Revolutions of and Electric Drill

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SUMMARY

The discussion focuses on calculating the angular displacement of a variable speed electric drill motor that accelerates from 100 rev/s to 210 rev/s at a rate of 53.0 rev/s². The correct approach involves using the rotational analogue of the kinematic equation Vf² = Vi² + 2ax, where Vf is the final angular velocity, Vi is the initial angular velocity, and a is the angular acceleration. The calculation yields an angular displacement of 15,700 revolutions, which was initially miscalculated. The correct methodology confirms the importance of applying the appropriate rotational equations for accurate results.

PREREQUISITES
  • Understanding of angular velocity and acceleration
  • Familiarity with kinematic equations in rotational motion
  • Basic knowledge of calculus for solving equations
  • Ability to perform unit conversions in rotational dynamics
NEXT STEPS
  • Study the derivation and application of the kinematic equations for rotational motion
  • Learn about angular displacement and its calculation in various contexts
  • Explore the relationship between linear and angular motion
  • Investigate practical applications of electric drill motors in engineering
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This discussion is beneficial for physics students, mechanical engineers, and anyone interested in understanding the principles of rotational dynamics and their applications in electric motor technology.

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1. A variable speed electric drill motor turning at 100 rev/s is uniformly accelerated at 53.0 rev/s2 up to 210 rev/s. How many turns does it make in the process?



2. (Accel f - Accel) i x speed



3. I took 210 - 53 = 157 and multiplied that by 100 and that gave me 15,700 rev. This anser is incorrect. Please advise.
 
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Data we have: Initial angular velocity, acceleration, final angular velocity. We want angular displacement.

This problem is the rotational analogue of one we would use the for the equation Vf^2 = Vi^2 + 2ax.

Replace V with angular velocity, a with acceleration and solve for x. Since we are working in units of rev, no division by 2*pi will be necessary - the answer your calculator gives you will be the answer you want.
 
I got it! Thanks so much for your help.
 

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