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  1. I am satisfied with the lab called Prime Testing Group Ltd. They are professional for different tests and they have good customer service. Also, their prices are better than other...

  2. 1. Use conservation of mechanical energy. When the elevator comes to a complete stop, (1/2)x(2000)x(4^2) + 2000g x 2 = 17000 x2 + (1/2)k.(2^2) where k is the spring constant, and take g to be 10 m/s^2 solve for k gives k = 7000 N/m When the elevator is 1 m below the contact point...

  3. ... in the laboratory,accidents can easily occur. 5.We should wear safety gogglest o protect our eyes when heating a beaker of water 6...

  4. ... is just 1 mA. EHT supplies often have a further ‘ safety resistor’ (e.g. 10 MΩ) to reduce the maximum current still further. ...

  5. (a) Speed of survivor before striking the net = square-root[2g x 15] m/s = 17.32 m/s where g is the acceleration due to gravity, taken to be 10 m/s^2 Use euation: v^2 = u^2 + 2a.s with v = 0 m/s, u = 17.32 m/s, s = 1 m, a =? hence, 0 = 17.32^2 + 2.(a).(1) a = -150 m/s^2 (b) Lossen the net...

  6. 1. If the second peak was higher than the first peak, there would be an increase in potential energy. Should the kinetic energy at the first peak be not high enough, the roller coaster might not be able to climb up the second peak. 2. There is frictional force...

  7. It is quite easy=] First,you need to calculate the vertical direction: Sy=(1/2)at^2 10=(1/2)gt^2 10=(1/2)X10Xt^2 t^2=2 t=1.4142s In the horizontal direction: Sx=ut Sx=25X1.4142 Sx=35.355m Sx=35m Thus,the answer is...

  8. ... (機電工程署) is the legal authority in controlling power distribution safety in Hong Kong. Your Estate Management ...

  9. ... keeps the potential of the wire at zero volt. Apart from safety reason, this also helps to maximize the voltage supplied by the live wire...

  10. 1. no picture or figure is shown. 2. Flammable A Explosive C,D Harmful B, D Toxic E, B 3a step3 b When mixing the solutions, shake the test slightly. While...