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Describe the changes at the cell membrane of a neuron during an action potential.

At rest the membrane potential is -70mV.

This is due to the Na⁺/K⁺ pump, which actively transports 3 Na⁺ ions out of th...

Answered by Alex N. • Biology tutor

11395 Views

What is the mass of an object travelling at 15 m/s with a kinetic energy of 100 J?

Kinetic Energy (E_k) = 1/2(mv²).This can be rearranged such that, m = (2E_k)/v²we know from the question that E_k= 100 J and we know that v = 15 m/sso ...

Answered by Tutor19729 D. • Physics tutor

3451 Views

Dipen and Nisha are planning their wedding reception. Nisha says, “I want to invite 70 guests.” Dipen says, “If we invite one-fifth fewer guests, we will save more than £500” Is Dipen correct? (Taken from Nov 2014 AQA Unit 2)

Need to calculate two things in order to answer the question:

1) Total cost of Nisha's 70 guests.

2) Total cost of Dipen's 'one-fifth fewer' guests.

For Nishen...

Answered by Alex N. • Maths tutor

5697 Views

What's the difference between distance and displacement

Distance is a scalar, meaning it only has a magnitude. Displacement is a vector, meaning that it has both magnitude and direction. For instance, distance can state that I am "x" metres away f...

Answered by Emma G. • Physics tutor

18021 Views

Differentiate y=x*ln(x^3-5)

We can immediately see that more than differentiation rule will be needed here. The expression in question is the product of two smaller expressions, so the product rule may be useful. But to apply the...

Answered by Nat N. • Maths tutor

6818 Views