Physics, Chemistry and Biology: Post your doubts here!

[qazmed]

use of a set square or protractor, place the set square side by side with the pin and make sure they are aligned or with the protractor, make sure the angle between the pin and the paper is 90

guys how to draw a histogram in bio p6
it gives eg 50-59 as the class width shud i do it 50-60 or wat??

 

[Stephanie Hyacinth]

guys how to draw a histogram in bio p6
it gives eg 50-59 as the class width shud i do it 50-60 or wat??

no take the figures directly so it should be 50-59 and it should touch

 

[Mavilda Bucket]

Sis, the oil glands are to lubricate the feathers. The uropygial gland secretes the oils. This gland is found near the base of the tail and produces an oily substance that contains diester waxes that help waterproof feathers and keep them flexible. Birds will spread this oil to each feather.

Actually, it's like most people believe that birds waterproof their feathers by the oil located on their backs but that is not how they waterproof it. The interlocking hooks and barbules on feathers is what makes a bird waterproof and not all bird are waterproof.

Another theory says that bird feathers aren’t naturally waterproof. But birds can make them water resistant by applying waxes from their preen glands.

You may have watched a pet parrot grooming its own feathers – the bird will alternately rub its head against the base of its tail, and against its other feathers. It is depositing waxy, water-resistant oils found in the preen gland (at the tail base) onto the other feathers.Birds also have a dusty powder in their feathers. This powder comes from special feathers called “powderdowns”, which are constantly disintegrating into waterproof powder. This powder adds to the water-resistant quality of feathers.

It is essential for birds like ducks to constantly preen their feathers to keep them in good shape, and to keep distributing these waterproof oils and powders.Seabirds that dive underwater have particularly dense feathers, which also helps water from penetrating through the feathers to the bird’s body.

Hope that helps

thnx alottttt...jzk

 

[princess sofia]

how to draw thx
sme1 plz help

 

[Ameena Eesa]

Guys what does, 'practical' source of inaccuracy mean?

 

[Ameena Eesa]

Help with 5, b

 

[Awesome12]

Help with 5, b

50 degrees celcius cuz as the temp increases, the time decreases, but the time for 50 is more than that for 40

 

[Muhammad_Hamza]

I want someone to Check my work either i have done correct or not Please reply fast .....

 

[Ameena Eesa]

50 degrees celcius cuz as the temp increases, the time decreases, but the time for 50 is more than that for 40

Yeah, thought that was the answer too. But ms says 40 degrees..............

 

[Awesome12]

I want someone to Check my work either i have done correct or not Please reply fast .....

I think they are wrong. Firstly the direction of the arrows in the first coil should be in the opposite direction, but the central arrow is correct. Plus the magnetic field lines of the coils should intersect or touch, and only then will emf be induced

 

[Ameena Eesa]

This one! Boggling me, pleaseeeeeeeeeeeeee show.

 

[Ameena Eesa]

I think they are wrong. Firstly the direction of the arrows in the first coil should be in the opposite direction, but the central arrow is correct. Plus the magnetic field lines of the coils should intersect or touch, and only then will emf be induced

InshaaAllah will include you in my duas

 

[Awesome12]

Yeah, thought that was the answer too. But ms says 40 degrees..............

yes 40 is the answer cuz for every 10 degrees rise, there is a deduction of 36 seconds, but it is not in 40

 

[Awesome12]

This one! Boggling me, pleaseeeeeeeeeeeeee show.

Apply the principle of moments
the plunger exerts an upward force
The lever arm exerts a downward force
But they are both on the same side of the pivot

Distance between downward force and pivot= 500
Distance between upward force and pivot= 120

Thus
500 * 20 = F *120

InshaaAllah will include you in my duas

Thanks

 

[Ameena Eesa]

Apply the principle of moments
the plunger exerts an upward force
The lever arm exerts a downward force
But they are both on the same side of the pivot

Distance between downward force and pivot= 500
Distance between upward force and pivot= 120

Thus
500 * 20 = F *120


Thanks

As your name Awesome12...?

 

[qazmed]

h

no take the figures directly so it should be 50-59 and it should touch

how wud they touch there is one square between them

 

[Ameena Eesa]

Apply the principle of moments
the plunger exerts an upward force
The lever arm exerts a downward force
But they are both on the same side of the pivot

Distance between downward force and pivot= 500
Distance between upward force and pivot= 120

Thus
500 * 20 = F *120


Thanks

Clockwise/anticlockwise, no?

 

[Stephanie Hyacinth]

h
how wud they touch there is one square between them

it's a histogram therefore it should touch but if it was a bar chart then you can have squares in between

 

[Ameena Eesa]

This one too. Sorry if i am pestering................

 

[qazmed]

it's a histogram therefore it should touch but if it was a bar chart then you can have squares in between

eg 5-5.9 and 6-6.9 and 7-7.9
if i dont change each to 5-6 and 6-7 and 7-8they wont touch