Jump to content

Can someone please tell me why I got this wrong? (Maths)

MrTomnus
By MrTomnus
in Off Topic
 Share
Posted

I have my maths mechanics exam tomorrow, and I've been doing some practice questions. I swear I did this one properly but I can't figure out what I did wrong... I bet it's something stupid like a negative error that I can't find.

 

Can anyone help? Here's the question, answer and my working:

EDIT: Solved.

 

post-42902-0-18876200-1401973626_thumb.p

post-42902-0-87882500-1401973644_thumb.j

post-42902-0-78029900-1401973627_thumb.p

| My first build: http://linustechtips.com/main/topic/117400-my-very-first-build/ | Build for my friend's 18th: http://linustechtips.com/main/topic/168660-pc-for-my-friends-18th-with-pictures-complete/ |


ATH-M50X Review: http://linustechtips.com/main/topic/165934-review-audio-technica-ath-m50-x/ | Nintendo 3DS XL Review: http://linustechtips.com/main/topic/179711-nintendo-3ds-xl-review/ | Game Capture Guide: http://linustechtips.com/main/topic/186547-ultimate-guide-to-recording-your-gameplay/


Case: Corsair 200R CPU: i5 4670K @ 3.4GHz RAM: Corsair 8GB 1600MHz C9 Mobo: GIGABYTE Z87-HD3 GPU: MSI R9 290 Cooler: Hyper 212 EVO PSU: EVGA 750W Storage: 120GB SSD, 1TB HDD Display: Dell U2212HM OS: Windows 8

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Math? Dude this is the stuff I do in physics...

NEW PC build: Blank Heaven   minimalist white and black PC     Old S340 build log "White Heaven"        The "LIGHTCANON" flashlight build log        Project AntiRoll (prototype)        Custom speaker project

Spoiler

Ryzen 3950X | AMD Vega Frontier Edition | ASUS X570 Pro WS | Corsair Vengeance LPX 64GB | NZXT H500 | Seasonic Prime Fanless TX-700 | Custom loop | Coolermaster SK630 White | Logitech MX Master 2S | Samsung 980 Pro 1TB + 970 Pro 512GB | Samsung 58" 4k TV | Scarlett 2i4 | 2x AT2020

 

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

Never mind, I found it... It was a negative error on the fourth line :/ ugh, I would have lost four marks for that in the exam... 

| My first build: http://linustechtips.com/main/topic/117400-my-very-first-build/ | Build for my friend's 18th: http://linustechtips.com/main/topic/168660-pc-for-my-friends-18th-with-pictures-complete/ |


ATH-M50X Review: http://linustechtips.com/main/topic/165934-review-audio-technica-ath-m50-x/ | Nintendo 3DS XL Review: http://linustechtips.com/main/topic/179711-nintendo-3ds-xl-review/ | Game Capture Guide: http://linustechtips.com/main/topic/186547-ultimate-guide-to-recording-your-gameplay/


Case: Corsair 200R CPU: i5 4670K @ 3.4GHz RAM: Corsair 8GB 1600MHz C9 Mobo: GIGABYTE Z87-HD3 GPU: MSI R9 290 Cooler: Hyper 212 EVO PSU: EVGA 750W Storage: 120GB SSD, 1TB HDD Display: Dell U2212HM OS: Windows 8

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

Ugh Trigo....

Yeah, trig can be so confusing sometimes :(

 

Math? Dude this is the stuff I do in physics...

Really? Fair enough. There is a small bit of physics in mechanics like moments and impulse, but I don't learn things like inclined plane or centre of mass in physics.

| My first build: http://linustechtips.com/main/topic/117400-my-very-first-build/ | Build for my friend's 18th: http://linustechtips.com/main/topic/168660-pc-for-my-friends-18th-with-pictures-complete/ |


ATH-M50X Review: http://linustechtips.com/main/topic/165934-review-audio-technica-ath-m50-x/ | Nintendo 3DS XL Review: http://linustechtips.com/main/topic/179711-nintendo-3ds-xl-review/ | Game Capture Guide: http://linustechtips.com/main/topic/186547-ultimate-guide-to-recording-your-gameplay/


Case: Corsair 200R CPU: i5 4670K @ 3.4GHz RAM: Corsair 8GB 1600MHz C9 Mobo: GIGABYTE Z87-HD3 GPU: MSI R9 290 Cooler: Hyper 212 EVO PSU: EVGA 750W Storage: 120GB SSD, 1TB HDD Display: Dell U2212HM OS: Windows 8

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Really? Fair enough. There is a small bit of physics in mechanics like moments and impulse, but I don't learn things like inclined plane or centre of mass in physics.

