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1. 排列方式

1. ### PHYSICS(MECHANICS)

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. ### physics---mechanics

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. ### phy-mechanic

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. ### physics---mechanics

(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. ### physics---mechanics

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. ### phy(mechanics)

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. ### phy(mechanics)

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. ### phy (mechanics)

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

9. ### phy (mechanics)

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. ### physics(mechanics)

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 ...