A 100-W lamp glows brighter than a 25-W lamp. The current drawn by the 100-W lamp is
A) less.
B) greater.
C) the same.
Answer: B
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If you were on the Moon during a total lunar eclipse, the Sun would be hidden behind Earth
a. True b. False Indicate whether the statement is true or false
Two cyclists who weigh the same and have identical bicycles ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob
Ignoring friction and wind resistance, which one of the following statements is true? A) The amount of work done by Joe is equal to the amount of work done by Bob, but the average power exerted by Joe is greater than that of Bob. B) The amount of work done by Joe is greater than the amount of work done by Bob, and the average power exerted by Joe is greater than that of Bob. C) Bob and Joe exerted the same amount of work, and the average power of each cyclist was also the same. D) The average power exerted by Bob and Joe was the same, but Joe exerted more work in getting there.
Our Sun will likely undergo a nova event in about 5 billion years
Indicate whether the statement is true or false
If I0 = 10-12 W/m2 is the threshold of hearing, a sound with intensity I1 = 10-10 W/m2 will give a certain decibel level. Suppose a new sound has an intensity I2 = I12/I0 . What is the new decibel level?
a. 40 c. 10,000 b. 20 d. It will square the decibel level.