Now suppose you were using plutonium 239 in a nuclear fission reactor. how long would it take 20 g of radioactive plutonium 239 decay down to a safe 2.5 g? show work.

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

What sort of waves exhibit the doppler effect?

A75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high-efficiency motor that has an efficiency of 95.4 percent. the motor operates 4368 hours a year at a load factor of 0.75. taking the cost of electricity to be $0.12/kwh, determine the amount of energy and money saved as a result of installing the high-efficiency motor instead of the standard motor. also, determine the simple payback period if the pu