In a certain pinhole camera, the screen is 10 cm from the pinhole. when the pinhole is placed 6 cm away from a tree ,a sharp imageof a tree 16 cm high if formed on the screen. find height of the tree

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Which articulations allow for greatest range of motion?

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.