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Vadim26 [7]
3 years ago
10

Electrical energy is used to turn the blades of a fan. The amount of energy transformed is seen here : 750 J electrical energy i

s transformed into 400 J kinectic energy . What happened to the remaining 350j of energy?
Physics
1 answer:
Charra [1.4K]3 years ago
3 0

Electrical energy is used to run the fan

Here as per given condition 750 J of electrical energy is used to run the fan which is converted into Kinetic energy as 400 J

So here we can see that 350 J of energy is lost against many other type of frictional and resistive loses.

So here we can say that out of 750 J of energy only 400 J is used to run the fan and rest amount of energy is lost against friction.

also we can say that efficiency of this fan will be

\eta = \frac{Useful}{Total}

\eta = \frac{400}{750}

\eta = \frac{8}{25}


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What is the formula that describes the magnitude of impulse on an object?
vladimir1956 [14]

Answer:

Option C.

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Explanation:

Impulse is defined by the following the following formula:

Impulse = force (F) × time (t)

Impulse = Ft

From Newton's second law of motion,

Force = change in momentum /time

Cross multiply

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Recall:

Impulse = Force × time

Thus,

Impulse = change in momentum

Recall:

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8 0
3 years ago
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7 0
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The speed of light is 3.0 x 108 m/s. How far does light travel in one day? Remember that you should first convert the day into s
Anna35 [415]

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We need to find the distance traveled by it in one day.

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Now, using the formula of speed to find the distance covered as follows :

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Putting all the values, we get :

d=3\times 10^8\ m/s\times 86400\ s\\\\d=2.59\times 10^{13}\ m

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6 0
3 years ago
You take the same 3 kg metal block and slide it along the floor, where the coefficient of friction is only 0.4. You release the
spin [16.1K]

Answer:

1.52905 seconds

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t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

\mu = Coefficient of friction = 0.4

g = Acceleration due to gravity = 9.81 m/s²

a = Acceleration = \mu g

Equation of motion

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It will take 1.52905 seconds for the block to slow down

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The block will travel 4.58715 m before it stops

7 0
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