Rotational Kinetic Energy: A disk and a hoop of the same mass and radius are released at the same time at the top of an inclined plane. If both are uniform, which one reaches the bottom of the incline first if there is no slipping? O The hoop O The disk O Both reach the bottom at the same time. Submit Request Apwor
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I feel like the hoop would reach the bottom faster because less energy is required to move it. is this correct? thank you!
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- Save & Exit Check my In the construction of railroads, curvature of the track is measured in the following way. First a 100.0-ft-long chord is measured. Then the curvature is reported as the angle subtended by two radii at the endpoints of the chord. (The angle is measured by determining the angle between two tangents 100.0 ft apart; since each tangent is perpendicular to a radius, the angles are the same.) In modern railroad construction, track curvature is kept below 1.40°. What is the radius of curvature of a "1.40° curve"? 100 ft ft < Prev 10 of 36 Next MacBookA disk of 1‐kg mass and 0.2‐m diameter has a 30 revolutions per minute angular speed in the air when itis lowered and then touches a flat ground with 0.1 static and 0.07 kinetic friction coefficients. Determinethe time it takes for the disk to cover a 100 m distance. Please make sure to give a brief explanation for each step.A 10g mass is placed an the edge of 45rpm vinyl record and the record has a 9cm radius. The record is carefully placed on the turntable and switched on. What is the centrifugal force felt by the mass?
- A disk of 1‐kg mass and 0.2‐m diameter has a 30 revolutions per minute angular speed in the air when itis lowered and then touches a flat ground with 0.1 static and 0.07 kinetic friction coefficients. Determinethe time it takes for the disk to cover a 100 m distance. (please give an explanation for each step)At the local discotheque the speed dial controlling the 5 kg solid and uniform disco ball of radius 20 cm malfunctioned causing the disco ball to accelerate from 8 revolutions per minute up to 62 revolutions per minute. Calculate the change in kinetic energy. Answer in J.(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 56 kg CG N 0.86 m 1.44 m W reaction (b) How much work (in J) does she do if her center of mass rises 0.200 m? (c) What is her useful power output (in W) if she does 18 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) W
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- Determine the kinetic energy of a circular disc of mass of 5 kg and radius 2 m, rotating with a speed of 80 r.p.m. about an passing through circumference and perpendicular to its plane. axis point its a on(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 68 kg CG 0.85 m 1.42 m W F reaction (b) How much work (in J) does she do if her center of mass rises 0.260 m? (c) What is her useful power output (in W) if she does 21 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) WIf you now assume that its descent starts from rest, its speed at the lowest point of the curve is v2 = 5 m / s, its mass and that of the bicycle is approximately 71 kg and finally the radius is 5 m. Calculate the work done by the friction force between the tires and the pavement for the case when the friction force is considered.