Q1 A 240kg cannon fires a 1.8kg projectile. Calculate the velocity of the projectile if it takes 0.28s for the
projectile to accelerate up to its maximum speed, and the cannon recoils, reaching a maximum speed of
1.4ms-1

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.

Ways that industry and agriculture use physical properties to separate substances

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.