The Moment of Inertia of Flywheel Physics Questions Essay Example For Students

The Moment of Inertia of Flywheel: Physics Questions Essay The flywheel of an engine has moment of inertia 2. 5 kg†¢m2 about its rotation axis. What constant torque is required to bring it up to an angular speed of 400 rev/min in 8s, starting from at rest? A solid, uniform cylinder with mass 8. 25kg and diameter 15cm is spinning at 200 rpm on a thin, frictionless axle that stop the cylinder axis. You design a simple friction brake to stop the cylinder by pressing the brake against the outer rim with a normal force. We will write a custom essay on The Moment of Inertia of Flywheel: Physics Questions specifically for you for only $16.38 $13.9/page Order now The coefficient of kinetic friction between the brake and rim is 0. 333.What must be the applied normal force to bring the cylinder to rest after it has turned through 5. 25 rev? A 2. 2kg hoop 1. 2m in diameter is rolling to the right without slipping on a horizontal floor at a steady 3 rad/s. (a) how fast is its center moving? (b) What is the total kinetic energy of the hip? (c) Find the velocity vector of each of the following points as viewed by a person at rest on the ground: i) the highest point on the hoop; ii) the lowest point on the hoop; iii) the point on the right side of the hoop, midway between the hoop and the bottom. d) Find the velocity vector for each points in part c, except as viewed by someone moving along with same velocity as the hoop. A solid ball is released from res and slides down a hillside that slopes downward at 65 ° from the horizontal. (a) What minimum value must the coefficient of static friction between the hill and ball surfaces have for no slipping to occur? (b) Would the coefficient of friction calculated in part a changed if the mass were doubled to 4kg? pic] A 392N wheel comes off a moving truck and rolls without slipping along a highway. At the bottom of a hill it is rotating at 25 rad/s. The radius of the wheel is 0. 6m, and its moment of inertia about its axis is 0. 8MR2. Friction does work on the wheel as it rolls up the hill to a stop, a height h above the bottom of the hill; this work has absolute value 3500J. Calculate h. A playground merry-go-round has radius 2. 4m and moment of inertia 2100 kg†¢m2 about a vertical axle through its center, and it turns with negligible friction. a) A child applies 18N force tangentially to the edge of the merry-go-round for 15s. If the merry-go-round is initially at rest, what is its angular speed after this 15s interval? (b) How much work did the child do on the merry-go-round? (c) What s the average power supplied by the child? A 1. 5 kg grinding wheel is in the form of a solid cylinder of radius 0. 1m. (a) What constant torque will bring it from rest to an angular speed of 1200 rev/min in 2. 5s? (b) Through what angle has it turned during that time? c) Calculate the work done by the torque. (d) What is the grinding wheel’s kinetic energy when it is rotating at 1200 rev/min? Compare your answer in part c. (a) Compute the torque developed by an industrial motor whose output is 150kW at an angular speed of 4000rev/min. (b) A drum with negligible mass, 0. 4m in diameter, is attached to the motor shaft, and the power output of the motor is used to raise a weight hanging from a rope wrapped around the drum. How heavy a weight can the motor lift at constant speed? c) At what constant speed will the weight raise? The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod providing about an axis through its center. His hands and arms can be combined mass 08kg. When outstretched, they span 1. 8m; when wrapped they form a cylinder of radius 25cm. .u6a702cab01b9fd33a271db54e70f33e4 , .u6a702cab01b9fd33a271db54e70f33e4 .postImageUrl , .u6a702cab01b9fd33a271db54e70f33e4 .centered-text-area { min-height: 80px; position: relative; } .u6a702cab01b9fd33a271db54e70f33e4 , .u6a702cab01b9fd33a271db54e70f33e4:hover , .u6a702cab01b9fd33a271db54e70f33e4:visited , .u6a702cab01b9fd33a271db54e70f33e4:active { border:0!important; } .u6a702cab01b9fd33a271db54e70f33e4 .clearfix:after { content: ""; display: table; clear: both; } .u6a702cab01b9fd33a271db54e70f33e4 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u6a702cab01b9fd33a271db54e70f33e4:active , .u6a702cab01b9fd33a271db54e70f33e4:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u6a702cab01b9fd33a271db54e70f33e4 .centered-text-area { width: 100%; position: relative ; } .u6a702cab01b9fd33a271db54e70f33e4 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u6a702cab01b9fd33a271db54e70f33e4 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u6a702cab01b9fd33a271db54e70f33e4 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u6a702cab01b9fd33a271db54e70f33e4:hover .ctaButton { background-color: #34495E!important; } .u6a702cab01b9fd33a271db54e70f33e4 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u6a702cab01b9fd33a271db54e70f33e4 .u6a702cab01b9fd33a271db54e70f33e4-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u6a702cab01b9fd33a271db54e70f33e4:after { content: ""; display: block; clear: both; } READ: Saint John Bosco Essay Research Paper The movement of inertia about the rotation of axis of the remainder of his body is constant and equal to 0. 40kg†¢m2. If his original angular speed is 0. 4 rev/s, what is his final angular speed? pic] A large wooden turntable in the shape of a flat uniform disk has a radius of 2m and a total mass of 120kg. The turntable is initially rotating at 3 rad/s about a vertical axis through its center. Suddenly, a 70 kg parachutist makes a soft landing on the turntable at a point near the outer edge. (a) Find the angular speed of the turntable after the parachutist as a particle. (b) Compute the kinetic energy of the system before and after the parachutist lands. Why these kinetic energies are not equal?

