In Gulliver's Travels, Jonathan Swift wrote about a country where astronomers had found that Mars had two moons. (The moons of Mars were unknown at that time)
"They have likewise discovered two lesser stars, or satellites, which revolve about Mars, whereof the innermost is distant from the center of the primary planet exactly three of his diameters, and the outermost five; the former revolves in the space of ten hours, and the latter in twenty-one and a half..." If this information were correct, what would the mass of Mars be? The radius of Mars is 3,393,500 m and G = 6.67 x 10-11 N•m2/kg2. A) 3.86 × 1024 kg
B) 6.45 × 1023 kg
C) 5.67 × 1021 kg
D) 2.83 × 1021 kg
E) 4.78 × 1020 kg
A
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Fill in the blank(s) with the appropriate word(s).
What determines how rapidly a star burns up its fuel?
A. the temperature in its core B. its mass C. its luminosity D. the pressure in its core E. All of these choices are correct.
A 350-g air track cart on a horizontal air track is attached to a string that goes over a frictionless pulley with a moment of inertia of 6.00 × 10-6 kg ? m2 and a radius of 1.35 cm
If the string is pulled vertically downward by a force of 2.50 N, (a) what is the magnitude of the acceleration of the cart, and (b) what is the tension in the horizontal string between the pulley and the cart?
What is the impedance of an AC series circuit that is constructed of a 12.5-? resistor along with 13.6-? inductive reactance and 3.43-? capacitive reactance?
a. 29.5 ? b. 22.7 ? c. 18.2 ? d. 16.1 ? e. 3.36 ?