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2. Free-fall time - Wikipedia

   en.wikipedia.org/wiki/Free-fall_time

   Here we have estimated the numerical value for the free-fall time as roughly 35 minutes for a body of mean density 1 g/cm 3. Comparison [ edit ] For an object falling from infinity in a capture orbit , the time it takes from a given position to fall to the central point mass is the same as the free-fall time, except for a constant 4 3 π ≈ 0. ...

3. Sleep Calculator: How Much Sleep Do You Need? - Healthline

   www.healthline.com/health/sleep/sleep-calculator

   Sleep guidelines by age. Birth to 3 months: 14 to 17 hours. 4 to 11 months: 12 to 16 hours. 1 to 2 years: 11 to 14 hours. 3 to 5 years: 10 to 13 hours. 6 to 12 years: 9 to 12 hours. 13 to 18 years ...

4. Diet Tool: Calories Burned Calculator for Common Exercises ...

   www.webmd.com/.../healthtool-exercise-calculator

   WebMD Fit-O-Meter: The diet tool that is a calories burned calculator and counter for your common exercises and activities.

5. Average 5K Time: By Age, Sex, and Tips to Get Faster - Healthline

   www.healthline.com/.../average-5k-time

   The average 5K time depends on a few factors, including age, sex, and fitness level. But, you can expect to finish a 5K in roughly 30 to 40 minutes.

6. Calories Burned Walking: 1 Mile, 1 Hour, Calculator - Healthline

   www.healthline.com/health/calories-burned-walking

   The equation is: calories burned = BMR x METs/24 x hour. For example: A 35-year-old woman who weighs 150 pounds, is 5 feet 5 inches tall (BMR = 1,437), and walks for 60 minutes at 3.0 mph (3.5 ...

7. Stepped reckoner - Wikipedia

   en.wikipedia.org/wiki/Stepped_reckoner

   The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz around 16 and completed in 1694. [1] The name comes from the translation of the German term for its operating mechanism, Staffelwalze, meaning "stepped drum". It was the first calculator that could perform all ...

8. Clock angle problem - Wikipedia

   en.wikipedia.org/wiki/Clock_angle_problem

   Clock angle problems relate two different measurements: angles and time. The angle is typically measured in degrees from the mark of number 12 clockwise. The time is usually based on a 12-hour clock . A method to solve such problems is to consider the rate of change of the angle in degrees per minute. The hour hand of a normal 12-hour analogue ...

9. What Is Sleep Latency Testing? Method, Use, and Results - WebMD

   www.webmd.com/sleep-disorders/what-to-know-sleep...

   Sleep latency, or sleep onset latency, is the time it takes for you to go from being fully awake to sleeping. Sleep latency and the time it takes to reach rapid eye movement sleep (REM sleep) are ...