A new planet is discovered orbiting a distant star. Observations have confirmed that the planet has a circular orbit with a radius of 18 AU and takes 109 days to orbit the star. Determine the mass of the star.
AU stands for "astronomical unit". It is the average distance between Earth & the Sun. 1 AU ≈ 1.496 × 1011 m.
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Physics, 21.06.2019 17:00
Which of the following is considered to be a vector? a. temperature b. velocity c. time d. mass
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What is the scientific definition of energy that relates to work
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Physics, 22.06.2019 07:50
The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.
Answers: 2
Physics, 22.06.2019 16:30
Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?
Answers: 2
A new planet is discovered orbiting a distant star. Observations have confirmed that the planet has...
Mathematics, 14.04.2020 17:59
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