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  1. E

    Physics: Post your doubts here!

    Yes, its the net work done
  2. E

    Physics: Post your doubts here!

    As the ball moves from X-Y, the speed is increasing uniformly. From Y-Z, it has a constant speed. They say that the collision with the wall is inelastic. So, the rebound speed is lesser than the impact speed. v=s/t When v decreases, that means that t increases. Longer time
  3. E

    Physics: Post your doubts here!

    Can I know the answer for Q24? For Q 20: At P (The pressure is balanced): 16000-8000= 13600( H1-H2)9.81 H1-H2= 6cm Ans D
  4. E

    Physics: Post your doubts here!

    Because when the water flows from X to Y until its equal, X would have lost half of its mass and half of its height PE loss= 1/2m*g*1/2h =mgh/4
  5. E

    Physics: Post your doubts here!

    For 16: 3= I1(6*10^3) I1= 0.5mA 3= Current flowing in 2nd loop(3*10^3) I= 1*10^-3 I2 is a combination of I1 and the current flowing in the 2nd loop, I2=1.5mA Pd across 6k resistor= (0.5*10^-3)(6*10^3) = 3V Pd across 3k resistor= (1*10^-3)(3*10^3) = 3V Total pd = 6V Whats the year? I might be...
  6. E

    Physics: Post your doubts here!

    Is 16 D? For 2: Distance XY= 5-1=4 Uncertainty= 0.2+0.2=0.4 Diameter for 1 ball= 4/4=1 Uncertainty= (0.4/4)*1 =0.1 Ans B
  7. E

    Physics: Post your doubts here!

    Stress= 1*10^9 Area= 1/4*3.142*(1*10^-3)^2 =7.855*10^-7 Force= 785.5N The question asks what the range includes this value, so ans is C
  8. E

    Physics: Post your doubts here!

    The weight of the man is supported by the 2 cables. Tension in 1 cable= (80*9.81)/2 = 392.4N Stress= 392.4/ 1/4*3.142* 0.005^2 Strain= 0.001/10 E=2.0*10^11 Pa
  9. E

    Physics: Post your doubts here!

    Resolve the Tension of the string perpendicular to the weight= Tcos30=0.15 T=0.1732N Now resolve the tension of the string horizontal to the air flow= 0.1732* sin30= 0.087N
  10. E

    Physics: Post your doubts here!

    WD by the Driving Force= PE gain + KE gain Here question says minimum WD, they give us no information on the speed whatsoever, so assume that there is no KE gain WD = PE gain= 50*9.81*1.6= 784.8J = 780J
  11. E

    Physics: Post your doubts here!

    First find the resistance of the 2 wires: Resistance is 0.005 ohm per m, the length of a wire is 800m R for 1 wire= 800*0.005=4 ohm Total R for cable (2 wires)= 4*2=8 Current in circuit= 0.6A PD across cable= 0.6*8=4.8 Emf= 4.8+16=20.4V
  12. E

    Physics: Post your doubts here!

    Percentage uncertainty of current= 0.05/2.5 * 100=2% P= (I^2)R Percentage uncertainty of P= 2(2)+2=6%
  13. E

    Physics: Post your doubts here!

    Is it C?
  14. E

    Physics: Post your doubts here!

    For an object in equilibrium, the forces acting on it has to have a concurrent point which means they have to have a common point of intersection. If you extend the forces they should intersect at a common point. For A there is no concurrent point
  15. E

    Physics: Post your doubts here!

    1. Boiling: occurs at a fixed temperature, that is the boiling point of the liquid. Its a process that occurs throughout the liquid. Basically for boiling, you are heating up the entire liquid. The heat is being distributed evenly throughout the liquid and the speed of the molecules increases...
  16. E

    Physics: Post your doubts here!

    Voltmeter normally has very high resistance to make sure that current doesn't flow through it when it measures the pd across an object. It cannot be A because since the voltmeter is connected in series , the current would have to pass through the voltmeter before it can reach the ammeter. Very...
  17. E

    Physics: Post your doubts here!

    It's evaporation because evaporation is a process which depends on the velocity of the water molecules. If the molecules at the surface possess enough energy then they are able to escape the forces that hold the molecules together and then escape as vapour. But the question states that all the...
  18. E

    Physics: Post your doubts here!

    Is it C?
  19. E

    Physics: Post your doubts here!

    They say that wheel friction is constant throughout the motion. Therefore, from the graph when there is 0 velocity, the wheel friction is 8kN. The total resistive force (wheel friction+ air resistance) at v=200 is 40kN. Ratio= 32k/4k= 8
  20. E

    Physics: Post your doubts here!

    KE= PE+KE 1/2(m)(28)^2=m(g)(22)+1/2(m)(v)^2 The initial KE is converted into PE when it leaves the exit road since the road is 22m higher than the motorway. Since they ask the final speed this means that not all KE is converted into PE, hence there is remaining KE
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