The rotor (flywheel) of a toy gyroscope has mass 0.150 kg. its moment of inertia about its axis is 1.20 × 10−4kg2. the mass of the frame is 2.70 × 10−2kg. the gyroscope is supported on a single pivot (fig. 1) with its center of mass a horizontal 5 distance of 4.00 cm from the pivot. the gyroscope is precessing in a horizontal plane at the rate of one revolution in 2.30 s.
(a) find the upward force exerted by the pivot.
(b) find the angular speed with which the rotor is spinning about its axis, expressed in rev/min.

the answer to this question is 60 n

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.