Tag Archives: math

Projectile motion!! help!! eaxy math!?

Posted on March 29, 2012 by admin| 1 Comment

#1) The height of the projectile fired upward is given by the formula s=Vot-16t ^2, where s is the height and Vo is the initial velocity and t is time. Find time for a projectile to return to Earth if it has velocity of 200ft/s.

I know in this one, i solve for t, but distance would I use for s?

#2) . In Germany, there are no speed limits on some portions of highway. Others have a speed limit of 180 km/h (approximately 112 mph.) required to stop a car traveling at v kilometers per hour is d=0.019v^2+0.69v. Approximate to nearest tenth.

I don’t get this one at all!!

#3) A model rocket is launched with an intial velocity of 200ft/s. The height h, of the rocket t seconds after the launch is given by h= -16ft^+200t. How many seconds after launch will rocket be 300 ft above ground? Round nearest hundredth of a sec.

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Posted in Model Rockets

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projectile motion physics and easy math question!!?

Posted on March 28, 2012 by admin| 2 Comments

#1) The height of the projectile fired upward is given by the formula s=Vot-16t ^2, where s is the height and Vo is the initial velocity and t is time. Find time for a projectile to return to Earth if it has velocity of 200ft/s.

I know in this one, i solve for t, but distance would I use for s?

#2) . In Germany, there are no speed limits on some portions of highway. Others have a speed limit of 180 km/h (approximately 112 mph.) required to stop a car traveling at v kilometers per hour is d=0.019v^2+0.69v. Approximate to nearest tenth.

I don’t get this one at all!!

#3) A model rocket is launched with an intial velocity of 200ft/s. The height h, of the rocket t seconds after the launch is given by h= -16ft^+200t. How many seconds after launch will rocket be 300 ft above ground? Round nearest hundredth of a sec.

#4) A diver jumps from a platform that is 10 m high. The height of the diver t seconds after the beginning of the dive is given by h= -4.9t^2+3.2t +10.5.

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Posted in Model Rockets

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Math Help!!!!!!!!!!!!<3 again LMAO?

Posted on March 24, 2012 by admin| 5 Comments

1)Rolex Smudge was figuring out his federal income tax. His income was 32,900 , but he was able to subtract 6,400 in deductions. He paid 18% of the remaining income tax. How muh did he pay?

2)The saturn rocket is 110.6 m tall. A model of the saturn 5 rocket is 3.4 m tall. The model height is what precent of the actual height?

3)The regular price of a Space Invader game is $52, but it is on sale. The discount is $13. What percent discount is this?

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Posted in Model Rockets

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Is it normal for a 15 year old to cry about petty insults, set RC cars on fire, etc….?

Posted on February 2, 2012 by admin| 16 Comments

Some of you might remember I’ve posted about this guy before. He’s a fresshie’ in my math class and today he started crying because he didn’t know how to awnser a math question on the board! Then some kid on the bus said fresshies’ suck so he started crying there! He also follows me around and talks about bizzare things like seting things on fire and stealing trucks! Like today he was rambling on about how he sets his RC cars on fire and watches the batteries explode! And every time a construction worker drives a cart by (our school’s under reconstruction) he says he want’s to steal it! Is this common? I don’t know anyone else like this but do you?
(Also today he was sitting nxt to me and everytime he got up or down he touched my leg! I don’t think he’s gay, but I don’t know!)
By the way, do you know how I can get ride of him without hurting his fellings?
(Anything the SLIGHTEST bit rude will make him cry, so DON”T suggest that!)
Well, it’s not just batteries. He seems to alaways be talking about dowsing something in gasoline and igniting it! I don’t know if he auctually does everyhting he does, I get the impression that he just says he does it cause’ he thinks it will make him fit in more and fell tougher!

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Posted in RC Trucks

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Do you have the math skills to solve this? I got it on a test.?

Posted on December 30, 2011 by admin| 15 Comments

A model rocket is launched straight upward with an initial speed of 46 m/s. It accelerates with an constant upward acceleration of 2.21 m/s^2 until its engines stop at an altitude of 160.7 m.

What is the maximun height reached by the rocket?

How long after lift-off does it maximum height?

How long is the rocket in the air?
m/s is meter per second.
m/s^2 is meter per second squared.
The starting point is ground level.
Bob. I’m not talking about the size of the model rocket.
By “How long is the rocket in the air?”, I obviously mean how much TIME it’s in the air.

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Posted in Model Rockets

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More help and i thank you..math…?

Posted on December 20, 2011 by admin| 2 Comments

A model rocket is shot into the air and its path is approximated by hI=-5t²+30t, where h is the height of the rocket above the ground in metres and t is the elapsed time in seconds

1.draw a diagram that models this situation
2.when will the rocket hit the ground
3.what is the maximum height of the rocket

thanks again. also if you have some tips on sites that could help me with this, i’d appreciate it…

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I need help with this math question?

Posted on October 9, 2010 by admin| 1 Comment

The height h (in feet), of a rocket , t seconds after it takes off can be modeled by -2t^(2)+12t+14=h

After how many seconds will the rocket have height of 32?

How many seconds after take off will the rocket come back to the ground?

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