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Science

Four adaptations of the root hair that enable it to Carry out its function

- Root hair cells have long projections called root hairs which increase the surface area for efficient uptake of water and minerals. - Root hairs also have very thin cell walls decreasing the diffusion distance allowing for quicker osmosis. - They have lots of mitochondria for active transport of minerals into the plant. - They have lots of dissolved minerals and sugars in the cytoplasm giving th... more

Zuzia Bieda
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773 students helped

Science

The velocity of a car increases from 8 m/s to 28 m/s in 10 seconds without changing direction calculate its acceleration

acceleration can be calculated using SUVAT S- displacment U- initial velocity V- final velocity A- aceleration T- time For this one we should use v = u + at rearrange to make a the subject: a = (V-U)/t Solve: a = (28-8)/10 a = 20/10 a = 2 ms-2 Any more questions? Let me know :)

Soumya Sri Pichuka
·

1.2k students helped

Science

An electric motor uses 50j of electrical energy and does 40j of work

Motors tend to not be 100% efficient so in this case, the 10j of energy could have been dissipated as heat energy. Check out energy Sankey diagrams and have a read through: https://www.bbc.co.uk/bitesize/guides/zgvc6fr/revision/3 Let me know if you have any more questions :)

Soumya Sri Pichuka
·

1.2k students helped

Computer Science

M=n+x/p

Science

What is the root cause in this case

Deleted Account
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577 students helped

Science

What causes the person with emphysema to find exercise difficult

Emphysema is a lung condition that causes shortness of breath. This happens when the inner walls of the alveoli in the lungs become weak rupture, making bigger airspaces instead of smaller ones. This means that when an individual takes a breath, they can’t fill their lungs as much since there is now a reduced surface area for the gas exchange to take place on. When we exercise, our hearts beat f... more

Maryam Hussain
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113 students helped

Science

A bunch of seeds was put in a large underground hole. After a sometime, only the seeds on the outside germinated while the seeds at the centre of the hole did not terminate. Why is that so?

The germination of seeds requires optimum temperature, oxygen and water availability. It is likely that when seeds are put in a large underground there is low oxygen availability for the seeds at the centre of the hole compared to those seeds that are on outside. As a result due to the lack of ideal conditions the seeds at the centre remain dormant and are hence unable to germinate.

Soumya Sri Pichuka
·

1.2k students helped

Science