# physics

A 100-kg object is lifted to an altitude of 1000 km. What is the weight of the object on the ground? Does it have the same mass and weight at 1000 km? Explain.

1. 👍 0
2. 👎 0
3. 👁 152
1. on the ground, the weight is mg = 100*9.8 = 980N

Now, g=9.8 because

F = GMm/r^2 = mg, so
g = GM/r^2
If we say that r=6371km, then at 1000km altitude, we will have

9.8 * (6371/7371)^2 = 7.32, so the 100kg mass will weigh only 732N

1. 👍 0
2. 👎 0
posted by Steve

## Similar Questions

1. ### Physical Science

Two objects were lifted by a machine. One object had a mas of 2 kilograms, and was lifted at a speed of 2 m/sec. The other had a mass of 4 kilogram was lifted at a rate of 3 m/sec. ------------------------------------------- a)

asked by Jinja on September 26, 2017
2. ### math

(MC) If the compound interest on \$1000 for two years at 9% p.a., payable half-yearly is \$x, find x. A) 1000x9/100x2 B) 1000(1+9/100)⁴ C) 1000(1+4.5/100)⁴ D) 1000(1+9/100)²-1000 E) 1000(1+4.5/100)⁴-1000

asked by Anna Choi on October 26, 2016
3. ### physics

An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet. As a result, what happens to the mass and wieght of the object?

asked by Dee on February 10, 2011
4. ### physics

A 4.0 kg object is lifted 1.5 m. (a) how much work is done against the earth's gravity ? (b) repeat if the object is lowered insteadof lifted

asked by jack on March 19, 2012
5. ### calculus

Suppose the following about a certain object: I. The object's altitude is a function of time, represented by the function A(x) where here x is time. II. The temperature of the object is a function of its velocity, represented by

asked by matt on November 26, 2008
1. ### Math

Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on Earth also varies according to the elevation of the object? In particular, the weight of an object follows

asked by ASD on September 17, 2010
2. ### Physics

An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. If the object is released from rest after it is lifted, what is its kinetic energy just before it hits the floor? What is its velocity?

asked by Tim on December 9, 2012
3. ### Mathematics

Nathan and Steven stacked boxes on a shelf. Nathan lifted 13 boxes and Steven lifted 15 boxes. The boxes that Nathan lifted each weighed 12 lb more than the boxes Steven lifted. Which expression represents the total number of

asked by Anonymous on October 6, 2014
4. ### Math (for Damon)

Nathan and Steven stacked boxes on a shelf. Nathan lifted 13 boxes and Steven lifted 15 boxes. The boxes that Nathan lifted each weighed 12 lb more than the boxes Steven lifted. Which expression represents the total number of

asked by Anonymous on October 1, 2014
5. ### math

Nathan and Steven stacked boxes on a shelf. Nathan lifted 13 boxes and Steven lifted 15 boxes. The boxes that Nathan lifted each weighed 12 lb more than the boxes Steven lifted. Which expression represents the total number of

asked by anonymous on October 6, 2014

More Similar Questions