Which of the following elements is in Group 2?
1 answer:
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To solve this we are going to use the formula for work: 
where
is the work done
is the force
is the distance
Scenario A. We know for our problem that
and 
. Lets replace those values in our formula to find :
Scenario B. We know for our problem that
and 
. Lest replace those value in our formula:
Scenario C. We know for our problem that
and 
. Lets replace the values in our formula:
We can conclude that:
- The scenario that requires the most work is C.
- The scenario that requires the least work is A.
where
Scenario A. We know for our problem that
Scenario B. We know for our problem that
Scenario C. We know for our problem that
We can conclude that:
- The scenario that requires the most work is C.
- The scenario that requires the least work is A.
Answer:
(a)
(b) 4.17 rev
(c) 6.40 sec
Explanation:
We have given the angular velocity of fan decreases from 550 rev/min to 180 rev/min
So initial angular speed
Final angular speed
Time is given as t = 4.3 sec
(a) We know that angular acceleration is given by
(b) We know the relation \Theta =\omega _0t+\frac{1}{2}\alpha t^2=9.166\times 4.3-\frac{1}{2}\times 1.43\times 4.3^2=26.1935rad=\frac{26.1935}{2\pi }=4.17rev
(c) Now final angular velocity
So time