3 years ago

How to calculate wavelength in m when you know the frequency?

Physics

1 answer:

NNADVOKAT [17]3 years ago

6 0

It's c/f, in which c is the speed of light (300000 m/s)

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supposed to vacuum cleaner uses 120 J of electrical energy. If 45 J used to pull air into a vacuum cleaner, how efficient is the

Ainat [17]

we know that

Power efficiency is defined as the ratio of the output power divided by the input power:

$efficiency =\frac{ Power\ out}{Power\ in} *100$

in this problem

$Power\ out=45J\\ Power\ in=120J$

Substitute in the formula above

$efficiency =\frac{ 45}{120} *100$

$efficiency =37.5$ %

therefore

the answer is

the efficient is $37.5$ %

4 0

3 years ago

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A car is moving at 6 m/s and then accelerates at 1.7 m/s2 for 4.2 seconds. What is the final velocity of the car?

Bad White [126]

Explanation:

Hey there!!

Here,

Initial velocity (u) = 6m/s.

Acceleration (a) = 1.7m/s^2.

Time (t) = 4.2s.

final velocity (v) = ?

We have,

$a = \frac{v - u}{t}$

Putting their values,

$1.7 = \frac{v - 6}{4.2}$

7.14 = v - 6

v = 7.14 + 6

Therefore, the final velocity is 13.14 m/s.

Hope it helps....

5 0

3 years ago

Please somebody answer I desperately need help!

padilas [110]

Preserved fossil (like a fossil in amber, ice or tar.

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4 years ago

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Un hombre parado en el techo de un edificio, tira una bola verticalmente hacia arriba con una velocidad de 12m/s, la bola llega

zmey [24]

Respuesta:

24m

Explicación:

Según la ecuación de movimiento

v = u + en

Dado

Velocidad final v = 12 m / s

velocidad inicial u = 0 m / s

tiempo t = 4s

Sustituir

12 = 0 + 4a

a = 12/4

a = 3 m / s²

Lo siguiente es obtener la distancia;

S = ut + 1 / 2at²

S = 0 (4) + 1/2 (3) (4) ²

S = 3 * 16/2

S = 48/2

S = 24 m

Por lo tanto, la distancia requerida es de 24 m.

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3 years ago

Even, in 1921, the Dodge Brothers built a boat named the SS Delphine and it had a whopping 3000 HP. So, how much horsepower woul

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Answer: I am getting a result around the 54,800 area, so I am selecting the 55,000 HP answer.

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3 years ago

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