Which is an example of an object with a momentum of zero?(1 point) A) a car rolling down a hill
B) a swimmer diving off the starting block
C) a puck sliding across the top of an air hockey table
D) an empty canoe sitting on the bank of a river***
***means the answer I think

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Which of the following is the result of the nuclear weak force? the instability of large nuclei the repelling force between positively charged protons the structure of the atom certain types of nuclear decay

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples