If each of the three rotor helicopter blades is 3.75 mm long and has a mass of 135 kgkg, calculate the moment of inertia of the three rotor blades about the axis of rotation.

Explanation:

The computation of the moment of inertia of the three rotor blades is shown below:

Given that

Three rotor helicopter blades = 3.75 mm long

Mass = 135 kg

Based on the above information

As we know that

Axis at the end is

Now the total moment of inertia is

Hence, the moment of inertia of the three rotor blades is

We simply applied the above formula and the same is to be considered

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.