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3 years ago

Oil _____.

Physics

2 answers:

Ostrovityanka [42]3 years ago

6 0

Answer: The correct answer for the blank is -

must be mined from underground.

Oil is considered as a fossil fuel as it is formed by the dead remains of plants and animals that lived on earth millions of years back.

It is a non renewable source of energy because it can not be replenished readily by natural means and to renew, it would again require millions of years.

Mining of oil is a process of extraction of fossil fuels from underground, which is based on the digging of underground mining excavations.

Thus, oil must be mined from underground is the right answer.

atroni [7]3 years ago

4 0

Oil must be mined from underground

Oil is NOT a renewable resource
Oil does NOT release more toxins than coal
Oil also is NOT easily replenished

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Shkiper50 [21]

Answer : The correct option is, (C) 17 m/s

Explanation :

Formula used :

$K.E=\frac{1}{2}mv^2$

where,

K.E = kinetic energy = 6.8 J

m = mass of object = 46 g = 0.046 kg (1 kg = 1000 g)

v = velocity

Now put all the given values in the above formula, we get:

$K.E=\frac{1}{2}mv^2$

$6.8J=\frac{1}{2}\times 0.046kg\times v^2$

$6.8kg.m^2/s^2=\frac{1}{2}\times 0.046kg\times v^2$

$v=17.19m/s\approx 17m/s$

Therefore, the ball's velocity be as it leaves the cannon is, 17 m/s

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A team exerts a force of 10 N towards the south in a tug of war. The other, opposite team, exerts a force of 17 N towards the no

ikadub [295]

Answer:

Option C

Explanation:

According to the question:

Force exerted by the team towards south, F = 10 N

Force exerted by the opposite team towards North, F' = 17 N

Net Force, $\vec{F_{net}} = \vec{F'} - \vec{F}$

$\vec{F_{net}} = \vec{F'} - \vec{F} = 17 - 10 = 7 N$

Thus the force will be along the direction of force whose magnitude is higher

Therefore,

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