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Physics Question

Can someone answer a few questions of mine before my exam tomorrow?

June 18, 2014

12 Comments • Newest first

LowWillpower

[quote=Symphs]http://oi61.tinypic.com/23hrpr4.jpg

Also, what do I even do with the Fnormal?

@Rationalism

Okay, if 120 is the initial height... I'll have:

y=1/2 (-9.81) t^2 + 7.72 + 120
y= -4.91 t^2 + 127.72
Will my step process be:
-127.72= -4.91 t^2
26.01= t^2
5.1= t

?[/quote]
Fnormal counters fg.

Reply June 19, 2014
Symphs

[quote=pascalio95]1) No clue what you're asking.

2) Yes, acceleration can be negative.

3) Break down velocity into components, and use kinematics formulas and the velocity in the y-direction to find time.

4) Tension would be inclined also, but tension is also a force, so it can also be broken into x and y components.

5) Period seems correct. Yes, frequency is 1/period.

Have fun! [/quote]

http://oi61.tinypic.com/23hrpr4.jpg

Also, what do I even do with the Fnormal?

@Rationalism

Okay, if 120 is the initial height... I'll have:

y=1/2 (-9.81) t^2 + 7.72 + 120
y= -4.91 t^2 + 127.72
Will my step process be:
-127.72= -4.91 t^2
26.01= t^2
5.1= t

?

Reply June 19, 2014 - edited
Rationalism

[quote=Symphs]Even though it's moving on a surface?[/quote]

Sorry I should really say which one I'm talking about cause I have no idea what you're referring to. I was talking about the third diagram. the tension would be pointing northwest from the box.

Yea 120 is the initial height.

Reply June 19, 2014 - edited
pascalio95

1) No clue what you're asking.

2) Yes, acceleration can be negative.

3) Break down velocity into components, and use kinematics formulas and the velocity in the y-direction to find time.

4) Tension would be inclined also, but tension is also a force, so it can also be broken into x and y components.

5) Period seems correct. Yes, frequency is 1/period.

Have fun!

Reply June 19, 2014 - edited
Symphs

[quote=Rationalism]Acceleration can be negative. I'll keep updating...

The tension is vertical because gravity is pulling it down.[/quote]

Even though it's moving on a surface?

*Edit* Wait what, initial height? Is that 120?

so.. y= 1/2 (-9.81) t^2 + (7.72(Viy)) + 120?

Reply June 19, 2014 - edited
Rationalism

Acceleration can be negative. I'll keep updating...

The tension is vertical because gravity is pulling it down.

Plug the info into the projectile motion formula.

y = (1/2)at^2 + initial velocity + initial height

y = height

Reply June 19, 2014 - edited
Symphs

@Cherma
@mitarumetaro
@Avatar
@gatotsuwolf
@SoIntoYou

http://oi58.tinypic.com/2wn3b5u.jpg

First one is a bit hard to see. ''Can we still use elimination to get rid of tension, so I can isolate a, even though we're dealing with two different components?''

Reply June 19, 2014 - edited
gatotsuwolf

http://i.imgur.com/lyWwytV.jpg

Reply June 18, 2014 - edited
Avatar

What kind of questions?

Reply June 18, 2014 - edited
SoIntoYou

^ lol =p

So.. what are your questions? o_0

Reply June 18, 2014 - edited
Chema

Yes, someone can

Reply June 18, 2014 - edited