Constant Angular Acceleration: A machinist turns on the power on to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of 96 rad/s. The wheel is run at that angular velocity for 40 s and then power is shut off. The wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. For how long a time after the power is shut off does it take the wheel to stop?
A. 64 s
B. 62 s
C. 66 s
D. 68 s
E. 70 s
Answer: A
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Two students, Francis and Dalton, make single-slit slides in order to see the Fraunhofer diffraction pattern themselves. Francis makes a slide with a slit of size a. Dalton's hand slips when she's making the slit, and winds up with a slit twice as wide as her classmate's. They both use the same monochromatic light filtered by their respective slides to project a diffraction pattern on screen a
distance L away. The distance between fringes on Francis' will be 1.two times greater than that on Dalton's. 2.the same as the spacing on Dalton's. 3.half that of Dalton's. 4.some size smaller than Dalton's.
What is your approximate latitude if you observe Polaris to be 35° above the horizon?
A) 35° N B) 35° S C) 55° N D) 55° S E) Polaris cannot be used to find your latitude.
Compare the graph above to Figure 8.14, which shows the decay of potassium-40. Which element is more radioactive (undergoes radioactive decay more quickly)?
A) uranium-235 B) potassium-40 C) Both are equally radioactive.
When we say charges are ‘positive' or ‘negative' we are speaking of
a. two intrinsically different types of charge found in nature b. an excess vs. a deficiency of charge c. charges existing vs. not existing d. none of the above