• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Physics, Chemistry and Biology: Post your doubts here!

Messages
948
Reaction score
4,940
Points
253
do we need a scientific calculator in biology paper
U can use it but it's not needed in paper 1 n paper 2 cuz normally it's theoretical part .... it's very rare dat u get calculations ( even if u get,it will b simple calculations) .....

Scientific calculator is recommended in paper 6 as it is practical part where most of the time there r calculations....
 
Messages
290
Reaction score
1,076
Points
153
U can use it but it's not needed in paper 1 n paper 2 cuz normally it's theoretical part .... it's very rare dat u get calculations ( even if u get,it will b simple calculations) .....

Scientific calculator is recommended in paper 6 as it is practical part where most of the time there r calculations....


any news about may june papers (how they were ,when is going out to be released etc)
 
Messages
948
Reaction score
4,940
Points
253
Can someone please help and explain me this physics question on pressure .....

-> A bicycle pump of length 45cm contains air with a pressure of 100kPa. In order to force air into the tyre, it is necessary to move the piston 15cm down the barrel. Calculate the pressure inside the tyre assuming the temperature is kept constant.
 
Messages
534
Reaction score
6,357
Points
503
Idk :( explain how u got the ans plz :)
Ok, So since the pressure and height is given for the bicycle pump before being pressed (which is 100KPa aka 100 000Pa and Height=45cm) So by using these values you can easily find the density of air by the formula: Pressure= Height*Density*gravitiation force (which is 10). So by reaaranigng the formula we can get Density= Pressure/Height*10 which in this case would be 100 000/10*45
Now after finding the density (222.22 we found above) we will proceed onto the part after the piston has been pushed.
Since the height was 45 before and the piston is pressed 15cm so the height down the barrel will be 45-15=30cm
Now use the pressure formula again and since you already found the density you can now easily find the answer
Pressure=Density*Height*10 So.. Pressure down the barrel (aka applied to the cycle tire)= 222.22*30*10=66666.7Pa (66.7 KPa)
 
Messages
948
Reaction score
4,940
Points
253
Ok, So since the pressure and height is given for the bicycle pump before being pressed (which is 100KPa aka 100 000Pa and Height=45cm) So by using these values you can easily find the density of air by the formula: Pressure= Height*Density*gravitiation force (which is 10). So by reaaranigng the formula we can get Density= Pressure/Height*10 which in this case would be 100 000/10*45
Now after finding the density (222.22 we found above) we will proceed onto the part after the piston has been pushed.
Since the height was 45 before and the piston is pressed 15cm so the height down the barrel will be 45-15=30cm
Now use the pressure formula again and since you already found the density you can now easily find the answer
Pressure=Density*Height*10 So.. Pressure down the barrel (aka applied to the cycle tire)= 222.22*30*10=66666.7Pa (66.7 KPa)
Thank u :*
 
Messages
534
Reaction score
6,357
Points
503
Ok, So since the pressure and height is given for the bicycle pump before being pressed (which is 100KPa aka 100 000Pa and Height=45cm) So by using these values you can easily find the density of air by the formula: Pressure= Height*Density*gravitiation force (which is 10). So by reaaranigng the formula we can get Density= Pressure/Height*10 which in this case would be 100 000/10*45
Now after finding the density (222.22 we found above) we will proceed onto the part after the piston has been pushed.
Since the height was 45 before and the piston is pressed 15cm so the height down the barrel will be 45-15=30cm
Now use the pressure formula again and since you already found the density you can now easily find the answer
Pressure=Density*Height*10 So.. Pressure down the barrel (aka applied to the cycle tire)= 222.22*30*10=66666.7Pa (66.7 KPa)
Phew that was long:p
And since I did't know the exact answer I'm not sure about my answer it could be wrong too. But this was the only way to do so.
 
Messages
948
Reaction score
4,940
Points
253
Ok, So since the pressure and height is given for the bicycle pump before being pressed (which is 100KPa aka 100 000Pa and Height=45cm) So by using these values you can easily find the density of air by the formula: Pressure= Height*Density*gravitiation force (which is 10). So by reaaranigng the formula we can get Density= Pressure/Height*10 which in this case would be 100 000/10*45
Now after finding the density (222.22 we found above) we will proceed onto the part after the piston has been pushed.
Since the height was 45 before and the piston is pressed 15cm so the height down the barrel will be 45-15=30cm
Now use the pressure formula again and since you already found the density you can now easily find the answer
Pressure=Density*Height*10 So.. Pressure down the barrel (aka applied to the cycle tire)= 222.22*30*10=66666.7Pa (66.7 KPa)
I didn't knew abt the formula pressure=density * height .....
 
Top