Why do we need climate models? Climate models are important tools for improving our understanding and predictability of climate behavior on seasonal, annual, decadal, and centennial time scales. Models investigate the degree to which observed climate changes may be due to natural variability, human activity, or a combination of both. What are the potential causes […]
What is the color of kindness?
How does thermal energy transferred?
How does thermal energy transferred? Thermal energy typically flows from a warmer material to a cooler material. Generally, when thermal energy is transferred to a material, the motion of its particles speeds up and its temperature increases. There are three methods of thermal energy transfer: conduction, convection, and radiation. What is it called when thermal […]
Can a catalyst start a reaction?
Can a catalyst start a reaction? Catalysts interact with reactants so the reaction can occur by an alternate pathway that has a lower activation energy. Activation energy is the energy needed to start a reaction. The catalyst brings the reactants together by temporarily bonding with them. Which is false for Catalyst? Catalyst never starts a […]
Why does the air in a hot air balloon need to be hot?
Why does the air in a hot air balloon need to be hot? It decreases with increasing altitude and changes depending on the temperature and humidity. Hot air balloons use hot air to create buoyancy, which results in allowing the balloon to float and carry passengers riding in the basket. The hot air inside of […]
Is thermal energy negative or positive?
Is thermal energy negative or positive? The question is, how is the amount of energy transferred into or out of an object related to that object’s temperature change? Note that the heat transferred is negative if the object drops in temperature (ΔT<0), so we define heat as positive when it transfers into an object, and […]
What is the significance and importance of mitosis and meiosis to life?
What is the significance and importance of mitosis and meiosis to life? Mitosis and meiosis both involve cells dividing to make new cells, which makes them vital processes for the existence of living things that reproduce sexually. Meiosis makes the cells needed for sexual reproduction to occur, and mitosis replicates non-sex cells needed for growth […]
What is SI unit of density?
What is SI unit of density? Density is commonly expressed in units of grams per cubic centimetre. For example, the density of water is 1 gram per cubic centimetre, and Earth’s density is 5.51 grams per cubic centimetre. Density can also be expressed as kilograms per cubic metre (in metre-kilogram-second or SI units). What does […]
How many times will a heartbeat in half an hour?
What are the two types of biofuels?
What are the two types of biofuels? The two most common types of biofuels in use today are ethanol and biodiesel, both of which represent the first generation of biofuel technology. The Bioenergy Technologies Office (BETO) is collaborating with industry to develop next-generation biofuels made from non-food (cellulosic and algae-based) resources. What are 4 examples […]