12. A gear with a radius of 2 centimeters is turning at
radians/sec. What is the linear
speed at a point on the outer edge of the gear?
11. Strontium-90 decays at a constant rate of 2.44% per year. Therefore, the equation
for the amount P of strontium-90 after t years is
. How long will it take
for 15 grams of strontium-90 to decay to 5 grams? Round answer to 2 decimal places.
13. A circle has a radius of 2 centimeters. Find the area of the sector of the circle formed
by an angle of 30° - If necessary, round the answer to two decimal places.
0.33 sq. cm.
2.09 sq. cm.
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