Melting, boiling, anf bending are physical changes but why is burning a chemical change

A multicellular organism is?

A 4-kg cat is resting on a bookshelf that is 2 m high. What is the cats gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8m/s^2? a. 6 J b. 8 J c. 20 J d. 78 J

A 60 kg person who was at a height 90 meters climbs down to the height of 60 meters what was the change of his gpe

Write about Geothermal energy?

Newton's third law states that when an object exerts force on another object, the second object exerts an equal but opposite force on the first object. Which of the following shows an example of this A. A girl hits a volleyball.

Determine the total mechanical energy of a 250 g baseball if it has a velocity of 30 m/s when it leaves the pitcher's hand 1.2m above the ground.

When distances were carefully measured from Earth to globular clusters above and below the Milky Way plane (where our view of them is not obscured by interstellar dust and gas), their distribution was found to be

Imagine you transfer heat into a gas. This heat splits up in two different ways: Additional thermal energy making the gas hotter and "fuel" for the gas to do work. Let's suppose, 64% of the transferred heat transforms into thermal energy.

How much heat is absorbed by a 61g iron skillet when its temperature rises from 5oC to 29oC?

Explain the relationship between motion and frame of reference.