The patient is injected with a radioactive isotope with short half-life, for eg Fluorine-18. This isotope decays into positrons. The area damaged with tumour requires more blood supply compared to …
s=((u+v)/2)t1000=((10+22)/2)t1000=(16)tt= 62.5s
Micheal should sit at a distance of 1m from the pivot or half whatever distance Jessica sits. This is found intuitively here but can be found with any two masses …
In a free body diagram for a box on a rough slope, there will be three arrows. One will point out of the box up the slope (parallel to the …
Distance is a scalar which means it only has a length- it is the length of distance travelled along a pathDisplacement is a vector which means it has a direction …
So we need to break this down into two parts, what are Newtons laws and what is terminal velocity? In this case we will only need the first two of …
a) Current is defined as the rate of flow of charge; I = Q/t (Current is charge/time).b) Voltage is an electromotive force which drives the charge around the circuit. A …
The variables we are given are mass (m), time (t), temperate CHANGE (delta T) and SHC (c) and we are asked for energy. Think of the equations for energy we …
For a situation like this it is best to think of the energy of the car!The car has a kinetic energy = 1/2mv2 so if the speed has doubled …
when we observed stars from the Earth, we noticed that almost all of the light emitting from the stars was being shifted to the red end of the spectrum. This …
A volt is a joule per coulomb.If you're struggling to remember try and picture the situation. Imagine current as individual units of charge passing through a battery. The charge has …
As voltage increases across the filament, the current also increases. The increase in current causes the temperature in the filament to rise. The increase in temperature causes the resistance within …
as the potential difference increases, the current increases (ohm's law). this causes the temperature of the filament to increase, causing the resistance to increase.
Firstly, we want to define what information we know from the question: ∆Q = 18000C; ∆t = 300s, P = 13.8kWTherefore, to calculate the resistance we can use the …
At the centre of the atom, is the nucleus. This is made up of protons and neutrons. Protons are positively charged, with a relative charge of +1. Whilst neutrons are …
EM waves invariantly travel at the speed of light, and can do so in a vacuum. They transfer energy from their source to the absorber. Some kinds of EM waves …
Firstly, energy transfers happen step by step. Almost all energy on Earth comes from the Sun. The Sun causes plants to photosynthesise so the energy becomes chemical energy in your …
The voltage (or potential difference) between two points is the cost in energy to move a unit of positive charge from the point of lower potential to the point …
Weight and mass are related to each other, but not the same thing. When you step onto a weighing scale and it gives you a number (this could be in …
The law of conservation of energy states that energy cannot be created or destroyed it can only be transferred from one form to another. An example of this is when …