80 joules
Further explanation
Given:
A 2 kg mass is held 4 m above the ground.
Let us write as follows:
Question:
What is the approximate potential energy (PE) due to gravity of the mass with respect to the ground?
The Process:
We will solve the problem of gravitational potential energy.
Gravitational potential energy = mgh, where m represents mass (in kg), g represents Earth's gravitational field (10 N kg⁻¹), and h represents the height change (in m).
Let us find out the approximate potential energy due to the gravity of the mass concerning the ground on the Earth.
Gravitational potential energy = (2 kg)(10 N kg⁻¹)(4 m)
Thus, gravitational potential energy equal to 80 joules.
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Notes:
- The equation assumes that the gravitational potential energy gives zero PE (potential energy) at the surface of the Earth. This works for everyday situations but it is not fundamental.
- Newton's theory of universal gravitation states that the field must change with distance.
- As long as it is not stated in the problem, the Earth's gravitational field strength (g) is 10 N kg⁻¹ (or 10 m s⁻²). Unless otherwise specified, for example, g = 9.81 m s⁻², we use this value in calculations. The symbol g can also be called a gravitational acceleration constant.
Learn more
- A case problem of uniformly accelerated motion and Newton's Second Law https://brainly.com/question/11181200
- Particle's speed and direction of motion https://brainly.com/question/2814900
- The energy density of the stored energy https://brainly.com/question/9617400
