Mechanics: Momentum and Collisions
Momentum and Collisions: Audio Guided Solution
Extra Problem 13:
A 1.5-kg cannon is mounted on top of a 2.0-kg cart and loaded with a 66.5 gram ball. The cannon, cart, and ball are moving forward with a speed of 2.65 m/s. The cannon is ignited and launches a 66.5 gram ball forward with a speed of 103 m/s. Determine the post-explosion velocity (in m/s) of the cannon and cart. Include a + sign for a forward velocity and a - sign for a backward velocity.
Audio Guided Solution
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Habits of an Effective Problem Solver
An effective problem solver by habit approaches a physics problem in a manner that reflects a collection of disciplined habits. An effective problem-solver...
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...reads the problem carefully and develops a mental picture of the physical situation. If needed, they sketch a simple diagram of the physical situation to help visualize it.
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...identifies the known and unknown quantities in an organized manner, often times recording them on the diagram iteself. They equate given values to the symbols used to represent the corresponding quantity (e.g., vo = 0 m/s; a = 4.2 m/s/s; vf = 22.9 m/s; d = ???.).
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...plots a strategy for solving for the unknown quantity; the strategy will typically center around the use of physics equations be heavily dependent upon an understaning of physics principles.
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...identifies the appropriate formula(s) to use, often times writing them down. Where needed, they perform the needed conversion of quantities into the proper unit.
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...performs substitutions and algebraic manipulations in order to solve for the unknown quantity.