Use the table to answer the question A skateboarder flies horizontally off a cement planter. After 3 seconds the skateboarder
lands on the ground with a final velocity of -4.5 m/s. Which kinematic equation would be
most useful for finding the skateboarder's initial velocity? (Assume a = -9.8)

B

C or E

D

A

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

Avoltaic cell converts chemical energy to