19. A 6kg pendulum is released from rest 90m above the ground.

 

    a) What is its velocity at the bottom?

 

    b) If it takes 3 seconds to reach the bottom, what is the power generated?

Nineteen (19) 137Cs radiation therapy sealed sources totaling 0.604 Ci were stolen from Moses Cone Hospital in Greensboro, NC and never recovered (true story). 137Cs emits a 0.667 MeV gamma ray. What is the dose rate at 4 feet from the sources?

What's your normal body temperature? It may not be 98.6°F,theoft-quoted average that was determined in the nineteenthcentury. Amore recent study has reported an average temperature of98.2°F.What is the difference between these averages,expressed inCelsius degrees?

Two test charges are brought separately into the vicinity of acharge +Q. First, test charge +q is brought to point A a distance rfrom +Q. Next, +q is removed and a test charge +2q is brought topoint B a distance 2r from +Q. Compared with the electrostaticforce on the charge at A, the force on the charge at B is
1
a factor of 4 weaker.
the same.
a factor of 4 stronger.
a factor of 2 stronger.
a factor of 2 weaker.
.