Answer:
t = 0.28 seconds
Explanation:
Given that,
Force acting on a firework, F = 700 N
The momentum of the firework, p =200 kg-m/s
We need to find the time before it explodes. Ket the time be t. We know that, the rate of change of momentum is equal to external frce. So,
So, the required time is equal to 0.28 seconds.
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Nothing happens to the brightness of the light bulbs in the parallel circuit if the power supply is capable of supplying the additional current.
The car would take 20 seconds to go 1000 meters. This can be found by dividing 1000 by 50.
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The negatively charged rod cause charge migration within the penny. So, the protons and electrons in the penny move to seperate sides of the penny with the protons on the side closest to the iron ball. Then the penny could have been touched by a person or another object to ground the penny, removing the excess electrons in the penny. This is called charging by induction. So after grounding, the penny becomes positively charged. Opposite charges attract
The movement of the molten rocks underneath the plates
