Answer:
Boiling water - The heat passes from the burner into the pot, heating the water at the bottom. Then, this hot water rises and cooler water moves down to replace it, causing a circular motion.
Radiator - Puts warm air out at the top and draws in cooler air at the bottom.
Steaming cup of hot tea - The steam is showing heat being transfered into the air.
Ice melting - Heat moves to the ice from the air. This causes the melting from a solid to liquid.
Hot air balloon - A heater inside the balloon heats the air and so the air moves upward. This causes the balloon to rise because the hot air gets trapped inside. When the pilot want to descend, he releases some of the hot air and cool air takes it place, causing the balloon to lower.
Frozen material thawing - Frozen food thaws more quickly under cold running water that if it is placed in water. The action of the running water transfers heat into the food faster.
Hydrogen's light spectrum is limited to its quanta, so electrons *and photons*, can only travel between the electron orbitals. The light emmited from the sun is almost all the spectrum of light from UV to gamma rays, including the visible spectrum. Thats why there are more lines.
You are dealing with pulleys?
can be done with addition of the two equations to eliminate T.
+
=
we can cancel m₁ by dividing both sides by it, assuming mass is not zero
a₂ = 6.125 m/s² ( do significant digits if you need to)
thirty one and eight over se
venteen kilogram
1. Answer:
It allows scientists to predict things about objects that are too small to see.
Explanation:
Atomic models are crucial to the scientific study of atoms. Through models, we represent atoms that we actually cannot see. Observation based study and testing is done through that model which helps us find flaws in one model so that a better model is made. In this way, it is helpful to study about atoms through atomic models.
2. Answer:
The correct step in a scientific experiment involving acids and bases is:
Using an indicator to measure the hydrogen ion concentration of a solution.
Explanation:
Two acids can never neutralize each other. The pH of a neutral solution is 7. Whereas pH of an acid is always less than 7.
Indicators are used to measure the pH of solutions. They give different colors in solutions with different solutions. So, in an experiment to check if the solution is acidic or basic, we need to measure its hydrogen ion concentration for which an indicator is used.