Newton�s Second Law Homework by TIq5UMYf

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									                                       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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