All categories

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 <span>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

</span>

You might be interested in

7. A box is pulled straight across the floor at a constant speed. It is pulled with a horizontal force of 48 N.

Leya [2.2K]

Answer:

a)Taking into consideration Newton’s second law, we know that

Net_Force = mass * acceleration

Since the box is pulled at constant speed, the acceleration is equal to zero.

This means that

Net_Force = 0 N

b) Force of friction

The net force is equal to the sum of all forces,

Net_Force = Force_applied - Friction

We found that Net_Force = 0, which means

Friction = Force_applied = 48 N

c) If the box comes to a stop. And the applied force becomes zero, the friction force becomes also zero.

Friction = 0 N

4 0

2 years ago

Which phrase best describes a gravitational force?

saveliy_v [14]

Answer:

B or A Try your best to choose Between those 2 if not I'll help u

5 0

2 years ago

Read 2 more answers

The majority of neritic sediments are of which type?

lesantik [10]

The answer is A. Hope this helps I tried my best!

8 0

2 years ago

A 12000 kg railroad car is traveling at a 2 m/s when it strikes another 10000 kg railroad is at rest. If the car lock together w

zimovet [89]

The final speed is $1.09m\frac{m}{s}$

Why?

To calculate the final speed, we need to know that we are working with an inelastic collision, it means that both bodies stick together after the colission. We can calculate the final speed of the bodies (if exists) using the following equation:

$m_{1}v{1}+m_{2}v_{2}=(m_{1}+m_{2})v_{f}$

We are given the following information:

$m_{1}=12000kg\\v_{1}=2\frac{m}{s}\\m_{2}=10000kg\\v_{2}=0\frac{m}{s}(at rest)$

So, substituting and calculating, we have:

$m_{1}v{1}+m_{2}v_{2}=(m_{1}+m_{2})v_{f}\\\\12000kg*2\frac{m}{s}+10000kg*0\frac{m}{s}=(12000kg+10000kg)*v_{f}\\\\v_{f}=\frac{24000\frac{kg.m}{s} }{22000kg}=1.09m\frac{m}{s}$

Hence, the final speed is 1.09 m/s.

Have a nice day!

5 0

3 years ago

Two parallel plates of area 7.34 x 10^-4 m^2 have 5.83 x 10^-8 C of charge placed on them. A 6.62 x 10^-6 C charge q1 is placed

inn [45]

Answer:

* if the two plates have the same charge sign F_net = 0

*if one plate is positive and the other is negative F_net = 59.4 N

Explanation:

The electric field created by a parallel plate is

E = $\frac { \sigma }{2 \epsilon_o }$

where sigma is the charge density

σ = Q / A

we substitute

E = $\frac{Q}{A \ 2 \epsilon_o }$

E = $\frac{ 5.83 \ 10^{-8} }{7.34 \ 10^{-4}\ 2 \ 8.5 \ 10^{-12} }$

E = 4.487 10⁶ N / C

the electric force is

F = E / q

in this force it is a vector, so if the charges are of the same sign they repel and if they are of the opposite sign they attract. In this case, the test load is between the two plates that have the same load sign, so the forces are in the opposite direction.

* if the two plates have the same charge sign

F_net = F₁ - F₂

F_net = q (E₁ -E₂)

since the electric field does not depend on the distance

E₁ = E₂

in consecuense

F_net = 0

In a more interesting case

*if one plate is positive and the other is negative

F_net = F₁ + F₂

F_net = q (E₁ + E₂) = 2 q E₁

F_net = 2 6.62 10⁻⁶ 4.487 10⁶

F_net = 59.4 N

net force goes from positive to negative plate

7 0

2 years ago