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strojnjashka [21]
2 years ago
12

Please need help for this one

Physics
1 answer:
Advocard [28]2 years ago
8 0
C and E ..............
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Which is true regarding AC current? The electrons move back and forth. The +/- polarity is constant. It is common in portable de
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Answer: Option (a) is the correct answer.

Explanation:

AC current stands for alternating current. In an alternating current there is periodically reverse movement of current.

This means electrons move in one direction for a certain time and then they reverse their movement for the same time period and it continues in the back and forth position.

Thus, we can conclude that the statement electrons move back and forth is true regarding AC current.


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A student has a small piece of steel.
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There are different ways to investigate density. In this required practical activity, it is important to:

record the mass accurately

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Which resource would be the best choice to learn more information about studying martial arts?
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2 years ago
A car with a mass of 3 Kg and velocity of 40 m/s collided with a truck of a velocity of 60 m/s, if the momentum is conserved wha
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the mass of the truck is 2 kg.

Explanation:

Given;

mass of the car, m₁ = 3 kg

initial velocity of the car, u₁ = 40 m/s

initial velocity of the truck, u₂ = 60 m/s

let the mass of the truck = m₂

Apply the principle of conservation of linear momemtum;

m₁u₁ = m₂u₂

m₂ = (m₁u₁) / u₂

m₂ = (3 x 40) / (60)

m₂ = 2 kg

Therefore, the mass of the truck is 2 kg.

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3 years ago
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