A ball is thrown straight up and reaches a maximum height in 8.33 s.
What was its initial speed? The accelera-
tion of gravity is 9.8 m/s2
Answer in units of m/s.

If you mix chlorine lithium in nickel together which two elements would be the most reactive

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?