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.

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.