Top answers

A ladder of length 6.5m is leaning against a vertical wall. The foot of the ladder is 1.5m from the wall. Calculate the distance the ladder reaches up the wall to 3 significant figures.

(using Pythagoras' theorem) 6.5 2 = x 2 + 1.5 2 x 2 = 6.5 2 - 1.5 2 x 2 = 42.25 - 2.25 x 2 = 40 x = sqrt(40) x = 6.32 (to 3sf) = 6.32m
PB
Answered by Pollyanna B. • Maths tutor
6284 Views

What is the role of calcium in synaptic transmission?

Calcium is found as an ion, Ca2+ in the extracellular space of the pre-synaptic neuron. The ions enter the neuron through voltage -gated channels after the depolarisation of the pre-synaptic neuron. This cau...
WF
Answered by Wiktoria F. • Biology tutor
21605 Views

Examine the view that the House of Lords is an outdated institution, and should be abolished or replaced

A pre-eminent reason why the House of Lords can be considered an outdated institution and should be abolished, is because it is entirely un-elected and thus contradictory to UK democracy. For instance, despi...
VG
10869 Views

Find the reflection of point P(2,4,-6) in the plane x-2y+z=6

If the point P' is a refection of point P in any plane, then both P and P' line on the line perpendicular to that plane. The equation of such line is easy to find: all we need is a point and the direction ve...
26876 Views

Zinc reacts with sulphuric acid (Zn + H2SO4 --> ZnSO4 + H2). Write out two separate equations for the species that are oxidised and reduced.

Zn --> Zn^2+ + 2e- (OXIDATION) H2^2- + 2e- --> H2 (REDUCTION)
SV
Answered by Sonali V. • Chemistry tutor
17934 Views