10.3 Physics Help Please! Inertia?
An energy storage system based on a flywheel (a rotating disk) can store a maximum of 4.3 MJ when the flywheel is rotating at 1.8×104 revolutions per minute. What is the moment of inertia of the flywheel? Express answer in kg * m^2
I have a question about physics and inertia. Please help?
My professor had this question in class, and I can't understand why the answer is inertia, please explain this concept to me in simple terms, I am not too good in physics, thanks: If you have snow on your boots, you can get the snow off by stamping your boots on the floor. This is in accord with the law of: _______. (Answer: inertia)
Need help with a rotational inertia physics question!?
A bug of a known mass m stands at a distance d from the axis of a non-uniform spinning disk with radius r and unknown rotational inertia I that is rotating at fi revolutions per second. After the bug walks out to the edge of the disk and stands there, the disk rotates at ff revolutions per second. Determine the rotational inertia of the non-uniform disk. Express your answer in terms of the variables m, r, d, fi, and ff. Determine the change of kinetic energy in going from the initial to the final situation for the total bug-disk system. Express your answer in terms of π the variables m, r, d, fi, and ff.
Physics, moment of inertia question, please help?
There are 2 types of motion that add up for the total kinetic energy The rotational motion energy + the translational (moving) motion energy = KE 1/2*I*w^2 + 1/2 *m*V^2 = KE w is the rotational speed in radians per second, I is the mass moment of intertia for a disk, m is the mass of the disk, and V is the moving or translational velocity.
Rotational inertia physics question?
1. Assume that the Earth is a solid sphere or radius r and mass m. 2 Assume that the Earth is so far away from the Sun that it's radius r is very small in comparison to the radius of its orbit R and Earth becomes sort of a point mass. For a solid sphere I= (2/5)mr^2 For point mass I=mR^2 Ratio=(2/5)mr^2 / mR^2 Ratio=(2/5)(r / R)^2
Physics question using inertia and angular speed, please help!?
A solid metal sphere of diameter D is spinning in a gravity-free region of space with an angular velocity of ω. The sphere is slowly heated until it reaches its melting temperature, at which point it flattens into a uniform disk of thickness D/2. By what factor is the angular velocity changed? I know you need to use the radius and thickness to calculate the moment of inertia and that the rate of rotation must change to conserve the angular momentum but I'm not exactly sure how?
On the AP physics 1 exam, do we have to know rotational inertia (like to what depth, and do we have to memorize the formulas)?
I am glad you included the phrase “like to what depth”. Here are some answers to your question:No need to ever memorize any formulas. UNDERSTAND the formulas and what they represent. The formulas would be provided to you in the exam. But I think they would be useless if you do NOT UNDERSTAND what they represent. Ask your teacher to hand out a copy of the formula sheet that is a standard handout during the exam. But once again, to take full benefit from the formulas, UNDERSTAND what they mean.The answer to your question is YES & NO. Yes, you need to know rotational inertia. You need to know what it means and how it compares to inertia of rest and inertia of linear motion. [They all represent the same thing: the property of matter that changes acceleration proportionally. In the case of rotation, the acceleration is angular.] You need to know the ANALOGOUS nature of angular displacement (theta), angular velocity (omega) and angular acceleration (alpha) to their linear counterparts of displacement, velocity and acceleration respectively. You also need to know that the kinematic equations are similar except we substitute the above quantities in the equations. You also need to know that MASS is ANALOGOUS to Moment of Inertia (I) but you do not need to derive the expressions that evaluate (I). True evaluations require calculus and AP Physics-1 is algebra-based.Please be aware that there would be at least one question (sometimes up to four), in the multiple choice section of the exam on Rotational Motion. The formula sheet is not available to you during the multiple choice part. But rest assured that the questions can be answered correctly if you have a good understanding of the basic principles in rotational motion.You need to know the analogy of Net Force to Net Torque: the former causes linear acceleration, the latter causes angular acceleration.Personal Hint: if the object is an odd-shaped mass, such as rectangular and standing on its ‘width’, and if a force is applied but NOT directed to its center of mass, then expect the answer to include some form of rotation.I wish you an open mind and clear thinking in your upcoming challenge of sitting for the AP Physics Exam!
Calculate the moment of inertia for this physics problem?
I am stuck on this problem and need help. Thanks The four particles shown below are connected by rigid rods of negligible mass where y = 6.60 m. The origin is at the center of the rectangle (a) If the system rotates in the xy plane about the z axis with an angular speed of 5.90 rad/s, calculate the moment of inertia of the system about the z axis. Answer in kg·m^2 (b) Calculate the rotational energy of the system. Answer in J link to figure: http://www.webassign.net/pse/p10-25alt.g...
What is moment of inertia?
Moment of inertia is the property of a body to resist the angular acceleration due to external torque.For better understanding the concept of moment of inertia,you must have a good conceptual hold on linear kinetics.Linear kinetics Ian's hugely based on Newton's laws of motion.Newton's 1 st law of motion states that if a body is at rest or is moving,continues to do so without any change unless an external force us applied.From this we notice that every body has some tendency to remain in its state of motion or rest.This property is known as inertia.Roughly inertia of a body is determined by its mass. As from our daily experience we know that it is difficult to move a heavy object but it is not so difficult when the object is lighter in mass.This we are quite familiar with property of inertia of a body.Now ,after understanding the concept of inertia,which is governed by mass of the body,it is easy to derive an analogous situation in case of angular motion.We have angular velocity ,angular acceleration,torque in angular motion which are analogous to velocity,acceleration,force in case of linear motion.In linear motion,we have the formula,F=m X aWhere,F is force appliedm is the mass of the object and,a is the acceleration.Similarly in case of angular motion we have the formula,T=I x a’where,T is torqueI is moment of inertia and,a’ is angular acceleration.Thus we see that moment of inertia is tendency to resist angular motion which is done by mass in case of linear motion.Remember moment of inertia is not mass of an object but analogous to mass.I think you have understood what is moment of inertia.Read some books to have a deeper concept.If you liked the answer please upvote it.Goodbye.