Physics: 5) you did 170 joules of work lifting a 140 n backpack. how high did you lift the backpack? 6) in problem 5 how much did the backpack weigh in pounds (hint there are 4.45 newtons in one pound)

5) you did 170 joules of work lifting a 140 n backpack.

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14.01.2022

d = 1.21 meters

The mass of the backpack is 31.48 pound.

Explanation:

(5) Work done in lifting a backpack, W = 170 J

The force acting on the backpack, F = 140 N

The work done by an object is given by :

$W=F\times d$

d is the height at which the backpack is lifted

$d=\dfrac{W}{F}$

$d=\dfrac{170\ J}{140\ N}$

d = 1.21 meters

So, the backpack is lifted to a height of 1.21 meters.

(6) If m is the mass of the backpack. It can be calculated as :

W = mg

$m=\dfrac{W}{g}$

$m=\dfrac{140}{9.8}$

m = 14.28 kg

Since, 1 kg = 2.204 pound

14.28 kg = 31.48 pound

So, the mass of the backpack is 31.48 pound. Hence, this is the required solution.

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