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How far away is an object whose echo takes 9 seconds to return?
About 1548 metres, which is roughly one US mile. But it varies with temperature, humidity, and height above sea level.
Name a physical characteristic that police ask witnesses to describe?
height hair weight eyes scars or tattoos skin age
What happens when a penny is dropped from a height of 20 meters?
It falls down. When it reaches a hard bottom it is likely to bounce whereas if it hits water it will sink.
How many fluid oz should a healthy male ejaculate?
It varies from day to day, greatly depending on the frequency and your age. Usually it's about one ounce.
What is the length of the shadow at midday?
It's determined by the height (angle above the horizon) of the Sun, and the physical height of the object throwing the shadow. The height of the Sun at midday is 90 degrees minus the latitude plus the Sun's declination of the day, which varies by up to ±23.5 degrees through the year. The length of the shadow is the height of the object divided by the tangent of the Sun's height. Example, a 6 ft object at 50 degrees north on June 21: height of the object is 6 ft, divided by tan(90 - 50 + 23.5) so the shadow has a length of 3 ft.
