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An airplane accelerates steadily from rest to 355 m/s, after travelling a distance of 105,000 m. How long, in minutes, does it take the airplane to reach this speed?

The first step is to identify which components of the ‘SUVAT equations of motion’ the question gives us. Here we have the initial ( u ) and final ( v ) speeds, the distance ( s ) and we are trying to calcula...
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Answered by Rachael T. • Physics tutor
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Describe the process of beta-minus decay. What happens to the mass number and atomic number when alpha, beta, and gamma decay occurs?

In beta-minus decay, a neutron decays into a proton plus an electron. For alpha decay, the mass number decreases by 4 and the atomic number decreases by 2. For beta-minus decay, the mass number remains the s...
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Answered by Isabelle C. • Physics tutor
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Why do cells divide and how do they do this?

Cells need to divide in order for an organism to grow. Cells can become damaged with time and so need a way to regenerate and produce new cells. There are certain stages throughout the process of cell divisi...
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Answered by Caitlin H. • Biology tutor
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Biology AQA Past Paper (2015) - Unit 03 (Higher). Describe how the brain monitors body temperature.

The hypothalamus is the processing centre in the brain that controls body temperature (constant temperature of 37ºC approx.). It triggers changes to effectors, such as sweat glands and muscles controlling bo...
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Answered by Diego M. • Biology tutor
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Biology AQA Past Paper (2015) - Topic 7. Ecology: What is eutrophication?

Eutrophication is an enrichment of water by nutrient salts that causes structural changes to the ecosystem such as: increased production of algae and aquatic plants (algal blooms), depletion of fish species,...
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Answered by Diego M. • Biology tutor
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