Answer:
1 N
Explanation:
Given that two point charges +3 micro coulomb and +8 micro coulomb repel each other with a force of 40N.
Let us first calculate the distance between the two point charges
F = (KQq)/r^2
Where K = 9.0 × 10^9Nm^2C^-2
40 = (9×10^9 × 3×10^-6 × 8×10^-6)/r^2
Make r^2 the subject of formula
r^2 = 0.216/40
r = sqrt (5.4^-3)
r = 0.0735 metres
If a charge of -5 micro coulomb is added to each of them, then the force between them will become?
Using the same formula again
F = ( KQq)/r^2
Where Q = 8 - 5 = +3 × 10^-6 C
q = 3 - 5 = - 2 × 10^-6 C
F = ( 9×10^9 × 3×10^-6 × 2×10^-6 )/5.4×10^-2
F = 0.054/0.054
F = 1 N
The force of attraction between the two point charges will be 1 N
At the instant when gravity turned off, the moon would leave its curved orbit,
and would sail off in a straight line, in the direction it was going when gravity
disappeared.
Not really. When you look at the bigger picture, it turns out that the moon
is much more in orbit around the sun than it is around the Earth. Its orbit
is very nearly a solar orbit, but with some relatively shallow dimples in it
that result from the gravitational influence of the Earth. If that influence
suddenly disappeared, the moon would continue in its solar orbit ... moving
either slightly faster or slightly slower than the Earth, depending on whether
it was nearer or farther from the sun when Earth's gravity disappeared.
We would see the moon either slowly pull away from us toward the west,
or slowly fall behind us to the east. Either way, it would get smaller and
smaller and eventually disappear in the distance, and it would come around
to meet us again roughly once each year.
Regarding the Earth's motion (and the motion of every other planet),
there suddenly wouldn't be any centripetal force to curve the Earth's
path. So the Earth would sail off in a straight line, in the direction it
was moving at the instant when the sun's gravity disappeared.
Although everything would become very dark, you wouldn't feel
anything different. Even now, as we follow the curved orbit around
the sun, the direction of the Earth's motion only changes by about
one degree per day, so we don't feel it.
A because he is putting three vitals on a hot plate
