A60 w lightbulb is on for 24 hours. a stereo with a power of 150 w is on for 2
hours. which statement correctly compares the energy used by these
devices?
o
a. they use the same amount of energy.
o
b. the lightbulb uses 4,104,000 j more than the stereo.
o
c. the lightbulb uses 2,080,000 j less than the stereo
o
d. the lightbulb uses 5,184,000 j more than the stereo.
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Aspring with a mass of 2 kg has a damping constant 14 kg/s. a force of 3.6 n is required to keep the spring stretched 0.3 m beyond its natural length. the spring is stretched 0.6 m beyond its natural length and then released. find the position of the mass at any time t. (assume that movement to the right is the positive x-direction and the spring is attached to a wall at the left end.)

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.