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27 Nov 2019

What is the bouyant force on an object weighing 10N thatdisplaces 8X10^-6 m^3 of ethyl alcohol?

I know mass density of ethyl alcohol is 791

and weight density is 49

My problem is I am not sure which is used in the formula tofigure this out

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Related textbook solutions

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

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Hi, we just started electrostatics in my class, and I amveryconfused about this homework problem.

An infinitely large flat electrode is levitating an objectthatweighs 50 kg. That object has a surface charge of + 75Coulombs.What is the mass density of the electrode?

I know that the electrostatic force will be equal to the forcefromgravity which will be (50kg)*(9.82 m/s2). I have noideawhat formula to use however to determine the massdensity.

Thanks a bunch

Hi, we just started electrostatics in my class, and I amveryconfused about this homework problem.

An infinitely large flat electrode is levitating an objectthatweighs 50 kg. That object has a surface charge of + 75Coulombs.What is the mass density of the electrode?

I know that the electrostatic force will be equal to the forcefromgravity which will be (50kg)*(9.82 m/s). I have no ideawhatformula to use however to determine the mass density.

Thanks a bunch

(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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