Which describes our understanding of flowing water on Mars?
a. It was never important.
b. It was important once, but no longer.
c. It is a major process on the Martian surface today.
Answer : b. It was important once, but no longer.
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What is true about Antares?
A: name means "Rival of Mars" B: ˜700 times the size of the Sun C: possibly egg-shaped D: cooler than the Sun E: all of the above
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?
Astronomy and astrology were often practiced together in ancient cultures, and astrology played an important role in the historical development of astronomy
Indicate whether the statement is true or false
An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 10^4 V before it hits the target. What is the kinetic energy of the electron in electron volts?
1.1.00 × 10^4 eV 2.1.60 × 10^-15 eV 3.1.60 × 10^-22 eV 4.6.25 × 10^22 eV 5.1.60 × 10^-19 eV