Homework

Year 11 Homework

Vectors

The above is worth looking at, the second half is an old music video


Vector Addition - Funny video clips are a click away


Vector Addition - Funny video clips are a click away

Evolution Revision Questions and Answers

Questions

Revision Evolution MC Question 1
Revision Evolution MC Question 2
Revision Evolution MC Question 3/4
Revision Evolution MC Question 5
Revision Evolution MC Question 6
Evolution Revision MC Question 7
Revision Evolution MC Question 8


Answers
Revision Evolution MC Answer 1
Revision Evolution MC Answer 2
Revision Evolution MC Answer 3/4
Revision Evolution MC Answer 5
Revision Evolution MC Answer 6
Revision Evolution MC Answer 8
Revision Evolution MC Question 9

One note Topic 2 and 3 review

http://ebhigh.com/drhill/year11%20docs/Electrical%20Energy.onepkg

http://ebhigh.com/drhill/year11%20docs/Electrical%20Energy2.pdf

additional problems

Catholic link

History of Magnetism

History of magnetism
800 BC - Greek peasants began using iron nails in their shoes, a shepherds shoe got stuck on a naturally occurring magnet, ancients believed that all magnets were attracted to this shepherds mountain in the province of Magnesia.
For over a thousand years Greeks made money by selling load stones
1585AD - Dr Gilbert (Queen Elizabeth I doctor) researched Amber (fossilised tree sap)(electrons) and the famous Dr Gilberts Balls were made out of magnets and he presented them to Queen Elizabeth I. He proved the earth was a giant magnet

Around 1785 - They found currents in wires made magnetic fields are wires with currents jumped in magnetic fields

Lesson on Resistance and Power

Question 1 (Worked Example) Define Power and how it is calculated.

Power is the rate that Energy (joules) is converted form one form (electrical) to another (heat).

It is calculated from 4.8 J for each ml of water increased by 1 degree, or VxI. It has units of watts.

Question 2 What is the formula for Energy. What units are used to buy Energy.

Question 3 (Worked Example) Zany has a 1kW pool pump that operates from 8am to 10 am every day of the year. Electricity cost $ 0.25 per kWhr. What is the annual use of energy? How much does this cost Zany?

P = E/t

E = P x t

E = 1kW x 2hr x 365

E = 730 kWhr

Cost = E x rate per kWhr

Cost = 730 x 0.25 = $182.50

Question 4 Tom has as 4 bar fridges that use 200 W. How many joules of energy does he use in a year? Why is kWhr the normal unit seen on his bill?

Question 5 (Worked Example)

Anne can use 6 V on a 10 ohm light, or 12 volt on a 40 ohm light. Which produces most power? If the leads are 1 ohm, which is the brighter light?

Thus they have the same brightness. Power loss can be calculated by working out the total resistance, the current and voltage drop and then the Power loss.

Fribulation

Worked Homework

Question 9

question 9

Question 10

Question 10

Question 16

Question 11

22 Minute lecture on electrical Safety

Electrical Energy in the Home : Safety

Evolution Experiment

A start population 120 coloured tooth picks. Consisting of 6 colours of 20 sticks each.





The 120 were dispersed over a 15 x15 m area.





Two student preditors collected 10 sticks each.





From the kills the field population was calculated.





The field number divided by 5, was the number off spring that were generated and added and distributed to the field population.





In the sequence





Species - Sticks


Trait - Colour


Variation - Yellow, Orange, Red, Blue, Green,Purple


Selection - Not being Predated


Reproduction


Evolution.



We had predation out strip replacement due to over efficient predation.

The photo shows the final population after 7 seasons, havested from the field.