Name Date Section At the latitude of Los Angeles (34° N·118\" W) one degree of l
ID: 120611 • Letter: N
Question
Name Date Section At the latitude of Los Angeles (34° N·118" W) one degree of longitude is know 57 miles (91 kilometers). At what velocity is Los Angeles moving with earth rotation? (f) n to be approximately miles per hour km per hour What other latitude would have the same rotation velocity in miles/km per hour as Los Angeles? On Figure 2-1, insert the rotation velocities for the following latitudes: Approximate Length Latitude (N or S) 20° 40° 60° of 1° Longitude (miles) 65 53 4.7 12 (kilometers) (km.p.h.) 85 55.8 19 Ch) Explain why this high velocity rotation motion toward the east is not apparent, or not "felt," by us as rid- ers on the earth? (i) Although places on earth having different latitudes have different rotation velocities in "miles per hour," they, nevertheless, all have the same angular velocity or angular momentum. They would all rotate through 360° in 24 hours and, therefore, have an angular velocity of: degrees per hour This angular velocity is the basis of our time measurement and is the subject of a following exercise. 2-2 Seasons and Axis Tilt The orbital plane of the earth is referred to as the plane ofthe ecliptic. The earth's axis is tilted 23%" from the vertical to the plane of the ecliptic, and it is because of this tilt that the earth experiences seasons. Figure 2-2 represents the plane of the ecliptic from an oblique view with four positions of the earth in orbit to represent the two solstices and the two equinoxes. The sun is in the center of the diagram, and the equator has been drawn in for each earth position. (a) For each of the positions, free hand sketch in the following as they would be visible: (1) Poles (2) Arctic Circle (3) Antarctic Circle (4) Tropic of Cancer (5) Tropic of Capricorn (6) Circle of Ilumination (Always divides the earth into two equal halves-one side illuminated by the sun, the other side not. Take care to position the circle of illumination correctly in reference to the Arctic Circle. Shade in the darkened side of the earth.) b) Sketch in a small additional sphere outline into the orbit to represent today's approximate position of the earth and label the date. Add on the poles and the circle of illumination only.Explanation / Answer
f) circumference of earth at Los angeles= 32760 Km (91 km *360 (Long. of -180 to +180)
time to complete one rotation= 24 hr
Velocity= distance/time = 32760/24 = 1365 km/h.
In miles per hour, velocity= (57*360)/24 = 855 miles/h.
No, the rotatition velocity will change across the latitude. Hence it will not be same all over Los Angeles.
g) Using the same formula, the velocity at
20 deg latitude = 1575km/h ( 978.55 mph)
40 deg latitude= 1275 km/h (792.16 mph)
60 deg latitude = 837 km/h (520.5 mph)
80 deg latitude = 285 km/h (177.09 mph)
h) Earth rotates eastward in prograde motion . Due to the movement of the Earth , the counter force cancel out ,as a result we do not felt anything.
i) Our Earth has three motions. It rotates about its axis, giving us day and night. When it revolves around the sun, gives us two basic weather patterns (cold and hot). It also moves through the Milky Way along with the rest of the Solar System.
Angular speed of Earth (Avg) = "2 radians/86,400 seconds" = 7.27 × 105 rad/s
1 rad/sec=206265 deg/h = 7.27 × 105 * 206265= 14.996 degree per hour.
2-2) fig is not provided in the question.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.