The earth is a sphere with a radius of R= 6,367,445 m. A sidereal day is 86,164.09 sec. A satellite orbits the earth in circular orbits once in exactly half a sidereal day. Gravity at an altitude of h meters is equal to g(h)=9.81 x (R/(R+h))^2 m/s^2. What is the altitude of the satellite?
Casio's taken the wraps off the latest wristwatch in its adventurous Protrek line, the PRX-2000T, and the thin little thing is basically a streamlined weather station for your wrist.
The PRX-2000T weighs in at a scant 105 grams, and is a mere 11.3mm thick. Crammed in that tiny space is a triple...
Hi, I am going to USA in August this year. I live in Australia. I want to hike up Mt Shasta. The altitude is over 14,000 feet up there...back home highest I can get to is about 300 feet!
Wanting to know how can I increase my lung fitness to do the hike. I am reasonably fit at the moment. I...