The Local Group is slightly more than _____ in diameter
A) 1 Mpc
B) 2 Mpc
C) 3 Mpc
D) 4 Mpc
A
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This diagram shows several stages in a computer simulation of a collision between two galaxies. What is being simulated?
A) Two spiral galaxies merge to become an elliptical galaxy surrounded by debris. B) Two elliptical galaxies merge to become a spiral galaxy. C) Two galaxies collide, sending their stars flying off into space while their centers merge to become a supermassive black hole. D) Two spiral galaxies collide, ultimately merging to make a larger spiral galaxy.
A grating is to be used to find the wavelength of the emission spectrum of a gas. The grating spacing is not known,
but light of a known wavelength of 632.8 nm is deflected by 43.2° in the second order by this grating. Light of the wavelength to be measured is deflected by 34.9° in the second order. What is the wavelength of the light that is to be measured?
An incredibly dense star so massive that light cannot escape from its surface is called a _______________
a. red giant b. black hole c. white dwarf d. pulsar
The water level in a reservoir is maintained at a constant level. What is the exit velocity in an outlet pipe 3.0 m below the water surface?
a. 2.4 m/s b. 3.0 m/s c. 5.4 m/s d. 7.7 m/s e. 49 m/s