Physics, 20.08.2019 15:30 jessezarate4513

Aball of mass 2 kg is kept on the hill of height 3 km. calculate the potential energy possessed by it ?
how can i get the potential energy ?

Answers: 2

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Answer from: ichooseme10

We know that -

P.E=m*g*h

Where,

First we convert height into meters.

1 km = 1000 meters

3 km = 1000 * 3 meters = 3000 meters

So, putting the values in the above formula, and by taking 'g' = 9.8 m/s², we get-

P.E.= 2*3000*9.8

Answer from: musfirahkhurram

Sairah's work is correct as far as it goes. The potential energy of the ball
relative to the bottom of the hill is 58,800 Joules.

To address the second part of the question:
In order to get ahold of that energy, the ball must be returned to the bottom
of the hill. The most efficient way would be to drop it, so that it wouldn't have to
scrape along the grass on the way down. But that can only work if there's a sheer
cliff on one side of the hill. Otherwise, you just have to roll it down, and accept the
fact that it loses some of its energy to friction on the way.

However the ball gets to the bottom, the energy it has left shows up in the form
of kinetic energy, and 58,800 joules is a lot of kinetic energy. If somehow the ball
could arrive at the bottom with ALL the energy it had at the top, it would be moving
at something like 540 miles per hour !

Answer from: Quest

answer;

d. are made mostly of liquid

explanation;

-the general composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

Answer from: Quest

The best answer i can think of is b

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Aball of mass 2 kg is kept on the hill of height 3 km. calculate the potential energy possessed by i...