COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 3, Problem 76QAP
To determine
The factor by which the rotation speed of a centrifuge must increase, so that the acceleration increases by a factor 8.
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I am trying to find the distance from the point of rotation (y-axis) dm I have no idea how to do this or even get started
Question A6
A car is initially travelling with a speed of 32 m-s¹ when it slows down with a constant accelera-
tion of magnitude 2.1 m-s-2.
If the tyres of the car have a radius of 35.0 cm, calculate the number of revolutions that each tyre
makes before the car comes to a stop. Assume that the car does not skid.
ANDALUSIN STE
Problem 8
A carnival ride spins people in a circle to make them feel a centripetale
acceleration of 20 m/s². It spins the people around the circle at a speed
of 10 m/s. What must be the radius of the circle the people are spun
through? Don't forget units!
Chapter 3 Solutions
COLLEGE PHYSICS
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- A door in a hospital has a pneumatic closer that pulls the door shut such that the doorknob moves with constant speed over most of its path. In this part of its motion, (a) does the doorknob experience a centripetal acceleration? (b) Does it experience a tangential acceleration?arrow_forwardAn office door is given a sharp push and swings open against a pneumatic device that slows the door down and then reverses its motion. At the moment the door is open the widest, (a) does the doorknob have a centripetal acceleration? (b) Does it have a tangential acceleration?arrow_forwardQ5) A point P moves at a constant speed v in a counterclockwise direction along a circle of radius a as shown below. Selecting a pole O at the left end of the horizontal diameter, derive expressions for the radial a, and transverse de components of the acceleration (r = 2a cos0.) v constantarrow_forward
- A Ferris wheel with a radius of 9.1 m rotates at a constant rate, completing one revolution every 38 s. Suppose the Ferris wheel begins to decelerate at the rate of 0.21 rad/s2 when the passengers at the top of the wheel. A) Find the magnitude of the passenger's acceleration at that time. B) Find the direction of the passenger's acceleration at that time.arrow_forwardProblem 2 - Uniform Circular Motion A person of mass m = 68 kg is at the highest point above the ground on a rotating Ferris wheel. The normal force acting on the person at that point is ng = 555 N. a) What is the value of the centripetal acceleration a? b) What is the normal force acting on the person when she is at the lowest point on the rotating Ferris wheel? c) If the Ferris wheel doubles its angular velocity, what is the normal force acting on the person when she is at the highest point on the Ferris wheel?arrow_forwardChapter 5 Problem 8: BIO Ultracentrifuge You are working in a biology lab and learning to use a new ultracentrifuge for blood tests. The specifications for the centrifuge say that a red blood cell rotating in the ultracentrifuge moves at and has a radial acceleration of 150,000 g’s (that is, 150,000 times ). The radius of the centrifuge is 0.15 m. You wonder if this claim is correct. Support your answer with a calculation.arrow_forward
- Circular freeway entrance and exit ramps are commonly banked to handle a car moving at 13 m/s. To design a similar ramp for 26 m/s one should: Select one: O a. increase the radius by a factor of 4 Ob. decrease the radius by a factor of 4 O c. increase the radius by a factor of v2 O d. decrease the radius by a factor of 2 increase the radius by a factor of 2arrow_forwardA Ferris wheel with a radius of 9.1 m rotates at a constant rate, completing one revolution every 38 s. Suppose the Ferris wheel begins to decelerate at the rate of 0.21 rad/s2 when the passengers at the top of the wheel. A) Find the magnitude of the passenger's acceleration at that time. B) Find the direction of the passenger's acceleration at that time, in degrees below the direction of motion.arrow_forwardCircular freeway entrance and exit ramps are commonly banked to handle a car moving at 13 m/s. To design a similar ramp for 26 m/s one should: Select one: a. decrease the radius by a factor of 4 b. increase the radius by a factor of 2 c. increase the radius by a factor of 4 d. decrease the radius by a factor of 2 e. increase the radius by a factor of v2arrow_forward
- If a body describes a circular motion under inverse square field, the time taken to complete one revolution Tis related to the radius of the circular orbit as: a) Tcr b) Tc r2 c) T2 c r3 d) Tocr4arrow_forwardV a. R %3D If the speed of a circularly moving object doubled, the centripetal acceleration of that object would 1) increase by a factor of two (2) 2) decrease by a factor of four (4) 3) remain constant 4) increase by a factor of four (4) 5) decrease by a factor of two (2)arrow_forward4. Consider the following controls in an automobile in motion: gas pedal, brake, steering wheel. What are the controls in this list that cause an acceleration of the car? (a) all three controls (b) the gas pedal and the brake (c) only the brake (d) only the gas pedal (e) only the steering wheel (f) none Borough of Manhattan CC FIRST EXAMINATION 5. A particle moves in a circular path of radius r with speed v. It then increases its speed to 2v while traveling along the same circular path. By what factor has the period of the particle changed? (а) 0.25 (b) 0.5 (c) 2 (d) 4 (e) impossible to determine (f) nonearrow_forward
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