1.A cannon is fired horizontally from a platform (see figure). The platform rest
ID: 2287637 • Letter: 1
Question
1.A cannon is fired horizontally from a platform (see figure). The platform rests on a flat, icy, frictionless surface. Just after the shell is fired and while it is moving through the barrel of the gun, the shell (mass 2.8 kg) has an acceleration of +2725 m/s2. At the same time, the cannon has an acceleration of -0.84m/s2. What is the mass of the cannon?
kg
2.A book of mass 2.0 kg sits at rest on a horizontal table. What is the magnitude of the normal force exerted by the table on the book?
N
3.Twenty soldiers hold a long beam of heavy wood against a fortified castle door and attempt to push it open (see figure). If each soldier is able to supply a forward force on the beam of 60 N, what normal force does the castle door exert on the beam if the door does not open? (Enter the magnitude only.)
N
Explanation / Answer
1] F shell =- F retarding force of cannon
2.8* 2725= - m* -0.84
M cannon= 9083.3kg
2]
Fnormal= mg=2*9.8= 19.6N
3]
Fnormal balances the force applied by the 20 soldiers= 20*60=120N
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