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C 18 flashcards
Fichas del conjunto (40)
- 1Define gravitational field.
- 2Define gravitational field strength.
- 3Define gravitational field lines.
- 4Define radial field.
- 5Define a point mass.
- 6Define a uniform gravitational field.
- 7Define newton’s law of gravitationNewton’s law of gravitaion
- 8Define the gravitational constant.
- 9Define Kepler’s 1st law.
- 10Define an ellipse.
- 11Define eccentricity.
- 12Define an aphelion.
- 13Define a perihelion.
- 14Define Kepler’s 2nd law.
- 15Define Kepler’s 3rd law,.
- 16Define the astronomical unit.
- 17Define geostationary sattelites.
- 18Define gravitational potential.
- 19Define escape velocity.
- 20Give an equation for gravitational field strengthGravitational field strength, g = gravitational force F / mass m
- 21Which direction does gravitational force actTowards the center of mass of the object producing the field
- 22What is the force between 2 point masses directly proportional to1/radius^2
Mm, the two masses - 23Give an equation for gravitational forceF = - GMm / r^2
- 24Why is there a - in the equation for gravitational forceTo show that it is an attractive force
- 25Give an equation for gravitational field strength involving rG = - GM / r^2
- 26What does the - mean in the equation for gThat the gore goth at that point is in the opposite direction to the displacement r from the gentle of mass, gravitational fields are attractive
- 27What is g directly proportional toM
1/r^2 - 28What does the graph of g against 1/r^2 look like, and g agianst r
- 29Why can most orbits be modeled as circularBecause they have a low eccentricity
- 30At what point in the orbit is a planet fastest and slowestFastest closest to the sun, slowest further away from the sun
- 31Why can we only rarely see cometsBecause their orbits are highly elliptical, so we see them when they are most close to th sun, but not at any other point of their journey
- 32Give an equation involving centripetal force and gravitational force on a planetMv^2 / r = GMm/r^2
- 33Give an equation for speed involving GV = square root of GM/r
- 34Give 5 uses of satellitesCommunications like phones, tv or radio, military reconnaissance, scientific research like monitoring crops, weather and climate monitoring, global positioning
- 35What is a polar orbitAn orbit which circles the poles
- 36What are the three requirements for being a geostationary satelliteBe in orbit over the earth’s equator, have an orbital period of 24 hours and rotate the same direction as the eath
- 37What does gravitational potential depend onThe distance r from the point mass producing the gravitational field to that point and the mass of the point mass
- 38What is gravitational potential directly poor proportional toMass and 1/r
- 39Give an equation. For gravitational potentialGrav pot = - GM/ r
- 40—
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- Fichas sobre C 18 flashcards, creado por lizabeth rawson el 10/03/2022.
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- lizabeth rawson
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