I will mark brainiest answerer pls A certain machine has an efficiency of 80% .Is the load moves a distance is 2m as the effort moves 8m, how large a force is required to lift a load of 320N?​

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

What sort of waves exhibit the doppler effect?