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3 years ago

A crane lifts a car with 9023 J of kinetic energy. The crane lifts the car with a speed

Physics

1 answer:

lapo4ka [179]3 years ago

4 0

Answer:

m = 2301.8 [kg]

Explanation:

This problem can be solved in an easy way using the definition of kinetic energy, in this way you can clear the mass, depending on the known variables.

$E_{k}=0.5*m*v^2\\replacing\\\\9023 = 0.5 *m*(2.8)^2\\m = 2301.8[kg]$

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Explanation:

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Therefore, the option (b) Electric field is zero but potential is not zero is an incorrect solution

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Answer:

proportional to the current in the wire and inversely proportional to the distance from the wire.

Explanation:

The magnetic field produced by a long, straight current-carrying wire is given by:

$B=\frac{\mu_0 I}{2 \pi r}$

where

$\mu_0$ is the vacuum permeability

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r is the distance from the wire

From the formula, we notice that:

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Therefore, correct option is

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