Wednesday

March 4, 2015

March 4, 2015

Posted by **Mikhail** on Thursday, April 15, 2010 at 12:41am.

How far would you have to drill into the Earth, to reach a point where your weight is reduced by 5.5 ? Approximate the Earth as a uniform sphere.

Express your answer using two significant figures.

- Physics -
**drwls**, Thursday, April 15, 2010 at 1:38amReduced by 5.5 m/s^2 (from 9.8 m/s^2), or by a factor of 5.5?

When you have clarified how much you want to reduce g, drill to a value of R for which M/R^2 (which is proportional to density*R) is reduced by the same factor.

- Physics -
**Mikhail**, Thursday, April 15, 2010 at 2:23amNo by 5.5%.

- Physics -
**drwls**, Thursday, April 15, 2010 at 4:32amTo reduce the value of g by 5.5%, reduce the distance from the center of the Earth by 5.5%. That will mean going down about 350 km.

**Answer this Question**

**Related Questions**

Physics Problem 6.22 - It can be shown that for a uniform sphere the force of ...

Science - It can be shown that for a uniform sphere the force of gravity at a ...

Physics - It can be shown that for a uniform sphere the force of gravity at a ...

Physics - A solid uniform sphere has a mass of 2.0 104 kg and a radius of 1.5 m...

physics - A solid uniform sphere has a mass of 7.0 104 kg and a radius of 1.2 m...

PHYSICS - A 494 kg uniform solid sphere has a radius of 0.390 m. Find the ...

science - a sphere of mass 500.0g is released from point A 5m above the ground ...

physics - A solid sphere of mass m and radius r rolls with out slipping along ...

physics - A 22 kg sphere is at the origin and a 12 kg sphere is at (x, y) = ( 22...

physics - In the figure below, a uniform sphere of mass m = 2.50 kg and radius r...