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vova2212 [387]
4 years ago
12

The total energy in a closed system remains the same or changes as energy changes forms

Physics
1 answer:
lakkis [162]4 years ago
7 0

The total energy remains the same, as long as
none of it escapes the closed system.

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A series RLC circuit has a resistance of 28 Ω and an impedance of 105 Ω. If the rms voltage applied to the circuit is 140 V, wha
sergiy2304 [10]

Answer:49.8W

Explanation:

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3 years ago
A lawn sprinkler sprays water 8 feet at full pressure as it rotates 360 degrees. if the water pressure is reduced by 50%, what i
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The area of the sprinkles can be determined through the area of a circle that is pi * r^2 in which the given dimensions above are the radii, r. The second scenarios radius is only half of the original, that is 4 ft. In this case, we can compute the area of the second again. We calculate next the difference of two areas of circles. 
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4 years ago
What is any push or pull on an object called?
lesantik [10]

Answer:

A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects.

Explanation:

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3 years ago
Larger animals use proportionately less energy than smaller animals; that is, it takes less energy per kg to power an elephant t
marin [14]

Answer:

Part a)

Q = 952 cal/day

Part b)

P = 46 Watt

Part c)

\Delta P = 54 W

Explanation:

As we know that 5000 kg African elephant requires 70,000 Cal for basic needs per day

so we will have

m = 5000 kg

Q = 70,000 Cal

so we have energy required per kg

E = \frac{70,000}{5000}

E = 14 cal/kg

Part a)

now we know that per kg the energy required will be same

so we have mass of the human is 68 kg

so energy required per day is given as

Q = 68 \times 14

Q = 952 cal/day

Part b)

Resting power is the rate of energy in Joule required per sec

so it is given as

P = \frac{952 \times 4186}{24\times 3600}

P = 46 Watt

Part c)

resting power given in the book is

P' = 100 W

so this is less than the power given

\Delta P = 100 - 46

\Delta P = 54 W

6 0
3 years ago
At an average speed of 12 m/s , how many kilometers can a cyclist travel in a 10 hour day?
loris [4]

Answer:

432 km = 432000 m

Explanation:

Primeiro, vamos converter m/s para km/h:

12 m/s = (12 . 3,6)km/h = 43,2 km/h

Agora é só descobrir a distancia que ele percorre em 10 h:

s=43,2.10 = 432 km

Aí se você quiser colocar na medida do Sistema Internacional:

5 0
3 years ago
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