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3 years ago

Why should we avoid putting a battery in a pocket containing keys?

Physics

1 answer:

Flauer [41]3 years ago

4 0

Answer:

There are several possibilities why a battery can feel hot or heat up. In case of an external short circuit: this can happen when the battery is short circuited i.e. in a purse, or in a drawer. ... Then there is also the possibility of a short circuit, forced charging and heating up the battery.

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A heat engine is 20% efficient. If it loses 800 J to the cooling system and exhaust during each cycle, the work done by the engi

Maurinko [17]

Answer: A. 200J

Therefore, the workdone by the heat engine is 200J

Explanation:

Given ;

The efficiency of the heat engine is E = 20% = 0.2

Heat loss L= 800J

For an heat engine the efficiency is measured by the amount of workdone by the heat engine when compared to the heat generated.

Efficiency E = workdone/heat generated × 100%

Heat generated G= workdone W + heat loss L

G = W + L

According to the question.

W = 20% of G

W = 0.2G ......1

L = 80% of G

L = 0.8G

G = L/0.8 ......2

Substituting equation 2 to 1

W = 0.2(L/0.8)

And L = 800J

W = 0.2(800/0.8)

W = 200J

Therefore, the workdone by the heat engine is 200J

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3 years ago

True or false Variables are those factors that can be changed in an experiment

tekilochka [14]

True

Variables is changing. It is any factor, trait or condition that can exist in differing amounts or types. An experiment has three types: Independent, Dependent and Controlled.

6 0

3 years ago

An 18-cm-long bicycle crank arm, with a pedal at one end, is attached to a 20-cm-diameter sprocket, the toothed disk around whic

Tpy6a [65]

Answer:

Part a)

$a = 0.056 m/s^2$

Part b)

$L = 7.85 m$

Explanation:

Part a)

Angular speed of the pedal is changing from 60 rpm to 90 rpm in 10 s

so the angular acceleration is given as

$\alpha = \frac{\omega_2 - \omega_1}{\Delta t}$

so we will have

$\alpha = \frac{2\pi(\frac{90}{60}) - 2\pi(\frac{60}{60})}{10}$

$\alpha = 0.314 rad/s^2$

now the tangential acceleration of the pedal is given as

$a = r \alpha$

$a = 0.18 \times 0.314$

$a = 0.056 m/s^2$

Part b)

Total angular displacement made by the sprocket in the interval of 10 s is given as

$\theta = \frac{\omega_f + \omega_i}{2} t$

$\theta = \frac{2\pi (\frac{90}{60}) + 2\pi (\frac{60}{60})}{2}(10)$

$\theta = 78.5 radian$

now length of the chain passing over it is given as

$L = R\theta$

$L = 0.10 \times 78.5$

$L = 7.85 m$

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4 years ago

How can water boil without heat?

kaheart [24]

Answer:

Put water at room temperature into a vacuum chamber and begin removing the air. Eventually, the boiling temperature will fall below the water temperature and boiling will begin without heating. Or if you want to be easy but messy, add dry ice to a bowl of water and watch how the water starts to boil.

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3 years ago

What style of art represents people or objects exactly as they appear in life?

frozen [14]

REALISM shows things as they REALLY look.

5 0

3 years ago

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Why should we avoid putting a battery in a pocket containing keys? ​

Why should we avoid putting a battery in a pocket containing keys?