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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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