Fluid dynamics and Heat transfer. Lecture 2. Noor Shazliana Aizee Bt Abidin. FORMS OF ENERGY. THERMAL ENERGY – HEAT CHEMICAL ENERGY – IN FUELS OR BATTERIES KINETIC ENERGY – IN MOVING SUBSTANCES ELECTICAL ENERGY GRAVITATIONAL ENERGY – POTENTIAL ENERGY OTHERS. EQUATIONS, UNITS.
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Noor Shazliana Aizee Bt Abidin
total momentum before = total momentum after
(m1v1 + m2v2)before = (m1v1 + m2v2)after
We can attack this problem using the conservation of momentum formula in equation above. Before the cannon is fired we know that its velocity, vc, is zero and the velocity of the cannonball, vb, is zero.
(mcvc + mbvb) = (500 kg x 0 m/s + 10 kg x 0 m/s) = 0
(500 kg x vc + 10 kg x 200 m/s) = 0
(500 kg x vc + 2000 kg.m/s) = 0
500 kg vc = -2000 kg.m/s
vc = -4 m/s