What is the length of a string with a mass of 2.5 kg, with a tension of 20 N, if the speed of wave on the string is 2 m/s?
a 0.8 m
b 0.4 m
C 0.5 m
d 1.0 m
e 0.1 m

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation

Which statement correctly describes the interaction between magnetic poles? north and south poles attract each other. north and south poles repel each other. two north poles will attract each other. two south poles will attract each other.