# Physics, Efficiency Question 2Watch

#1
Hello future scientists would any one of you teach me how to answer the phsyics questions 23 and 24 on this bmat paper? x

0
4 years ago
#2
(Original post by Swtmess)
Hello future scientists would any one of you teach me how to answer the phsyics questions 23 and 24 on this bmat paper? x

Better to start a new thread for a new question.

The gain in gravitational potential energy from squirting a 5kg jet of water 5m upwards for 1 second is the same as if it was a (massless) bucket with 5kg of water and you pulled it upwards 5m by a rope attached to the handle in one second.

calculate the change in GPE for 1 second worth of water. since power in watts is change in energy level per second this will be your pumps power output.

you can calculate the nozzle velocity of the jet using a SUVAT or by doing a conservation of energy (because all the KE of the jet is being converted to GPE as the water ascends)
0
4 years ago
#3
(Original post by Swtmess)
Hello future scientists would any one of you teach me how to answer the phsyics questions 23 and 24 on this bmat paper? x
(Original post by Joinedup)
Better to start a new thread for a new question.
Done - new thread started for you.

Q24 is more maths than physics, but you solve it by finding an expression for the hypotenuse (squared) of the triangle which is now the side of the new square. (Use Pythogaras)
Then repeat this 3 more times (answer to the power 3) to get the value for the 4th square.
#4
(Original post by Stonebridge)
Done - new thread started for you.

Q24 is more maths than physics, but you solve it by finding an expression for the hypotenuse (squared) of the triangle which is now the side of the new square. (Use Pythogaras)
Then repeat this 3 more times (answer to the power 3) to get the value for the 4th square.
Thank you so much xx

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