A hole in a brass plate has a diameter of 1.200 cm at 20C. What is the diameter of the hole when the plate is heated to 220C? The coefficient of linear thermal expansion for brass is 19 10-6 K-1.
A) 1.195 cm B) 1.200 cm C) 1.205 cm D) 1.210 cm
Question 2
A 30-year-old astronaut goes off on a long-term mission in a spacecraft that travels at speeds close to that of light.
The mission lasts exactly 20 years as measured on Earth. Biologically speaking, at the end of the mission, the astronaut's age would be
A) exactly 50 years.
B) exactly 25 years.
C) less than 50 years.
D) more than 50 years.
E) exactly 30 years.