What type of charge do individual hair strands have when standing on end due to static electricity? A. Neutral charges
B. neutral discharge
C. permanent positive charges
D. temporary positive charges

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong chain

When an object is heated it contracts. a. true b. false

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories