cq_1_261

phy201

Your 'cq_1_26.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.

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Seed 26.2

A simple pendulum has length 2 meters. It is pulled back 10 cm from its equilibrium position and released. The tension in the string

is 5 Newtons.

Sketch the system with the pendulum mass at the origin and the x axis horizontal.

answer/question/discussion: ->->->->->->->->->->->-> :

So the sketch would have the pendulum hanging from a string length of 2 meters. In the horizontal direction the pendulum would be

pulled back 10 cm and released giving a force that swings the pendulum from equilibrium to opposite postion and back to equilibrium.

The tension is on the string 5 newtons with gravity acting on it vertically downward.

#$&*

Sketch a vector representing the direction of the pendulum string at this instant. As measured from a horizontal x axis, what is the

direction of this vector? (Hint: The y component of this vector is practically the same as the length; you are given distance of the

pullback in the x direction. So you know the x and y components of the vector.)

answer/question/discussion: ->->->->->->->->->->->-> :

The dirction of the pendulum string is vertical 90 degrees from the horizontal

so The direction of this vector is y=2 sin (90degrees)

The pendulum is pulled back from vertical so it isn't at 90 degrees with horizontal.

#$&*

What is the direction of the tension force exerted on the mass?

answer/question/discussion: ->->->->->->->->->->->-> :

The direction of tension force exerted on the mass is in vertical position

t= 5n sin (90)

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What therefore are the horizontal and vertical components of the tension?

answer/question/discussion: ->->->->->->->->->->->-> :

#$&*

What therefore is the weight of the pendulum, and what it its mass?

answer/question/discussion: ->->->->->->->->->->->-> :

#$&*

What is its acceleration at this instant?

answer/question/discussion: ->->->->->->->->->->->-> :

#$&*

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about 45 minutes

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I am really confused on this one, I somewhat understood the problems in query 25.2,and tried to compare the answer to come up with a solution but I am really confused on how to work these.

The discussion at the link should clarify this for you. You should submit a revision.

&#Please compare your solutions with the expanded discussion at the link

Solution

Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified. &#