Question

For a scientific experiment, a physicist must make sure that the temperature of metal at 0° C gets no colder than -80° C. The physicist changes the metal's temperature at a steady rate of -4° C per hour. For how long can the physicists change the temperature?

Answer 1

Answer:

We conclude that the physicists can change the temperature 20 hours.

Step-by-step explanation:

We know that a physicist must make sure that the temperature of metal at 0° C gets no colder than -80° C. The physicist changes the metal's temperature at a steady rate of -4° C per hour. We calculate how long can the physicists change the temperature. We get:

$t=\frac{-80-0}{-4}=\frac{80}{4}=20$

We conclude that the physicists can change the temperature 20 hours.