A ray of laser light strikes a glass surface at an angle Θa = 25.0˚ to the normal and it is refracted to an angle Θb = 18.5˚ to the normal. What is the index of refraction nb for this type of glass? Na= 1.00

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).

What equation is used to calculate the weight of an object on a plant ?