Suppose you start at Washington, D.C. (39°N, 77°W), and travel 400 nautical miles due south, then 400 nautical miles due east, then 400 nautical miles due north, and then 400 nautical miles due west. Where will you arrive with respect to Washington, D.C.? That is will you be at the starting point, or north, south, east, or west of the starting point?
At the starting point
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Which of the following statements does not use the term angular size or angular distance correctly?
A) The angular size of the Moon is about 1/2 degree. B) The angular distance between those two houses in the distance is 30°. C) The angular distance between those two bright stars in the sky is about 2 meters. D) The angular size of the Sun is about the same as that of the Moon. E) You can use your outstretched hand to estimate angular sizes and angular distances.
A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s. At this time, the driver suddenly realizes that she must stop the car
If it takes 0.200 s for the driver to apply the brakes, what must be the magnitude of the constant acceleration of the car after the brakes are applied so that the car will come to rest at the stop sign? A) 2.89 m/s2 B) 3.89 m/s2 C) 4.17 m/s2 D) 3.42 m/s2 E) 2.08 m/s2
A planet has 3 moons, all of equal mass. Moon 1 is in a circular orbit of radius r. Moon 2 is in a circular orbit of radius 2r, and moon 3 is in a circular orbit of radius 3r. The ratios of the gravitational force exerted by the planet on each of the moons, 1, 2, and 3 are ________ respectively
1.1:2:3 2.1:1:1 3.1:4:9 4.9:4:1
The range of frequencies that a radio telescope is sensitive to is referred to as its
A) sensitivity B) band C) bandwidth D) bandpass