Calculate the force off earth's gravity on a spacecraft 12,800 km above the earth's surface if its mass is 1350 kg

Assume that the Moon is hit by about 25 million micrometeorite impacts each day (this number comes from observations of meteors

mestny [16]

Answer:

3.03 Billion Days or 8.30 Million years

Explanation:

Given,

No. of micrometeorite impacts per day on the Lunar surface = 25000000

Impacts needed to erase a footprint = 20

Area of footprint = 300 cm²

We know that surface area of the Moon = 37.93 Million Km² = $37.93\times 10^{16} cm^{2}$

To find: How long will it take to erase one footprint?

Using the above information,

No. of impacts per cm² per day is

$= \frac{25000000}{37.93\times 10^{16}}$

No. of impacts on area of a foot print (300 cm²) per day will be,

$= \frac{25000000}{37.93\times 10^{16}}\times 300$

$= 6.59\times 10^{-9}$

To erase the footprint there must be 20 impacts on the area of footprint.

Time taken for $6.59\times 10^{-9}$ impacts = 1 Day

Time taken for 1 impact is

$= \frac{1}{6.59\times 10^{-9}} days$

Hence, time taken for 20 impacts will be

$= \frac{1\times20}{6.59\times 10^{-9}} days$

$= 3.03 \times 10^{9} days$

$= \frac{3.03 \times 10^{9}}{365}years$

$= 8.30 \times 10^{6} years$

It would take around 3.03 Billion Days or 8.30 Million years for one of the footprints left by the Apollo astronauts to be erased.

6 0

3 years ago

Which of the following statements is true of both ancient Egypt and ancient Sumer?

tiny-mole [99]

The answer to this question is:
A. Barley and wheat were both civilizations' main crops

Happy Studying!!! :)

3 0

3 years ago

Read 2 more answers

An African merchant would like to travel by land to purchase luxury goods that are available only in China. Which trade routes w

Anna [14]

"Silk Road trade routes" is the one route among the following choices given in the question that he would most likely follow to achieve his goal. The correct option among all the options that are given in the question is the third option or option "c". I hope that this is the answer that has come to your desired help.

3 0

3 years ago

Read 2 more answers

Which phrase gives two processes scientists think move the Earth's lithospheric plates?

hammer [34]

Convection in the mantle and pressure of magma on the edge of the plate

Explanation:

Convection currents occur in the mantle because the upper mantle (asthenosphere) is generally cooler than the lower mantle. The convections apply upward pressure on the lower edges on the lithosphere as the melted rocks upwell from below. The lithosphere deflects the convections and as the convections churn clockwise of anticlockwise, they drag the lithosphere with it via friction. This is what is stipulated to cause tectonic plate movements.

Learn More:

For more on tectonic plate movement check out;

brainly.com/question/3296749

brainly.com/question/12253664

#LearnWithBrainly

7 0

3 years ago

Ano ang aral na nais iparating ng kuwentong “Mensahe ng Butil ng Kape”?

Alborosie

Answer:

I'm sorry I can't understand what your question is, but I have a suggestion for you

YOU SHOULD JUST ASK YOUR QUESTIONS IN YOUR OWN COUNTRY SO THAT SOMEONE CAN ANSWER IT AND ALSO YOUR POINTS WON'T BE WASTED IF YOU DO IT :) :) :)

8 0

3 years ago