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10. A car salesperson claims that a 300-hp engine is a necessary option in a compact car, in place of the conventional 130-hp engine. Suppose you

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10. A car salesperson claims that a 300-hp engine is a necessary opTon in a compact car, in place of the convenTonal 130-hp engine. Suppose you intend to drive the car within speed limits (≤ 65 mi/h) on Fat terrain. How would you counter this sales pitch? 3. A block of mass 0.250 kg is placed on top of a light, verTcal spring of force constant 5 000 N/m and pushed downward so that the spring is compressed by 0.100 m. A±er the block is released from rest, it travels upward and then leaves the spring. ²o what maximum height above the point of release does it rise? 6. A block of mass m = 5.00 kg is released from point and slides on the fricTonless track shown in ³igure P8.6. Determine (a) the block’s speed at points and and (b) the net work done by the gravitaTonal force on the block as it moves from point to point . 12. A sled of mass m is given a kick on a frozen pond. ²he kick imparts to the sled an iniTal speed of 2.00 m/s. ²he coe´cient of kineTc fricTon between sled and ice is 0.100. Use energy consideraTons to µnd the distance the sled moves before it stops. 43. A boy starts at rest and slides down a fricTonless slide as in ³igure P8.43. ²he bo¶om of the track is a height h above the ground. ²he boy then leaves the track horizontally, striking the ground at a distance d as shown. Using energy methods, determine the iniTal height H of the boy above the ground in terms of h and d.
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