow represents gas at intermediate temperatures (300—500 K). Use the information in the figure to answer the following questions.
Answer: About 1000 light-years
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In what direction does Uranus orbits the Sun?
A. It orbits the Sun in the opposite direction as the other planets. B. It orbits the Sun in the same direction as the other planets.
A transformer is to be designed to increase the 27-kV (rms) output of a generator to the transmission line voltage of 346 kV (rms). If the primary winding has 95 turns, how many turns must the secondary have?
a. 7 b. 15600 c. 1217 d. 26 e. 4358
Boltzmann's constant, kB, may be derived as a function of R, the universal gas constant, and NA, Avogadro's number. Which expresses the value of kB?
a. NAR2 b. NAR c. R/NA d. NA/R
A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30° below the horizontal just before it strikes a horizontal surface. The ball leaves this surface 0.50 s later with a velocity of 2.0 m/s directed 60° above the horizontal. What is the magnitude of the average resultant force on the ball?
a. 14 N b. 11 N c. 18 N d. 22 N e. 3.0 N