Holly intends to swim to a point straight across a 100. m wide river that flows at 1.2 m/s. If she can swim 2.5 m/s in still water, at what angle must she swim upstream to achieve her goal?
What will be an ideal response?
She must angle 29.° upstream.
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The signs of the zodiac are important to astronomy as they influence the seasons on Earth
Indicate whether the statement is true or false
Which of the following best describes the property of the period of orbital revolution for an Earth satellite?
a. greater when the orbital radius is smaller b. greater when the orbital radius is larger c. independent of the orbital radius d. determined mainly by the satellite's mass
A student constructs an astronomical telescope with a magnification of 10. If the telescope has an objective lens of focal length 0.50 m, what is the resulting length of the telescope?
A) 53 cm B) 55 cm C) 60 cm D) 75 cm
Suppose that a lone asteroid happens to be passing Jupiter on an unbound orbit (well above Jupiter's atmosphere and far from all of Jupiter's moons.) Which of the following statements would be true?
A) The asteroid's orbit around Jupiter would not change, and it would go out on the same unbound orbit that it came in on. B) Jupiter's gravity would suck in the asteroid, causing it to crash into Jupiter. C) Jupiter's gravity would capture the asteroid, making it a new moon of Jupiter. D) There is no way to predict what would happen.