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Q. An indestructible bullet 2 cm long is fired straight through a board that is 10 cm thick. The bullet strikes the board with a speed of 480 m/s and emerges with the speed of 265 m/s. (To simplify, assume that bullet accelerates only while the front tip is in contact with the wood.)

What is the average acceleration of bullet through board?

Q. A 64 Ω resistor is connected in parallel with a 115 Ω resistor. This parallel group is connected in series with a 20 Ω resistor. The total combination is connected across a 15V battery.(a) Find the current in the 115 Ω resistor.(b) Find the power dissipated in the 115 Ω resistor.

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