Informative Essay Sample on Go Ask Alice by Grace Slick

Informative Essay Sample on Go Ask Alice by Grace Slick In the book Go Ask Alice , by Grace Slick, the main character Alice had suffered in a way that forced her to escape from her home to avoid her family. She was in too much trouble. She was on drugs and her parents did not know anything but they had a notion that she was hiding a secret from them. In the book, Alice was into drugs and was trying to stop using drugs when she was 14 and 15 years old. On the day that she want to a party she was raped. The day she first tried marajuana at a party there was also drugs in her drink and she did not know until the next day when her best friend told her what happened. She kept the secret and she never told her parents that she had tried drugs. Before Alice ran away from home she was wondering what it would be like to smoke a joint. After that she began to like it and she began become addicted to drugs. That was the time her parents noticed there was something going on with Alice Anonymous. Alices best friend helped her and got her things that she needed. For example she helped her get a job, a house and things that would make her stop thinking about drugs and stop her from using drugs. In the end, Alice came back home clean and didnt have any more trouble with drugs. Alice and her mother began to solve all the problems she had been through and they made a promise to each other that if she has any problems, they would talk about them. The part I disliked about the book was when she was raped and what people made her go through. People kept telling her to try the drugs and when she went to school people tried to sell it to her. Some of the other kids using drugs tried to blame everything on Alice to get her in trouble so she would get kicked out of school. The part that hurt is when she couldnt tell her mother how school was when she would come home from school crying and suffering. I am interested in this book because it showed me what my family went through when they were teenagers and other people I know too who had trouble using drugs. The book also made me experience a lot of feelings like sadness, happiness, excitement, etc. I like this book because it explained what a person had been through and where they went when they needed to run away from their problems. I also read this book because when my aunt was a teenager she read this book and I was wondering what kind of book she was reading when she was young. This book is interesting because it shows people and teenagers what it is like to be addicted to drugs and to help them understand what they might be going through if they start up on drugs. I found this book a good example of someone suffering and having a hard time trying to solve a problem by themself when they dont want to tell their parents or family members. You can order a custom essay, term paper, research paper, thesis or dissertation on Go Ask Alice topics at our professional custom essay writing service which provides students with custom papers written by highly qualified academic writers. High quality and no plagiarism guarantee! Get professional essay writing help at an affordable cost.