Aburning candle is covered by a jar as shown in the picture. the whole arrangement has a mass of 500 g. what will be the approximate mass of the arrangement when the candle is completely burnt, after four minutes? a) 0 g b) 50 g c) 250 g d) 500 g

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

Why do electron microscopes have higher resolving power than light microscopes?

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.