What is the half life of a radioactive isotope that decreased to one-fourth its original amount in 100 year

If you walk eight blocks north and then three blocks south from your home what is your position compared to your home? what distance did you walk?

Acceleration involves a change in speed or ...

You apply the brakes of your car abruptly and your book starts sliding off the front seat. Three observers explain thisdifferently. Observer A says that the book continued moving and the car accelerated from underneath it.

What is the accereation of a vehicle that goes from 35 m/s to a stop in 35s

A baseball player runs 27.4 meters from the batter's box to first base, overruns first base by 3.0 meters, and then returns to first base.

Explain the relationship between motion and frame of reference.

Two students are looking at a brightly lit full Moon, illuminated by the reflected light from the Sun. Consider thefollowing discussion between the two students about what the spectrum of moonlight would look like.

When performing a battery load test, what should the load be set to?

If you push on a wall of a building what will happen

A conductor, with outer surface labelled a, contains a cavity, inner surface b. In this cavity there is a conducting sphere of radius r, and surface c. The sphere carries a charge of 1 C, while the conductor a charge of 2 C.