1) Shayla is sliding in a sled from a top of a 5-m-high snow hill (...
1)
Shayla is sliding in a sled from a top of a 5-m-high snow hill ( starting from rest.) At the bottom of the hill, her sled hits Tom, who falls into the sled.
Toms's mass is the same as Shayla's and her sled altogether. What is the speed of the sled after Tom fell in? Neglect friction w/ snow.
2)
You are standing by a smooth frozen lake, and longing to propel a snowball over the lake. In which case will your snowball reach farther: if you throw it through the air, or if you send it sliding over the ice? Assume the same initial speed in both cases.
Neglect air resistance. The kinetic friction coefficient between the snowball and the ice is 0.05
Homework Answers
Concept: first we find out the speed of the sled at bottom of the hill using conservation of energy principle and then use momentum conservation principle to find the velocity after Tom falls in
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EXAMPLE 1.1 Headfirst into the snow Alice is sliding along a smooth, icy road on her sled when she suddenly runs headfirst into a large, very soft snowbank that gradually brings her to a halt. Draw a motion dia- gram for Alice. Show and label all displacement vectors. MODEL Use the particle model to represent Alice as a dot. VISUALIZE FIGURE 1.11 shows Alice's motion diagram. The problem statement suggests that Alice's speed is very nearly constant until she hits...
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