The half-life of a type of radioactive material is 3 days. How much time does it take for 10 g of this material to decay until the remaining balance is 1.25 g?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked

Mixing salt in water is an example of physical change