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myrzilka [38]
3 years ago
6

PLEASE HELP AND HURRY

Physics
2 answers:
Ahat [919]3 years ago
6 0

Answer:

B

Explanation:

Vikentia [17]3 years ago
6 0

Answer:

D. m/s^2

Explanation:

meters / second ^2

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A boulder of mass 2000. kg breaks loose of a mountainside and plunges 200. m straight down into a lake at a temperature of 5.00◦
natka813 [3]

Answer:

DS = 13865.7[J/K]

Explanation:

We can calculate the energy of the rock, like the potential energy relative to the lake level. Which can be calculated by means of the following expression of the potential energy:

E_{p}=m*g*h\\\\where:\\m = mass = 2000[kg]\\h = elevation = 200 [m]\\g = gravity = 9.81[m/s^2]

Therefore:

E_{p}=2000*9.81*200\\E_{p}=3924000 [J]\\

This energy is transformed into thermal energy.

we shall remember that isothermal heat transfer processes are internally reversible, so the entropy change of a system during one of these processes can be determined, by the following expression.

DS=\frac{Q}{T}\\ where:\\DS = entropy change [J/K]\\Q = Heat transfer [J]\\T = temperature [K]

T = 5 + 278 = 283[K]

DS = 3924000 / 283

DS = 13865.7[J/K]

5 0
4 years ago
The forces acting on a leaf are
otez555 [7]

Affected plants

Explanation:

8 0
4 years ago
70kg man runs up a flight of staurs in 4 sec . The vertical height of the stairs is 4.5 m . Calculate his power
Fittoniya [83]

Answer:

<h2>771.75 watt</h2>

Explanation:

Given,

Mass ( m ) = 70 kg

Distance ( d ) = 4.5 m

Time taken ( t ) = 4 seconds

Power = ?

Now, applying the formula to find power:

power =  \frac{work \: done}{time \: taken}

= \:   \frac{f \:  \times  \: d}{t}

=  \frac{m \:  \times  \: g \:  \times  \: d}{t}

Plugging the values:

=  \frac{70 \times 9.8 \times 4.5}{4}

Calculate the products

=  \frac{3087}{4}

Divide:

= 771.75 \: watt

Hope this helps...

Best regards!!

4 0
3 years ago
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The circular path that the car is following reveals the presence
of a net force acting on the car. 

If there were no net force, pointing toward the center of the circular
path, the car would travel in a straight line.
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3 years ago
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Which reaction below represents a balanced, combustion chemical reaction?
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I believe the correct answer would be <span>C2H5OH + 3O2 → 2CO2 + 3H2O . A combustion reaction is one that reacts with oxygen and produces carbon dioxide and water. As you can see, option A falls into that category and is a balanced reaction.</span>
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