List 4 ways that a researcher can affect his own research and provide examples to illustrate your choices.

example: Children in a day care center all behave in a well-mannered way when they realize they are being watched.-Researchers presence creates ' good subjects'.

Can someone explain to me how to do this problem ?

Ais not a compound machine. a. bolt b. shovel c. handcart (dolly) d. see-saw (teeter totter)

An electric current is flowing through the cord below.what will happen to this current if a magnet is brought near the cord? a. the electric current will stop flowing. b. it will exert a force on the voltage. c. the resistance of the wire will decrease. d. it will exert a force on the electric current.