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Old Dec 18th 2013, 06:01 PM   #1
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Physics Problems Help!

Hey everyone, just wondering if anyone could help me out with any of these physics problems.

Question 1

A 2.3 mole sample of a monatomic gas is held within a 6.0 m3 container. The pressure in the container is 11449 Pa. What is the temperature of the gas?

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Question 2

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A piece of metal (density = 1270 kg/m3) has a volume of 0.53 m3. What is the buoyant force on the metal when it is placed into a tank of water (density = 1000 kg/m3)?

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Question 3

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A simple hydraulic system consists of a container that has a small piston (area = 0.22 m2) at one end and a large piston (area = 4.31 m2) at the other end. What is the force at the large end if a 21 N force is applied to the small end?

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How much work is done on a sample of gas if the internal energy is raised by 3551 J and the amount of heat added to the sample is 1903 J?

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A piece of wood (density = 781 kg/m3) has a volume of 0.76 m3. What is the buoyant force on the wood when it is placed into a tank of water (density = 1000 kg/m3)?

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A large tank is filled with water (density = 1000 kg/m3). The tank is open to the atmosphere at the top and if filled to a depth of 15.5 m. What is the absolute pressure at the bottom of the tank?

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A gas undergoes an isobaric process while the volume changes from 11.6 m3 to 12.5 m3. The pressure during the process is 15987 Pa. What is the work done on the gas during this process?

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A 7.4 mole sample of a monatomic gas is contained in a tank. The pressure in the tank is 1971 Pa and the temperature of the gas is 323 K. What is the volume of the tank?

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A large tank is filled with water (density = 1000 kg/m3). The tank is open to the atmosphere at the top and if filled to a depth of 19.3 m. What is the gauge pressure at the bottom of the tank?

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Water is flowing through a pipe that has a diameter of 1.74 m. The speed of the water in this pipe is 5.6 m/s. The pipe then narrows to a section that has a diameter of 0.47 m. What is the speed of the water in the narrow section of the pipe?

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Last edited by physicsscrub; Dec 18th 2013 at 07:37 PM.
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Old Dec 19th 2013, 04:01 AM   #2
MBW
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Just a few quick pointers

Q1 & Q8.
Look up the "Combined Gas Law" on Wikipedia.
Also from Wikipedia:
The molar volume of an ideal gas at 100 kPa (1 bar) is
22.710 980(38) dm3/mol at 0 C
24.789 598(42) dm3/mol at 25 C
The molar volume of an ideal gas at 1 atmosphere of pressure is
22.414 L/mol at 0 C
24.465 L/mol at 25 C
Molar volume is the volume occupied my one mole of gas at the given conditions of pressure and temperature.
2.3 moles will thus take up 2.3 times as much volume, under the same conditions of temperature and pressure.

Q2 & Q5.
The buoyancy force is dependent on the mass of waste displaced,
0.53 m3 at 1000 kg/m3 =530 kg of water displaced.
Force = mass * acceleration acceleration is due to gravity thus
Force = 530 kg * 9.82 m/s2

Q3
The ratio of the forces is the same as the ratio of the areas.

Sorry I haven't time at the moment, hopefully someone else will give you pointers for the rest.
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Old Dec 19th 2013, 10:37 AM   #3
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Ok, just one more

Q10.
The same volume of water per second has to go through the thin pipe as through the large pipe.
Volume per second is given by (speed of flow) * (cross-section area of the pipe)
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Old Dec 30th 2013, 08:42 PM   #4
Pmb
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Originally Posted by MBW View Post
Q10.
The same volume of water per second has to go through the thin pipe as through the large pipe.
Volume per second is given by (speed of flow) * (cross-section area of the pipe)
MBW = Please read the following to posts
Must read before posting a problem : please show your attempt!
The Helpers and the staff of the forum have agreed that they won't give a full answer to a problem posted with no attempt (except maybe in some cases). The Helpers are here to help you to understand your weaknesses by going through the asked questions with you and not here to solve your physics problems.
It is imperative to show an attempt to a problem. If you don't know how to start, say it. Helpers will give you a push in the right direction.

Welcome to the world of physics!
Forum rule
(m)No homework should be posted directly. Workings or any approaches to the questions should be shown to let others know you have made an effort or at least a try. It is to encourage people to learn but not to copy homework.
In this thread you didn't ask the OP to do any work at all. You did all the work for him! Were you not aware of the fact that no forum on the internet allows that to be done?
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