Seethanna

Am from Mauritius & I chose global warming....All I need is a good intro. Could anyone help me with it please! Thnx!

The probability of a plane completing 1 mission during a period of the last world war was 0.9. How many missions could be flown before the probability of completing them all became less than one half?

Plz show ur working clearly! Thanks!

Please help me with this. Thanks! 3 fair coins are tossed and D is the positive difference between the number of heads & the number of tails obtained, so that D takes the values 1 & 3. Tabulate the probability distribution of D and calculate E(D).

I'm 17 yrs old & I wanna be a software engineer in life. But the thing is that i did not get the chance to do computer studies at school for O-Level. Now am in HSC (1st yr of A-Level) & I'm doing Maths, Chemistry & Biology as main & G.P & French as sub. Do I still have the chance of doing computer in University later? Because only then I can follow courses on software engineering...I'm really lost here!

(6 * 10^23 H atoms have a mass of 1g)

I badly need Paper 21, 22 & 41 (CIE)

the answer is 5 & 7

(a) Calculate and state clearly the equation that you use to calculate the efficiency of the power station.

(b) Calculate the electrical energy output from the power station in 1 hour. State clearly the equation

that you use and give your answer in joules (J).

The useful power output of a d.c. motor is used to raise an object of 0.75 kg through a vertical distance of 1.2 m in 18s. The constant voltage across the motor and the current through it are 6V and 0.3A respectively. Assuming that the gravitational force on a mass of 1 kg is 10N, calculate the

(a) power input to the motor

(b) work done in raising the load & (c) useful power output developed by the motor.

2 cells of emf 1.5V each and internal resistance 0.5Ω each are connected in series with a parallel arrangement of 3 resistors of 2Ω, 3Ω and 6Ω. Given combined resistance in parallel is 1Ω, find

(a) the effective emf

(b) effective internal resistance

(c) current in the circuit

(d) potential difference across parallel arrangement

(f) current through each resistors.

Plz show ur steps and any help will be appreciated...

A a solid non-electrolyte

B a solid that conducts an electric current when it is melted

C a liquid that conducts electricity

D a gas that dissolves in water to form a solution that conducts an electric current

E a gas that dissolves in organic solvents to form a conducting solution.

I'm using Windows 7(64-bit Operating System)