a crowbar 2 metres long is used to lift a rock weighing 800 newtons .If the fulcrum is 0.25 metre, from where the bar touches the rock, how much effort must be applied to move the rock

Asign is hung between two cables as illustrated below. if the sign weighs 350 n, what is the tension (in n) in each cable?

Look at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way

Aball is fired with an initial velocity of 500 m/s at an angle of 30 degrees above the horizontal across a level field. a. what are the horizontal and vertical components of the initial velocity. b. calculate the maximum height, the time of flight, and the range of the ball.