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  1. ... B. The two balls fell with the same acceleration so they reached the ground at the same time. The two ball ...

  2. Wiki: 太陽質量的大約四分之三是氫,剩下的幾乎都是氦,包括氧、碳、氖、鐵和其他的重元素質量少於2% 太陽質量大=>核心壓力特強=>溫度特高 =>引致氫氣極速撞擊氫氣=>產生核融合反應變成氦 =>E=mc^2:熱能量透過熱輻射(中三物理 熱傳方式之一) 即伽瑪射線...

  3. since energy is conserve so no energy will be loss in the system. that's is loss P.E... when it has higher speed...K.E = 1/2mv^2 So in your case since the ball higher state, so it wil have higher...

  4. There are several ways to do so : (i)Place them in zoo so that veterinarian and animal...those businessmen will not kill them again so as to make profit from them. (vi)Set up a rare...

  5. ... system involves numerous internal forces. So , the simpliest way to do is to take moment about the... >= (x - 8)W x <= 16 cm So , the answer is D. Note that the two...

  6. Quote: The reason that ants can lift so much is because of scaling: ant muscles...rate than the cross-sectional area of its muscles, so those muscles have proportionately more mass to lift. So ...

  7. (a i) Radius of the bob = 1.56 cm So effective length = 92.4 + 1.56 = 93.96 cm (ii) Scale...1603%. (iii) Scale uncertainty of stop-watch = 0.5 s So percentage error in measurement of time = 0.5/36 x 100% = 1...

  8. ...maximum height, t = 0.319 s The hang time is this time times 2 So , the required time = 0.319 X 2 = 0.638 s

  9. ...!Fortunately, they don't ___attack__humans so __scientists_______can __dive____down and get close to them.

  10. 6. As the system is in equilibrium. So , the resultant force is zero in the system. ...weight resolving along the plane - frictional force. So , the net force acting on the object is ...