You observe a distant galaxy. You find that a spectral line normally found in the visible part of the spectrum is shifted toward the infrared. What do you conclude?
A) The galaxy is moving away from you.
B) The galaxy is moving toward you.
C) The galaxy has very weak gravity.
D) The galaxy is made purely of hydrogen.
E) The composition of the galaxy is changing.
A
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A coil lies flat on a tabletop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?
A) There is no induced current in this coil. B) The induced current flows clockwise. C) The induced current flows counterclockwise. D) The current flows clockwise initially, and then it flows counterclockwise before stopping.
If the activity of a sample of 232Th decreases from 1000 cpm to 500 cpm in 60 min, in another 60 min its activity will be
a. 500 cpm. b. 0 cpm. c. 250 cpm. d. 125 cpm.
A charge of +80 ?C is placed on the x axis at x = 0 . A second charge of ?50 ?C is placed on the x axis at x = 50 cm. What is the magnitude of the electrostatic force on a third charge of 4.0 ?C placed on the x axis at x = 30 cm?
a. 13 N b. 77 N c. 39 N d. 25 N e. 45 N
ROI stands for return-on-investment.
Answer the following statement true (T) or false (F)