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PHY101 - Physics Assignment No. 02 Solution and Discussion Fall 2013 Due Date: 09 /1 2 /2013

Assignment 2: (Fall 2013)
PHYSICS (PHY101)
TOTAL MARKS: 35
Due Date: 09/12/2013
DON’T MISS THESE Important instructions:
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Question # 1
Find out the magnitude and direction of the overall acceleration in the fig shown? Marks = 6
Question # 2
In its natural state, an average of 5.5×106Kg of water flowed per second over Niagara Falls, falling 55m. If all the work done by gravity could be converted into electric power as the water fall to the bottom, how much power would the falls generate? Marks = 8
Question # 3
The solid uniform disk rolls without slipping. What is its kinetic energy as shown figure? Marks =8
Question # 4
How much work is done when the wheel rotates shown in the figure? Marks = 6
Question # 5
The tunable shown above makes a record rotate at 33.3 revolutions per minute. If the linear speed of an ant located at radius r is v, what is the linear speed of a point on the outer edge of the record at radius 3r? Marks = 3+4
a. also v
b. 1\3v
c. 3v
d. 9v
e. 6v
Write the reason of your above selected choice as well.
…………Good Luck…………>>>>>>>>>>>>

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1st question

 

Bonnie sits on the outer rim of a merry-go-round, and Klyde sits midway between the center and the rim. The merry-go-round makes one revolution every two seconds.

 

Who has the larger linear (tangential) velocity?

 

 

 

 1) Klyde

2) Bonnie

3) Both the same

4) Linear velocity is zero for both of them

 

Reason:

Their linear speeds v will be different since v = Rω and Bonnie is located further out (larger radius R) than Klyde.

 

2nd question

 

Bonnie sits on the outer rim of a merry-go-round, and Klyde sits midway between the center and the rim. The merry-go-round makes one complete revolution every two seconds.

 

Klyde’s angular velocity is:

 

1) Same as Bennie’s

) twice Bennie’s

) half of Bonne’s

4) 1/4 of Bonne’s

5) Four times Bonne’s

 

 

Reason:

The angular velocity ω of any point on a solid object rotating about a fixed axis is the same. Both Bonnie & Klyde go around one revolution (2π radians) every two seconds.

ω = θ / t  

Regards

good work all fellows, God bless u and thanks.

Thanks to All fellows ;)

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