2 years ago

How is the thermal efficiency of a heat engine defined?

Physics

1 answer:

77julia77 [94]2 years ago

8 0

By the gravity of the earth it is defined by the thermal efficiency

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The answer is A.
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3 years ago

What’s the stored energy related to positions of atoms within molecules

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3 years ago

If a snail moves 6.5in/min, how many miles per hour does the snail travel?

Arturiano [62]

Answer:

Unit Conversion

6.5in/min× 1ft/12in× 1 mile/5280ft= 0.001231 m/min
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2 years ago

Ask Your Teacher A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 33.5° and the ang

Oduvanchick [21]

Answer:

The critical angle for the liquid when surrounded by air is 30 degrees.

Explanation:

Given that,

The angle of incidence is 33.5° and the angle of refraction is 19.3°. Firstly, we can find the refractive index of the liquid. It can be calculated using Snell's law as :

$n=\dfrac{\sin i}{\sin r}\\\\n=\dfrac{\sin (33.5)}{\sin (19.3)}\\\\n=2$

The critical angle is given by :

$\theta_c=\sin^{-1}(\dfrac{n_1}{n_2})$

Here, $n_1$ is refractive index of air and $n_2$ is refractive index of liquid.

$\theta_c=\sin^{-1}(\dfrac{1}{2})\\\\\theta_c=30^{\circ}$

So, the critical angle for the liquid when surrounded by air is 30 degrees.

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3 years ago

What is the energy of a 5 kg object that is held at a height of 3 m above the ground?

Korolek [52]

Answer:

a 5 kilogram mass, at a height of 3 meters, while acted on by Earth's gravity would have 147.15 Joules of potential energy, PE = 3kg * 9.81 m/s2 * 5m = 147.15 J.

Explanation:

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2 years ago