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  1. Momentum is a vector quantity. You need to use vector substraction in calculating the change of linear momentum. Since change of momentum = final momentum ...

  2. Part 1) From the tracks provided, we can estimate that the max. separation between successive 2 steps of Tyrannosaurus rex is about 6 m Thus the max. ...

  3. Take downward be +ve and g=9.81m s^-1 (a) consider vertical direction. v^2 - u^2 =2as v^2 - 0 = 2gs v^2 = 2(9.81)(30) v=24.261m/s ...

  4. (a) Net force = (1200 - 400 -200) N = 600 N Hence, acceleration = 600/(800+200) m/s2 = 0.6 m/s2 (b) Let T be the tension in the towbar, use net-force = ...

  5. b)according to (a),work=4J work=change of kinetic energy 4=mv^2/2 - mu^2/2 u=0 4=mv^2/2 v=32.7m/s c)ii) hor dis=u^2sin(2x40)/g =101m

  6. When taking moment about the respective hinges of P and Q, W makes clockwise moment to both of them. So in order to balance the moment, rod P should ...

  7. As I have already pointed out in my other answer to you. The crucial point is whether there is friction present between the block and wedge. If friction ...

  8. Be aware that the question aks for the "normal reaction" exerted by the ground on the wedge. By "normal" reaction, it means the ...

  9. When extension = 0.08 m, the tension of the spring is 100 x 0.08 = 8 N. Also, the component of the block's weight down the plane is 10 sin 30 = 5 N. ...

  10. a) Using the relation v = Rω, we have v = 0.11ω b) During sliding, the constant friction f continuously acts on the ball at the point of contact between ...