A weather reporter says, “It is 20 degrees Fahrenheit. But with a wind speed of 30 miles per hour, the windchill factor makes it feel much colder.” Use the table to determine how cold the air will feel with the windchill factor accounted for.

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.