How much work is done by a 45 N force acting 35 degrees above the horizontal in pulling a block 9 m across a horizontal surface?

Question

Numerical answer only please

Answer 1

W=F d cos(theta)=45 x 9 cos(35) = 331.76 J

 

Jim

Answer 2

Hi Sierra;

Force=45N, 35-degrees above horizontal

Distance=9m

 

Work=(force)(distance)

 

The issue created by the degrees above horizontal is that a triangle is created.  We need to understand the horizontal force of this triangle.

The hypotenuse is = 250N

We need the value of the adjacent...

adjacent/hypotenuse

Therefore, we need the value of the cos of 35-degrees.

 

 

45N (cos 35-degrees)=45N(0.82)=36.9N

Work=(36.9N)(9m)=332 joules

Answer 3

330 joules.