If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is
a. 40 degrees.
b. 80 degrees.
c. 90 degrees.
d. 0 degrees.

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules

The weights of bags filled by a machine are normally distributed with a standard deviation of 0.05 kilograms and a mean that can be set by the operator. at what level should the mean weight be set if it required that only 1% of the bags weigh less than 9.5 kilograms? round the answer to 2 decimal places.

Which inventor was often called the lady edison