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)

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 :

d is the height at which the backpack is lifted

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 = 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.

a women have faced negative attitudes in some areas , but other

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.