Give a critical discussion on why hardness test needs to perform in engineering practice.
b) discuss 2 possible source of errors (other than parallax error) and how it's can effect the result.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

continuous conducting path for current, power supply

a sonic boom is a loud boom that breaks the sound barrier

explanation: