Name. Physics 111-01 General and Modern Physies Examination 3 (Take Home) April

Question

Name. Physics 111-01 General and Modern Physies Examination 3 (Take Home) April 11, 2018 Read each problem and question carefully. Problems must have due by Friday April 13, 2018 at 3:00 PM in my office.work I. A JUs is a unit of shown for credit.Exam is b. powerpotential difference d. kinetic energy orce of 50 N applied tangent to its a. work A solid disk of mass 10 kg with a 2.0 m diameter has a constant f rim. Assuming it starts from rest, how mach work is done in 5 s? 2. 3. True/ False: The period is defined as the number of complete oscillations per unit of time. 4 A simple pendulum will be in simple harmonic motion if its 5. State Kepler's Laws: is kept small. of the Kepler's Laws came from the extensive measurements by motion of the planets and hundreds of stars about the Sun. 6. and acts in the 7. In SHM the restoring force is directly proportional to the- direction. 8. Find the period and frequency of a suspended mass undergoing SHM if it undergoes 100 vibration in 75 s. 9. True/False: The SI unit of angular momentum is kg ms. 10. An electric motor turns at 250 rpm. What is the angular velocity?

Explanation / Answer

1. J/s = Watt

Unit of power

Ans(b)

2. torque = R F

torque = I alpha

(R F ) = (M R^2 /2) alpha

alpha = 2 F / M R = 10 rad/s^2

I = M R^2 /2 = 10 x 1^2 / 2 = 5 kg m^2

w = w0 + alpha t

w = 0 + (10 x 5) = 50 rad/s

Work done = change in KE

= I w^2 / 2 - 0

= (5)(50^2)/2

= 6250 J

3. period -> time taken to complete 1 osccilation.

False

4. angle

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