Answer:
15 N
Explanation:
The magnetic force on a piece of current-carrying wire is given by:

where
I is the current in the wire
L is the length of the piece of wire
B is the magnetic field strength
is the angle between the direction of B and I
In this problem:
I = 10 A
B = 0.3 T
L = 5 m

Substituting into the equation, we find

The spring has been extended for 3.5 m
<u>Explanation:</u>
We have the formula,
PE =1/2 K X²
Rewrite the equation as
PE=1/2 K d²
multiply both the sides by 2/K to simplify the equation
2/k . PE= 1/2 K d² . 2/K
√d²=√2PE/K
Cancelling the root value and now we have,
d=√2PE/k
d=√2×98 J / 16N/m
d=√12.25
d=3.5 m
The spring has been extended for 3.5 m
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The acceleration of a car with the mass of 1,980kg with a net horizontal force of 1,000 N is 0.51m/s².
<h3>HOW TO CALCULATE ACCELERATION?</h3>
The acceleration of a body can be calculated using the following formula:
a = F ÷ m
Where;
- a = acceleration (m/s²)
- F = Force (N)
- m = mass (kg)
According to this question, a car has a mass of 1980kg and horizontal force of 1000N. The acceleration is as follows:
a = 1000/1980
a= 0.51m/s²
Therefore, the acceleration of a car with the mass of 1,980kg with a net horizontal force of 1,000 N is 0.51m/s².
Learn more about acceleration at: brainly.com/question/12134554
Gravitational force of attraction between two objects can be calculated from the following formula:

Where m with subscript stands for mass of the object and r is the distance between them.
When we double the mass of those two objects, distance between them stays the same, while in the numerator we have:

When numerator in the second case 4 times greater than the 'original' numerator and denominator stays the same, force becomes 4 times greater.