How Does Gravity on a Foreign Planet Affect Movement and Physics?

In summary: The problem says straight up. I don't think parabolic motion is an issue. What may be an issue is interpretation of "as hard as he can". One might assume that means the same initial velocity, but I suspect that is not what it means. If the man can apply a certain amount of force for a certain distance on earth, he should be able to do the same on the planet. I would assume he does the same amount of work on the object in either case....
  • #1
blaster0
9
0
A colonist on a distant planet with a radius 0.92 times the Earth's is pulling on a box of mass 12 kg across the floor. The coefficient of static friction between the box and the floor is 0.70. He has to pull with a force of greater than 73N to start the box moving.
a) Determine the mass of the planet.
b) Determine the acceleration due to gravity of an object in free fall near the surface of the planet.
c) On the earth, if the colonist were to throw the box directly upward as hard as he could, it would reach a maximum height of 6.3m. How high would the box go if he threw it on this planet?
d) What is the total time this box would be in the air? How does this compare to the time in the air if thrown upwards on the surface of the earth?

Here are my answers, but I am not sure about all of the answers.
a)4.5*10^24
b)8.7
Not sure here
c)5.6
Really not sure here
d)2.269 and for the second part i have no idea what's flying.

Thanks for all your help in advance
 
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  • #2
blaster0 said:
A colonist on a distant planet with a radius 0.92 times the Earth's is pulling on a box of mass 12 kg across the floor. The coefficient of static friction between the box and the floor is 0.70. He has to pull with a force of greater than 73N to start the box moving.
a) Determine the mass of the planet.
b) Determine the acceleration due to gravity of an object in free fall near the surface of the planet.
c) On the earth, if the colonist were to throw the box directly upward as hard as he could, it would reach a maximum height of 6.3m. How high would the box go if he threw it on this planet?
d) What is the total time this box would be in the air? How does this compare to the time in the air if thrown upwards on the surface of the earth?

Here are my answers, but I am not sure about all of the answers.
a)4.5*10^24
b)8.7
Not sure here
c)5.6
Really not sure here
d)2.269 and for the second part i have no idea what's flying.

Thanks for all your help in advance
I did not check a) because I don't remember the mass of the Earth and I don't know what you did to get it. b) looks OK. c) does not. If b) is correct it should go higher on the foreign planet. For d) think about it a bit more after you get c) You should be able to find how long it takes an object to reach maximum height when you know the maximum height.

By the way, all of your answers are wrong until you supply the units.
 
  • #3
I know I have the units and thanks for spotting the stupid 5.6 mistake. I'll get back to you tonight to tel if I got it.

By the way mass of planet is gotten from Fg=GMm/r^2
Where in this caser I will know Gmr and Fg
Fg=N
f=mu*N
N=f/mu
here is 73/0.70
=104.286
and in the end M should come out to what I said.

Thanks again
 
  • #4
blaster0 said:
I know I have the units and thanks for spotting the stupid 5.6 mistake. I'll get back to you tonight to tel if I got it.

By the way mass of planet is gotten from Fg=GMm/r^2
Where in this caser I will know Gmr and Fg
Fg=N
f=mu*N
N=f/mu
here is 73/0.70
=104.286
and in the end M should come out to what I said.

Thanks again
That's fine. You could also deduce the ratio of the mass of the planet to the mass of the Earth from the ratio of the normal force on the planet to the normal force on Earth since you know the ratio of the radii. There is often more than one way to get there.
 
  • #5
ok new issue with this question my time comes out to be 2.556 seconds, it seems that the man is throwing it so it moves parabolically, some of my friends have different answers so if u could help that'd be great
 
  • #6
blaster0 said:
ok new issue with this question my time comes out to be 2.556 seconds, it seems that the man is throwing it so it moves parabolically, some of my friends have different answers so if u could help that'd be great
The problem says straight up. I don't think parabolic motion is an issue. What may be an issue is interpretation of "as hard as he can". One might assume that means the same initial velocity, but I suspect that is not what it means. If the man can apply a certain amount of force for a certain distance on earth, he should be able to do the same on the planet. I would assume he does the same amount of work on the object in either case. It then becomes a question of energy, which is fortunate becaue you don't know how high the release point is anyway so knowing the release velocity would not be enough to solve the problem.
 

FAQ: How Does Gravity on a Foreign Planet Affect Movement and Physics?

What is movement on foreign planets?

Movement on foreign planets refers to the physical movement of objects or living organisms on planets other than Earth. It includes both natural movements, such as the rotation and orbit of the planet, as well as movements made by humans or robots exploring these planets.

What challenges are faced when moving on foreign planets?

Moving on foreign planets presents a number of challenges, including differences in gravity, atmosphere, and terrain. The lack of oxygen and extreme temperatures on some planets also make movement difficult. Additionally, the long distances and communication delays between Earth and these planets make it challenging to control and monitor movements from afar.

How do scientists study movement on foreign planets?

Scientists use a variety of methods to study movement on foreign planets. This includes analyzing data from rovers and spacecraft, conducting experiments in simulated environments, and using computer models to simulate movement in different conditions. Scientists also study the movement patterns of organisms on Earth to gain insights into how they might behave on other planets.

Can humans survive and move on foreign planets?

It is possible for humans to survive and move on foreign planets, but it would require extensive preparation and technology. The challenges of different gravity, atmosphere, and terrain would need to be addressed, as well as the need for food, water, and shelter. Research and technology advancements are ongoing in order to make human movement on foreign planets a possibility in the future.

What are the potential benefits of studying movement on foreign planets?

Studying movement on foreign planets can provide valuable insights into the evolution and behavior of other planets in our solar system and beyond. It also helps us understand the potential for life on other planets and how humans might one day be able to live and move on them. Additionally, the technology and innovations developed for movement on foreign planets can have applications in other fields, such as robotics and space exploration.

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