A horizontal board of negligible thickness and area 4.0 m2 hangs from a spring scale that reads 60 N when a 2.0 m/s wind moves below the board. The air above the board is stationary. What does the scale read when the wind stops? The density of air is 1.25 kg/m^3?

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.

Acar jack with a mechanical advantage of 6 needs to produce an output force of 600 n to raise a car. what input force is required? 6 n 100 n 600 n 3,600 n

Which of the following are molecules? a. al b. ag c. mgcl2 d. nacl e. c3h8