Radio telescopes allow us to observe objects that are too cold to emit strongly in the visible part of the spectrum. Astronomers still use images of these object for study. What kind of images are these?
A. black-and-white images
B. false-color images
C. artist's renditions
D. holographic images
E. Astronomers do not use images to study radio objects.
Answer: B
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Europa is located outside the Sun's habitable zone and yet may be habitable. How can this be?
A) Europa's subsurface ocean contains lots of minerals that allow water to remain liquid at much lower temperatures B) Europa is continually being hit by comets and asteroids which keeps water beneath its surface liquid C) Europa is tidally heated, allowing liquid water to exist beneath its icy surface D) Europa is large enough to have appreciable heat trapped inside it to keep water beneath the surface liquid
An uncharged 30.0-µF capacitor is connected in series with a 25.0-? resistor, a DC battery, and an open switch. The battery has an internal resistance of 10.0 ? and the open-circuit voltage across its terminals is 50.0 V
The leads have no appreciable resistance. At time t = 0, the switch is suddenly closed. (a) What is the maximum current through the 25.0-? resistor and when does it occur (immediately after closing the switch or after the switch has been closed for a long time)? (b) What is the maximum charge that the capacitor receives? (c) When the current in the circuit is 0.850 A, how much charge is on the plates of the capacitor?
For a given value of Hubble's constant, how does the age of the universe depend on the overall density of the universe?
What will be an ideal response?
Most stars are single stars like our Sun
Indicate whether the statement is true or false