A 100-kg disc of radius 50 cm is rotating at 1200 rpm. What is its kinetic energy?
A 100-kg disc of radius 50 cm is rotating at 1200 rpm. What is its kinetic...
A disc-shaped merry-go-round has a mass of 100 kg and a radius of 1.60 m and is initially spinning at 20.0 rpm, with a 33-kg child sitting at its center. The child then walks out to the edge of the disc. (a) Find the initial and final moments of inertia of the system (disc + child), treating the child as a point particle. (b) State why the system’s angular momentum is conserved. (You can assume that the axis of the...
what is the grinding wheels kinetic energy when it is rotating at 1200 rev/min? a 1.5-kg grinding wheel is in the form of a solid cylinder of radius 0 10 m that rotates about an axis through its center..
A uniform solid cylinder of a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 33.4 rpm. What is its kinetic energy?
A disk of mass 1.0 kg and radius 25 cm is rotating about a fixed axis through its center at 8 rad/s. What is its kinetic energy? What is the angular momentum of the disk in question?
An automobile has a mass of 1200 kg. What is its kinetic energy, in kJ, relative to the road when traveling at a velocity of 50 km/h? If the vehicle accelerates to 100 km/h in 15 seconds, what is the change in power required?
6. A dc generator is being tested at a constant rotational speed of 1200 rpm While rotating at 1200 rpm, the voltage measured with no load attached (open circuit) was 90.0 V After attaching a heater drawing 100 A from the generator, the terminal voltage (at 1200 rpm) dropped to 84.0 V. Draw a Thevenin equivalent circuit model for the generator operating at 1200 rpm. 6. A dc generator is being tested at a constant rotational speed of 1200 rpm...
2. A wheel of radius 15 cm accelerates uniformly from 100. rpm to 300. rpm in 8.0 sec. If the wheel is rolling without slipping, how far does the wheel roll in the 8.0 seconds? What is the linear acceleration of the axle of the wheel. What is the total acceleration of the top of the wheel when the wheel is rotating at 100. rpm?
A solid disc of mass 16-kg and radius 50 cm has a mass of 4-kg hanging from one side by a massless string. The disc acts like a frictionless pulley and rotates freely about its center. Once released from rest, how much time does it take for the wheel to rotate through 20 revolutions? (A) 2 Squareroot 2 pi seconds (B) Squareroot 2 pi seconds (c) 2 Squareroot pi seconds) D) Squareroot pi/2 seconds
5. Disk A, of radius R1=10.0 cm and mass m1=5 kg is rotating about its axis at a rate of 42.0 rpm. It is brought in contact with another disk, B, of radius R2=15.0 cm and mass m2=6 kg at rest. Quickly, both disks start to rotate together at the same rate. Both disks rotate on their shafts on low friction bearings. a) What is the energy of the first disk before contact? b) What is the angular momentum of...
A uniform disc of radius 30 cm and mass 12 kg is pivoted so that it is free to rotate about an axis through its center. A string wrapped around the disc is pulled with a force of 80 N. What is the angular velocity of the disc after 5 s ?