Does the air in a balloon have masd

A beaker contains 450g of water at a temperature of 24C, The therman capacity of the beaker is negligible and no heat is gained by, or lost to, the atmosphere.

Which of the following is a consequence of using fossil fuels as an energy source? A. decreased carbon dioxide levels B. increased biodiversity C. increased acid rain D. decreased ecosystem disruption

Fire is an important maintenance process in which biome?

At what height does a 1000 kg mass have a potential energy of 1j relative to the ground

Which statement is true? The moon rotates and revolves at a slower rate than the Earth. The moon revolves around the Earth faster than it rotates. The moon revolves around the Earth much slower than it rotates. The moon does not rotate at all.

What makes the lumbar vertebrae different from the cervical vertebrae and the thoracic vertebrae?

Matter has Certain types of what

Identify the type of relationship that exists between density and temperature

You are standing on the sidewalk and see a bus drive by. What would be an ideal frame of reference? A bird flying overhead A jogger running along the sidewalk A car driving alongside the bus A tree across the street

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?