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Crazy boy [7]
3 years ago
9

Hi im being timed please help im trying to raise my F in the class before graduation

Physics
1 answer:
Minchanka [31]3 years ago
3 0

Answer:

D

Explanation:

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3. An engine’s fuel is heated to 2,000 K and the surrounding air is 300 K. Calculate the ideal efficiency of the engine. Hint: T
maksim [4K]

Answer: E = 0.85

Therefore the efficiency is: E = 0.85 or 85%

Explanation:

The efficiency (e) of a Carnot engine is defined as the ratio of the work (W) done by the engine to the input heat QH

E = W/QH.

W=QH – QC,

Where Qc is the output heat.

That is,

E=1 - Qc/QH

E =1 - Tc/TH

where Tc for a temperature of the cold reservoir and TH for a temperature of the hot reservoir.

Note: The unit of temperature must be in Kelvin.

Tc = 300K

TH = 2000K

Substituting the values of E, we have;

E = 1 - 300K/2000K

E = 1 - 0.15

E = 0.85

Therefore the efficiency is: E = 0.85 or 85%

4 0
4 years ago
Need answer ASAP!!!
Alina [70]

Hello!

Use <u>ohm law:</u>

I = V / R

Replacing:

I = 100 V / 20 O

I = 5 A

The current is <u>5 amperes.</u>

5 0
3 years ago
The Geocentric Model was what scientists
e-lub [12.9K]

Answer:

Galileo Galilei was looking into a telescope and he realized we orbit around the sun and the moon orbits around us

Explanation:

5 0
3 years ago
Does the sign of the charge (positive or negative) affect how that charge is dissipated? Explain.
labwork [276]
This is an add proceeded by
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3 years ago
incline plane is given length 12m,load 600 newton,effort 200 Newton, Height 3 metre find its velocity ratio and mechanical advan
Salsk061 [2.6K]

Answer:

i. The velocity ratio of the plane is 4.

ii. The mechanical advantage of the plane is 3.

Explanation:

i. The velocity ratio (VR) of an inclined plane is ratio of its length to the height. It is given as;

VR = \frac{length of the plane}{height} = \frac{l}{h}

Given: l = 12 m, L = 600 N, E = 200 N, h = 3 m.

So that,

VR = \frac{12}{3}

     = 4

The velocity ratio of the plane is 4.

ii. Mechanical advantage (MA) expresses the relationship between the load overcome to effort applied.

MA = \frac{Load}{Effort} = \frac{L}{E}

      = \frac{600}{200}

      = 3

The mechanical advantage of the plane is 3.

Therefore, the velocity ratio of the inclined plane is 4, and its mechanical advantage is 3.

7 0
3 years ago
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