Answer:
618.03 J
Explanation:
Potential energy can be calculate using the following formula.
PE=m*g*h
where m is the mass, g is the acceleration due to gravity and h is the height.
In this situation, we have a 3 kilogram rock on a 21 meter high cliff. Therefore, the mass is 3 kg and the height is 21 m.
On Earth, the acceleration due to gravity is 9.81 m/s^2.
m=3 kg
h=21 m
g=9.81 m/s^2
Substitute these values into the formula.
PE=3*9.81*21
Multiply all the numbers together
PE=63*9.81
PE=618.03
The potential energy is 618.03 kg m^2/s^2, or 618.03 Joules
Whats the question exactly?
Answer:
D
Explanation:
Scientists use significant figures to avoid claiming more accuracy in a calculation than they actually know.
Answer with explanation :
The negative sign means that the potential energy decreases by the movement of the electron.
negative charge at rest in an electric field moves toward the region of an electric field , so that its potential energy will diminish and change into the kinetic energy of motion. The total energy remains constant.
Positive charges will move downhill because of convention. It is to stay in accordance with other potential theories, particularly gravity, where the "charge" is mass, that moves downwards in the gravitational potential field expressed by ϕ(r)=−GM|r|ϕ(r)=−GM|r|. In an electronic system, howbeit, positive charges are fixed in their position within a component (e.g., a wire), therefore instead of the mobile,the negative charges, electrons, move uphill.
Ridges, mountains, and volcanoes!
