Search results

  1. D

    Momentum question.

    Oh my mistake. It is v=-eu. Original post edited. I asked this question because nowadays we are doing oblique collisions between a wall and a ball in mathematics. This is an example question(it appeared in exams a few years ago). Velocity of the ball=u angle which the ball makes with the...
  2. D

    Momentum question.

    Guys I'm having a little problem in undersatnding a few things: We have a wall and a ball of mass 'm'. The ball is thrown towards the wall with speed u and rebounds with speed 'v'. The coefficient of restitution is, e is 1/3. The question is to find the value of 'v'. Thats how I think it should...
  3. D

    Two Questions

    No I dont. In my opinion the KE of the ball will be used to open the valve...
  4. D

    Two Questions

    A system is developed as shown in the diagram attached. The ball is initially given a push so that it falls onto a turbine connected to generator which produces electricity. After rotating the turbine the ball fall down a narrow tube with a valve into the water again the ball rises again and is...
  5. D

    A simple question

    This is an actual question from the past papers. The question is: It is stated that many forms of transport transform chemical energy into Kinetic energy. Explain why a cyclist traveling at content speed is not making this transformation and explain what transformations of energy are taking...
  6. D

    Flemings Left Hand Rule

    Well I think when motion is produced by a current in a conduct, we use Flemings Left Hand rule to predict the direction of motion. Whereas, when motion is producing current we use FLEMINGS RIGHT HAND RULE. It’s same as Flemings Left Hand rule but this time you do it with your right hand to...
  7. D

    Calculate the forward driving force which accelerates the car down the slope.

    There is a 760N heavy car on a plane which is inclined to the horizontal at an angle of 6.8 degrees. Calculate the forward driving force which accelerates the car down the slope. I know the answer is 760sin6.8. I know that the forward driving force has a direction which is parallel to the...
  8. D

    Exam question

    Well yesterday it was my physics paper(o'levels) . There was a question there which asked what is the advantage of having cells connected in parallel combination? I wrote that By connecting the cells in parallel combination the total current in the circut is shared by all of the cells as a...
  9. D

    Find the remainder when 1/f(x) is divided by x+1

    It is given that f(x)=8x^3+4x-3. The question is: Find the remainder when 1/f(x) is divided by x+1. My text book says the remainder does not exist!?! I just cant solve it. Thanks in advance for any help. Abdullah
  10. D

    Frequency of collisions of the gas

    Now I get it. Thanks alot whozum. :approve:
  11. D

    Frequency of collisions of the gas

    Thanks alot for your replies whozum. But I really dont think I'm getting you. Can you please provide some explaination. I shall be very thankful to you if do so. :) I personnaly think that the freqency of collisions will be reduced. My teacher says it wont be reduced infact it will remain the...
  12. D

    Frequency of collisions of the gas

    They are directly proportional. I know that the pressure will increase but since the piston is friction less it will move outwards until the pressure inside the syringe is same as it is outside the syringe. But thats not my question.
  13. D

    Frequency of collisions of the gas

    Some gas is put into a gas syringe with a frictionless piston which does not allow the escape of any gas. The gas is initially at 20C and is then heated to 100C. The piston is allowed to move. At 100C a time will come when the piston will stop moving outwards and become stationary(this will...
  14. D

    Upward force on beam

    No, its not. I think you forgot to take the moment caused by the weight of the beam. I think this is how it should be done: (2x784)+(1.5x980) = 3xF This gives us the value of F(Force on the other support)=1012.67N Substracting this value from the total downward force(784N+980N) we get the...
Top