A boy and his skateboard of total mass 60kg coasts down a frictionless ramp at an angle of 30º to the horizontal. (a) Calculate the normal force acting on the boy and skateboard.
(b) Calculate the net force acting on the boy and skateboard.

Which describes an image that can be produced by a concave lens? the image is real and smaller than the object. the image is virtual and larger than the object. the image is virtual and smaller than the object. the image is real and larger than the object.

Aclarinetist, setting out for a performance, grabs his 3.350 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 24.65 n. find the case's vertical acceleration. indicate an upward acceleration as positive and a downward one as negative.

A( developed during the process of technology design