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As physics p1 MCQS YEARLY ONLY.
Because initially it was 4 and then it became 6. That means an additional 2 J was added to the 4. -
As physics p1 MCQS YEARLY ONLY.
mg is the weight, so the force downwards. kv is the air resistance, so the force upwards. The velocity is constant, so there's no resultant force. If you add the two forces, you must get 0. mg+-kv=o. +-=-. 15. WD=Fs. If Fs=2, then 2F2s=x. Cross multiply and you'll get 16. Add that to 4 to get 20. -
AS Physics P1 MCQs Preparation Thread.
13. All you gotta do is choose a pivot and work out the moments on either side of it... 14. mgh=1/2m(v^2). mgh/2 = 1/2m(x^2). Eliminate m, g, and 1/2. Cross multiply. 15. Find the angle to the horizontal of the slope. Then find the component of the weight parallel to the slope. Then use F=ma to... -
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As physics p1 MCQS YEARLY ONLY.
May I? mg-kv=o because the velocity is constant. mg=kv. Rearrange the formula to find v, then use 1/2m(v^2) to find the K.E. -
Chemistry: Post your doubts here!
34. Use Le Chatelier's principle. An increase in temperatue will favour the endothermic side of the reaction. This side produces twice the number of moles. Equation 2 has the same number of moles on each side, so the temperature won't affect the number of moles produced, because the mole ratio... -
Chemistry: Post your doubts here!
You have to make an ICE chart, i.e. initial concentration, change in concentration, and final concentration. The initial concentration of the acid and alcohol is 1 and 1. The change in concentration of the acid and alcohol is -x and -x, and the change in concentration of the ester and the water... -
AS Physics P1 MCQs Preparation Thread.
21. K.E. doesn't increases because the question states that the rate of flow is constant. E.P.E. increases because pressure increases with depth. 17. 30. The electric field strength between two parallel plates is constant. -
AS Physics P1 MCQs Preparation Thread.
8. In an elastic collision, the relative speed of approach = the relative speed of separation. 9. Use F=m(v-u)/t. 12. All you gotta do is locate distances and determine forces. 13. Vertical component of the velocity of a body in projectile motion is 0 at the highest point, so the K.E. can come... -
AS Physics P1 MCQs Preparation Thread.
13. For the 5 N, the perpendicular distance from the pivot is 2 metres. For the 15 N, it's 3 metres and for the 10 N, it's 2 m. In 31, you have to find the rate of flow of ELECTRONS, not charge. So Q=It will turn into Ne=It (N being the number of electrons and e being the charge on one electron). -
AS Physics P1 MCQs Preparation Thread.
I'm afraid I don't know why it's through the origin... -
Physics: Post your doubts here!
7. Diagram 2 shows that there's a zero error. Minus this from the reading on Diagram 1. 10. Final momentum must = initial momentum. Make sure you consider the directions for the velocities. 16. Since it's moving at constant velocity, the force upwards = the force downwards, which is the... -
Physics: Post your doubts here!
I did put in values. Say the variable resistor is 6 ohms and the other two resistors are each 2. 6+2=8. 1/8+1/2=1.6, Increase the resistance of the variable resistor to 8, for instance. 8+2=10. 1/10+1/2=1.7. Current through first loop assuming the EMF=12V=12/8=1.5 and through the second=12/2=6... -
Omg, chemistry paper 1 is next week and i really need help with some of these tyrant questions!!!!!
For 13 you have to know that metals at the top of Groups are similar chemically to metals at the top of adjacent Groups. 18. There's no bi-product, so the elements is ammonium cyanate = the elements in urea, including the numbers. 21. Nucleophilic substitution happens when a nucleophile attacks... -
P1 MCQ's preparation thread for chemistry ONLY!!!!
Draw the alkenes you get when you dehydrate all those alcohols. Count them. Look out for cis-trans isomers. -
Physics: Post your doubts here!
The overall resistance of the circuit increases, so the current in the circuit decreases. But since the current through the first loop also decreases, it remains the same through the second loop. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
9. Since the reaction is reversed, the Kc will become the reciprocal of the forward reaction. So 1/2. Since all the moles are divided by two, the new Kc will be the root of 1/2. 10. Study the graph. L shows the number of molecules with the least energy, M with the average energies and N with the... -
P1 MCQ's preparation thread for chemistry ONLY!!!!
3. Use pV=nRT. 14. The moles of metal nitrate and metal oxide are the same (you can find that by constructing a balanced equation for he decomposition of a Group II metal nitrate). The mass of metal nitrate is given; 3-1.53=mass of metal oxide. n=mass/Mr. mass/Mr of metal oxide = mass/Mr of... -
AS Physics P1 MCQs Preparation Thread.
4. Angular deflection decreases. That means points get closer together (so not much deflection is needed). 8. Since it's a velocity/time graph (and not speed/time), the area will be displacement an displacement is a vector. The upper part will be positive displacement and the lower part will be... -
AS Physics P1 MCQs Preparation Thread.
I don't get why either! My guess is that because we can't compare lines unless they have a common point. But that's just a guess...