Recent content by mugen715

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    Measurement of speed using redshift or blueshift

    When the train coming towards me, the wavelength of sound is shorter (higher frequency) but when the train moves away from me it's wavelength is longer (low frequency) The star's H lines is at a shorter wavelength than observed in the laboratory (low frequency is observed), that means the star...
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    Measurement of speed using redshift or blueshift

    The solution on my textbook is 13000m/s toward Earth as the light is blue-shifted I'm able to calculate the magnitude of velocity (13000m/s), but i don't understand why thus is blue-shifted? Since in the lab, the light's wavelength observed is slightly higher than light from Ursa Majoris. So my...
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    Newton's third law a book and table

    Homework Statement Newton's third law of motion is often summarised as 'Every action (force) has an equal and opposite reaction'. A book rests on a table. If the weight of the book is the 'action' force, what is the 'reaction' force? A the pull of the book on the Earth B the pull of...
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    Definition of first law of thermodynamic?

    Homework Statement What is the definition for first law of thermodynamic? I was confused and which one is correct? (a) The CHANGE in internal energy of a closed system is equal to the heat that enters a system and the workdone on the system OR (b)...
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    How Is Binding Energy Calculated in Nuclear Reactions?

    Thank for your reply. Is it true to explain this way, the total energy required to form helium is 28.28MeV meanwhile 17.7mev will be release from the 28.28mev..is this correct?
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    How Is Binding Energy Calculated in Nuclear Reactions?

    Homework Statement This is the question: 2H1 + 3H1 ==> 4He2 + 1n0 +Q Where Q = 17.7 MeV The binding energy per nucleon are given below: 2H1 = 1.12 MeV 1n0 = Null 4He2 = 7.07 MeV " Determine the binding energy per nucleon, in MeV, of tritium...
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    Smoothing effect of full wave rectification

    Homework Statement Hi, I have this question regarding to the smoothing effect of full wave rectification. In order to smooth out the wave. A capacitor is added across a resistor which is connect across a diode bridge. In order to increase the smoothing effect 2nd capacitor can be added...
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    Number of moles of hydrogen gas in the cylinder

    Okk..thanx you very much
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    Number of moles of hydrogen gas in the cylinder

    Homework Statement A gas cylinder contains 4.00 x 10^4 cm^3 of hydrogen at a pressure of 2.50 x 10^7 Pa and a temperature of 290 K. The cylinder is to be used to fill balloons. Each balloon, when filled, contains 7.24 x 10^3 cm^3 of hydrogen at a pressure of 1.85 x 10^5 Pa and a temperature...