Quiz 1

Question 1

What’s the formula for GPE and units

Answer 1

GPE=mgh
J. Kg. m

Question 2

What’s the KE formula and units

Answer 2

KE=1/2mv2
J. Kg. m/s

Question 3

Work formula and units

Answer 3

W=Fd
J. N m

Question 4

7 factors that affect energy use in a home

Answer 4

1. Number of people
2. Climate
3. Size of house
4. Behaviors of people
5. Location
6. Age and design of house
7. Type of E available

Question 5

What uses hot water in a house

Answer 5

Dishwasher, washing machine, sink, showers

Question 6

Major appliances in a house

Answer 6

Fridge, washer/dryer, dishwasher, oven/stove

Question 7

What’s the difference between the other and electronics on home energy chart

Answer 7

Electronics is part of entertainment not easily unplugged - Ex. TV
Other is used for a short period of time easily unplugged - Ex. Blended

Question 8

Define energy transfer

Answer 8

Object—>Object

Question 9

Energy transformation is

Answer 9

Type of E—> Type of E

Question 10

Transfer of E of drive a nail lab

Answer 10

Rod—>nail, tube, block, air

Question 11

Transformation in drive a nail lab

Answer 11

GPE—> KE of motion, heat, sound

Question 12

Transfer of E when a Roller coaster breaks at the end

Answer 12

Car—> track, air

Question 13

Transformation of E when roller coaster comes to a stop at the end

Answer 13

KE of motion—> heat, sound

Question 14

Efficiency is

Answer 14

Amount of E that goes to goal
——————————————
Amount of E used

Question 15

What does it mean to say if something is E efficient

Answer 15

majority of E goes to the goal

Question 16

Which feature makes up the largest part of the E bill

Answer 16

HVAC

Question 17

Why is it so hard to maintain a comfortable environment in a house

Answer 17

In winter heat is moving out and in summer heat is coming in

Question 18

What’s the difference between tank and tankless

Answer 18

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

Question 19

Why does the velocity of the roller coaster car decrease as it goes up the second hill

Answer 19

Bc GPE goes up so more E is going to height

Question 20

Why does the 2nd hill have to be lower that the 1st on a roller coaster

Answer 20

Bc some E is lost to air so not enough E to get back to the same height