Light from an object near the event horizon received by a distant observer is ________
Fill in the blank(s) with correct word
redshifted
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How much energy is necessary to place three +2.0-µC point charges at the vertices of an equilateral triangle of side 2.0 cm if they started out extremely far away? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 4.5 J B) 5.4 J C) 6.7 J D) 7.6 J
A child is standing at the rim of a freely rotating disk holding a rock. The disk rotates without friction. The rock is dropped at the instant shown. As a result of dropping the rock, what happens to the angular velocity of the child and disk?
Stars spend about 90% of their lifetime on the main sequence
Indicate whether the statement is true or false
Electromagnetic waves with a wavelength of about 0.1 nm (about the size of an atom) are in which range?
A. Radio B. Microwave C. Infrared D. Visible E. Ultraviolet F. X-ray T. Gamma ray