What does cosmological redshift do to light?
A) stretches its wavelength
B) makes it brighter
C) makes it slow down
D) makes all light infrared
A) stretches its wavelength
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Forces that are equal in size and opposite in direction are known as
a. balanced forces b. net forces c. friction forces d. accelerated force
Marcia places a lead block and an iron block on the table, and hits both of them with the same force. The lead block is twice as massive as the iron block. The acceleration of the lead block is
A) half that of the iron block. B) a quarter of that of the iron block. C) equal to that of the iron block. D) two times that of the iron block. E) four times that of the iron block.
Two kilograms of water at 100°C is converted to steam at 1 atm. Find the change in internal energy (in J). (Lv = 2.26 × 10^6 J/kg.)
a. 2.1 × 10^4 b. 4.5 × 10^6 c. 3.4 × 10^5 d. 4.2 × 10^6 e. 2.1 × 10^6
Some massive stars only live a few million years
a. True b. False Indicate whether the statement is true or false