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4vir4ik [10]
2 years ago
15

Which statement best defines an electric field?

Physics
1 answer:
stich3 [128]2 years ago
3 0

Answer:

D

Explanation:

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Answer:

a)

N_{top}=9.8N\\N_{bottom}=33.4N

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Explanation:

The net force on the car must produce the centripetal acceleration necessary to make this circle, which is a_{cp}=\frac{v^2}{R}. At the top of the circle, the normal force and the weight point downwards (like the centripetal force should), while at the bottom the normal force points upwards (like the centripetal force should) and the weight downwards, so we have (taking the upwards direction as positive):

-m\frac{v^2}{R}=-N_{top}-mg\\m\frac{v^2}{R}=N_{bottom}-mg

Which means:

N_{top}=m\frac{v^2}{R}-mg=(1.2kg)\frac{(6m/s)^2}{2m}-(1.2kg)(9.8m/s^2)=9.8N\\N_{bottom}=m\frac{v^2}{R}+mg=(1.2kg)\frac{(6m/s)^2}{2m}+(1.2kg)(9.8m/s^2)=33.4N

The limit for falling off would be N_{top}=0, so the minimum speed would be:

0=m\frac{v_{min}^2}{R}-mg\\v_{min}=\sqrt{Rg}=\sqrt{(2m)(9.8m/s^2)}=4.4m/s

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V = m1 u1 - m2 u2 / m1
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Why do circuits need to maintain a closed loop?
ivann1987 [24]

Answer:

A closed circuit, for most intents and purposes, is one which carries electrons at high voltage through a load and releases them to an area of lower voltage. An open circuit is any circuit with a resistance sufficient to reduce the current to below any meaningful amount

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