An iron rod of length 50m and at a temperature of 80°c  is heated 90°c calculate it new length linear expansivity of iron is 1.2×10^-5k^-1

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

To a of 4 x hz is 1. 0. mm nm nm

Abeam of light shining from water to air strikes the surface at an angle greater than 48 degrees and produces total internal reflection. if the incident beam is at a 50 degree angle what angle is the reflected beam 13 25 50 100