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An astronaut stands at a position on the Moon such that Earth is directly over head and releases a Moon rock that was in her hand. (a) Which way will it fall? (b) What is the gravitational force exerted by the Moon on a 1.0-kg rock resting on the Moon's surface? (c) What is the gravitational force exerted by the Earth on the same rock resting on the surface of the Moon? (d) What is the net gravitational force on the rock?

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Bunny Greenfelder
Bunny GreenfelderLv2
4 Sep 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Question 1

If you drop a 2.22 kg rock from a height of 1.25 m on Mars whosemass is 6.42x1023 kg and radius is 3.37x106 m, what will be the netforce on the falling rock in Newtons?Answer 8.37 N
13.4 N
19.0N
21.8 N
.


If you drop a 2.22 kg rock from a height of 1.25 m on Mars whosemass is 6.42x1023 kg and radius is 3.37x106 m, what will be therock's speed when it strikes Mars surface?Answer 1.49 m/s
2.63 m/s
3.07 m/s
5.34 m/s


What is the magnitude of the gravitational force between the Earthand the Moon? The mass of the Moon is 7.349x1022kg and its meandistance from the Earth is 3.84x108m. The equatorial radius of theEarth is 6378 km and its mass is 5.974x1024kg.Answer 1.99x1014N
1.99x1016 N
1.99x1018 N
1.99x1020 N
.


At what distance from the center of the Earth will the force ofgravity due to the Earth be Equal to the force of gravity of theMoon, i.e. where between the Earth and the Moon will the force ofgravity be the same? The mass of the Moon is 7.349x1022kg and itsmean distance from the Earth is 3.84x108m. The equatorial radius ofthe Earth is 6378 km and its mass is 5.974x1024kg.Answer 1.44x108m
1.71x108 m
2.49x108 m
3.45x108 m

a.) A hockey puck is observed to be sliding along a flatfrictionless surface at a speed of 4 cm/min. There is no net forceacting on the puck. Assuming it doesn't smash into anything, howfast will the puck be going 17 min later?
cm/min

b.) An object is accelerating. Which one of the followingstatements is true?
The object must be speeding up.
Gravity must be causing the object to accelerate.
The object must be changing directions.
The object must be slowing down.
There is a net force acting on the object.

c.) A 100 kg block weighs 220 lb on Earth. If the block weretransported to a planetary body that had a smaller free fallacceleration (as compared to Earth), which one of the followingwould be true?
The block would have the same weight and a smaller mass.
The block would have the same mass and a bigger weight.
The block would have the same mass and the same weight.
The block would have the same weight and a bigger mass.
The block would have the same mass and a smaller weight.
d.) What does it mean (in physics) to say that a quantity isconserved?
It means that the quantity is not being used.
It means the total amount is zero.
It means the total amount never changes.
It means it's being saved up.

e.) At a certain point in time, the total energy of a closed systemis observed to be 176 J. Which one of the following statements istrue?
Three hours later the energy of the system is 352 J.
Four hours later the energy of the system is 88 J.
All of the energy must be kinetic if the objects are moving.
Twelve hours later the energy of the system is 176 J.
Some of the energy must be potential.

g.) Which of the following statements are impossible? Choose allthat apply.
The parked truck had 8770 J of KE.
The scooter had 0 J of KE and 0 kg·m/s of momentum.
A ball moving in a circle had 0 N of net force acting on it.
A box had an acceleration of 0 m/s2 while a net force of 311 Nacted on it.
Jack exerted 18 N of force due east on a cart. As a direct result,the cart exerted 18 N of force due west upon Jack.
A toothpick exerts a smaller gravitational force upon the Moon thanthe Moon exerts upon it.

a.) Two balls make up a closed system. Ball A has 701 J of energyand ball B has 78 J. After they collide, ball A has 665 J. How muchenergy does ball B have after they collide?
J

b.) An asteroid and a comet collide head on. Prior to thecollision, the asteroid has a momentum of 700,000 kg·m/s up and thecomet has a momentum of 800,000 kg·m/s down. After the collisionthe asteroid has a momentum of 750,000 kg·m/s down. After thecollision, what is the comet's momentum?
kg·m/s
North
South
East
West
Up
Down
Left
Right
No direction because the comet has stopped

c.) How much does a 28 kg object weigh on Moon? Please feel free toreference the Solar System Data table located at the beginning ofUnit II.
______N

d.) A 660 N net force acts on a 42 kg object. Determine theobject's acceleration.
_____m/s2

e.) Calculate the gravitational force between a 657 kg object(resting on Earth) and the Moon. The mass of the Moon is 7.347×1022kg and the distance between the object & the Moon is 3.844×108m.
____N

(a) What is the weight of a 5.78 kg backpack at the surface ofthe Earth?
56.7 N ( I understand this problem after some time :) )
(b) What is the weight of the same backpack at the surface of theMoon where the acceleration due to gravity is only 1.6 m/s2?
9.37 N (as well as this problem)

(c) If the backpack is atthe surface of the Earth, and if a net force of 8 N is applied tothe backpack, what is the amount of acceleration of thebackpack?
(Not sure here)

m/s^2
I was thinking A = Fnet/m
Fnet being the total force on the object being equal to G(mass ofthe earth)/(radius of the earth)^2
(I know it isn't as simple as adding 8N to the weight of backpackat the surface of the earth, if I divide by the net force thatisn't adding the net force to the weight...Please Help)


(d) If the backpack is atthe surface of the Moon, and if the same net force is applied tothe backpack, what is the amount of acceleration of thebackpack?
(If I don't understand C of course I am confused on this problem aswell, thank you for your help in advance I can figure out where togo with this problem if I understand C)

m/s2
Please explain to me so that I understand for test

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