How much energy is supplied to a 9 V bulb if it is switched on for 3 minutes and takes a current of
0.2 A ?

Answers

Answer 1

Answer:

0.01j

Explanation:

the energy equals the work done by the bulb.

Workdone=

[tex]workdone = \frac{power}{time} [/tex]

power=voltage×current

=9×0.2

=1.8 W.

THEREFORE,

time=3×60

= 180s

workdone=1.8/180

=0.01 j


Related Questions

red light from a He-Ne laser is at 590.5 nm in the air. it is fired at an angle of 31.0 to horizontal at a flat transparent crystal of calcite (n= 1.34 ar this frequency) .find the wavelength and frequency of the light inside the crystal and the angle from horizontal that it travels inside the calcite crystal.​

Answers

Answer:

7374.4

Explanation:

I took the test

(filler so I can post)

Swordfish are capable of stunning output power for short bursts. A 650 kg swordfish has a cross-sectional area of 0.92 m2 and a drag coefficient of 0.0091- very low due to some evolutionary adaptations. Such a fish can sustain a speed of 30 m/s for a few seconds. Assume seawater has a density of 1026 kg/m3. a) How much power does the fish need to put out for motion at this high speed

Answers

Answer:

the required or need power is 115960.57 Watts  

Explanation:

First of all, we take down the data we can find from the question, to make it easier when substituting values into formulas.

mass of swordfish m = 650 kg

Cross - sectional Area A = 0.92 m²

drag coefficient C[tex]_D[/tex] = 0.0091

speed v = 30 m/s

density p = 1026 kg/m³

Now, we determine our Drag force F[tex]_D[/tex]

Drag force F[tex]_D[/tex]  = [tex]\frac{1}{2}[/tex] × C[tex]_D[/tex] × A × p × v²

Next, we substitute the values we have taken down, into the formula.

Drag force F[tex]_D[/tex]  = [tex]\frac{1}{2}[/tex] × 0.0091 × 0.92 × 1026 × (30)²

Drag force F[tex]_D[/tex]  = 4.294836 × 900

Drag force F[tex]_D[/tex]  = 3865.3524

Now, we determine the power needed P[tex]_w[/tex]

P[tex]_w[/tex] = F[tex]_D[/tex] × v

we substitute  

P[tex]_w[/tex] = 3865.3524 × 30

P[tex]_w[/tex] = 115960.57 Watts  

Therefore, the required or need power is 115960.57 Watts  

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