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1. ### Please prove that the lost of KE is the largest when it undergoes perfectly inelastic collision (stick together after collision )?

...that the relative velocity between the two colliding objects after impact is zero. In other words, the two objects move with the same velocity Vc (say) after collision . Loss of kinetic energy E = initial kinetic energy (Ei) - final kinetic...

分類：科學及數學 > 物理學 2016年12月23日

2. ### Explain why photoelectrons have different speed while their incident photons have fixed energy.?

...electron may need to undergo a number of collisions with the material atoms before it escapes from the material. The is the main reason for the variation in kinetic energy of the photo-electrons...

分類：科學及數學 > 物理學 2016年11月05日

3. ### Why (3) is not correct?isn't infrared produced? Isn't black body radiation produced?

... object, not necessary gas, with a temperature emits electromagnetic... radiation so emitted is caused by collisions between molecules in the object, which possess thermal kinetic energy...

分類：科學及數學 > 物理學 2016年11月05日

4. ### problem in momentum?

(a) Find the value of m2. m1*v1 = m1*v1' + m2*v2' m2 = m1(v1 - v1')/v2' = m1(v1 - v1')/(4v1/5) = 5m1(v1 - v1')/4v1 (b) Find the relation between v1' and v1. m2 = 5m1(v1/4v1 - v1'/4v1) m2/5m1 = 1/4 - v1'/4v1 v1'/4v1 = 1/4 - m2/5m1 v1'/v1 = 1/16 - m2/20m1 v1' = v1(1/16...

5. ### momentum and time

... impulse = integral{F(t).dt} with limit of integration from t = 0 to t = 2(to) where to is the original impact time. 2015-08-03 15...impact time", which usually used in the case of collision . 2015-08-03 15:52:46 補充： Q...

6. ### momentum

...the ball. 2015-07-04 00:43:07 補充： In 5b, the ball doesn't rebound...), hence its final momentum is zero. 2015-07-04 00:45:15 補充... there is NO collision at all, as there is NO...

7. ### Momentum

1. Where is the diagram? 2. (a) Use momentum conservation 0.08 x 3 = (0.08 + m) x 1.6 where...kg (b) Force = 0.07 x 1.6/1 N = 0.112 N The force is frictional force. 3. (a) The final momentum is the resultant of the individual...

8. ### 物理題，求算式，thank you!

... for 4.6 s by the collision with car B? The most simple approach is to find the speed of car A after collision using conservation of momentum. But in this case, if the two cars are ...

9. ### Physics 溫習題目 5

... impulse = change of momentum of the block F(0.2) = 1 x 5 where F is the force acts on the block F = 25 N 2. (a) Fall in height of the person = (30 - 2.75) m = 27.25 m Use equation: v^2 = u^2 + 2as...

10. ### Physics 溫習題目 3

... ∴ The speed of truck Q before the collision was 18.5 ms⁻¹ to the front. 2015-06-16 21:34..., If the can travels together with the stone after the collision , asking the velocity...