An iron nail is driven into a block of ice by a
single blow of a hammer. The hammerhead
has a mass of 0.6 kg and an initial speed of
1 m/s. Nail and hammer are at rest after the
blow.
How much ice melts? Assume the temperature of both the ice and the nail is 0◦C before
and after. The heat of fusion of ice is 80 cal/g.
Answer in units of g.

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

Orange juice has a lower or higher viscosity than chocolate syrup

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?