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3 years ago

9. In 35 s..a pump delivers 55,000 g of oil into a barrel on a platform 25 m

Physics

1 answer:

julia-pushkina [17]3 years ago

3 0

The work done by the pump is 13475 J.
The power of the pump is 385 W.

<u>Explanation:</u>

When a force causes a body to move work is being done on the object by the force. Work is the measure of energy transfer when a force moves an object through a distance. The work done is the product of mass, gravity, and height.

Work done = m * g * h

= 55 * 9.8 * 25

Work done = 13475 J.

Power is defined as the rate of doing work with time.

Power = work done / time

= 13475 / 35

Power = 385 W.

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Read 2 more answers

Choose all facts that increase the orbital velocity of a vessel around planet B. Bigger mass of planet B smaller mass of planet

telo118 [61]

Answer:

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- orbiting closer to planet B

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The orbital velocity of the vessel around the planet can be found by equalizing the force of gravity between the vessel and the planet and the centripetal force:

$G\frac{mM}{r^2}=m\frac{v^2}{r}$

where

G is the gravitational constant

m is the mass of the vessel

M is the mass of the planet

r is the distance between the vessel and the centre of the planet

v is the orbital velocity of the vessel

Re-arranging the formula, we find an expression for v:

$v=\sqrt{\frac{GM}{r}}$

We see that:

- the bigger the mass of the planet, M, the bigger the velocity

- the bigger the distance between the vessel and the planet, r, the smaller the velocity

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