William Herschel's attempt to map our Galaxy was based on ________ in different directions in space
Fill in the blank(s) with correct word
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A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s north, and the total acceleration of the car is 2.5 m/s2 37° south of west. Which of the following is correct?
a. R = 0.40 km, and the car's speed is decreasing. b. R = 0.20 km, and the car's speed is decreasing. c. R = 0.20 km, and the car's speed is increasing. d. R = 0.16 km, and the car's speed is increasing. e. R = 0.16 km, and the car's speed is decreasing.
The local solar time at 135°W is 12:00 noon. What is the longitude of an observer who sees the full moon on her meridian at this time?
a. 45°E b. –45°E c. 135°E d. 135°W e. None of the above
Helioseismology is the study of the differential rotation and magnetic field of the Sun
a. True b. False Indicate whether the statement is true or false
When a jet airplane takes off, how is momentum conserved?
a. Momentum is conserved because the jet of hot air pushes on the atmosphere around it. b. Momentum is conserved because the air rushing out of the jet engine is moving out in the direction opposite to the plane's movement. c. Momentum is not conserved because the jet was motionless and is now moving. d. Momentum is conserved because molecules in the air move on average in all directions. e. Momentum is conserved because the jet is collecting oxygen from the atmosphere.