||Homework Help||Kindergarten-University. - Page 62

Originally posted by: Miggi

True or False:The average velocity of the molecules of air in an enclosed room is zero even though the average speed is close to the speed of the sound.

True.
The molecules move randomly in different directions, making the average velocity zero.

hey akhl thanks... would u please help me in manometer question on page 82 as well?i dont know how to do it at all.

Biology Help.

@siddhi209
1. The graphs for both the measured and the calculated pulse rates show that the purlse rate increases with speed.

6. Make sure the new recruits are relaxed and record their pulse rates.
Let all of them do an exercise.
Soon after the exercise, measure their pulse rates at regular interval, such as 30 seconds.
The time taken for the pulse rate to fall to the pulse rate when relaxed is the measure of fitness.

For others I need to know theory. So can you refer me to any web pages, which contain theory being taught in your class?

Originally posted by: akhl

@siddhi209
1. The graphs for both the measured and the calculated pulse rates show that the purlse rate increases with speed.

6. Make sure the new recruits are relaxed and record their pulse rates.
Let all of them do an exercise.
Soon after the exercise, measure their pulse rates at regular interval, such as 30 seconds.
The time taken for the pulse rate to fall to the pulse rate when relaxed is the measure of fitness.

For others I need to know theory. So can you refer me to any web pages, which contain theory being taught in your class?

@Miggi,
For the manometer problem, there must be a diagram. Can you give me the link to the diagram? You have given only the initial values but not the final values after the gas is heated. May be the diagram will show the final values.

hey akhl i figured out the answer thank u so much for your help :)

if we observe 400 and 2000 base pair sequence in a sample of DNA which is tested for Alu element what does that mean?

Hi Akhl,

I have the same question as Miggi however I was unable to answer it. It appears I cannot attach the image onto this document. It is simply a diagram of a manometer that has water.that is closed at one end and has a flask filled with gas at the other. The other value on the diagram is 1.0 cm, im not sure how you can use that. Thank you in advance :)

An experiment makes use of a water manometer attached to a flask. Initially the two columns of water in the manometer are at the same level and the air pressure in the flask and both sides of the manometer is 1 atm. The experiment is set up when the air temperature is 7 ?C. As shown, the left side of the manometer is connected to the flask and the right side is capped so that the air at that end will be compressed when the flask is heated by a gas burner. The cap is initially 15 cm above the water column (the accompanying diagram is not to scale for this). The volume of the flask is 1 x 10^4 m3. When calculating the change in the pressure associated with the heating of the gas in the flask, you can neglect the change in volume of the gas (air in this case) associated with the displacement of the water column in the manometer. Calculate how many calories (cal) have been added to the flask through heating from the gas burner, given that the specific heat of the air is 20.8 (J/K)/mol. (Hint: use the ideal gas law to figure out the pressure change in both sides of the manometer tube: in one case the pressure is changing through temperature and in the other it is changing through compression. Once you have the pressure change you can get the temperature change in the flask. Once you have that, you can figure out how much heat (Joules and then calories) has been added to the air in the flask).