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Chapter 7: Q56P (page 170)
Assume that your proportions are the same as those in Table 7鈥�1, and calculate the mass of one of your legs.
The mass of one of your legs is \(10.89\;{\rm{kg}}\).
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A 725-kg two-stage rocket is traveling at a speed of \({\bf{6}}{\bf{.60 \times 1}}{{\bf{0}}^{\bf{3}}}\;{\bf{m/s}}\) away from Earth when a predesigned explosion separates the rocket into two sections of equal mass that then move with a speed of \({\bf{2}}{\bf{.80 \times 1}}{{\bf{0}}^{\bf{3}}}\;{\bf{m/s}}\)relative to each other along the original line of motion.
(a) What is the speed and direction of each section (relative to Earth) after the explosion?
(b) How much energy was supplied by the explosion? [Hint: What is the change in kinetic energy as a result of the explosion?]
With what impulse does a 0.50-kg newspaper have to be thrown to give it a velocity of \({\bf{3}}{\bf{.0}}\;{{\bf{m}} \mathord{\left/{\vphantom {{\bf{m}} {\bf{s}}}} \right.\\} {\bf{s}}}\)?
A block of mass\(m = 2.50\;{\rm{kg}}\)slides down a 30.0掳 incline which is 3.60 m high. At the bottom, it strikes a block of mass\(M = 7.00\;{\rm{kg}}\)which is at rest on a horizontal surface, Fig. 7鈥�47. (Assume a smooth transition at the bottom of the incline.) If the collision is elastic, and friction can be ignored, determine (a) the speeds of the two blocks after the collision, and (b) how far back up the incline the smaller mass will go.
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