internal energy (topic 3)

Question 1

(2)

Answer 1

• it is the cheapest
• has the shortest payback time

Question 2

(1)

Answer 2

the bigger the surface area, the faster the water cools down / temperature falls

Question 3

(2)

Answer 3

• have large surface / area
• radiate heat, loses heat

Question 4

Answer 4

radiation
conduction

Question 5

Answer 5

• black
• best absorber (of infrared)

Question 6

why does the cooking pot have a lid (1)

Answer 6

to reduce energy loss

Question 7

Answer 7

• mass (of block)
• starting temperature
• voltage / p.d.
• power (supplied to each block)
• thickness of insulation

Question 8

Answer 8

• (type of) material is categoric
• the data is categoric

Question 9

Answer 9

• concrete
• (heater on for) longest time

Question 10

Answer 10

20
(must use line of best fit which starts at 20)