Q1. A wheel 66.0 cm in diameter accelerates uniformly from 211 rpm to 395 rpm in 7.5 s. How far will a point on the edge of the wheel have travelled in this time?
Q2. The average intensity of sunlight at the top of the earth's atmosphere is 1390 W/m2. What is the most energy that a 30 m multiplied by 55 m solar panel might collect in one hour in this sunlight?
Q3. At a certain facility, gross and background counts are made for the same length of time, and a(alpha)=0.050 and B(beta)=0.025. The background is not accurately known beforehand. Calibration at facility shows that one net count corresponds to a sample activity of 260 Bq. The minimum significant measured activity is 159 Bq. compute the minimum detectable true activity.