Question #115768

There is a close "Big Ben" in London Fasting 60.0 kg, the long needle is 4.50 m long and weighs 100.0 kg. It has a rotating axis The kinetic love of love can go into circulation for an impossible two years. The left face is scaly Consider a long narrow rod with a distributed mass.

Expert's answer

**Solution.**

"m_1=60kg;"

"m_2=100kg;"

"l=4.50m;"

"\\upsilon=\\dfrac{2\\pi R}{T};"

The period of rotation of the needle:

"T=12 hr=43200 s;"

Needle rotation speed:

"v=\\dfrac{2\\sdot3.14\\sdot4.50m}{43200s}=0.0006541m\/s;"

Kinetic energy of needle movement:

"W_k=\\dfrac{mv^2}{2};"

"W_k=\\dfrac {160kg\\sdot( 0.0006541m\/s)^2}{2}=0.0000342J;"

**Answer: **"W_k=0.00003442J."

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