Question 1: An object of mass 4kg is attached to a spring. The equilibrium position of the object is .4m from the point where the spring exerts no force on the object. What is the spring constant, k in N/m?
10
80
100
150
200
Question 2: An electric motor accelerates its rotation with a constant angular acceleration of 2 rad/s
2
until it reaches a frequency of f = 10/¶ Hz. If the motor starts from rest, how long does it take to reach frequency f?
6s
10s
11s
12s
15s
Question 3:
An object of mass 10kg sitting on a frictionless horizontal plane is moved from a stationary state by the force shown above. What is the velocity of the object at time t = 5s, in m/s?
2.5
3
4
5
6
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