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insens350 [35]
3 years ago
10

A box resting on a flat surface is pulled to the right with 20N of force and the left with 24N of force. In which direction does

the box move?

Physics
1 answer:
Fiesta28 [93]3 years ago
3 0
Left.
Forces going left are always negative and forces going right are always postive.



(-)24N. (+)20N
<-----------◼----------->
+20N -24N=
-4N
Left

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Vector A has a magnitude of 63 units and points west, while vector B has the same magnitude and points due south. Find the magni
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Given :

Vector A has a magnitude of 63 units and points west, while vector B has the same magnitude and points due south.

To Find :

The magnitude and direction of

a) A + B .

b) A - B.

Solution :

Let , direction in north is given by +j and east is given by +i .

So , A=-63i and B=63j

Now , A + B is given by :

A+B=-63i+63j

| A+B | = 63\sqrt{2}

Direction of A+B is 45° north of west .

Also , for A-B :

A-B=-63i-63j

|A-B|=63\sqrt{2}

Direction of A-B is 45° south of west .

( When two vector of same magnitude which are perpendicular to each other are added or subtracted the resultant is always 45° from each of them)

Hence , this is the required solution .

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a) What is the average useful power output of a person who does6.00×10^6Jof useful work in 8.00 h? (b) Working at this rate, how
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h = Height of platform = 1.5 m

Power is obtained when we divide energy by time

P=\frac{E}{t}\\\Rightarrow P=\frac{6\times 10^6}{8\times 60\times 60}\\\Rightarrow P=208.33\ W

The average useful power output of the person is 208.33 W

The energy in the next part would be the potential energy

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The time taken to lift the load is 141.26626 seconds

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