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Brums [2.3K]
3 years ago
10

A 70 watt light bulb is run by a 120 v circuit. how many amps does it use

Physics
1 answer:
Marizza181 [45]3 years ago
6 0
Current = Power/Voltage. 70W/120v= 0.583 Amps.
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As the car falls off the cliff, what is happening to the kinetic energy of the falling car?
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The kinetic energy is increasing as potential energy is converted.

Explanation:

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What do you need to know to be able to determine how far a projectile travels horizontally?
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What minimum speed does a 200 g puck need to make it to the top of a frictionless ramp that is 4.1 m long and inclined at 22 ∘?
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Answer:

5.5 m/ sec

Explanation:

Because the inclined surface is frictionless so we can assume that total change of energy is zero

i-e ΔE = 0

Or we can say that difference between final and initial energy is zero i-e

Ef- Ei =0

Where,

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Ei= Initial energy at the bottom of the ramp=KEi+PEi

So we have

(KEf+PEf)-(KEi+PEi)=0

==>KEf-KEi+PEf-PEi=0            -------------(1)

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Where h= Sin 22 = h/d= h/4.1

or

0.375×4.1=h

or h= 1.54 m

So, PEf= 200×9.8×1.54=3018.4 j

and KEf= 1/2 mVf^{2}= 0.5×200×0=0 j

PEi= mgh = 200×9.8×0=0 j

KEi= 1/2 mVi^{2}=0.5×200×Vi^{2}=100Vi^{2} j

Put these values in eq 1, we get;

0-100 Vi^{2}+3018.4-0=0

-100 Vi^{2}=-3018.4

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==>  Vi = \sqrt{30.184}  = 5.5 m.sec

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2 years ago
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