What was Tycho Brahe's contribution to astronomy?
a. He proved that Earth rotates on its own axis and revolves around the Sun
b. He designed the three laws of planetary motion.
c. He discovered satellites around Jupiter, which proved Earth could move and keep its satellite.
d. He described why each of the planets moved in uniform circular motion.
e. He compiled detailed observations of the positions of the Sun, Moon, and planets over a period of 20 years.
e
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An air-track cart is attached to a spring and completes one oscillation every 5.67 s. At t = 0 s the cart is released at a distance of 0.250 m from its equilibrium position. What is the position of the cart when t = 29.6 s?
A) x = 0.0460 m B) x = 0.210 m C) x = 0.218 m D) x = 0.342 m E) x = -0.218 m
A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. After moving upwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest
a. 150 lb b. 160 lb c. 170 lb d. none of the above
One reason the planets near the Sun are composed mainly of rock and iron may be that
A. the Sun is made mostly of iron, so the planets nearest it are formed of iron. B. the Sun's heat made it difficult for ices and gases to condense near it. C. the Sun's gravity sucked in iron and heavy material and the lighter materials floated farther away. D. the Sun's magnetic field attracted all the iron into the region around the Sun.
A steam turbine at an electric power plant delivers 4 500 kW of power to an electrical generator which converts 94% of this mechanical energy into electrical energy. What is the current delivered by the generator if it delivers at 3 500 V?
a. 7.3E+2 A b. 1.4E+3 A c. 1.2E+3 A d. 1.1E+3 A e. 8.3E+2 A