The standard kilogram is a platinum-iridium cylinder 39 mm in height and 39 mm in diameter. What is the density of the material?
21475 kg/m3
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Which of the following objects may have organic particles on its surface as a result of the interaction of sunlight with methane in its upper atmosphere?
a. Io b. Titan c. Mimas d. Ganymede e. Callisto
________ was the first person to measure the circumference of Earth.
A. Galileo B. Aristarchus C. Eratosthenes D. Ptolemy E. Copernicus
As viewed from above Earth's North Pole, all of the planets orbit the Sun in the same (counterclockwise) direction
Indicate whether the statement is true or false
You want to swim straight across a river that is wide. You find that you can do this if you swim at an angle of ? = 28° from the upstream direction at a constant rate of relative to the water
At what rate does the river flow? The angle ? is measured from the river bank (directly upstream is while directly across the river is A) 1.3 m/s B) 0.70 m/s C) 1.6 m/s D) 1.8 m/s