A pulley is used to raise a flag on a flagpole outside the school. The student applies a force of 18 Newtons to the pulley and the pulley applies a force of 21 Newtons to the flag. What is the mechanical advantage of the pulley?

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?

What is the relationship between the direction of motion of the balloon and the wind currents