Physicshard · Past Paper
If the Earth's radius shrinks by 1% while its mass remains constant, the value of 'g' on its surface would:
ADecrease by 1%
BIncrease by 1%
CIncrease by 2%
DDecrease by 2%
✓ Correct Answer: C — Increase by 2%
Using the relation g = GM/R^2, for small changes, dg/g = -2dR/R. A 1% decrease in R leads to a 2% increase in g.
Share this question
More from Physics
- A car moving at 40 km/h can be stopped by brakes in 2m. If the same car moves at 80 km/h, the stopping distance is:
- A car decreases its speed from 80 km/h to 60 km/h in 5 seconds. What is the retardation?
- What is the relation between velocity (v), frequency (f) and wavelength (λ)?
- The potential energy of a system increases if work is done:
- A metal cube of side 10 cm and density 8000 kg/m³ is suspended in water. The upthrust is: