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3 years ago

Please help on these questions!!!

Physics

1 answer:

tatiyna3 years ago

8 0

-- First question . . . first answer choice

-- Second question . . . second answer choice

-- Third question . . . third answer choice

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Physics Question - Matching

KiRa [710]

1) G

2) E

3) D

4) I

5) J

6) C

7) H

8) F

9) B

10) A

I think... i am not 100% sure....

7 0

4 years ago

Read 2 more answers

The efficiency of a carnot cycle is 1/6. If on reducing the temperature of the sink 75 degree Celsius, the efficiency becomes 1/

svp [43]

Answer:

375 and 450

Explanation:

The computation of the initial and the final temperature is shown below:

In condition 1:

The efficiency of a Carnot cycle is $\frac{1}{6}$

So, the equation is

$\frac{1}{6} = 1 - \frac{T_2}{T_1}$

For condition 2:

Now if the temperature is reduced by 75 degrees So, the efficiency is $\frac{1}{3}$

Therefore the next equation is

$\frac{1}{3} = 1 - \frac{T_2 - 75}{T_1}$

Now solve both the equations

solve equations (1) and (2)

$2(1 - T_2/T_1) = 1 - (T_2 - 75)/T_1\\\\2 - 1 = 2T_2/T_1 - (T_2 - 75)/T_1\\\\ = (T_2 + 75)/T_1T_1 = T_2 + 75\\\Now\ we\ will\ Put\ the\ values\ into\ equation (1)\\\\1/6 = 1 - T_2/(T_2 + 75)\\\\1/6 = (75)/(T_2 + 75)$

T_2 + 450 = 75

T_2 = 375

Now put the T_2 value in any of the above equation

i.e

T_1 = T_2 + 75

T_1 = 375 + 75

= 450

7 0

3 years ago

Why can objects be made to float in a magnetic field?

dimulka [17.4K]

I would say that the answer is C

6 0

3 years ago

What is the index of refraction?

laiz [17]

Answer:

a. the ratio of the speed of light in a vacuum to the speed of light in the material it is passing though

Explanation:

When a light ray enters from one medium to another, it bends. This is because the speed of light decreases as it enters a medium having more optical density. The speed of light is maximum in vacuum.

The refractive index determines the optical density of a medium. It is the ratio of the speed of light in the vacuum (c) to the speed of light in the material it is passing through (v).

$\mu=\frac{c}{v}$

6 0

4 years ago

Read 2 more answers

How much energy must be removed from a 450 g block of ice to cool it from 0∘c to -20 ∘c?

frutty [35]

<span>The energy removed from a 450 g block of ice can only be done with a few options: a colder freezing facility, liquid nitrogen, or stopping the energy at all and adding dry ice for a brief period. The 450 g block should loose heat energy faster in a thermostat set at -20 degrees just to maintain the ice formation.</span>

3 0

4 years ago