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dimaraw [331]
3 years ago
10

A small object with mass 1.30 kg is mounted on one end of arod

Physics
1 answer:
Julli [10]3 years ago
3 0

Answer:

(a) I_{system} = 1.014\ kg.m^{2}

(b) \tau = 0.0179\ N-m

Solution:

As per the question:

Mass of the object, m = 1.30 kg

Length of the rod, L = 0.780 m

Angular speed, \omega = 5010\ rev/min

Now,

(a) To calculate the rotational inertia of the system about the axis of rotation:

Since, the rod is mass less, the moment of inertia of the rotating system and that of the object about the rotation axis will be equal:

I_{system} = ML^{2} = 1.30\times (0.780)^{2} = 0.791\ kg.m^{2}

(b) To calculate the applied torque required for the system to rotate at constant speed:

Drag Force, F = 2.30\times 10^{- 2}\ N

\tau = FLsin\theta 90 = 2.30\times 10^{- 2}\times 0.780\times 1 = 0.0179\ N-m

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Answer:

<h2><em>6000 counts per second</em></h2>

Explanation:

If a sample emits 2000 counts per second when the detector is 1 meter from the sample, then;

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