Author Question: A 66-kg woman runs up a flight of stairs having a rise of 4.0 m in a time of 4.2 s. What average ... (Read 138 times)

BrownTown3 · **on:** Jul 28, 2018

A 66-kg woman runs up a flight of stairs having a rise of 4.0 m in a time of 4.2 s. What average power did she supply?
a. 380 W
c. 620 W
b. 560 W
d. 670 W

Question 2

The charge per unit length on an insulator is . On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are more electrons than protons.
b. There are more protons than electrons.
c. There are more protons than electrons.
d. There are more electrons than protons.