Newton’s Second Law Homework 1. (i) A 5 kg mass is hanging from a string. What is the tension in the string? 2. (i) A 20 gram mass is hanging from a string. What is the tension in the string? 3. (i) A force of 50 N is observed to accelerate a cart at a rate of 4 m/s2. What is the mass of the cart? 4. (i) Calculate the acceleration of a 2000 kg single engine airplane just before takeoff when the thrust of the engine is 500 N? 5. (i) A force of 650 N is found to be able to accelerate a black box with an acceleration rate of 2.3 m/s2. What is the mass of the black box? 6. (ii) Wile E. Coyote has a mass of 30 Kg. He has a rocket strapped to his back that has a mass of 10 kg, and provides 900 N of thrust. What will be the acceleration of the coyote and rocket? (Questions 7-9) A car with a mass of 1200 kg can accelerate at a rate of 3.6 m/s2. 7. (i) What is the net force required to make this car accelerate like this? 8. (i) One the car reaches a speed of 25 m/s, it stops accelerating. What net force is needed for the car to maintain this speed? 9. (ii) In a second experiment, the same car with the same engine is observed to only accelerate at a rate of 3.2 m/s2. Approximately how many more people were in this car this time? (Justify your answer). 10. (iii) An electron is 0.001 m away from a stationary positive charge of 2 μC. a. What will be the acceleration of the electron? b. Assuming that the electron started from rest, what will be its velocity after 2 seconds?
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