1. If you walk 3 kilometers in 30 minutes, what is
your average speed in
kilometers per hour?
2. What distance will a
truck travel in 3 hours at
an average speed of 50
miles per hour?

Stion 13 of 20 : select the best answer for the question. 13. if a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°c, what will be the volume at 50°c? a. 0.002021624 m3 b. 0.004021624 m3 c. 0.000010812 m3 d. 0.002010812 m3

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system