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# 33_new - Ch3-HW1 florin(56950 1 This print-out should have...

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Ch3-HW1 florin (56950) 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Problem @22: calculate the di ff erence in the magnitudes of the fields, not the forces. 001 (part 1 of 4) 10.0 points Each part of this problem will state an ex- ample of objects interacting via some force. Choose the fundamental interaction that is responsible in each case. A neutron outside a nucleus decays into a proton, electron, and antineutrino. 1. Strong 2. Gravitational 3. Weak correct 4. Electromagnetic Explanation: Notice the presence of an antineutrino in this decay. Neutrinos (and their antiparticle partners) only interact via the weak force, so this must be a weak interaction. 002 (part 2 of 4) 10.0 points Protons and neutrons attract each other in a nucleus. 1. Gravitational 2. Strong correct 3. Weak 4. Electromagnetic Explanation: The force that holds the nucleus together must be strong enough to overcome the repul- sion between protons due to the electromag- netic force. This is a strong interaction. 003 (part 3 of 4) 10.0 points The Earth pulls on the Moon. 1. Gravitational correct 2. Weak 3. Electromagnetic 4. Strong Explanation: This is a gravitational interaction, in which massive bodies attract each other. 004 (part 4 of 4) 10.0 points Protons in a nucleus repel each other. 1. Gravitational 2. Weak 3. Electromagnetic correct 4. Strong Explanation: This is an example of an electromagnetic in-teraction, in which particles with like charges repel. 005 (part 1 of 2) 10.0 points The mass of the Sun is 2 × 10 30 kg, and the mass of Mercury is 3.3 × 10 23 kg. The distance from the Sun to Mercury is 4.8 × 10 10 m. First, calculate the magnitude of the gravi- tational force exerted by the Sun on Mercury. Use G = 6.67 × 10 11 m 3 . kg · s 2 Correct answer: 1.91068 × 10 22 N. Explanation: The magnitude of the gravitational force between two objects is given by F ~ gr = Gm 1 m 2 = Gm 1 m 2 . 2 2 r r We just need to plug in the given constants to find the answer: F ~ gr = Gm 1 2 m 2 r

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