These are review questions for a test that I am havingproblems with, please help

Question

These are review questions for a test that I am havingproblems with, please help! 1. A force of ten newtons holds an ideal spring with a 20 N/mspring constant in compression. the potential energy stored in thespring is? 2. At one instant of time a rocket is travelling in outerspace at 2500 m/s and is exhausting fuel at a rate of 100 kg/s. Ifspeed of fuel as it leaves the rocket is 1500 m/s relative to therocket the thrust is? These are review questions for a test that I am havingproblems with, please help! 1. A force of ten newtons holds an ideal spring with a 20 N/mspring constant in compression. the potential energy stored in thespring is? 2. At one instant of time a rocket is travelling in outerspace at 2500 m/s and is exhausting fuel at a rate of 100 kg/s. Ifspeed of fuel as it leaves the rocket is 1500 m/s relative to therocket the thrust is?

Explanation / Answer

F = kx 10 = 20x x = 0.5 m PE = 0.5 * k * x2 PE = 0.5 * 20 * (0.5)2 PE = 2.5 J Remember thrust is just a force F = ma You can rearrange the info you have to get m and a. (100 kg/s) * (1500 m/s) (100 kg) * (1500 m/s2) F = (100 kg) * (1500 m/s2) F = 150000 N

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