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  1. ... example, if the astronaut can exert a force of 500 newtons, he can lift a weight of 500 N on earth, i.e. a mass of 500/g kg = 50 kg if taking g = 10...

  2. ... can be taken and suggest a method to reduce the error involved. a .the weight of a piece of tissue paper The weight of a piece of tissue paper is very...

    分類:科學及數學 > 數學 2011年09月07日

  3. .... If you're constantly losing and regaining weight , a registered dietitian can help you develop sensible eating habits...

  4. ...3. weight = force  因為 non-contact force = force of gravity = weight of an object  so, weight is a non-contact force

  5. 7( a )new weight of copper =300*(1+30%) =390g (b)new weight of...c)orginal weight of alloy =300+450 =750g new weight of the alloy =390+405 =795g percentage change=(795...62000)/62000*100% =10.8%(corr.to 3 sig.fig.) 9( a )new length of the rectangle =15*(1-20%) =15*80...

  6. a . Friction, f = μmgcos20*= (0.25)(20)cos20* = 4.6985 N When...

  7. ( a ) The weight of John is (x+10)kg and Yvonne is (x-5)kg (b...350 3x<=141 x<=47 Therefore, the maximum weight of Mary is 47kg so that the lift will not be overloaded...

    分類:科學及數學 > 數學 2011年09月12日

  8. ( a ) the weight component along the plane = 0.5g.sin(30) N = 2.5 N (b) acceleration = force/mass = 2.5/0.5 m/s2 = 5m/s2 (c) u =0 m/s, a = 5 m/s2, s=1m, t=? use s=ut+(1/2).at^2 1 = (1/2)(5)t^2 thus t = 0.63 s (d...

  9. ...0.25 kg Weight of cat = 12x + 0.3 = 12(0.25) + 0.3 = 3 + 0.3 = 3.3 kg ( a ) Weight of the rat is 0.25 kg (b) Weight of the cat is 3.3 kg

  10. ...題目是經過修正的。請小心留意題目是否一致。〕 Question The weight of a cat is 0.3 kg more than 12 times that of a rat, while the weight of...

    分類:科學及數學 > 數學 2013年10月21日