Answer:
The rotation speed, w, is 2*pi radians/60 seconds = 0.105 rad/s and r = 0.01 m
The flea needs centripetal force given by
Fc = m*w^2/r
That force must come from friction given by
Ff = mu*N = mu*m*g
So
m*w^2/r = mu*m*g
Substitute the data, cancel the m's, and solve for mu.
When we're working problems that involve a pendulum, we almost always IGNORE anything else besides gravity.
Anything else besides gravity that could influence the motion of a pendulum is something that we would eliminate if we could.
Those are air resistance, mass of the string, friction at the top suspension point, and the Coriolis force, due to the Earth's rotation, that tries to change the plane of the pendulum's swing.
This question is probably fishing for the answer "<em>friction</em>".
At a definite point, the bridge would begin oscillating to the matching rhythm as that
of the marching footsteps.
This oscillation would touch a determined peak when the bridge can
no longer tolerate its own
power and later collapses. So, soldiers are
systematic to break their steps
while passing a bridge.
Answer:
I am going to say A
Explanation:
solids are normally close and tightly packed molecules and while ice is in solid form,so is it.
Let me know if i was right! Hope this helps! :)
