Question

P1:Suppose an object is launched from Earth with 0.52 times the escape speed. How many multiples...

P1:Suppose an object is launched from Earth with 0.52 times the escape speed. How many multiples of Earth's radius (RE = 6.37 x 106 m) in radial distance will the object reach before falling back toward Earth? The distances are measured relative to Earth's center, so a ratio of 1.00 would correspond to an object on Earth's surface. For this problem, neglect Earth's rotation and the effect of its atmosphere.

For reference, Earth's mass is 5.972 x 1024 kg.

Your answer is a ratio and thus unitless. Enter only a number in the answer box.

P2

Suppose an object is launched from Earth with 0.6 times the kinetic energy for escape. How many multiples of Earth's radius (RE = 6.37 x 106 m) in radial distance will the object reach before falling back toward Earth? The distances are measured relative to Earth's center, so a ratio of 1.00 would correspond to an object on Earth's surface. For this problem, neglect Earth's rotation and the effect of its atmosphere.

For reference, Earth's mass is 5.972 x 1024 kg.

Your answer is a ratio and thus unitless. Enter only a number in the answer box.

Homework Answers

Answer #1

P1)

we know, Escape speed on the surface of the Earth, ve = sqrt(2*G*Me/Re)

let r is the distance from center of the earth to the maximum height of the object reached.

let m is the mass of the object.

and v = 0.52*ve

now apply conservation of energy

-G*Me*m/Re + (1/2)*m*v^2 = -G*Me*m/r


-G*Me*m/Re + (1/2)*m*0.52^2*(2*G*Me/Re) = -G*Me*m/r


-G*Me*m/Re*(1 - 0.52^2) = -G*Me*m/r

0.7296/Re = 1/r

r = Re/0.7296

= 1.37*Re <<<<<<<<-------------------Answer

P2)

Again apply conservation of energy

-G*Me*m/Re + (1/2)*m*v^2 = -G*Me*m/r


-G*Me*m/Re + 0.6*(1/2)*m*ve^2 = -G*Me*m/r


-G*Me*m/Re + 0.6*(1/2)*m*(2*G*Me/Re) = -G*Me*m/r


-G*Me*m/Re*(1 - 0.6) = -G*Me*m/r

0.4/Re = 1/r

r = Re/0.4

= 2.50*Re <<<<<<<<-------------------Answer

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT