Light Rotating Ball A small 1.25 kg ball on the end of a light rod is rotated in a horizontal circle of radius 0.630 m....?
A small 1.25 kg ball on the end of a light rod is rotated in a horizontal circle of radius 0.630 m.
(a) Calculate the moment of inertia of the system about the axis of rotation.
(b) Calculate the torque needed to keep the ball rotating at constant angular velocity if air resistance exerts a force of 0.0800 N on the ball.
(a) Moment of Inertia, I = 1.25x0.630^2 = 0.496 kg m^2
(b) Resistive torque = 0.08x0.630 = 0.05 N m = applied torque as angular velocity or angular momentum is constant.
Gyro Energy Sphere UFO Sedona Arizona July 19 2009 11:00 pm
Rotator Cuff Exercises For Impingement, Frozen Shoulder, Tears And Rehabilitation
There are many shoulder conditions that can be cured with specific rotator cuff exercises. Shoulder Tendonitis and/or Bursitis, Impingement Syndrome and Frozen Shoulder, to name the most common. Also injuries arising from accidents and falls, such as rotator cuff tears and dislocated shoulders. All of these can be cured successfully with specific exercises for rotator cuff.
Many aspects can can go wrong with the complex yet delicate set up of a shoulder, from wear and tear to inflammation and pain, from scars (adhesions) to tears. Whenever a person finds him/herself affected by a rotator cuff condition, he/she may be in for a long journey to recovery. Whatever the condition, it always starts with pain on the side that later may extend down to the elbow or even the neck and the back, depending on gravity. Having suffered myself from a Frozen Shoulder, I know first hand how disabling it is to live with pain and limited range of motion. The worst aspect of any shoulder condition is that it usually takes a long time to heal naturally.
The rotator cuff is made up of 4 different muscles called, Supraspinatus, Infraspinatus, Teres Minor and Subscapularis. These attach themselves to different parts of the shoulder blade, the scapula, and converge into the top of the arm bone, the Humerus. They surround the joint keeping the arm ball into its socket, the Glenoid, working together in synchronizing fashion. Unfortunately this complex set up is also prone to conditions and wear and tear. This is the catch nature gave us to pay for the most flexible of all joints of the human body.
Due to the shallow nature of the shoulder joint, the arm can perform a range of motions unmatched by any other joint and it is easy to forget about its flexibility until something goes wrong. The usual protocol for rotator cuff treatment is the prescription of anti inflammatory drugs such as aspirin or ibuprofen, prescription drugs, cortisone injections and even surgery or manipulation.
However, a properly set up program of rotator cuff exercises can and will reduce recovery times to a fraction, freeing the sufferer from drug dependency. It is common for conditions such as Frozen Shoulder, Impingement, Bursitis, or Tendonitis to take months and even years to resolve, while this could be avoided by implementing specific exercises for the rotator cuff. Unlike general shoulder exercises performed in the gym like military presses, these movements are specifically targeted at the rotator cuff, not the Deltoid or the Trapezius. They mainly consist of external and internal rotational exercises to help strengthen the cuff muscles and tendons.
Likewise, a rehabilitation program following a tear or surgery greatly benefit from the same protocol, providing a period of rest is first assigned in order to allow the tendons to heal before exertion. During this phase, called passive phase, only a physical therapist can perform the exercises by moving the patient arm. Once the tendons are sufficiently strong, an active phase can be started without any resistance but the arm natural weight. Upon further strengthening, light resistance can be applied to reinforce muscles and tendons to full flexibility and functionality.
6 or 7 main rotator cuff exercises are all that is needed to target the cuff from all angles, reducing inflammation and providing foundation for the cuff strength and fitness. Even when the shoulder is healed and healthy, these exercises should be performed as part of training routines to keep them strong and capable to assist and withstand all other shoulder exercises and movements played in sports or performed in the gym.
Rotator cuff exercises should be performed regularly for best results. Consistency is the key to a successful rehabilitation program, while poorly executed exercises can on the contrary increase healing times. It is best to avoid throwing movements and over head presses such as military presses or bench presses before the rotator cuff has improved, because they can irritate muscles and tendons even more.
Many other exercises can be performed, provided that they are designed by a specialist in physical therapy with knowledge in the field and experience in rotator cuff therapy. Since it takes many months for a shoulder to recover spontaneously, it is not a good idea to implement exercises taken randomly here and there, because they could lead to further injury and strain. A visit to a doctor should always be arranged to have a professional diagnose about your specific condition before you start a rehabilitation program.
About the Author
Simple rotational rotator cuff exercises by a professional therapist can help you cut down on recovery times to few weeks, rather than waiting in misery and pain for months to see any improvement, if at all.
If you are affected by any of the above shoulder conditions, please check this rotator cuff exercises program. It could save you months of pain and discomfort, as I discovered to my relief.
Can't really tell you exactly where you would fit in without seeing you bowl, but it sounds like you might be more of a stroker than anything else…. possibly a tweener, but it sounds more like a stroker to me.
As for the way you're throwing it, the fact that your hand "finishes" around the outside of the ball, is actually how most bowlers bowl, and its how to generate revs on the ball. As for the whole "no thumb" thing, I don't know who would really reccomend that, certainly not anyone experienced in bowling, as it's VERY hard to control. You'll put a ton of revs on the ball, and likely get a big hook, but its very sporadic and very hard to control.
From what it sounds like, you're on the right track, and you've actually figured out a good style all on your own. I would suggest getting your own ball. 10 or 12 lbs aren't going to cut it though. Not only is there way too much deflection to really get a lot of strikes, but a lot of the good balls are only made in 14+. If you're going to start out, I'd pick a cheaper reactive ball to start out with, a medium performance ball, maybe even a used ball thats been plugged and drilled to save some money. Get it drilled fingertip, as thats going to allow you to control it the best and give you the best ball reaction (really hard to hook a conventional) and if you're trying to gradually build up, go with a 14. Some pros have even tried 14, and since some balls are so strong, you don't NEED to use a 16 for maximum pin action. I've been at 15 for a long time.
Its great to hear about someone who loves bowling, as its a great sport. Your best bet overall would be to go into your local pro shop and tell him what you want and have him suggest a ball for you. You can even ask him to watch you bowl so he can see what style you will fit into, but like I said, you sound like a stroker. One word of caution…. if you're using a plastic house ball now and then buy your own ball and try it out, be prepared for a huge difference. Don't get discouraged if you throw a ball and it hooks off the lane or doesn't go where you want. It takes a little getting used to, but a new reactive or particle ball with a fingertip grip will be far easier to control and be far more predictable. If theres ever any questions you have, would love to help.
Can't really tell you exactly where you would fit in without seeing you bowl, but it sounds like you might be more of a stroker than anything else…. possibly a tweener, but it sounds more like a stroker to me.
As for the way you're throwing it, the fact that your hand "finishes" around the outside of the ball, is actually how most bowlers bowl, and its how to generate revs on the ball. As for the whole "no thumb" thing, I don't know who would really reccomend that, certainly not anyone experienced in bowling, as it's VERY hard to control. You'll put a ton of revs on the ball, and likely get a big hook, but its very sporadic and very hard to control.
From what it sounds like, you're on the right track, and you've actually figured out a good style all on your own. I would suggest getting your own ball. 10 or 12 lbs aren't going to cut it though. Not only is there way too much deflection to really get a lot of strikes, but a lot of the good balls are only made in 14+. If you're going to start out, I'd pick a cheaper reactive ball to start out with, a medium performance ball, maybe even a used ball thats been plugged and drilled to save some money. Get it drilled fingertip, as thats going to allow you to control it the best and give you the best ball reaction (really hard to hook a conventional) and if you're trying to gradually build up, go with a 14. Some pros have even tried 14, and since some balls are so strong, you don't NEED to use a 16 for maximum pin action. I've been at 15 for a long time.
Its great to hear about someone who loves bowling, as its a great sport. Your best bet overall would be to go into your local pro shop and tell him what you want and have him suggest a ball for you. You can even ask him to watch you bowl so he can see what style you will fit into, but like I said, you sound like a stroker. One word of caution…. if you're using a plastic house ball now and then buy your own ball and try it out, be prepared for a huge difference. Don't get discouraged if you throw a ball and it hooks off the lane or doesn't go where you want. It takes a little getting used to, but a new reactive or particle ball with a fingertip grip will be far easier to control and be far more predictable. If theres ever any questions you have, would love to help.