What is the half-life of an isotope that decays to 25% of its original activity in 70.8 hours?

A slingshot is used to launch a stone horizontally from the top of a 20.0 meter cliff. The stone lands 36.0 meters away. At what speed was the stone launched?

What city has the highest average concentrations of particulate pollution?

A bicyclist travels 60.0 kilometers in 3.5 hours. What's the cyclists average speed?

The useful power output of the engine is 2.0 kw. Calculate the rate at which energy is absorbed from the hot reservoir.

Of the more than 2,000 known minerals approximately 95% of them belong to what mineral group?

A 25 kg ball is thrown into the air when thrown it's going 10 m/s calculate how high it travels

As part of a circus performance, a man is attempting to throw a dart into an apple which is dropped from an overhead platform. Upon release of the apple, the man has a reflex delay of 215 milliseconds before throwing the dart.

A train travels 90 kilometers in 1 hour, and then 82 kilometers in 5 hours. What is it's average speed?

3. A hydraulic lift is used to jack a 950-kg car 45 cm off the floor. The diameter of the output piston is 23 cm, and the input force is 375 N. a. What is the area of the input piston? (10pts) b.

An electric current in a metal consists of moving (A) Protons (B) neutrons (C) electrons