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An ice cube with a small iron ball in its centre is placed in a cup of water. 3.9 x 10-3kg of water in the cup is displaced and the volume of the ice cube is 4.0 x 10-6m3. Ice density: 1000 kg m-3 Iron density: 7800 kg m-3, what is the volume of the iron?

Firstly you need to know that the weight/mass of water displaced by the cube is equal to the weight/mass of the ice cube: 3.9 x 10^-3kg You then need to recognise that the weight of the cube is...

Answered by Adam C. • Physics tutor

10068 Views

When do I use the Konjuntiv I?

The Konjunktiv I is primarily used for indirect speech. This is when the narrator/speaker communicates what someone has said eg "He said that he was going swimming" "Er sagte, dass er schwi...

Answered by Roisin M. • German tutor

1573 Views

‘Smokers suffer from more lower respiratory tract infections.’ Justify this statement in light of respiratory tract protection mechanisms.

Smoke contains many harmful chemicals and carcinogens (such as polycyclic aromatic hydrocarbons). There are several ways in which smoking increases the likelihood of lower respiratory tract infections.

Answered by Ali K. • Human Biology tutor

2980 Views

R=1000e^-ct , it takes 5730 years for half of the substance to decay a. find the number of atoms at the start of the decay. b. calculate the number of atoms left when t=22920. c. sketch the function.

a.1000 b. R=62.5 c. Sketch

Answered by Prasad U. • Maths tutor

4768 Views

How do you integrate ln(x)?

I would use the whiteboard and write down y=lnx, and also the integration by parts formula below it. I would then explain how to treat ln(x) as the "u" and "1" as dv/dx; including why ...

Answered by Jamie Z. • Maths tutor

3451 Views