2. What feature of water molecules enables ionic substance to dissolve in water?
The water molecules have a certain shape that allows them to surround the ions
in solution.
® The water molecules react with the ions.
©
The water molecules are sticky and can adhere to the ions.
The water molecules are polar and are attracted to the positive and negative
ions, surrounding them.

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

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