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Olin [163]
3 years ago
8

Nonrenewable mineral resources are often used as fuel. Which choice is a good way to conserve the nonrenewable resources we now

use for fuel?
A) Use charcoal, obtained by burning wood for fuel.
B) Use coal in thermal power plants to obtain energy.
C) Explore alternative sources of energy, such as solar energy.
D) Extract minerals from the sea, leaving the resources on land untouched.
Physics
2 answers:
mr_godi [17]3 years ago
6 0
The answer is C because first of all A and B include using nonrenewable resources which isn't really conserving them. Secondly D makes no sense because we would be cutting ourselves off from sources like Geothermal, Biomass, solar power, and also Wind energy!

Hope this helps! :)
Gekata [30.6K]3 years ago
5 0
C) explore alternative sources of energy, such as solar energy
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The magnitude of the resultant force is to be 200 N, directed along the positive ݒaxis. Determine the magnitude of the force Fin
Ilia_Sergeevich [38]

Answer: F = 776.18N θ = 29.41°

Question:

The magnitude of the resultant force is to be 200 N, directed along the positive y-axis. Determine the magnitude of the force F Find the angle θ.

Attached is the image.

Explanation:

To solve this question we need to resolve the forces to the x and y axis.

For the x axis;

Fcosθ = 700cos15....1

For the y axis;

200 = Fsinθ - 700sin15

Fsinθ = 200 + 700sin15 ...2

Dividing equation 2 by 1

Fsinθ/Fcosθ = (200 + 700sin15)/700cos15

Tanθ = (200 + 700sin15)/700cos15

θ = Taninverse(200 + 700sin15)/700cos15)

θ = 29.41°

From equation 1;

F = 700cos15/cosθ

F = 700cos15/cos29.41

F = 776.18N

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A 67.0 kg crate is being raised by means of a rope. Its upward acceleration is 3.50 m/s2. What is the force exerted by the rope
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<span>A 67.0 kg crate is being raised by means of a rope. Its upward acceleration is 3.50 m/s2. What is the force exerted by the rope on the crate? 

</span>Newton's Second Law<span> of Motion states, “The force acting on an object is equal to the mass of that object times its acceleration.” We calculate as follows:
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F = ma = 67.0 kg (3.50 m/s^2) = 234.5 J
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Answer:

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