Homework Statement
A car is designed to get its energy from a ro-
tating flywheel with a radius of 2.19 m and
a mass of 679 kg. Before a trip, the fly-
wheel is attached to an electric motor, which
brings the flywheel’s rotational speed up to
7310 rev/min.
Find the kinetic energy...
Homework Statement
An electric motor can accelerate a Ferris
wheel of moment of inertia 11300 kg · m2 from
rest to 9.6 rev/min in 14.6 s. When the mo-
tor is turned off, friction causes the wheel to
slow down from 9.6 rev/min to 8.37 rev/min
in 7.23 s.
Determine the torque generated by the mo-...
I figured it out! Thank you so much!
1/2mvi2= 1/2kd2 + Ffrd
0 = 1/2kd2 + Ffrd - 1/2mvi2
solve with quadratic ...
(I was getting stumped on that sign for the frictional force... I think that's what you were hinting at and I just wasn't putting 2 and 2 together!)
Homework Statement
A 5 kg mass slides to the right on a surface having a coefficient of friction 0.48. The mass has a speed of 7 m/s when contact is made with a spring that has a spring constant 138 N/m. The mass comes to rest after the spring has been compressed a distance d. The mass is then...