Which of the following best represents potential energy being converted to kinetic energy?
1)a roller coaster starts at the top of a hill and then rolls down the hill.
2)a pitcher throws a baseball, and then the batter hits a homerun
3)a man jogs around the block and then stops to drink an energy drink
4)a woman peddles her bicycle across town and back again.

Apossible explanation for a set of facts that can be tested by further investigation is called

The vapour pressure of benzene is 53.3 kpa at 60.6 °c, but it fell to 51.5 kpa when 19.0 g of a non-volatile organic compound was dissolved in 500 g of benzene. calculate the molar mass of the compound.

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.