A gas burner applied 6000 J of thermal energy to a system that caused the internal energy of the system to increase by 4000 J. What accounts for the missing 2000 J of energy?

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

What are atoms of the same element with varying number of neutrons