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1. ### Maths problem: how to do, thanks?

...and 2k (in g) of rice and beans, respectively, to the mixture, where k is a positive constant. The new weight of beans is (32 + 2k) g. The new weight of rice is (18...

分類：科學及數學 > 數學 2020年08月04日

2. ### Please check my calculation. Very confused. Gravitation.?

...earth (i.e. along the radius of the earth R). This is not the " weight " that we measured, say using a spring balance, on earth surface because part of W is shared by...

分類：科學及數學 > 物理學 2016年12月27日

... under an acceleration, is said to be in a "non-inertia reference system"(非慣性系統). In...from the right wheels N2 (counterclockwise moment), the weight of the car (mg) (clockwise moment) and the centrifugal force at the...

分類：科學及數學 > 物理學 2016年12月26日

4. ### Can you answer the following questions?

... at top of pier = 500/5^2 kPa = 20 kPa Total weight of pier = 20 x (5 x 5 x 6) kN = 3 000 kN Hence, total load...

分類：科學及數學 > 物理學 2016年11月15日

5. ### Phy Archimedes' Principle 問題求解?

1( a ) Weight of block = 0.5^3 x 800g N = 981 N (where g is the acceleration due... to be 9.81 m/s^2) (b) By Principle of Flotation, weight of water displaced = 981 N (c) Volume of water displaced...

分類：科學及數學 > 物理學 2016年10月24日

6. ### 力學問題求解(物理)?

...to lift = 8000 x 2 W = 16,000 W = 16 kW a (2) Power lost by friction = (20 - 16) kW = 4... = 6 kW b(2) The installation of balance weight (平衡錘) leads to less power output from the motor. ...

分類：科學及數學 > 物理學 2016年09月14日

7. ### [F.6 MATH] Arithmetic Sequence Application?

( a ) Let Tn denote the production time in min. for the n-th machine T1...100/5) = (2/5)( 240 + 230 + ...... + 100 ) = 0.4 * (240+100)*15/2 = 1020 Ans : ( a ) 240, 230 and 220 min respectively. (b) 100 min (c) 1020 kgs

分類：科學及數學 > 數學 2016年09月10日

8. ### Q1. The ---------- is interviewed by the company director. Q2. Einstein made countless ---------- in the science field.?

Interviewee Inventions

9. ### Relative error點解急急急急急急急急急急急急急?

... TIME ~~~~~~~~~~~~~~~~~~~~~~~~ eg. A dog weighs 25 kg on a defective scale. Its actual weight is 26.5 kg. In this measurement : a .) absolute error = |25 - 26.5| = 1.5...

分類：科學及數學 > 數學 2016年08月12日

10. ### 拿一包15kg金象米走75m要用多少功?

The work done is zero. The weight acts vertically downward but not horizontally. You walked 75 m in a horizontal direction. Hence, work done = (15g) x (75).cos(90) J = 0...

分類：科學及數學 > 物理學 2017年05月20日