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midterm1

# midterm1 - 1B Physics for Scientists and Engineers...

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1B Physics for Scientists and Engineers: Oscillations, Waves, Electricity and Magnetism Midterm #1. Wednesday 26th January. Instructor: Steve Cowley Please do not write in this region Question 1. Question 2. Total. Please write your answers in the space provided below. Partial credit is given for answers that are on the right track so show your working. You may use rough paper but please put the working on these sheets. Question 1. Oscillations of a Baby on a Spring. 20 points One way to keep your baby happy(sometimes) is to put it in a baby bouncer . This can be modelled as suspending the baby by an ideal spring and letting them perform simple harmonic motion – we will neglect the effects of the baby touching the ground. (a) The baby mass is 10 kg and we take (for simplicity) the gravitational acceleration to be g = 10 ms - 2 . When we put the baby in the harness the spring stretches by 1 m to the equilibrium position. Calculate the spring constant. 4 points 1

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(b) To get the baby oscillating we push it down 0 . 1 m from the equilibrium position and let it go from rest.
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