 

Ugh, this is what I have to look forward to next year :(

Pilates

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

Ugh, this is what I have to look forward to next year :(

It's not that bad, honestly. Once you learn the concepts, you are able to apply knowledge very easily. What I have trouble with is trying to do the simple things (like getting signs right) when I'm concentrating on the difficult things like differentiating and integrating things like ln(x) and e^x. That where I lose my marks, and it sucks, because I know I can do all of it, but I don't have as much time in the exam to go through and check everything again :(

| My first build: http://linustechtips.com/main/topic/117400-my-very-first-build/ | Build for my friend's 18th: http://linustechtips.com/main/topic/168660-pc-for-my-friends-18th-with-pictures-complete/ |


ATH-M50X Review: http://linustechtips.com/main/topic/165934-review-audio-technica-ath-m50-x/ | Nintendo 3DS XL Review: http://linustechtips.com/main/topic/179711-nintendo-3ds-xl-review/ | Game Capture Guide: http://linustechtips.com/main/topic/186547-ultimate-guide-to-recording-your-gameplay/


Case: Corsair 200R CPU: i5 4670K @ 3.4GHz RAM: Corsair 8GB 1600MHz C9 Mobo: GIGABYTE Z87-HD3 GPU: MSI R9 290 Cooler: Hyper 212 EVO PSU: EVGA 750W Storage: 120GB SSD, 1TB HDD Display: Dell U2212HM OS: Windows 8

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

It's not that bad, honestly. Once you learn the concepts, you are able to apply knowledge very easily. What I have trouble with is trying to do the simple things (like getting signs right) when I'm concentrating on the difficult things like differentiating and integrating things like ln(x) and e^x. That where I lose my marks, and it sucks, because I know I can do all of it, but I don't have as much time in the exam to go through and check everything again :(

 

I've got my additional maths FSMQ exam tomorrow, I'm finding that quite challenging. Next year it's physics, maths with mechanics, chemistry and music tech for A level. Tbh Music tech is the only one I'm looking forward to.

Pilates

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

I've got my additional maths FSMQ exam tomorrow, I'm finding that quite challenging. Next year it's physics, maths with mechanics, chemistry and music tech for A level. Tbh Music tech is the only one I'm looking forward to.

Well good luck with it! The FSMQ will really help you in A level. I wish I had the option to do it... Sounds like a nice mix, but that's a lot of maths you'll be doing! Instead of chemistry, I picked biology because it's less about equations and more about how things work, which is cool. What I didn't anticipate was that you had to remember how EVERYTHING works in the exams :(

| My first build: http://linustechtips.com/main/topic/117400-my-very-first-build/ | Build for my friend's 18th: http://linustechtips.com/main/topic/168660-pc-for-my-friends-18th-with-pictures-complete/ |


ATH-M50X Review: http://linustechtips.com/main/topic/165934-review-audio-technica-ath-m50-x/ | Nintendo 3DS XL Review: http://linustechtips.com/main/topic/179711-nintendo-3ds-xl-review/ | Game Capture Guide: http://linustechtips.com/main/topic/186547-ultimate-guide-to-recording-your-gameplay/


Case: Corsair 200R CPU: i5 4670K @ 3.4GHz RAM: Corsair 8GB 1600MHz C9 Mobo: GIGABYTE Z87-HD3 GPU: MSI R9 290 Cooler: Hyper 212 EVO PSU: EVGA 750W Storage: 120GB SSD, 1TB HDD Display: Dell U2212HM OS: Windows 8

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Well good luck with it! The FSMQ will really help you in A level. I wish I had the option to do it... Sounds like a nice mix, but that's a lot of maths you'll be doing! Instead of chemistry, I picked biology because it's less about equations and more about how things work, which is cool. What I didn't anticipate was that you had to remember how EVERYTHING works in the exams :(

 

Maths is my last exam this year so I am pretty relieved about that. Next year will be turmoil though lol

Pilates

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Yeah, trig can be so confusing sometimes :(

 

Really? Fair enough. There is a small bit of physics in mechanics like moments and impulse, but I don't learn things like inclined plane or centre of mass in physics.

Really?

 

I studied that at Physics not Maths.

 

This is very easy compared to what I had to solve a year ago at a contest.They gave us grade 12 problems,even though we were only in the 7th grade.The biggest score/mark/whatever was 2.5 out of 32. (4 problems worth 8 points each).I got 2 points back then.

i5 4670k @ 4.2GHz (Coolermaster Hyper 212 Evo); ASrock Z87 EXTREME4; 8GB Kingston HyperX Beast DDR3 RAM @ 2133MHz; Asus DirectCU GTX 560; Super Flower Golden King 550 Platinum PSU;1TB Seagate Barracuda;Corsair 200r case. 

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Oh god, this is similar to my physics exam that I've got on Monday. And I do mechanics in maths next year (if I carry it on, you may have just made my mind up). Good luck for your exam tomorrow.

PCs

Spoiler
Spoiler

Branwen (2015 build) - CPU: i7 4790K GPU:EVGA GTX 1070 SC PSU: XFX XTR 650W RAM: 16GB Kingston HyperX fury Motherboard: MSI Z87 MPower MAX AC SSD: Crucial MX100 256GB + Crucial MX300 1TB  Case: Silverstone RV05 Cooler: Corsair H80i V2 Displays: AOC AGON AG241QG & BenQ BL2420PT Build log: link 

Spoiler

Netrunner (2020 build) - CPU: AMD R7 3700X GPU: EVGA GTX 1070 (from 2015 build) PSU: Corsair SF600 platinum RAM: 32GB Crucial Ballistix RGB 3600Mhz cl16 Motherboard: Gigabyte Aorus X570i pro wifi SSD: Sabrent Rocket 4.0 1TB Case: Lian Li TU150W black Cooler: Be Quiet! Dark Rock Slim

 

Link to comment
Share on other sites
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing Off Topic

×