Stress= F (weight of masses applied: (mass x 9.81)) / A (using your value for d from question before)
Strain= Extension (from a previous question) / Original length (given in the question).
Divide your Stress Value by your strain value.
I made a dumb mistake on the zero error for the diameter question before, but I hope they will only penalize me in that question and award me
In trying to manage my time I completely forgot to times the mass by gravity to get the force. Did everything else right though. In the end I guessed the last 5 MCQ How many marks will I get ou of 4 for Youngs Modulus. 2/4?.
Yeah but kWh is not a standard unit of power so i got 278 W
kWh is not a unit of power at all, it is a unit of energy (equal to 3600000 or 3.6x10^6 Joules). It is on the syllabus since it is the unit of energy which is used when referring to energy used in the home (so your electricity bill says how many 'units' of energy you used, which is just the number of kWh).
Our teacher only went through it a couple of weeks ago because it was something that doesn't really fit in anywhere to the lessons but we just have to know and understand.
kWh is not a unit of power at all, it is a unit of energy (equal to 3600000 or 3.6x10^6 Joules). It is on the syllabus since it is the unit of energy which is used when referring to energy used in the home (so your electricity bill says how many 'units' of energy you used, which is just the number of kWh).
Our teacher only went through it a couple of weeks ago because it was something that doesn't really fit in anywhere to the lessons but we just have to know and understand.
There is no debate on this questions answer... the units were given in KW by the exam board themselves in the answer space... it was just dividing by hours in a year to get KW... end of story.
There is no debate on this questions answer... the units were given in KW by the exam board themselves in the answer space... it was just dividing by hours in a year to get KW... end of story.
ok , thanks , i will probably get a method mark out of 3 marks available
There is no debate on this questions answer... the units were given in KW by the exam board themselves in the answer space... it was just dividing by hours in a year to get KW... end of story.
I thought that the units in the answer box were W not kW? That's really annoying if they were wanting it in kW because I definitely wrote 114W in my working and then put 114 on the answer line.
I thought that the units in the answer box were W not kW? That's really annoying if they were wanting it in kW because I definitely wrote 114W in my working and then put 114 on the answer line.
I am reasonably confident that the answer was supposed to be in W - It's what I put it as anyway! And also, I did the same calculation as kWh is not a standard unit of power, giving me 114W
I am reasonably confident that the answer was supposed to be in W - It's what I put it as anyway! And also, I did the same calculation as kWh is not a standard unit of power, giving me 114W
how many marks will i get for getting 278W , i divided by 3600 because i accidentally missed out the year bit
Was the question out of 3 marks? If so probably about 2 of them marks? Honestly that is just a guess though! I made some bad mistakes earlier on with the zero error and the very first question, along with some of the multiple choice Q's...