a concave mirror forms an errect image 30cm away from the object. If the image height is 2times the height of the object, find the object and image length. (ii) what is the focal length?​

Ball b is hanging from an inextensible cord. an identical ball a is released from rest when it is just touching the cord and drops through the vertical distance h a 5 8 in. before striking ball b. assuming e 5 0.9 and no friction, determine the resulting maximum vertical displacement h b of the ball b

Suppose you use a machine that gives you a mechanical advantage of 2 to achieve an output force of 30newtons what must the input force be

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant