Posted by andrew on Saturday, September 9, 2006 at 3:31pm.
A cannon that is 10m long is designed to launch a 10kg ball over a castle wall.
In order to do this the ball must have a speed of at least 50m/s as it exits the
cannon. For every 10kg of explosives used, the force on the ball in the cannon
increases by 1000N. How many kg of explosives should they use?
2 Gravitation(100pts.)
it a substance that their molecurle can be identified
Two 2.2 kg physical science textbooks on a bookshelf are 0.29 m apart. What is the magnitude of the gravitational attraction between the books?
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