How do we know the total mass of the Milky Way Galaxy that is contained within the Sun's orbital path?
A) by applying Newton's version of Kepler's third law (or the equivalent orbital velocity formula) to the Sun's orbit around the center of the Galaxy
B) by counting the number of stars visible in this region of the galaxy
C) by estimating the amount of gas and dust in between the stars
D) by using the law of conservation of angular momentum to calculate the orbital speeds of nearby stars
A) by applying Newton's version of Kepler's third law (or the equivalent orbital velocity formula) to the Sun's orbit around the center of the Galaxy
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The cooling effect inside a refrigerator is produced by
A) an electric motor that converts electrical energy to internal energy. B) compressing the refrigeration gas. C) vaporizing the refrigeration liquid. D) proper insulation. E) exchanging warmer air with colder air.
Explain what an interferometer is and give an example
What will be an ideal response?
For safety in climbing, a mountaineer uses a 50-m long nylon rope that is 1.0 cm in diameter. When supporting a 90-kg climber, the rope elongates 1.6 m. Find the Young's modulus for the rope material
What is the impedance of an ac series circuit with 12.0 ? of resistance, 15.0 ? of inductive reactance, and 10.0 ? of capacitive reactance?
A) 21.9 ? B) 13.0 ? C) 11.6 ? D) 27.7 ?