Thursday

October 23, 2014

October 23, 2014

Posted by **bobpursley** on Sunday, March 11, 2007 at 11:08pm.

However, consider this. If the initial PE existed, wouldn't you have to add it to the initial KE then subtract the PE at some R from the center? We normally make ground zero PE level, but for this...

Zero, a hypothetical planet, has a mass of 1.0 1023 kg, a radius of 3.0 106 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface.

(a) If the probe is launched with an initial kinetic energy of 5.0 107 J, what will be its kinetic energy when it is 4.0 106 m from the center of Zero?

(b) If the probe is to achieve a maximum distance of 8.0 106 m from the center of Zero, with what initial kinetic energy must it be launched from the surface of Zero?

>>>>>>>>>>>>>>>>>>>>>>>>>>>>

What equation do I start with?

I tried using:

E = KE - GMm/R and came up with the wrong answer. Am I doing something wrong? PLEASE HELP!

How about the equation:

KE(initial)-(GMm)/R = KE(final)-(GMm)/10R

I am still confused as to what value to use for R for a...Do I use 4e6 for both R's?

Thanks.

**Answer this Question**

**Related Questions**

chem - how much water would you need to add to 20.0 mL of 2.0 M NaCl to make a 0...

Chemistry - The reaction X + Y --> products was studied using the method of ...

Geometry MATH CHECK - Check? In your own words, explain why we use the formula ...

Physics - A. Consider the motion of a projectile. It is fired at t= 0. Its ...

Math - A car is projected directly up an incline and its location from its start...

chemistry - Use the initial pH of the acetic acid solution to find the initial [...

Algebra - Hello all! I had a quick homework question: I have to prove that the ...

phys. - Hey, i feel kinda embarassed asking this because it looks so simple. a ...

Phyiscs - due at 11PM EST!! - Two identical conducting spheres, fixed in place, ...

physics - a juggler throws a ball with an initial horizontal velocity of +1.1 m/...