Questions tagged 'Energy'
32 questions
From greatest to least, rank the energy needed for these phase changes for equal amounts of H2O: (a) from ice?
Rank the energy required for the following phase changes of equal amounts of H2O from greatest to least: (a) from ice to liquid water, (b) from liquid water to boiling water, and (c) from boiling wate...
Jan 18, 2025
What is the energy (in joules) of an ultraviolet photon with wavelength 110 nm? What is its frequency?
What is the energy, in joules, of an ultraviolet photon with a wavelength of 110 nm? Additionally, could you provide its frequency?
In the respiration equation, does energy act as a reactant or a product?
In the context of the respiration equation, does energy function as a reactant or a product? Please provide an explanation for your answer.
Convert m^2/s^2 to kJ/kg?
How do I convert m²/s² to kJ/kg? Could you please provide a detailed explanation of the conversion process and any relevant formulas? Thank you!
One physics question about work/change in energy?
Harold the Hurler is a physics student known for his exceptional baseball pitching arm. To determine the amount of work he performs when throwing a baseball, Harold devises an experiment. He stands at...
Dec 19, 2024
A heat engine does 15 J of work per cycle while exhausting 35 J of waste heat.?
A heat engine performs 15 J of work per cycle while exhausting 35 J of waste heat. What is the thermal efficiency of the engine? Please provide your answer as a percentage.
Dec 14, 2024
what is energy that is stored up in a substance called?
What is the term for energy that is stored within a substance, such as in its chemical bonds or due to its position? Could someone explain this concept? Thank you!
An internal explosion breaks an object, initially at rest, into two pieces, one of which has 2.1 times the mas?
An internal explosion breaks an object, initially at rest, into two pieces. One piece has a mass that is 2.1 times greater than the mass of the other piece. If 8500 J of energy were released in the ex...
Calculate the max power in kW that can be produced using the standard enthalpy of the reaction?
An experimental spacecraft consumes a specialized fuel at a rate of 210 L/min. The density of this fuel is 0.690 g/mL, and the standard enthalpy of combustion is –39.8 kJ/g. Calculate the maximum powe...
In a hydroelectric dam, water falls 33.0m and then spins a turbine to generate electricity.
In a hydroelectric dam, water falls 33.0 meters and spins a turbine to generate electricity. A. What is the change in potential energy (ΔU) of 1.0 kg of water during its fall? B. If the dam operates w...