Aballoon is buoyed up with a force equal to the
a) weight of air it displaces.
b) density of surrounding air.
c) atmospheric pressure.
d) weight of the balloon and contents.

What is magnetic flux? explain faraday's law of induction.

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

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank