Thursday

July 31, 2014

July 31, 2014

Posted by **Sam** on Thursday, March 24, 2011 at 5:22pm.

1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth

0"

(approximately 3950 miles)," h" is the distance above Earth's surface, and

"w is the weight of the object on the surface of the Earth.

0"

a) At what height will a 150-pound object weigh 50 pounds?

I used the following:"w = 150 w(h)= 50 r=3950

0"

So I plugged these values into the equation given:

50=(3950/3950 + h)^2*150

and my answer was h= 7900

b) How high would a crow carrying a whelk haveto fly for the whelk's weight to change by 0.1%?

- Pre-Calc H.W. Help :) -
**MathMate**, Saturday, March 26, 2011 at 7:18pmDon't know how you got 7900.

50=(3950/3950 + h)^2*150

transpose and square root

(3950+h)/3950 = sqrt(150/50)

h=6842-3950=2892 (miles)

Similarly for the crow:

(3950+h)/3950)=sqrt(1.001/1.000)

h=1.97 miles

**Related Questions**

Pre-Calc (Please my class starts in an hour!! :) - Can someone please help me ...

Pre-Calculus - Can someone please help me with the following question. 1) The ...

MATH - Can someone please help me with the following question. 1) The weight of...

ALGEBRA - 1. Many people know that the weight of an object varies on different ...

Pre-Calc - I'm stuck on a pre-calc problem. I need to find y as a function of x...

math - An object's weight on the Moon is less than its weight on Earth. This is ...

math - 1. Many people know that the weight of an object varies on different ...

Algebra II - The force of attraction between the earth and some object is called...

Algebra II - The force of attraction between the earth and some object is called...

Physics - Suppose a new extrasolar planet is discovered. Its mass is double the ...