quiz 4 Flashcards
What is the equation for calculating kinetic energy(in words)
kinetic energy= 0.5 x mass x velocity squared
what is the equation for calculating efficiency as a decimal?
efficiency= useful energy output/total energy input
How can we reduce the amount of energy objects lose by heating?
increasing thermal insulation
What is the relationship between thermal conductivity and the rate of energy transfer across the material?
The higher the thermal conductivity, the higher the rate of energy transfer across the material
What is the equation for calculating efficiency as a percentage?
efficiency= 100 x useful energy output/total energy input
what does dissipated mean?
Lost to the surroundings as thermal energy
what are the units for mass
kilograms,kg
what are units for velocity
meters per second ,m/s
If a machine has moving parts, how can we reduce unwanted energy transfers?
Lubrication
Why is efficiency never 100%
Energy is always dissipated to the surrondings
What is the equation for calculating kinetic energy(in symbols)?
Ek=0.5 x m x v squared
what is wasted energy?
Energy that is not transferred in useful ways
