Igcse Definition and 12 Threads

I know a sketch diagram is required for the question but they haven't specified the distance from the beam to the lens. They've just given the height of the beam. So how do I know how far I should place the object? Should the object (beam) be at infinity?

I have been teaching myself matrices for my IGCSE course and I ran into a problem in a past paper which I have no clue how to solve. The problem is part b of the attached image. Thanks for your help in advance.

Hi, very quick question... It does like this: Helium in a cylinder (Which will be used to inflate a number of balloons) has a volume of (6*10-3) cubic meters and a pressure of (2.75*106)Pa. The pressure in each of the helium balloons is (1.1*105)Pa, and the volume of each balloon (3*10^-3) cubic...

Homework Statement Homework EquationsThe Attempt at a Solution I tried cross multiplying but obviously that is not the case. These types of questions are the ones I always lose marks in. Any help would be appreciated.

Homework Statement Homework EquationsThe Attempt at a Solution I need help with the second question, I did the first one correctly. My pre board is on Monday so please help.

Homework Statement A rocket of force 1000N is propelled upwards by a thrust of 1800N. The air resistance is 500N. a) Work out the resultant force on the rocket. A bungee jumper of mass 60kg jumps from a bridge tied to an elastic rope which becomes taut after he falls 10m. Consider the jumper...

Captain Ahab sails The Laertes along the south coast of Madeira. On any day, the probability of him seeing a dolphin is 9/10 , the probability of him seeing a whale is 2/3 and the probability of him seeing a turtle is 1/5. Q. Calculate the probability that on any day Captain Ahab will see...

Homework Statement The helium in the cylinder has a volume of 6.0 × 10^–3 m3^-1 (0.0060 m^3) and is at a pressure of 2.75 × 10^6 Pa. (i) The pressure of helium in each balloon is 1.1 × 10^5 Pa. The volume of helium in an inflated balloon is 3.0 × 10^–3 (0.0030 m3). The temperature of the...

Basically there is a cardboard with a small hole for a wire and a large circular hole for another wire. Two wires, one rigid is passed through the small hole and another flexible wire is passed through the large circular hole. A battery is connected to both ends of both wires so that the current...

Homework Statement please calculate the position of vector M and explain how it happens Homework Equations The Attempt at a Solution

I am having a problem with one of my Probability homework questions. A goalkeepr expects to save one penalty out of every three. Calculate the probability that he : 1- Saves one penalty out of the next three, 2- Fails to save any of the next three penalties, 3- Saves two out of the...

I have found IGCSE past papers and resources at [PLAIN]www.Cie.org.uk[/url] or www.freeexampapers.com Go in and check it out! You need to register before you can see the papers section.