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carl1

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About carl1

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  1. Compound B is acetylcholine, a neurotransmitter found in the human body. It binds to receptors, leading to nerve stimulation. COMPOUND B CH3 O | || H3C- N+- CH2- CH2- O-C- CH3 | CH3 (in case the thread does not show correctly, the CH3 with the single line underneath places above the N+, the O with the two || below it places above the C and the CH3 with the line above it places below the N+) (i) Name two types of interaction, other than van der Waals or hydrophobic interactions, by which compound B could bind to the receptors. (ii) Identify two different types of group or atoms that could be involved in each of the interactions described in part ©(i). (iii) Give examples of the types of functional groups which will have to be present in the receptor sites in order for the two types of binding interaction to take place. please help due in tomorrow.
  2. -------------------------------------------------------------------------------- the maximum kinetic energy of a photoelectron, Ek,max , to the smallest amount of energy, E0, needed to free an electron from the metal, and the energy, Eph , of the incident photons of light: Ek,max = Eph – E0 In addition, you know from Equation 10.1 that Eph = hf where h is the Planck constant and f is the frequency of the incident light. Which one of the following graphs represents the relationship between Ek,max and f ? attachment of graphs is attached. thanks trigger. Attached Thumbnails
  3. Hi all, Nearly all of the energy used on earth comes originally from the sun, and that solar radiation is intercepted at 1370 Wm^-^2 at the top of the atomsphere, and that 49%of this radiation is absorbed by the earths surface. If a shallow dish containing ice or warte, placed on the earth surface, absorbs the same the same fraction of solar radiation as the surface itself, at what rate is energy absorbed from the sun by such a container of surface 0.039m^2 ? This is how i worked it out, .49*1370 = watts per square meter absorbed Multiply that by the dish area. So is the correct answer 67130 Wm^2 thanks carl1
  4. the maximum kinetic energy of a photoelectron, Ek,max , to the smallest amount of energy, E0, needed to free an electron from the metal, and the energy, Eph , of the incident photons of light: Ek,max = Eph – E0 In addition, you know that Eph = hf where h is the Planck constant and f is the frequency of the incident light. Which one of the following graphs represents the relationship between Ek,max and f ? please help answer due tomorrow. Carl1.
  5. Hi all, how would you find the kinetic energy of a sparrow of 28.6 g moving at a speed of 13 M S^-^1. Thanx.
  6. hi all can anyone please tell me, What energy tfransfers are used to operate a wind-up radio. thanx carl1
  7. hi all, can anyone please help. Im stuck on calculating the volume - If you had a mass of 1.028 x 10^26 kg and density of 1.61 x 10^3 kg m-3. I have come up with what i think is the answer that is 0.63850931677m^3 If this is correct, then how do i write this answer to the appropriate number of significant figures. Many thanks Carl1
  8. Hi all, my daughter hsa been asked to solve the following The planet Neptune has a mass of 1.028 × 1026 kg and a density of 1.61 × 103 kg m–3. Use this information to calculate the volume of Neptune. Volume, , is given by m volume= --- p where (m) is mass and (p) is density. You should give your answer in scientific notation to the appropriate number of significant figures and with the correct SI units. Many thanks carl1
  9. -------------------------------------------------------------------------------- Hi all, a richter scale is based on powers of ten, which means that an increase of one unit on the scale implies a tenfold increase in ground motion. ie: a mag 2 earthquake produces 10 times more maximum ground motion than a mag 1 quake. A mag 3 quake produces 10 times more again, which is 10 x 10 =100 times greater ground motion than a mag 1 quake. so my question is:How many times greater ground motion of a mag 7 compared to a mag 5. Would i be in thinking the anwser would be 200 or would it just be a 2. (ie: the difference being a mag 2) thanks carl1
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