Which of the following is true of the central bulge in the Milky Way?
A) It is a slightly flattened spheroid.
B) It is a part of the disk component of the galaxy.
C) It consists of spiral arms.
D) It is a highly active region for star formation.
A
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A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the opposite direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.
One "food calorie" equals
a. 1 calorie. b. 100 calories. c. 1000 calories. d. none of the above.
A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
A. 10 m/s; 9.8 m/s2. B. 9.0 m/s; 9.8 m/s2. C. 9.0 m/s; 9.0 m/s2. D. 1.0 m/s; 9.0 m/s2. E. 1.0 m/s; 9.8 m/s2.
Both line emission and line ______________ spectra are characteristic for a specific element
Fill in the blank(s) with correct word