Calculate the force exerted on the pipe by a and b respectively.

Taking .

Worker A: 476 N.Worker B: 324 N.Explanation

Worker A:

Consider the pipe as a level. Worker A will supply the effort, and worker B will act as the fulcrum.

Worker A applies an upward force 4.2 meters away from the fulcrum. The weight of the pipe acts at the center of its mass, which is 2.5 meters away from the fulcrum. The level is class two.

Worker B:

Again, consider the pipe as a level. Worker B will now supply the effort, and worker A will act as the fulcrum.

Worker B applied an upward force 4.2 meters away on the left-hand side of the fulcrum.

The weight of the pipe acts at two positions.

of the pipe's mass acts downwards between worker A and B. That of mass will act downward at its center of mass away on the left-hand side of the fulcrum. of the pipe's mass acts downwards to the right of worker B. That of mass will act also downward at its center of mass away on the right-hand side of the fulcrum.

for the pipe to balance. Therefore:

.

Make sure that .

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.