1. -15 points My Notes prelab for Physics 1250 lab \"Rotational Dynamics\" Which

Question

1. -15 points My Notes prelab for Physics 1250 lab "Rotational Dynamics" Which of the following statements about this lab are true? s measured. O You should take the average of the acceleration data in an appropriate time interval. O Logger Pro™ will report the angle, angular velocity and angular acceleration of the big wheel, not the rotation sensor. O If the large wheel is rotating clockwise, the friction from the large wheel's bearings will cause a clockwise angular acceleration. In the figure, the signs are correctly given as: | sign? sign? sign? Large wheel (big circle), bearing (grey) and axle (black). The solid arrows represent friction forces. The open arrow shows the direction of rotation (CW). Suppose the big wheel we use in this lab has a radius of 34 cm. If the hanging block drops 45 cm, what is the magnitude of the angular displacement of the big wheel? rad Submit Answer Save Progress Practice Another Version

Explanation / Answer

Ans:-I the large wheel is rotating,the friction from the large wheels bearing will cause a clockwise angular acceleration

As the hanging block drops 45 cm, 45 cm of string rolls off the circumference of the big wheel.

The radius = 34 cm
45 cm ÷ 34 cm/ radian = 1.32 radians

So the big wheel rotated 1.32 radians

2nd method
1 circumference = 2 * * r = 2 * * 34 = 213.5 cm
45 cm ÷ 213.5 cm/1 rotation = 0.211 rotations

So, the big wheel rotated 0.211 of a circle

1 rotation = 2 * radians
0.211 * 2 * = 1.32 radians

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