Search our library of homework questions

Top answers

All subjects

All levels

Explain the shapes of the molecules NH3 and AlCl3 (using diagrams)

Covalent molecules come in all shapes and sizes, depending on pairs of electrons in the outer shell, which repel each other due to their negative charge....

Answered by Holly S. • Chemistry tutor

24401 Views

Name 3 effects that the sympathetic nervous system has on human physiology?

Constriction of blood vessels Dilation of pupils Slows down digestion

Answered by BARIBEFE V. • Biology tutor

2379 Views

Write the name of each of the four components of the working memory model in the space provided.

Central executivePhonological loopVisuo-spatial sketch pad Episodic buffer

Answered by BARIBEFE V. • Psychology tutor

2211 Views

Let y = x^x. Find dy/dx.

This question is suited to A2 maths students, particularly those who are doing further maths and may be looking for a challenge. In one question it tests the students ability to use implicit differentiati...

Answered by James G. • Maths tutor

6013 Views

An elastic wire suspended from a workbench has a 2kg mass attached to its free end. The wire changes in length by 2cm. Calculate the elastic potential energy stored in the wire.

Using Hooke's law (F = k * e) we can find the spring constant. Rearranging for k, we find that k = (9.81 * 2)/0.02 = 981 N/m. To calculate this we needed to find the force acting on the wire (F = mg) and ...

Answered by James G. • Physics tutor

1939 Views