Quiz 1 Flashcards
What’s the formula for GPE and units
GPE=mgh
J. Kg. m
What’s the KE formula and units
KE=1/2mv2
J. Kg. m/s
Work formula and units
W=Fd
J. N m
7 factors that affect energy use in a home
- Number of people
- Climate
- Size of house
- Behaviors of people
- Location
- Age and design of house
- Type of E available
What uses hot water in a house
Dishwasher, washing machine, sink, showers
Major appliances in a house
Fridge, washer/dryer, dishwasher, oven/stove
What’s the difference between the other and electronics on home energy chart
Electronics is part of entertainment not easily unplugged - Ex. TV
Other is used for a short period of time easily unplugged - Ex. Blended
Define energy transfer
Object—>Object
Energy transformation is
Type of E—> Type of E
Transfer of E of drive a nail lab
Rod—>nail, tube, block, air
Transformation in drive a nail lab
GPE—> KE of motion, heat, sound
Transfer of E when a Roller coaster breaks at the end
Car—> track, air
Transformation of E when roller coaster comes to a stop at the end
KE of motion—> heat, sound
Efficiency is
Amount of E that goes to goal
——————————————
Amount of E used
What does it mean to say if something is E efficient
majority of E goes to the goal
Which feature makes up the largest part of the E bill
HVAC
Why is it so hard to maintain a comfortable environment in a house
In winter heat is moving out and in summer heat is coming in
What’s the difference between tank and tankless
Tank
-what’s up 80-10, gallons 24/7
-less efficient
-can get hot water faster but it can run out
Tankless
-heats water on demand
-more eff
-can take a while to heat up
Why does the velocity of the roller coaster car decrease as it goes up the second hill
Bc GPE goes up so more E is going to height
Why does the 2nd hill have to be lower that the 1st on a roller coaster
Bc some E is lost to air so not enough E to get back to the same height
