Homework !

Homework #12: Review for Test 3.

Course

Please type your name:

Please type your LAST NAME and LAST FOUR SS# digits:

IN:
The first three questions refer to the material you were to read in preparation for the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle. Questions 4 is your opportunity to suggest what we should emphasize today and how.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button at the bottom of this page.


1.

Write the equation(s) used in the following problem. A 20 kg sphere with radius 2 m rolls on table top with a speed of 30 m/s. What is it's total kinetic energy?




2.Write the equation(s) used in the following problem. A box car is traveling around a circular track of radius 50 m completing one revolution every 30 seconds. If this boxcar is shunted onto an inner track of radius 30 m, assuming no loss of energy due to friction, how long does it take to make one revolution on this inside track?





3.Write the equation(s) used in the following problem. If a pulley of radius 2 m and a rotational mass of 50 kg m2 has a weight of 40 N attached by a rope, what will be it's angular acceleration?

 




4.Write the equation(s) used in the following problem. If a 3 m moment arm has a force applied at an angle of 30o cw with respect to the line of action of the moment arm, what is the torque applied to the pivot point?




5.Explain how you would obtain direction as to the left or right relative to the person riding the bike for the following angular vectors. If a bicycle is moving forward and slowing down, what is the direction of it's

angular momentum?

angular acceleration?

the torque due to the force of friction of the road on the tire??




6.Write the equation(s) used in the following problem. If a meter stick pivoted from its zero end has a mass of 500 g (this is a beautiful brass meter stick), how much force must be applied to the other end to keep it from rotating?




 

7. Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.):




You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button.

I received no help from anyone on this assignment.