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/sci/ - Science & Math

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2550706 No.2550706 [Reply] [Original]

/sci/

I have 2 quick Physics problems I could some help with.


A 13 kg child on a playground swing moves with a speed of 3.6 m/s when the 6.0 m long swing is at its lowest point. What is the angle that the swing makes with the vertical when the child is at the highest point?

A 1290 kg roller coaster car starts from rest at a height H = 24.0 m (see figure) above the bottom of a 15.0 m diameter loop. If friction is negligible, determine the downward force of the rails on the car when the upside-down car is at the top of the loop.

>> No.2550753

Do your own homework.<span class="math">\require{HTML} \style{position: fixed; top: 20px; left: 0px; color: red; background: black; font-size: 20pt; font-weight: bold;}{\fbox{ATTENTION: This is /sci/'s last day to shape up before it is removed. ~moot                                                
                                                  
                                                  
                                                  
  }}[/spoiler]

>> No.2550765

>>2550706
Moot is laying down the law.

DELETE EVERYTHING.

>> No.2550786

guess at number 1: all knietic energy gets converted to potential energy so 1/2mv^2 = mgh

the second one is tricky but if you assume the loop is uniform circular motion you could say the force is m*v^2/R minus gravity. you could get the speed at the top maybe using the above equtions for KE

>> No.2550787

>>2550753

I am attemping to.

I can't find velocity on the sector one

>> No.2550792

guess at number 1: all knietic energy gets converted to potential energy so 1/2mv^2 = mgh

the second one is tricky but if you assume the loop is uniform circular motion you could say the force is m*v^2/R minus gravity. you could get the speed at the top maybe using the above equtions for KE

captcha: shall bsume

>> No.2550804 [DELETED] 

lol /sci/ can't do simple physics problems

>> No.2550808
File: 40 KB, 1310x393, temp.png [View same] [iqdb] [saucenao] [google]
2550808

>>2550753
Everyone needs to read the html in this post.

Sage because I'm not sure what's going on.

>> No.2550811

>>2550753
Oh, you bugger.

>> No.2550851
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2550851

>>2550808
>>2550753
Well! False alarm!

>> No.2550853

I got 42.98kN for the second one ....does that seem right?

>> No.2550877

>>2550753
>>2550753
ARE YOU MOOT?

>> No.2550878

>>2550753

everyone report this post so this gets deleted and the guy who posted it gets banned (not like bans do anything)

>> No.2550890

Can some help me find angular moment on


A 13 kg child on a playground swing moves with a speed of 3.6 m/s when the 6.0 m long swing is at its lowest point. What is the angle that the swing makes with the vertical when the child is at the highest point?


Then I should be all set

>> No.2550903

>>2550851
i seriously lol'd

>> No.2550924

a \require{HTML} \style {position: fixed; top: 20px; left:0px; color: red; background: black; font-size:20pt; font-weight: bold;} {\fbox{ATTENTION: buttbutssbutsubtusbtuBUTTS test

}}
dont ban me pls just testing to see if this is how he did it. will delete after it is confirmed

>> No.2550961

>>2550924

confirmed.... now delete it!