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3 years ago

Under certain conditions, it is possible to get more work out of a machine than you put into it.

1 answer:

7 0

IF that were true, then you could take some of the work from the output,
put it back into the input to keep the machine running, and use the rest
to run the lights and the hot water heater in your house. That way, you'd
never need to buy energy from the electric company.

You NEVER get more work out of a machine than you put into it.
Never never never.

(Unless there's a battery or a tiny gasoline engine or a hamster
on a treadmill inside.)

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Un motor realiza un trabajo de 5000 j en 20 s a) ¿ cual es la potencia del motor ?B)¿en cuanto tiempo desarollan el mismo trabaj

zimovet [89]

Answer:

a. Potencia = 250 Watts

b. Tiempo = 333.33 segundos

Explanation:

Dados los siguientes datos;

Energía = 5000 Joules

Tiempo = 20 segundos.

Para encontrar el poder;

Poder = energía/tiempo

Potencia = 5000/20

Potencia = 250 Watts

B. ¿Para saber cuánto tarda una máquina en realizar el mismo trabajo;

Dado: potencia = 15 W

Tiempo = energía/poder

Tiempo = 5000/15

Tiempo = 333.33 segundos

3 0

3 years ago

A 3,162-kg truck moving with a velocity of 12 m/s to the East hits a 510-kg parked car. The impact causes the car to be set in m

Musya8 [376]

Given:

The mass of the truck is m1 = 3162 kg

The speed of the truck is v1i = 12 m/s in East

The mass of the parked car is m2 = 510 kg

The speed of car is v2i = 0 m/s

The speed of car after collision is v2f = 24 m/s in East

To find the speed of the truck after collision.

Explanation:

The final velocity of the truck will be

$\begin{gathered} m1v1i+m2v2i=m1v1f+m2v2f \\ v1f\text{ =}\frac{m1v1i-m2v2f+m2v2i}{m1} \\ =\frac{3162\times12-510\times24+510\times0}{3162} \\ =8.129\text{ m/s} \end{gathered}$

Thus, the speed of the truck after collision is 8.129 m/s

6 0

1 year ago

You are pushing a 20 N object for 3 meters. If you have to push

Ludmilka [50]

Answer:

For the first equation, the work done would be 60 J, but if it is done with 30 N, it would have been 90 J.

Explanation:

it's actually pretty easy one you practice it for some time. W ( work done in joules ) = F ( force put onto the object in newtons ) * D ( distance traveled in meters ).

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3 years ago

A hanging nickel wire with diameter 0.12 cm is initially 2.7 m long. when a 117 kg mass is hung from it,

dedylja [7]

Yoooooo You want to mbe asd asdas

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3 years ago

as you take a short canoe trip on the Brazos River you paddle your canoe 200 miles up the river in 420 seconds and then turn aro

Maurinko [17]

200 miles/420 secs = 10/21
350 mile/280 secs = 5/4

(5/4+10/21)/2= 145/168 miles per sec
or .86 miles/sec

8 0

3 years ago