Don't you need calculus to solve this?
Um, you don't if you know the equation. There is also a trick of geometry (for cases like this) that will let you avoid the calculus.
eta: I think. There is for one part of question 2, at least.
Xander: Hey, Red. What you got in the basket, little girl? Buffy: Weapons.
Xander/Buffy ,'Help'
Natter 53: We could just avoid making tortured puns
Off-topic discussion. Wanna talk about corsets, duct tape, or physics? This is the place. Detailed discussion of any current-season TV must be whitefonted.
tommyrot - Sep 07, 2007 6:12:39 am PDT #9014 of 10001
Sir, it's not an offence to let your cat eat your bacon. Okay? And we don't arrest cats, I'm very sorry.
Vortex - Sep 07, 2007 6:13:25 am PDT #9015 of 10001
"Cry havoc and let slip the boobs of war!" -- Miracleman
1) You are driving a car, and you accelerate from 0 to 25 mph. Say the amount of energy required is x. Now you continue to accelerate from 25 mph to 50 mph. What is the total amount of energy you used to accelerate from 0 to 50 mph?
I think that it's 2X, because you can't just go from 25 to 50.
2) You drop a heavy object from a height of 10 feet, and when it hits the ground it has a velocity of y. What would be the velocity if you drop it from 20 feet? From 40 feet?
still y. (9.8 meters per second)
Steph L. - Sep 07, 2007 6:13:45 am PDT #9016 of 10001
the hardest to learn / was the least complicated
Isn't it always y, no matter the height?
Hint: No. Ignoring issues of air friction, a falling object will continue to accelerate, so the farther it falls, the faster it will be going when it reaches the ground.
Curses! Physics triumphs over Tep!Intuition yet again!
Vortex - Sep 07, 2007 6:14:08 am PDT #9017 of 10001
"Cry havoc and let slip the boobs of war!" -- Miracleman
Would it be weird to close my office door so I could chair-dance to Rage Against the Machine?
leave door open. own it.
tommyrot - Sep 07, 2007 6:15:38 am PDT #9018 of 10001
Sir, it's not an offence to let your cat eat your bacon. Okay? And we don't arrest cats, I'm very sorry.
still y. (9.8 meters per second)
You're thinking of acceleration due to gravity, which is 9.8 meters per second² (or 9.8 meters per second per second. The first "per second" is the velocity, the second is how much the velocity increases each second.)
Dana - Sep 07, 2007 6:15:59 am PDT #9019 of 10001
"I'm useless alone." // "We're all useless alone. It's a good thing you're not alone."
leave door open. own it.
Ha ha ha. No.
Vortex - Sep 07, 2007 6:17:16 am PDT #9020 of 10001
"Cry havoc and let slip the boobs of war!" -- Miracleman
You're thinking of acceleration due to gravity, which is 9.8 meters per second² (or 9.8 meters per second per second. The first "per second" is the velocity, the second is how much the velocity increases each second.)
Hey, I remembered something from physics. I say go, me.
meara - Sep 07, 2007 6:19:37 am PDT #9021 of 10001
Well, it depends on the object, doesn't it? Some reach terminal velocity. Like cats, falling out of a window. They're safer falling from higher stories, because they reach terminal velocity and have a chance to right themselves before hitting ground.
tommyrot - Sep 07, 2007 6:21:42 am PDT #9022 of 10001
Sir, it's not an offence to let your cat eat your bacon. Okay? And we don't arrest cats, I'm very sorry.
Well, it depends on the object, doesn't it? Some reach terminal velocity. Like cats, falling out of a window. They're safer falling from higher stories, because they reach terminal velocity and have a chance to right themselves before hitting ground.
Yeah. Except the terminal velocity is due to wind friction. Which we're ignoring here (but I suppose ignoring wind friction would make the question less intuitive.)
Anyway, I'm gonna start answering the questions. What will take more time is explaining the answers.
bon bon - Sep 07, 2007 6:23:15 am PDT #9023 of 10001
It's five thousand for kissing, ten thousand for snuggling... End of list.
Are they of specific department stores?
I don't think so. I believe at least some, if not most, of their stock is direct from manufacturers.