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Redlands PHYS 231 - Study Notes

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RW 12b Name:_______________________About this assignmentopen and closed systems. Study Section 5.6 (p. 175-180).1. Review of the woman, the barbell, and the Earth (Section 5.6.1 in the textbook).Starting from rest, a woman lifts a barbell with a constant force F through a distance h, at which point she is still lifting, and the barbell has acquired a speed v. Let Ewoman stand for the following energy terms associated with the woman:Ewoman = Echemical,woman + Kwoman (moving arms etc.) + Ugrav,woman+Earth + Ethermal,womanThe change in the kinetic energy of the barbell is ½ mv2 - 0 = ½ mv2.The general statement of the energy principle is Esys = Wext. We'll consider terms on the left side of the equation (the Esys side, changes in the energy inside the system) and terms on the right side (the Wext side, energy inputs from the surroundings).I. System: Woman + barbell + EarthFor the system consisting of the woman, the barbell, and the Earth, which of the following terms belong on the left side of the energy equation (the Esys side)?a. ½ mv2b. – ½ mv2c. none of these terms (left side is 0)d. Ewomane. –Fhf. –mghg. Fhh. +mghFor the system consisting of the woman, the barbell, and the Earth, which of the following terms belong on the right side of the energy equation (the Wext side)?a. none of these terms (right side is 0)b. –mghc. +mghd. –Fhe. Ewomanf. ½ mv2g. – ½ mv2h. FhII. System: barbell onlyFor the system consisting of the barbell only, which of the following terms belong on the left sideof the energy equation (the Esys side)?a. -Fhb. ½ mv2c. - ½ mv2d. none of these terms (left side is 0)e. Ewomanf. Fhg. +mghh. –mghFor the system consisting of the barbell only, which of the following terms belong on the right side of the energy equation (the Wext side)?a. Fhb. - ½ mv2c. –Fhd. none of these terms (right side is 0)e. ½ mv2f. +mghg. Ewomanh. –mghIII. System: barbell + EarthFor the system consisting of the barbell and the Earth, which of the following terms belong on the left side of the energy equation (the Esys side)?a. Ewomanb. –mghc. none of these terms (left side is 0)d. - ½ mv2e. ½ mv2f. +mghg. –Fhh. FhFor the system consisting of the barbell and the Earth, which of the following terms belong on the right side of the energy equation (the Wext side)?a. - ½ mv2b. none of these terms (right side is 0)c. Ewomand. +mghe. Fhf. –mghg. –Fhh. ½ mv2Electric forces; nuclear reactions with change of rest mass. Sections 4.6-4.8 (p. 140-148).1. Two protons are a distance 4 ×10–9 m apart. What is the electric potential energy of the system consisting of the two protons?Uel = _______________ joulesIf the two protons move closer together, will the electric potential energy of the system increase, decrease, or remain the same?a. increaseb. decreasec. remain the sameA proton and an electron are a distance 4 ×10–9 m apart. What is the electric potential energy of the system consisting of the proton and the electron?Uel = _________________ joulesIf the proton and the electron move closer together, will the electric potential energy of the system increase, decrease, or remain the same?a. increaseb. decreasec. remain the sameWhich of the following statements are true?a. If any two charged particles are released from rest, they will spontaneously move in the direction in which the potential energy of the system will be decreased.b. In some situations charged particles released from rest would move in a direction thatincreases electric potential energy, but not in other situations.c. If released from rest two protons would move closer together, increasing the potentialenergy of the system.2. Two protons that are very far apart are hurled straight at each other, each with an initial kineticenergy of 0.19 MeV, where 1 mega electron volt is equal to 106 ×(1.6×10-19) joules. What is the separation of the protons from each other when they momentarily come to a stop due to their electric repulsion?separation = _____________________


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