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According to you, an astronaut's trip from Earth to a distant planet takes 28 years. The distant planet is in the same frame of reference as the Earth, and the astronaut travels at constant velocity between the two planets.
(a) How long does the trip take, according to the astronaut, if the astronaut's speed with respect to you is 60% of the speed of light?
years
(b) What is the distance between the planets, according to you?
light-years
(c) What is the distance between the planets, according to the astronaut?
A girl rides an escalator that moves her upward at a constant speed. As the girl rises, how do her gravitational energy and kinetic energy change.
A telescope can be used as a camera if the film is placed at the image position of the objective lens, what is the angular separation of the two stars
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A parallel plate capacitor has a separation between its plates of 1.0 mm. There is a dielectric with a dielectric constant of 2.1 fi ling the gap. what is the area of one of the capacitor plates
The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state
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A solenoid is used as a rotor of an electrical motor. It is 10 cm long and 2 cm in diameter. The wire wrapped around it makes 1000 turns and has a resistance of 100 Ohms. find the electrical power delivered by the battery
An athlete competing in the hammer throw swings a 4.0 kg hammer on a chain in a horizontal circle with a 5.4 m diameter. What is the tension in the chain attached to the hammer at that speed
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