Problems are listed in approximate order of difficulty. A single dot (•) indicates straightforward problems involving just one main concept and sometimes requiring no more than substitution of numbers in the appropriate formula. Two dots (••) identify problems that are slightly more challenging and usually involve more than one concept. Three dots (•••) indicate problems that are distinctly more challenging, either because they are intrinsically difficult or involve lengthy calculations. Needless to say, these distinctions are hard to draw and are only approximate.
• A physics lecture demonstration uses a small cannon mounted on a cart that moves at constant velocity v across the floor. At what angle θ should the cannon point (measured from the horizontal floor of the cart) if the cannonball is to land back in the mouth of the cannon? Explain clearly your choice of frame of reference.
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