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  1. ....jpg We can see that, as the wave travels by 1 cm, the leading edge has risen up uniformly by 1 cm, i.e. in 0.5 seconds. So the velocity of the leading ...

  2. (a) There is energy spent on heating up the kettle itself. Hence, the energy ...always less than the energy produced by the kettle, leading to an efficiency lower than 100%. (b) Energy...

  3. ... both not a safety precaution. A. Sotre too many fuels may lead to explosion and catch fire easily. B. BURN to provide energy will use up oxygen and release carbon dioxide. 3) Yes. Changes form potential energy...

  4. ...the water. Thus lower the amount of the useful heat in heating up the water. This leads to a lower efficiency. 2. (i) The wall insulation of the room (ii) ...

  5. ... feet. 2. The presence of static electricuty in oxygen rich area could lead to a great danger of fire, as there may be sparks occuring in static-electricity build- up area that would make inflammable object easily to catch fire. A well-known...

  6. ...angle between Vo and current I is +45 degrees (Vo leads I) or -45 degrees (Vo lags I), the power ...

  7. ...reaction takes place, both electrodes become coated with solid lead (II) sulfate, and the sulfuric acid is used up . 希望你有用la@@

  8. ...inelastic collision, part of the energy of the ball would be dissipated to heat up the splashing water. This leads to the rebounded wet ball possesses less energy than a dry one/

  9. ...補充: Since input power is fixed, a higher efficiency leads to a higher output power (i.e. the brighter the lamp). Option...

  10. From the equation of radioactivity: dN/dt = - kN where k is a constant We have: N = No e-kt where No is the initial no. of radioactive atoms With half-year = 1.4 x 1010 years, we have: (1.4 x 1010)k = ln 2 k = ln 2/(1.4 x 1010...