Question

Question 5 Part A Biological macromolecules such as proteins may be positively, negatively, or neutrally charged depending on what amino acids are present. Some parts of a macromolecule may be positively charged while others are negatively charged, and this can affect the conformation - the shape of the macromolecule. Changes in the conformation may affect the function of a macromolecule. Two charged macromolecules (labelled 1 and 2) have charges q1 =+3.20 * 10-19 C and q2 =+12.8 10-19 C. They are separated by a distance of 60 nm. a. How many elementary charges are missing from each macromolecule? Explain your reasoning. b. What is the magnitude of the electrostatic force on macromolecule 1 from macromolecule 2? C. Draw a diagram showing the direction of the force on macromolecule 1 due to macromolecule 2. Explain why the force is in the direction you determined. d. Draw a diagram showing the electric field surrounding these charged macromolecules. Make sure to include arrows indicating the direction of the field. Part B A person suffering a heart-related medical emergency may have an irregular heartbeat, affecting the flow of blood, and as a consequence, their supply of oxygen. UQ has 28 automatic external defibrillator stations around campus. These devices can restore a regular heartbeat to a person in a medical emergency. A portable defibrillator containing an 85 uF capacitor is charged up to a potential difference of 8000 V. a. How much energy is stored in the device? What kind of energy is this stored energy? b. How much positive charge is on one plate of the capacitor when it is fully charged? What is the net charge on both plates? Explain why this is the case.

Answer 1

(A) q = 3.2x10-19 q. = 12.8x10-14 d = 60 ums) 6x10 -8 m (a) using q = n, e 3.2X1029 = n, x16x10-ye n,=2 2 electrons are missing. -ne Similarly, qz e 12.8x16= n₂x1.641577 15) Fir n₂= 8 ::8 elections are missing. Kq 192 9x10B. 2x 128 38 (6x108) 2 - 11.024X10-12 IN d? tiot Find q. The direction is so because both machomolecules are positively Charged, that they would repel each other

2 of elective energy ) d] & - Cov) = 85x10x8ooo (B) E=1 clav ²) a) = } V8SX105°C 8000) 2720 Joules (It is stored in the form 6. = [0.68c of both plates Net Charge 0.68 -0.68 с