Work or energy spent=force times distance=25N*4m=100Nm
power=energy or work divided by time=100Nm/5s=20Nm/s
Answer:
New angular speed changes from 16 rpm to 19.95 rpm
Explanation:
In the given system the angular momentum of the system is conserved
initial angular momentum of the system
When 28 kg child moves to the center the moment of inertia changes thus we have
Equating initial and final angular momentum we get
Every atom with 15 protons in its nucleus
is an atom of Phosphorus.