Hi there!
We know that:
F = -dU/dx, so:
U = -400/x
dU/dx = 400/x² (Take the derivative)
F = -dU/dx = -400/x²
Finding the force at 10m away from the starting point (30m), means a position of 40m. So:
F = -400/(40²) = -0.25 N
Answer:
Quark
Explanation:
In the past the proton,neutron and electron were believed to be indivisible. Quarks were later discovered to be particles that make up the proton and neutron. Quarks are known as fast moving points of energy and are usually joined to one another through gluons. Neutron has two down quarks and one up quark while proton has two up quarks and one down quark.
The answer c for your question
Explanation:
if two individual forces are of equal magnitude and opposite direction, then the force is said to be balanced. when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction.
In March and September both of the hemispheres receive the same amount of energy from the sun. this is because neither end of the axis is tilted toward the sun.