Question

На птицу, сидящую на заборе,действует сила тяжести 2,5 Н. Какой потенциальной энергией относительно земли обладает птица, если высота забора 2 м?

Answer 1

Eпот=mgh
mg=2,5Н
h=2m
E=2.5H*2m=5дж

Answer 2

Calculating Potential Energy of a Bird on a Fence

To calculate the potential energy of the bird sitting on the fence, we can use the formula for gravitational potential energy:

Gravitational Potential Energy (GPE) = mass × acceleration due to gravity × height

Given: - Force of gravity acting on the bird = 2.5 N - Height of the fence = 2 m

We can calculate the potential energy using the given information.

Calculation

Using the formula for gravitational potential energy: GPE = mgh

Where: - m = mass of the bird (not given, but not needed for this calculation as it cancels out) - g = acceleration due to gravity (approximately 9.81 m/s^2) - h = height of the fence (2 m)

Substituting the given values: GPE = 2.5 N × 2 m

Result

GPE = 5 J

Therefore, the bird sitting on the fence has a gravitational potential energy of 5 joules relative to the ground.

This calculation assumes that the bird's mass is not needed for the calculation of gravitational potential energy, as it cancels out when calculating the force of gravity.