2) A car is making a turn at a constant speed. True or false: the car\'s acceler

Question

2) A car is making a turn at a constant speed.

True or false: the car's acceleration is not zero. True False

3) When an object is swug around in a circle at the end of a rope, its speed is equal to the circumference of the circle divided by the tension in the rope. True false

4) To one significant figure, a radian is equivalent to about 60 degree. True false

5) By convention, clockwise rotations are considered negative true false

6) An object rotating at 500 rmp is spinning faster than an object rotating at 500 rad/s true false

Explanation / Answer

Part 1)

Apply Torque = I(alpha)

F1(cos 23)(.26) = (.68)(alpha)

16(cos 23)(.26) = (.68)(alpha)

alpha = 5.63 rad/s2

Part 2)

False Turning means you have a change in direction. Acceleration is a vector quantity that deals with both speed and direction changes. Since your direction is changing, you are accelerating.

Part 3)

False - Speed is Circumference over time, not Tension

Part 4)

True - There are 2pi rad in a circle. 60 degrees is 1/6 of a circle. 1/6th of 2pi = 57.3 degrees which rounds to 60 with one sig fig

Part 5)

True - This is the standard convention for torques

Part 6)

False

500 rpm converts by multiplying by 2pi rads per rev and dividing 60 sec per min

500 rpm = 52.4 rad/s

Thus 500 rad/s is faster than 52.4 rad/s (which was 500 rpm)

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