A windmill is example of a a.generator 
b.resistor 
c.insulator
d.motor

To find the force on the block, use Newton #1:  F = m A

Force = (2.3 kg) x (0.27 m/s²)

Force = (2.3 x 0.27) kg-m/s²

Force = 0.621 Newton

The spring stretches 1 meter when to pull with 18 N of force.

To pull with only 0.621 N of force, it only has to stretch (0.621/18) of a meter.  That's 0.0345 meter, or 3.45 cm .

When the separation between two masses is doubled, the gravitational force between them decreases by 4.

What is meant by gravitational force ?

Gravitational force is defined as the force of attraction experienced by a body due to the gravity of earth.

Here,

The separation between two masses is doubled.

That means the distance, r₂ = 2r₁

We know that the equation of gravitational force is given by,

F = GMm/r²

where G is the gravitational constant

From the equation, we know that the gravitational force obeys the inverse square law.

That means the gravitational force is inversely proportional to the square of the distance between the masses.

So, F 1/r²

Therefore,

F₂/F₁ = (r₁/r₂)²

F₂ = F₁(1/2)²

F₂ = F₁/4

Hence,

When the separation between two masses is doubled, the gravitational force between them decreases by 4.

To learn more about gravitational force, click:

brainly.com/question/24783651

#SPJ3

Answer:

increase by a factor of 4.

Explanation:

If the separation distance between two objects is doubled (increased by a factor of 2), then the force of gravitational attraction is decreased by a factor of 4 (2 raised to the second power).

Answer:

c

Explanation:

The power rating on the motor is the maximum power it's ABLE to deliver. It can run with LESS power output than the rating, but if you try to run it with MORE than it's rated, the motor will overheat and eventually burn out.

" 10 watts " means " 10 Joules of enrgy per second ".

If the motor is operated at its full maximum rated capacity, then

(500 joules) / (10 joules/sec) = 50 seconds