1.) A CD disk attains its operational speed of 33 rpm in1.2 s. What is the angul

Question

1.) A CD disk attains its operational speed of 33 rpm in1.2 s. What is the angular displacement of the disk during thistime?



a. 2.1 rad

b. 4.3 rad

c. 6.7 rad

d. 8.1 rad

2.) a meterstick is balanced at the 70 cm mark by putting a200 g weight at the 80 cm spot. At what spot will the meterstick bebalanced if the 200 g weight is moved to the 90 cm mark?



a. 83 cm

b. 80 cm

c. 78.9 cm

d. 76.7 cm

1.) A CD disk attains its operational speed of 33 rpm in1.2 s. What is the angular displacement of the disk during thistime?



a. 2.1 rad

b. 4.3 rad

c. 6.7 rad

d. 8.1 rad

Explanation / Answer

2) m = 200 g, mass of the meterstick = M Mg*(70 - 50) = mg*(80 - 70) so 2M = m, so M = 100 g find x Mg*(x - 50) = mg*(90 - x) x - 50 = 2(90 - x) x = 76.7 cm

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