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20 Nov 2019

A jogger runs around a circular track of 30m radius at aconstantspeed in a clockwise direction. He completes one lap in 40seconds.


c.) Is the magnitude of his average velocity from A toBbigger, smaller or equal to the magnitude of his averagevelocityfrom A to C? Explain your reasoning.
d.) What is his angular velocity?

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Tod Thiel
Tod ThielLv2
1 Sep 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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A runner taking part in the 200-m dash must run around the end of a track that has a circular arc with a radius of curvature of 30 m. If he completes the 200­-m dash in 23.2 s and runs at constant speed throughout the race, what is the magnitude of his centripetal acceleration as he runs the curved portion of the track?

  1. An object moves clockwise with decreasing speed around an oval track. The velocity vectors at points G and H arc shown.

a. In the space at right, copy the velocity vectors  and  . From these vectors, determine the change in velocity vector .

b. If point H were chosen to lie closer to point G, describe how  would change (direction and magnitude).

 

c. Describe how you would determine the acceleration (direction and magnitude) at point

G. In the space at right, indicate the direction of the acceleration of the object at point G.

d. Copy  and  (placed "tail-to-tail") in the space at right. How does the angle between the acceleration and velocity vectors compare to 900? (i.e., Is the angle greater than, less than, or equal to 90°?)

e.

Generalize your results above and from tutorial to answer the following question:

For an object moving along a curved trajectory, how does the angle between the acceleration and velocity vectors compare to 90° if the object moves with (i) constant speed, (ii) increasing speed, and (iii) decreasing speed?

 


A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the sketch in Figure. The current in the wire points to the right and is of magnitude I. In which direction must current flow in the loop to produce zero magnetic field at its center?

A) Counterclockwise

B) Clockwise

C) It is indifferent if clockwise or counterclockwise.

D) The current in the loop should be zero A.

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