Answer: 1: kinetic energy and velocity are at zero when the magnets are held apart, and both increases rapidly when they are released and move together. Energy stored in the magnetic field decreases.
2: The energy stored in the system is converted to kinetic, thermal, and sound energy.
3: The energy stored in the magnetic field does not change.
4: Some of the energy stored is converted into kinetic and thermal energy.
5: Two small repelling magnets hold each other in place.
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Answer:
B. 36 lb
Explanation:
m = 160/9.8 = 16.3 kg
16.3 kg ( 2.205 lb/kg) = 36 lb
The force of friction is zero.
Using F = m a = the force needed is 6 N which means no friction can be acting.
Answer: H
Explanation:
When beavers dam a stream they slow the movement of water. Behind the beaver dam, a pond of still water is formed. This pond is then colonized by animals and plants that typically live in lakes rather than streams.
Answer: 62.25
Explanation: F = ma
F = 7.5 * 8.3
F = 62.25
Thus, the answer is 62.25 Newtons.
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