What is focal length of the lens

Reference no: EM1371356

Q. A convex lens is held over a piece of paper outdoors on a sunny day. When the paper is held 20cm below the lens, sunlight is focused on the paper and the paper ignites. What is focal length of the lens?

Q. A 35 g bullet moving at 475 m/s strikes a 4.20 kg bag of flour that is on ice, at rest. The bullet passes through the bag, leaving at 270 m/s. How fast is the bag moving when the bullet exits?

Reference no: EM1371356

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