Which contributes more to the cost of your electric bill each month, a 1500-Watt hair dryer or a 600-Watt microwave oven?
a) hair dryer
b) microwave oven
c) both contribute equally
d) depends upon what you cook in the oven
e) depends upon how long each one is on
Ans: e) depends upon how long each one is on
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Explain the "Lighthouse Model" of pulsars
What will be an ideal response?
Blackbody radiation is caused by an object's ____
a. chemical structure b. binding energy c. excitation level d. absolute zero e. thermal agitation
A 6.0-?F air-filled capacitor is connected across a 100-V potential source (a battery). After the battery fully charges the capacitor, it is left connected and the capacitor is immersed in transformer oil, which has a dielectric constant of 4.5
How much additional charge flows from the battery onto the capacitor during this process? A) 1.2 mC B) 2.1 mC C) 2.5 mC D) 1.7 mC
According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on the Earth?
A) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth. B) Early life did not release oxygen, and oxygen releasing organisms didn't evolve for a billion years after the earliest life. C) Oxygen was removed from the atmosphere by dissolving in the ocean as quickly as it was released by life. D) Oxygen was removed from the atmosphere by chemical reactions with surface rocks as quickly as it was released by life.