A solid disk is mounted on a contraption with a spinning axis. Take another solid disk and place it on top and in the center of the contraption with the metal hoop. We make sure to apply the same torque to both contraptions. Which contraption spins faster and why? Explain this to me please. The concept is in the image below.

a meterstick is balanced at the 60.0 cm mark on a fulcrum. A 63.0 gram object is hung from the 10.0 cm mark and a 150 gram object is hung from the 95.0 cm mark. IF the meterstick is in balance and horizontal, what is the mass of the meterstick? What is the total counter-clockwise torque? WHat is the clockwize torque?

A typical small rescue helicopter has four blades: Each is 4.00 m long and has a mass of 50.0 kg. The blades can be approximated as thin rods that rotate about one end of an axis perpendicular to their length (I = (Ml^2)/3). The helicopter has a total loaded mass of 1000 kg.  a.) Calculate the rotational kinetic energy in the blades when they rotate at 300 rpm.  b.) Calculate the angular momentum of the four combined blades when they rotate at 300 rpm (Hint: Find the angular momentum for one blade and multiply it by 4).

The platform shown in the figure below (The Merry-Go-Round) has a mass of M- 100 kg and radius R 2.0 m. Lia (m 30 kg) walks slowly from the rim of the disk toward its center. If the angular speed of the system is 2.0 rad/s when Lia is at the rim, what is the angular speed when she reaches a pointr 3- 0.5 m from the center? M

You stand on a turn-table with arms extended out horizontally, as shown in the figure below. In each hand, she holds an 8 kg weight. In this initial state, your professor and the turn-table are rotating at a constant rate of 9 rpm. Note that each weight is held 85 cm from the axis of rotation. Your professor brings her arms, and the weights, inwards towards her axis of rotation, as shown in the figure. What is the final rotational speed, in rpm, of your professor on the turn- table? You can assume that the weights are located on the axis of rotation in this final state. Wi Wt inital rinal State stüte The turn-table has a moment of inertia of 0.31 kg m^2. Your mated as a solid cylinder of uniform density with a mass of 65 kg and a radius of 16 cm. You can neglect the mass of the arms. assume that the weights can be approximated as point masses. body can be approxi-

A turn table starts from rest and reaches 11 rad/s of angular velocity in 9.0 s. Find the total angle it turned during the time in rad. Hint: use rotational kinematics formula. Assume initial angle and initial angular velocity as zero.   Your Answer:

Computation. Mounted for repair, a 3.4-kg bicycle tire has a radius of 32 cm. It rotates through an angle of 23.9 rad as it slows uniformly from 28.9 rad/s to 17.7 rad/s. Find the magnitude of its angular acceleration. a = rad/s² Record your numerical answer below, assuming three significant figures. Remember to include a "_" as necessary. O Search C &

Joseph, Winston, and Franklin are doing an experiment in lab that involves rotational dynamics. Using the apparatus below, Joseph places a disk with a mass of 379 g on the apparatus. Winston then hangs a 15 g mass from the pulley and releases it. The 15 g mass drops and then rises back up, then drops again. They each graph the angular velocity ω as a function of time as the hanging weight drops, rises, and drops again. Their graphs are shown below. Only one is correct. Identify the correct graph and explain why it is correct. For the incorrect graphs, explain why they are not correct.

A frictionless pulley has the shape of a uniform solid disk of mass 2.90 kg and radius 10 cm. A 1.30 kg stone is attached to a very light wire that is wrapped around the rim of the pulley (the figure (Figure 1)), and the system is released from rest. How far must the stone fall so that the pulley has 3.40 J  of kinetic energy? What percent of the total kinetic energy does the pulley have?

In the image you see a sphere rolling down an inclined plane. Rolling without slipping. Is the weight (mg) producing any torque? Select the correct answer. mg O No O Yes 1P