Aceiling fan with 80-cm-diameter blades is turning at 70 rpm . suppose the fan coasts to a stop 30 s after being turned off. part a what is the speed of the tip of a blade 10 s after the fan is turned off

The speed of the tip of a blade 10 s after the fan is turned off is 2.834m/s

The formula to be used to get the velocity of the tip of a blade is expressed as:

is the angular velocity

r is the radius of the ceiling fan

r = 80/2 = 40cm

To get the angular velocity, we will use the formula as shown:

is the angular acceleration

Get the angular acceleration:

Get the final angular velocity

Get the required speed of the tip of the blade.

Hence the speed of the tip of a blade 10 s after the fan is turned off is 2.834m/s

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1.97 m/s

Explanation:

The initial angular velocity of the blades is:

The final angular velocity is

(since the blades come to a stop)

and the time taken is

t = 30 s

So, the angular acceleration of the blades is

Now we can find the angular velocity of a blade after a time t=10 s:

The distance of the tip of a blade from the centre is equal to half the diameter, so

so, the speed of the tip of a blade is

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is