Answer:
During start total turns
After half of the time total turns
Total number of turns during it stop
After half of the time total turns
Explanation:
Initially the machine is at rest and then starts rotating with speed 3550 rev/min
now we will have
now we know that it took 10 s to reach the speed
so angular acceleration is given as
now it stops in 31 s so the angular deceleration is given as
now initially number of turn to reach the given speed
number of turns during it stop
Now during startup speed after t = 5 s is given as
now during it stop the speed after half the time is given as
now the number of turns is given as
Thermal energy also known as 'heat energy' is a form of kinetic energy.
Let the distance between points a and b = d
For the women starting from a her velocity be 
and for the women starting from b her velocity be 
Let the rising time of sun = x AM
We have = 
and we also have = 
At they meet means, they both travel a combined distance of d
So we have 
Substituting velocity values we will get
x= 6 AM or 18 AM, but 18 AM is not possible,
Sun rise time is 6 AM
Explanation:
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Answer:
c) is negative
Explanation:
As we know that work done by a force is the product of force and displacement vector.
W= F.d
F= Force
d= displacement
The work done by friction force always negative because it try to oppose the motion and act opposite to the direction of displacement.So the work done by air resistance is negative.
c) is negative
