Question

A farmer is lifting some moderately heavy rocks from a field to plant crops. He lifts a stone that weighs 180. What force does he apply if the stone accelerates at a rate of 1.5−2?

Answer 1

Answer:

No forces act in the horizontal direction, so we can concentrate on vertical forces, as shown in the following free-body diagram. We label the acceleration to the side; technically, it is not part of the free-body diagram, but it helps to remind us that the object accelerates upward (so the net force is upward).

w

=

m

g

m

=

w

g

=

180

N

9.8

m/s

2

=

18

kg

∑

F

=

m

a

F

−

w

=

m

a

F

−

180

N

=

(

18

kg

)

(

1.5

m/s

2

)

F

−

180

N

=

27

N

F

=

207

N

=

210

N to two significant figures

w=mgm=wg=180N9.8m/s2=18kg∑F=maF−w=maF−

Answer 2

Answer:

Explanation:

180.... What is the unit

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