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3 years ago

13

-) Josh and Mark are climbing a ladder on the playground. Josh is 3m up the ladder and has a mass of 50 kg

1 answer:

iren2701 [21]3 years ago

6 0

I think the correct answer is A mark has greater gravitational potential energy
:)

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3 years ago

Which of the following is another way to say that, in energy transforms, some energy is always converted unusable or unwanted fo

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3 years ago

This typically occurs on the sun?<br> fusion<br> fission<br> very few chain reactions<br> half life

melisa1 [442]

Answer:

Fusion

Explanation:

The thermonuclear fusion(only occurs at extreme conditions of temperature and pressure like interiors of stars) of Hydrogen takes place in The Sun's core.

Every four hydrogen atoms combine to form a Helium atom with a release of 26.7Mev of energy.

On a large scale this amount of energy can be very huge.

It is calculated that tis proces has being going on for the past $5\times$ $10^{9}$ years and with the amount of Hydrogen left will be sufficient to keep it going for the same amount of time in the future.

After this process ends,the Sun's core which will be mostly Helium,will start to cool and collapse under its own gravity.

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4 years ago

A certain gasoline engine has an efficiency of 35.3%. What would the hot reservoir temperature be for a Carnot engine having tha

levacccp [35]

Answer:

The temperature of hot reservoir is 669.24 K.

Explanation:

It is given that,

Efficiency of gasoline engine, $\eta=35.3\%=0.353$

Temperature of cold reservoir, $T_C=160^{\circ}C=433\ K$

We need to find the temperature of hot reservoir. The efficiency of Carnot engine is given by :

$\eta=1-\dfrac{T_C}{T_H}$

$T_H=\dfrac{T_C}{1-\eta}$

$T_H=\dfrac{433}{1-0.353}$

$T_H=669.24\ K$

So, the temperature of hot reservoir is 669.24 K. Hence, this is the required solution.

4 0

3 years ago