Q1- A 1.2-kg disk with a rotational inertia given by MR2/2 is free to rotate on

Question

Q1- A 1.2-kg disk with a rotational inertia given by MR2/2 is free to rotate on a fixed horizontal axis suspended from the ceiling. A string is wrapped around the disk and a 0.80-kg mass hangs from the free end. If the string does not slip then as the mass falls and the cylinder rotates, what is the tension in the string? _________ N

Q2- A torque of 520 Nm acts on a flywheel. At the instant that the flywheel’s angular speed is 46 rad/s, at what rate is work being done by the torque?   

A : 126 W

B : 11 W   

C : 36 W

D : 2.4 x 104 W   

E : 3800 W

Explanation / Answer

Q2 :

Rate of work done = Torque x speed = 520 x 46 = 23920 =2.4 x 104 Watt

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.