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3 years ago

Which of the following energy sources is NOT a type of coal or coal-precursor?

Physics

1 answer:

Novay_Z [31]3 years ago

7 0

Correct answer choice is :

B) Petroleum

Explanation:

Petroleum is commonly happening, yellow to the black liquid obtained in geological structures below the Earth's surface. It is usually filtered into different types of fuels. Petroleum outcomes involve transport fuels, fuel oils for heating and power generation, pavement and road oil, and feedstocks for making the compounds, plastics, and plastic elements that are in almost everything we use.

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Why does a magnet get demagnetized when hammered?

ale4655 [162]

Answer:

Answer is on the pic

Explanation:

I hope it's helpful!

4 0

3 years ago

a stone is vertically thrown upward with the velocity of 72km/hr find the maximum height reached the height

erik [133]

Answer:

y = 20.38 [m]

Explanation:

In order to solve these problems, we must use the following kinematics equation.

$v_{f} ^{2} =v_{i} ^{2}-(2*g*y)$

where:

Vf = final velocity = 0

Vi = initial velocity = 72 [km/h]

g = gravity acceleration = 9.81 [m/s^2]

y = vertical elevation [m]

We need to convert [km/h] to [m/s]

$72[\frac{km}{h}]*[\frac{1h}{3600s}]*[\frac{1000m}{1km} ] = 20 [m/s]$

Note: the negative sign of the equation means that the acceleration acts in the opposite direction to the movement of the body. And the final speed is zero, because when the body reaches the maximum height, the Stone does not move its speed has been reduced to its entirety.

0 = (20)^2 - (2*9.81*y)

20^2 = 2*9.81*y

y = 20.38 [m]

3 0

3 years ago

Look at the scissors. Which simple machines make up scissors?

Alja [10]

I believe the correct answer from the choices listed above is option B. The blades of the scissors are a pair of wedges in a cross shape which pivot around a fulcrum. The attached handles are levers. So, two levers and two wedges

4 0

3 years ago

Read 2 more answers

What is the electric force acting between two charges of 0.0042 C and

DerKrebs [107]

The electric force acting between the two charges is - 2.1 * 10^10.

Explanation:

An electric force is exerted between any two charges. Objects with the same charge, having both positive negative charges repel each other, and objects with opposite charges will attract each other.

The formula for finding the electric force is given by,

F = (k q1 q2) / r^2

= (9 * 10^9)(4.2 * 10^-3)(-5 * 10^-3) / (3 * 10^-3)^2

F = -2.1 * 10^10.

4 0

3 years ago

The pitch of a sound wave is its _________. A.speed B.amplitude C.frequency D.wavelength

Artyom0805 [142]

Hi there my friend :)

Your answer is C. frequency

Hope this helps :)

-xxAnsxx-

8 0

3 years ago