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Hi Kayscience, I believe there is a mistake at 4:19 when the polyester is drawn, as the total number of oxygens doesnt add up. On the left there are 6 oxygens, whilst on the right there are 7 oxygens. Hence, I think the polyster drawn on the RHS should have on less oxygen (which could be taken off from the left or right side of the molecule, I believe). Many thanks
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A toy uses a spring to shoot an arrow with a suction cup on the end. The toy shoots a 34.2 g arrow and gives it a speed of 5.50 m/s. If the efficiency of the toy is 69.0%, how much elastic potential energy was stored in the spring? Show all your work. Can you help solve this
When the arrow is shot, 69% of all energy in the elastic potential energy (EE) store gets converted to kinetic energy (KE). Therefore, 0.69*EE=KE. The formula for KE=½mv² so 0.69*EE=½mv². m=34.2g=0.0342kg and v=5.5m/s so with substitution, 0.69*EE=½(0.0342)(5.5)². Simplifying this: 0.69*EE=½(0.0342)(5.5)² EE=(½(0.0342)(5.5)²)/0.69 EE=0.0342(5.5)²/1.38 Calculator; EE=0.7496’7391304347826086956521’J (‘x’ means recurring) EE≈0.750J (3 significant figures) I may be a little bit late, but hope this helps! Let me know if I made a mistake.
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This is actually the best explanation I've come across so far.
Thank yoooou!
2 weeks to go until your GCSE exams!!!! Get ready for them using our free sessions. Next one is tonight at 6.45pm and you can reserve your place now using this link:
www.lighthall.co/class/7643b67e-5ecf-491a-b43d-940d6214f010
Hi Kayscience, I believe there is a mistake at 4:19 when the polyester is drawn, as the total number of oxygens doesnt add up. On the left there are 6 oxygens, whilst on the right there are 7 oxygens. Hence, I think the polyster drawn on the RHS should have on less oxygen (which could be taken off from the left or right side of the molecule, I believe).
Many thanks
Yes I think so too, thanks for bringing it up
Thanks for this video!
so useful please make more videos in this same style
we have lots more at kayscience.com :)
Please sign up to a free KayScience account at www.kayscience.com and get all quizzes for free OR you can use the code online50 to get 50% off access to ALL our KaySccience videos!
very appreciated (:
Good explanation
TYSM
A toy uses a spring to shoot an arrow with a suction cup on
the end. The toy shoots a 34.2 g arrow and gives it a speed of
5.50 m/s. If the efficiency of the toy is 69.0%, how much elastic
potential energy was stored in the spring? Show all your work.
Can you help solve this
no, sorry.
When the arrow is shot, 69% of all energy in the elastic potential energy (EE) store gets converted to kinetic energy (KE). Therefore, 0.69*EE=KE. The formula for KE=½mv² so 0.69*EE=½mv². m=34.2g=0.0342kg and v=5.5m/s so with substitution, 0.69*EE=½(0.0342)(5.5)². Simplifying this:
0.69*EE=½(0.0342)(5.5)²
EE=(½(0.0342)(5.5)²)/0.69
EE=0.0342(5.5)²/1.38
Calculator; EE=0.7496’7391304347826086956521’J (‘x’ means recurring)
EE≈0.750J (3 significant figures)
I may be a little bit late, but hope this helps! Let me know if I made a mistake.