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Physics 106 Homework

# Physics 106 Homework - Physics 106 Homework#1 Submitting...

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Physics 106 Homework #1 Submitting Answers Remember to be careful about units. Implicit multiplication is not understood. Type 3*x, not 3x Defined Constants The following constants can be used by name throughout this assignment: . Problem 1.1 Purpose: This problem is a simple exercise in using Coulomb's Law. Problem with data for try #1 : A charge q1 = +5.58×10 –9 C is located 3.20 m from a charge of –2.80×10 –9 C. Find the magnitude of the electrostatic force exerted by one charge on the other. Additional input values q1 (C): 3.26E-9, 5.57E- 9 Defined symbols: q1 first charge in C q2 second charge in C r distance between charges in meters The answer is F magnitude of the force in N Hints: Remember that the magnitude of a vector is always positive. Range of answers: 7.00×10 –9 N to 1.50×10 –8 N . Problem 1.2 Purpose: This problem uses the same concepts as Problem 1.1, but requires you to think of Coulomb's Law in conjunction with Hooke's Law for springs. It's a good problem for MCAT review. Problem with data for try #1 : A molecule of DNA (deoxyribonucleic acid) is 2.17 μm long. The ends of the molecule become singly ionized negative on one end, positive on the other. The helical molecule acts like a spring and compresses upon becoming charged. If the molecule compresses 1.10 percent, determine the effective spring constant of the molecule. Be

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sure to put everything into SI units, so the answer is in SI units! Additional input values pct: 1.1, 1 Defined symbols: pct percentage compression of the molecule d length of the DNA molecule The answer is k the effective spring constant of the molecule Hints: The Coulomb force between the charges at the ends of the molecule causes the molecule to compress. The Spring force is F =– kx where k is the spring constant and x is the amount of compression. Note that when the molecule compresses, the distance between the charges is no longer 2.17 μm.
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Physics 106 Homework - Physics 106 Homework#1 Submitting...

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