Ablock of mass m = 75 kg is hanging on a vertical rope of length l = 12 m. what work is done by the
gravitational force when the block swings to a position where the rope makes an angle θ = 40° with
the vertical?

2100 J

Explanation:

Draw a picture.  Notice that the rope forms a triangle, where the hypotenuse is L and the height is L cos θ.  The height of the mass is h.  The total height is L, so:

L = h + L cos θ

h = L − L cos θ

The work done by gravity is force times distance:

W = mgh

W = mg (L − L cos θ)

W = (75 kg) (9.8 m/s²) (12 m − 12 m cos 40°)

W = 2063 J

Rounding to two significant figures, the work done is 2100 J.

i'm thinking more like energy

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..