Suppose a special kind of glass has a refractive index which decreases from 2.4 to 2.0 when heated above 50°C. By how much does the critical angle of this glass increase when heated? Give your answer in degrees, without a unit and to two significant figures.

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)

The ph is the a.independent variable b.the dependent variable c.control group

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly