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Lecture10 - Exam#1 Wednesday February 15 Which situation(s...

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Exam #1 Wednesday, February 15
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Which situation(s) does NOT describe an acceleration: a) a car traveling with constant speed on a straight road. b) a car traveling with constant speed around a bend. c) a planet traveling in its orbit around the Sun. d) a car decreasing speed on a straight road. e) an electron traveling around a nucleus.
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Which situation(s) does NOT describe an acceleration: a) a car traveling with constant speed on a straight road. b) a car traveling with constant speed around a bend. c) a planet traveling in its orbit around the Sun. d) a car decreasing speed on a straight road. e) an electron traveling around a nucleus.
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You are an astronaut taking a spacewalk to fix your spacecraft with a hammer. Your lifeline breaks and the jets on your back pack are out of fuel. To return safely to your spacecraft (without the help of someone else), you should a) throw the hammer at the space ship to get someone's attention. b) throw the hammer away from the space ship. c) use a swimming motion with your arms. d) kiss your ship good bye.
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You are an astronaut taking a spacewalk to fix your spacecraft with a hammer. Your lifeline breaks and the jets on your back pack are out of fuel. To return safely to your spacecraft (without the help of someone else), you should a) throw the hammer at the space ship to get someone's attention. b) throw the hammer away from the space ship. c) use a swimming motion with your arms. d) kiss your ship good bye.
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What are examples in which a force leads to a change in the direction of motion of an object (and hence an acceleration) but not a change in speed? What is the source of the force in these examples?
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Where do “forces” come from?
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Combines the effects of electrical charge and magnetism Can either attract or repel the particles on which it acts. Electromagnetic Force Electrons are kept bound to atoms by the electromagnetic force Friction is a manifestation of the electromagnetic force A planet’s magnetosphere protects it from high energy particles ejected by the sun.
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