1. A centrifuge rotor is accelerated for 25. s from 2000 rpm to 12000 rpm (revolutions per minute). (a) What is its average angular acceleration? (b) Through how many revolutions has the centrifuge rotor turned during its acceleration period, assuming constant angular acceleration?

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1. A centrifuge rotor is accelerated for 25. s from 2000 rpm to 12000 rpm (revolutions per minute).

(a) What is its average angular acceleration?

(b) Through how many revolutions has the centrifuge rotor turned during its acceleration period, assuming constant angular acceleration?

(a)  Need This to answer (b)

(b)  Answer  (2_S.F. Do not round till the end)

 

2.

A bicycle slows down uniformly from v0 = 8.89 m/s to rest over a distance of 124 m, Fig. 8–9. Each wheel and tire has an overall diameter of 50 cm.

Determine the time it took to stop.

 

3. A bicycle slows down uniformly from v0 = 7.56 m/s to rest over a distance of 100 m, Fig. 8–9. Each wheel and tire has an overall diameter of 61.4 cm.

Determine the time it took to stop

 

4.

If a 59.6 kg person jumps onto a seesaw at an angle of 24 degrees at a distance of 6.4 m from the fulcrum.
How much force will their friend feel if they are sitting 7.9 m on the opposite side of the seesaw?
 
 
5.
If a 44.3 kg person jumps onto a seesaw at an angle of 16 degrees at a distance of 5.4 m from the fulcrum.
How much force will their friend feel if they are sitting 7.8 m on the opposite side of the seesaw?
 
 
6.

(6a)Two weights on a bar: different axis, different I. Two small "weights," of mass 9 kg and 8.8 kg, are mounted 5.0 m apart on a light rod (whose mass can be ignored), as shown in Fig. 8–19. Calculate the moment of inertia of the system when rotated about an axis halfway between the weights, Fig. 8–19a.

(6b) Two weights on a bar: different axis, different I. Two small "weights," of mass 5.6 kg and 6.9 kg, are mounted 4.0 m apart on a light rod (whose mass can be ignored), as shown in Fig. 8–19. Calculate the moment of inertia of the system when rotated about an axis halfway between the weights, Fig. 8–19a.

(6c) Two weights on a bar: different axis, different I. Two small "weights," of mass 7.2 kg and 5.6 kg, are mounted 5.0 m apart on a light rod (whose mass can be ignored), as shown in Fig. 8–19. Calculate the moment of inertia of the system when rotated about an axis 1.83 m to the left of the 7.2-kg mass (Fig. 8–19b).

(6d)Two weights on a bar: different axis, different I. Two small "weights," of mass 8.5 kg and 8.5 kg, are mounted 8.0 m apart on a light rod (whose mass can be ignored), as shown in Fig. 8–19. Calculate the moment of inertia of the system when rotated about an axis 0.95 m to the left of the 8.5-kg mass (Fig. 8–19b).

 

7. A 22.4-N force is applied to a cord wrapped around a pulley of mass M = 4.03-kg and radius R = 21.9-cm The pulley accelerates uniformly from rest to an angular speed of 28.8 rad/s in 4.63-s. If there is a frictional torque  = 2.11-mN at the axle, (a) determine the moment of inertia of the pulley, (b) determine the rough estimate of the moment of inertia. (The pulley rotates about its center) What is the difference be (a) and (b)?

8. A 14.0-N force is applied to a cord wrapped around a pulley of mass M = 3.46-kg and radius R = 35.4-cm The pulley accelerates uniformly from rest to an angular speed of 30.4 rad/s in 2.57-s. If there is a frictional torque  = 1.02-mN at the axle,  (a) determine the moment of inertia of the pulley, (b) determine the rough estimate of the moment of inertia. (The pulley rotates about its center) What is the difference be (a) and (b)?

 

9. 5 identical  16.1-gram masses are 13.8-cm from an axis of rotation and rotating at 168-revolutions per minute.What is the moment of inertia of the 5-object system? (The strings holding the masses are of negligible mass)

 

10. 5 identical  16.1-gram masses are 13.8-cm from an axis of rotation and rotating at 113-revolutions per minute.What is the Rotational Kinetic Energy? (The strings holding the masses are of negligible mass)

 

11. 4 identical  25.2-gram masses are 14.2-cm from an axis of rotation and rotating at 144-revolutions per minute. What is the Rotational Kinetic Energy? (The strings holding the masses are of negligible mass)

 

12. What will be the speed of a solid sphere of mass 6.20-kg and radius 11.2-cm when it reaches the bottom of an incline if it starts from rest at a vertical height 13.7-m and rolls without slipping? 

 

(Im sorry for all the questions its the only way I can pass physics.)

 

 

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