Top answers

Expand and simplify 3(m + 4) – 2(4m + 1)

The first thing that we are going to do to tackle this problem is to expand the bracket on the left-hand side (3(m+4)). To do this you have to multiply each of the terms inside the bracket with the 3 that is...
RR
Answered by Rahee R. • Maths tutor
4930 Views

The energy transferred from the water in the kettle to its surroundings in 2 hours is 46 200 J. The mass of water in the kettle is 0.50 kg. The specific heat capacity of water is 4200 J/kg °C. What is its temperature after 2 hours?

The water loses 4200 J/kg °C * 0.5 kg = 2100 J/°C As it's lost 46,200 J in total (regardless of the time it took for this to happen), it must have reduced in temperature by 46,200 J / 2100 J/°C = 22°C. Assum...
DB
Answered by Dewi B. • Physics tutor
27350 Views

1) 3x + y = 11 2) 2x + y = 8

Subtract 2) from 1), we get x = 3. This means that y must be 2.
DB
Answered by Dewi B. • Maths tutor
3686 Views

Explanation of alpha scattering experiment

Alpha particles which are made up of 2 protons and 2 neutrons (overall positive charge) are fired towards a thin sheet of gold. To ensure any deflection of the alpha particles is only due to the gold sheet t...
JM
Answered by James M. • Physics tutor
20644 Views

Evaluate the view that economic growth is best achieved through improvements in technology

Economic growth refers to an increase in real GDP (or output) and can be achieved in a number of ways not only including an improvement in technology but also attempts at improving the human capital of an ec...
HN
Answered by Hari N. • Economics tutor
10867 Views