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RUDIKE [14]
3 years ago
5

Which of the following is an example of a lever? knife ramp pencil sharpener wheelbarrow

Physics
2 answers:
Kay [80]3 years ago
5 0
I believe it is a knife
Olegator [25]3 years ago
4 0
Ramp is an example of an lever
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If the voltage impressed across a circuit is held constant while the resistance doubles, what change occurs in the current?
bazaltina [42]

Answer:

The current halves

Explanation:

The relationship between voltage, current and resistance in a circuit is given by Ohm's law:

V=RI

where

V is the voltage

R is the resistance

I is the current

We can rewrite the formula as

I=\frac{V}{R}

we see that I is directly proportional to V and inversely proportional to R.  In this problem, V is held constant while R is doubled:

R'=2R

so, the new current in the circuit will be

I'=\frac{V}{R'}=\frac{V}{2R}=\frac{1}{2}I

So, the current halves.

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4 years ago
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xxTIMURxx [149]

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7 0
3 years ago
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AfilCa [17]

C

Explanation:

This is because the other variables in the other choices are relative to different observers and hence are not good to use in an experiment because there will be a lot of inherent bias by the person conducting the experiment For example how one person views how strong or beautiful the maple or oak looks may be different from how another person perceives the same.

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