University Physics Test 1 Spring 18 M. Ardebi 6) A car travels counterelockwise

Question

University Physics Test 1 Spring 18 M. Ardebi 6) A car travels counterelockwise around a flat circle of radius 0.25 km at a constant speed of 20 ms. When the car is at point A as shown in the igure, what is the car's acceleration? A) 16mouth D) 1.6ms, morth B) Zere C)16 ms, east E) 16 ms, west 7) The position of a particle moving along the x axis has a position given by x(t)-20.0+30.0-5.00t (a) Find the particle velocity at t-3.00 (b) Find the particle average velocity for time interval 0.00 to 3.00 s. 8) A person walks 3.25 km north then 2.75 km northwest and then 1.50 km 30 degrees south of west. eketch thedisplacements. (b) Find magnitude and direction of the resultant displacement.

Explanation / Answer

6)

Acceleration is the centripetal acceleration here:

ac = v2/r

= 202/250 = 1.6 m/s2

The direction is radially inwards.

Thus the correct option is:

(E) 1.6 m/s2, west

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