When water flows in to the cracks of a rock freezes and breaks into smaller pieces is it a chemical or physical change?

A meteorite contains 0.17 g of nickel-59, a radioisotope that decays to form cobalt-59. The meteorite also contains 5.27 g of cobalt-59. How many nickel-59 half-lives have passed since the meteorite formed?

The United States possesses the ten largest warships in the world, aircraft carriers of the Nimitz class.

A rock is thrown 0.8 meters into the air. Find how fast it was thrown.

I go from 5m/s forward to 3m/s backwards. what is my acceleration.

an oil drop of mass 2*10^14 kg carries a charge of 8*10^-18C. The drop is stationary between two parallel plates 20mm apart with a potential difference of V between them. Calculate V

What is the kinetic energy of a 1,900 kg car moving at 89 km/h?

Why do we study black holes

Calculate the kinetic energy of a charging elephant if its mass is 5,000kg and it moves at 8m/s

Why is a decrease in Earth's ozone harmful to life?

What force does a window washer want acting on him when trying to keep the same position