A woman of mass 61kg sits on the left end of a see-saw of length 4m, pivoted in the middle. Where should a man of mass 75kg sit if the system is to be balance? (Find the position with respect to the right end of the board)

Amachine part has the shape of solid cylinder aof mass 500 g, diameter of 4.00 cm and length of 10,0 cm. It is spinning about a frictionless axle through its coaxial center, but its rim is scraping against metal, resulting in a friction force of 0.0375 N at that point. The moment of inertia of a solid cylinder rotating about its coaxial center is 1= mr?. If it takes the solid cylinder 3.00 s to %3D decrease its angular speed to 7.5 rad/s, what was the initial radial acceleration of the cylinder at a point on its rim? Select one: 1.125 m/s 10.1 m/s 18.0 m/s 4.50 m/s

A bicycle wheel can be thought of a uniform hoop with a radius of 48 cm and mass 1.6 kg. Consider the case where the wheel start from rest and accelerates uniformly under the action of a constantly applied torque of 0.5 N-m exerted by a force at the edge of the wheel. The torque is caused by the bicycle chain acting at a radius of 11.5 cm from the center of the wheel. (a) How long does the wheel take to reach a speed of 10 rev/min? (b) Through how many revolutions does it turn while accelerating? Your Answer: Answer

The moment of inertia of a square lamina about the perpendicular axis through its centre of mass is 20 kg per metre square then its moment of inertia about an axis touching its side and in the plane of the lamina will be?

Calculate the rotational inertia of a meter stick, with mass 0.651 kg, about an axis perpendicular to the stick and located at the 43.2 cm mark. (Treat the stick as a thin rod.)           Number:   Units:

A meter stick is placed on a pivot at the 40cm mark.  A mass of 0.25kg is placed on the 20cm mark to bring the system into static equilibrium.  What is the mass of the meter stick?

A schoolyard teeter-totter with a totallength of 6.4 m and a mass of 41 kg is pivoted at its center. A 21-kgchild sits on one end of the teeter-totter. (a) Where should a parentpush vertically downward with a force of 210 N in order to hold theteeter-totter level? (b) Where should the parent push with a force of310 N? (c) How would your answers to parts (a) and (b) change if themass of the teeter-totter were doubled? Explain

A solid cylinder with a mass of 15 kg and a radius of 5 cm is mounted on a frictionless horizontal axle over a well as shown in the Figure below. A rope of negligible mass is wrapped around the cylinder and supports a bucket with a mass of 3 kg. Find the bucket’s acceleration as it falls down the well shaft.

To develop muscle tone, a woman lifts a 2.00-kg weight held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. (a) What is the angular acceleration if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.250 kg and the net force she exerts is 750 N at an effective perpendicular lever arm of 2.00 cm? (b) How much work does she do? m²

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