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4 years ago

Engineering mechanics statics

Physics

1 answer:

PtichkaEL [24]4 years ago

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An incandescent bulb is supplied with

Serga [27]

Answer:

Efficiency = 5%

Explanation:

Given that,

Supplies energy to the bulb = 100 J

Transferred energy by the bulb = 5 J

We need to find the efficiency of the bulb. It can be given by "

$\eta=\dfrac{\text{useful energy out}}{\text{useful energy in}}\times 100\\\\=\dfrac{5}{100}\times 100\\\\=5\%$

So, the efficiency of the bulb is 5%.

8 0

3 years ago

Need help with the questons asap

mina [271]

Which questions? i need to see the actual question, did you like upload them to your profile now?

4 0

4 years ago

Consider the vector b⃗ with magnitude 4.00 m at an angle 23.5∘ north of east. what is the x component bx of this vector?

Aleksandr [31]

Answer:

3.67 m

Explanation:

A physical quantity is said to be vector quantity if it need a magnitude as well as direction for complete explanation.

It makes an angle 23.5 degree from positive X axis.

So, it's component along X axis is given by

bx = B Cos theta

bx = 4 × Cos 23.5

bx = 3.67 m

6 0

4 years ago

Read 2 more answers

A body of mass 2.78 kg is pushed straight upward by a 31.3 N vertical force. What is its acceleration (in m/s2)

Bingel [31]

To solve this problem we will apply the concepts related to Newton's second law for which the product of mass and acceleration is defined as the force applied to an object. Mathematically this is,

$F_{net} = ma \rightarrow a = \frac{F_{net}}{m}$

Here,

$F_{net} =$ Net external Force

m = Mass of the body

a = Acceleration

The net force on the body would be given by the difference between the ascending force and the weight, therefore,

$F_{net} = F-W$

Here,

F = Upward Force

W = Weight

The Weight is,

$W = (2.78kg)(9.81m/s^2)$

$W = 27.27N$

Then the $F_{net}$ is

$F_{net} = 31.3-27.27$

$F_{net} = 4.03N$

Finally replacing at the first equation we have,

$a = \frac{4.03N}{2.78kg}$

$a = 1.44m/s^2$

Therefore the acceleration of the stone is $1.44m/s^2$

8 0

4 years ago

Why won't a very bright beam of red light impart more energy to an ejected electron than a feeble beam of violet light?

bearhunter [10]

This is related to the energy carried by photons of light the energy of each photon is proportional to the frequency of the light since red light has a lower frequency then violet light and photons of red light carry less energy than the photons of violet light as a result the red protons eject electrons that have less energy than the ejected electrons by Violet photons

3 0

3 years ago