A student fires a cannonball diagonally with a speed of 21 m/s from a height of
43m as shown. Neglect drag. Determine all unknowns and answer the following
questions.
How long did the ball rise?
seconds
What was the ball's maximum height above the ground? meters
How long did the ball remain in the air?
seconds
How far from the base of the building did the ball land?
meters
How fast was the ball moving as it struck the ground?
m/s -
At what angle (with the horizontal) did the ball land?

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.