(a) The work done by the bird to raise the snake on the branch is equal to the product between the weight of the snake and the height of the branch above the ground:

where
is the mass of the snake and
is the height of the branch with respect to the ground. Substituting numbers into the equation, we find

(b) The work the bird did to raise its own centre of mass from the ground to the branch is equal to the product between the bird's weight and the height of the branch:

where
is the mass of the bird. Substituting numbers into the equation, we find

Answer:
4
Explanation:
Humans can detect light and sound, also light and sound travel in waves. Light is faster than sound but sound waves cannot travel through space because there is no medium for the sound waves to travel through.
We have that the electric field at the center of the metal ball due only to the charges on the surface of the metal ball is

From the question we are told that
A solid metal ball of radius 1.5 cm
bearing a charge of -15 nC is located near a hollow plastic ball of radius 1.9 cm bearing
uniformly distributed charge of -7 nC
The distance between the centers of the balls is 9 cm
Generally the equation for the electric field is mathematically given as


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Answer:
D
Explanation:
Cause im smart smart and the atom is very simple just use google lol