# Yahoo奇摩 網頁搜尋

1. ### physics question?

you have to know two equation Work=Force*Displacement Force=Mass*Acceleration 10N let 10kg to 1m/s^2 (Acceleration) 10s ->speed to 20m/s it moves (20m/s+10m/s)*10s/2=150m ( Displacement= Area on a...

2. ### Physics 溫習題目 3

1. a) F = (mv-mu)/t = (0.5×1 - 0.5×2)/0.05 = -10N ∴ The force acting on the stone is 10N backward. b) By Newton's 3rd law, force acting on the stone = -force acting on the can ∴ The force acting on the can during the collision...

3. ### phy E&M

...horizontal. 2014-12-24 16:29:46 補充： The physical reason behind is straight forward . The magnetc force acted on the coil, when its plane is horizontal...

4. ### magnetic induction 2

... 1 and 2 are correct. The reason is straight forward . 2014-10-21 15:46:23 補充： 6.(cont'd)... Statement 3 is correct...

5. ### 碰撞問題(物理科的能量不滅27/07/14)

...gt;= Va). Then B will be observed as moving forward from A with a speed higher than that of A. Therefore...

6. ### Work Done

It is zero. W = F·S Now. direction of F is downward and S forward . It gives W=|F||S|cos(90⁰) = 0

7. ### F.4 2條 Phy題 溫書唔識幫幫手 10分

..., change of momentum of gas = 250 x 2000 kg.m/s = 500,000 Kg.m/s Forward thrust = rate of change of momentum = 500 000 N (b) Acceleration of the...

8. ### 關於力與運動的問題 (2)

...collide and drop in speed, the boys inside the car are still moving forward because of inertia. The gives their bodies a feel of...

9. ### 一些關於物理的問題

... you are in a moving bus, you are travelling forward at the same speed with the bus. If you jump up, your speed with the bus...

10. ### Mechanics(action and reaction)

... equal, and the collision is perfectly elastic. Car B would travel forward with the same speed as that of car A before collision. (2) Car A...