Statements: (1) In outer space, an astronaut may be weightless but never massless.
(2) The metric system prefixes milli and micro differ in mathematical meaning by a factor of 1000.
(3) The addition of 273 to a Fahrenheit temperature reading will convert it to a Kelvin temperature reading.

Question

Quizplus · Accepted Answer

Statement 1 is true. Weight is a measure of the gravitational force acting on an object, while mass is a measure of the amount of matter in an object. In space where gravitational force is negligible, an astronaut may be weightless but still has mass.
Statement 2 is true. Milli is a prefix denoting one-thousandth, while micro is a prefix denoting one-millionths. Therefore, the difference in mathematical meaning between milli and micro is a factor of 1000.
Statement 3 is false. To convert Fahrenheit to Kelvin, you need to subtract 32, multiply by 5/9, and add 273.15, not 273. Therefore, statement 3 is false.

Statements: (1) in Outer Space, an Astronaut May Be Weightless