Question 1

1. newton

2. drag force, ^ magnetic force, _ weight

3. ?

4. s=d/t

   (0,61) ( 62,55)

   d=st

   (6x62)/2 = 183

   55x61 = 3,355

   3,355 + 186 = 3,541

5. less change in speed, almost a striaght line

Question 2

1. power, equal to

2. 240x60 = 14,400

   14,400/1.2 = 12,000V

3. 0.98 = x / 14,400

   x = 14,400 x 0.98

   x = 14,112V

4. When electricity travels over long distances, some energy will be lost as R. According to P=VI, when P is constant, if V increases then I will decrease. Therefore according to the formula for power lost P = I^2R, if voltage increases then I will decrease and this will make the heating loss in wire less and increase efficiency.

Question 3

1. Radiation → em radiation

   Conduction → direct contact

   Convection → moving fluids

2. D

3. condensation, gas to liquid

4. salt water is not cold enough at the bottom and colder at the top.

5. The ice cube melts more slowly in the salt water because it is more dense and therefore there is less convection occurring in the saltwater than the pure water, therefore heat transfer is less in the salt water.

6. reaction would take place at a faster rate as the cold water is evenly distributed

Question 4

1. How does the length of a tube affect the sound being produced by blowing in it?