They relate because the freezing of the water or the melting of the snowball are both a matter of transferring energy.
And yes, in our post-mortem of that exam, those who did not see past the red herring brought up the friction factor, as I recall the correct speed was right up there. The teacher reminded us that this was high school physics. And now I think of it, he worded the question so that the mass of the snowball was 500g at the moment it hit the wall, taking out the friction factor. But it would have made no difference, either, how densely the snowball was packed. A gram of water is a gram of water.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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