4 years ago

A child carries a 3N book at a constant velocity 4 meters across a horizontal floor. What is the net work done?

1 answer:

5 0

Note that 4 m (meters) has the units of distance, not velocity.

By definition,
Work = Force x Distance
Therefore if a 3 N book is carried over a distance of 4 m, the work done is
3 *3 4 = 12 J

Answer: 12 J

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klasskru [66]

Answer:

The value is $F_B = 1.074 *10^{-11} \ N$

Explanation:

From the question we are told that

The mass of the lithium nucleus is $m = 6.02 \ u = 6.02 * 1.66*10^{-27} = 9.9932*10^{-27}\ kg$

The radius is $r = 0.536 \ m$

The speed of the lithium nucleus is $v = 0.08 c = 0.08 * 3.0*10^{8} = 2.40*10^{7} \ m/s$

Given that the lithium nucleus is travelling in a circular path, the magnetic force will be equivalent to a centripetal force so

$F_B = F_C$

And $F_C[tex] is centripetal force mathematically represented as [tex]F_C = \frac{m * v^2}{r}$

$F_B = F_C = \frac{m * v^2}{r}$

=> $F_B = F_C = \frac{9.9932*10^{-27} * [2.40*10^{7}]^2}{ 0.536}$

=> $F_B = 1.074 *10^{-11} \ N$

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if both are drop in water iron block sink to bottom while float on the level

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Answer:b

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