A 100kg astronaut is preparing to walk on the moon he knows that on earth he has 980N on Mars he has a weigh of 160n he knows that the acceleration from gravity on earth 9.8m/s/s and the acceleration from gravity on the moon is 1.6m/s/s

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.

J. j. thomson’s experiment disproved the theory that an atom

Are formed where bumps from two surfaces come into contact ?