Which of the following paraphrases Hubble's Law?
A) The faster the galaxy spins, the more massive and luminous it is.
B) The greater the distance to a galaxy, the greater its redshift.
C) The greater the distance to a galaxy, the fainter it is.
D) The more distant a galaxy is, the younger it appears.
E) The older the galaxy appears to us, the more luminous it is.
B
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What is an atmospheric window?
A. a region in the atmosphere where light can get through B. a part of the upper atmosphere with depleted ozone C. a region in the atmosphere where infrared radiation can penetrate D. a range of wavelengths of electromagnetic radiation which transmit through Earth's atmosphere
A 200-N object floats with three-fourths of its volume beneath the surface of the water. What is the buoyant force exerted by the water on the object? The density of water is 1000 kg/m3
A) 50 N B) 150 N C) 200 N D) 267 N E) It cannot be determined because we do not know the volume of the object.
A standing wave is set up in a 100-cm string fixed at both ends. The string vibrates in 5 distinct segments when driven by a 120-Hz source. What is the wavelength?
a. 10 cm c. 40 cm b. 20 cm d. 80 cm
A pair of 1-ohm resistors connected in series has a combined resistance of
A) 1 ohm. B) 2 ohms. C) 1/2 ohm. D) none of the above