An object's angular momentum changes by 10 kg-m^2/s in 2.0 s. What magnitude average torque acted on this object? * a. 5 Nm ОБ. 10 Nm О с. 20 Nm O d. 40 Nm ****A wheel of moment of inertia of 5.00 kg-m^2 starts from rest and accelerates under a constant torque of 3.00N-m for 8.00 s. What is the wheel's rotational kinetic energy at the end of 8.00 s? * а. 57.6 J O b. 78.8 J O c. 91.9 J O d. 122.0 J

4. 00 10 cm MA = 100 g m² = 100 g mc = 200 g mp = 200 g The four masses are connected by massless rigid sticks. a.) Locate the center of mass. b.) The object rotates about an axis that passes through the center of mass and is parallel to the z-axis. The constant angular velocity is w = 8 rad/s. Calculate the total kinetic energy of this system.

6. Find the angular momentum of Earth around the Sun. Also find the angular momentum of a rod about an axis passing through its edge. The length of the rod is 4 m and its mass is 500 g.

An ice skater, whose rotational inertia is I = 4 kg·m2 with her arms close to her body, is spinning at 2 rad/s. She then fully extends her arms, changing her rotational inertia to 8 kg·m2. Which of the following is true? a.) Her angular momentum remains the same. b.) Her angular velocity decreases.     c.) Her kinetic energy decreases. d.) All of the above. e.) B and C. d.) None of the above.

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 &

+, F. You use a wrench to turn a rusty nut. You place your hand at where the black dot is and apply a force F = 110N at an angle 0 = 59 degrees. The distance from your hand to the center of nut d = 30 cm. Calculate the torque in N. m your hand applies. %3D %3D %3D p. 0. MacBook Pro G Search or type URL

Q5

The angular speed of the hour hand of a clock, in rad/s, is: a. 1/30 π   b.  1/1800 π   c. 7200   d.  1800   e.  1/7200 π

Suppose a disk with constant angular velocity has rotational kinetic energy 1280 J. If the moment of inertia of the disk is 35 kg-m?, then what is its angular velocity? 8.552 rad/s 9.066 rad/s С. 7.303 rad/s 10.07 rad/s 10.40 rad/s А. D. В. E. 10.14 rad/s F.

A tennis player swings a standard tennis racket that is 27 inches long at an angular velocity of 20 rad/s. If the tennis player changes to a junior tennis racket that is 23 inches long and swings with an angular velocity of 20 rad/s, what happens to the linear velocity of the tennis racket? A. Linear velocity decreases B. Linear velocity remains the same C. Need more information