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3 years ago

What happens when an object transfers energy?

1 answer:

5 0

Energy is transferred from one object to another when a reaction takes place. Energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. For the blue ball to move to the position of the green ball, energy must be given to the blue ball. This energy would be in the form of motion, with the person lifting the blue ball to a higher level. This form of energy is called kinetic energy.

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Two electrons exert a force of repulsion of 1.2 N on each other. How far apart are they? The elementary charge is 1.602 × 10−19

sergejj [24]

The distance between the charges is 13.86 X 10⁴m

Explanation:

Given:

Force, F = 1.2N

Charge, q₁ = 1.602 X 10⁻¹⁹ C

k = 8.987 X 10⁹ Nm²/C²

Distance, d = ?

According to Coulomb's law:

$F = k\frac{q_1q_2}{r^2} \\\\$

Substituting the value in the formula we get:

$1.2 = 8.987X 10^9 X\frac{1.602 X 10^-^1^9 X 1.602 X 10^1^9}{r^2} \\\\1.2 = \frac{23.06 X 10^9}{r^2} \\\\r^2 = 19.22 X 10^9\\\\r = 13.86 X 10^4m$

Therefore, the distance between the charges is 13.86 X 10⁴m

5 0

3 years ago

Two people push on a boulder to try to move it. The mass of the boulder is 815 kg. One person pushes north with a force of 65 N.

ivanzaharov [21]

Answer:

$0.095 m/s^2$

Explanation:

As the 2 force directions are perpendicular (North vs West), we can calculate the magnitude of the net force using the following equation

$F = \sqrt{65^2 + 42^2} = 77.4 N$

Assuming negligible friction, from here we can calculate the acceleration in accordance to Newton's 2nd law of motion

$a = F/m = 77.4 / 815 = 0.095 m/s^2$

3 0

3 years ago

Which material would result in the greatest amount of energy transfer? An absorber that is dark in color and rough. A reflector

WINSTONCH [101]

Answer:

the answer is d

Explanation:

basically the reason i think this is the answer is because the answer that i picked in this scenario to me seems like the right one and it it the one i picked on the quiz that seemed like the right one to me and i am smart and cool and awesome

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5 0

3 years ago

Read 2 more answers

What is the difference in mass between the smaller nuclei that fuse together and the newly formed heavier nucleus called?

baherus [9]

Answer:

ESTA!!!

Explanation:

3 0

3 years ago

A supply plane needs to drop a package of food to scientists working on a glacier in greenland. the plane flies 100 m above the

pishuonlain [190]

The package should be dropped 678 m short of the target.

A package dropped from a plane which is moving at a speed v, has a horizontal velocity equal to the horizontal velocity of the plane. It has a parabolic trajectory, traversing a horizontal range x while it falls through a vertical height y.

The package has no initial vertical velocity, and it falls through a height y under the action of the acceleration due to gravity g.

Use the equation,

$y=\frac{1}{2} gt^2$

Write an expression for t, the time taken for the package to fall through y.

$t^2=\frac{2y}{g}$

Substitute 100 m for y and 9.81m/s² for g.

$t^2=\frac{2y}{g}\\ =\frac{2(100m)}{9.81m/s^2} \\ =20.39s^2\\ t=4.52s$

In the time t the package travels a horizontal distance x. The horizontal velocity of the package remains constant, since no force acts along the horizontal direction.

Therefore, the horizontal distance traveled by the package is given by,

$x=vt\\ =(150m/s)(4.52s)\\ =678m$

If the package is released 678m before the target, the package would reach the scientists working in Greenland.

6 0

4 years ago