Recent content by jinhuit95

  1. J

    Naming a Compound: Understanding C(CH3)3 and Its Naming Conventions

    Hi, I need help in naming this compound. Firstly, can someone explain to me what it means my C(CH3)3. Does it means its a C connected to 3 methyl groups? I would name it 2-bromo-4-dimethyl-6-trimethyloctane but apparently the answer i was given is : 7-bromo-3-ethyl-2,2,5,5-tetramethyloctane or...
  2. J

    Solenoid & Lenz's Law: Choosing Option B

    With respect to the north pole there will be an induced upwards flux right by lenzs law right? Since both induced flux are in the same direction, wouldn't the currents be in the same direction??
  3. J

    Solenoid & Lenz's Law: Choosing Option B

    Why are the direction of the currents different??
  4. J

    Solenoid & Lenz's Law: Choosing Option B

    I know that the answer will not be a or c due to effects of gravity. But I can't decide between b and d. I chose b because of lenzs law. I thought that since the south pole enter first, there will be an increasing flux upwards, coil opposes this by inducing an magnetic flux downwards. When it...
  5. J

    Probabilities of archers A and B hitting the bull's eye

    I'm sorry but what's this? '1 + a2 + a3 + ... = 1/(1-a) for |a| < 1'
  6. J

    Probabilities of archers A and B hitting the bull's eye

    the problem is, if he hits on the first attempt that's 1/6. so If i go on, it will be 1/6 + ( 5/6 * 4/5 * 5/6 * 4/5 * 5/6 * 4/5...) I have no idea when to stop. Moreover, the product of probability he misses will be come smaller and smaller and that number + 1/6 will not give me half i think.
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    Probabilities of archers A and B hitting the bull's eye

    Homework Statement Two archers A and B take turns to shoot, with archer A taking the first shot. The probabilities of archers A and B hitting the bull's eye is 1/6 and 1/5 respectively. Show that the probability of archer A hitting the bull's eye first is 1/2. Homework Equations...
  8. J

    How Close Can a Helium Nucleus Get to a Gold Nucleus?

    Will the speed eventually reach zero?
  9. J

    How Close Can a Helium Nucleus Get to a Gold Nucleus?

    Because they are talking about nucleus only? but is my way of doing correct?? cause I'm not sure how to approach it!
  10. J

    How Close Can a Helium Nucleus Get to a Gold Nucleus?

    A helium nucleus of mass 4u and consisting of 2 protons are traveling at the speed of 7x10^6 m/s strikes a gold nucleus of mass 197u and 79 protons. by considering only the electrostatic repulsion, what is the closest possible distance of approach between them? I was considering to use...
  11. J

    Enthelpy Change of Combustion.

    Homework Statement When 1.00g of ethanol was burned under a container of water, it was found that 100g of water was heated from, 15°C to 65°C, The process was known to be only 70% efficient. Calculate the enthalpy change of combustion of ethanol taking specific heat capacity of water to be...
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