If the radius of the Earth is R, what is the gravitational acceleration at a hei

Practice Questions

Q1
If the radius of the Earth is R, what is the gravitational acceleration at a height R above the Earth's surface?
  1. g/4
  2. g/2
  3. g
  4. g/8

Questions & Step-by-Step Solutions

If the radius of the Earth is R, what is the gravitational acceleration at a height R above the Earth's surface?
  • Step 1: Understand that 'g' is the gravitational acceleration at the Earth's surface.
  • Step 2: Know that the radius of the Earth is represented as 'R'.
  • Step 3: Recognize that 'h' is the height above the Earth's surface, which in this case is equal to 'R'.
  • Step 4: Write down the formula for gravitational acceleration at a height 'h': g' = g(R/(R+h))^2.
  • Step 5: Substitute 'h' with 'R' in the formula: g' = g(R/(R+R))^2.
  • Step 6: Simplify the expression: g' = g(R/(2R))^2.
  • Step 7: Further simplify: g' = g(1/2)^2.
  • Step 8: Calculate (1/2)^2, which equals 1/4.
  • Step 9: Therefore, g' = g/4, meaning the gravitational acceleration at a height R above the Earth's surface is g/4.
  • Gravitational Acceleration – Understanding how gravitational acceleration changes with distance from the center of the Earth.
  • Height Above Earth's Surface – Calculating gravitational effects at a specific height above the Earth's surface.
  • Inverse Square Law – Applying the inverse square law to gravitational force and acceleration.
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