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quick simple physics problem help!

Blogs > mAKiTO
Post a Reply
mAKiTO
Profile Blog Joined December 2002
Colombia4171 Posts
September 23 2008 03:00 GMT
#1
ok i ahd a set of problems on a basic physics class and im stock in one help

problem reads:

A crane lifts a 2000-kg mass upwards. if the tension in the cable is 20,000 N, what is the acceleration of the block?

what I did is use
a= f/m = 20000N/2000 kg = 10m/s square

but the answer says its 0.2m/secs square

I know that if I divided 2000N by 500 and get 400 and then 400N / 2000kg gives me 0.2m/sec square but i dont get why at all lol can someone plz explain this to me

*
No quiero soñar mil veces las mismas cosas
randombum
Profile Blog Joined April 2007
United States2378 Posts
September 23 2008 03:02 GMT
#2
Hi. My name is gravity, if you live on earth I pull you down with nearly constant acceleration of 9.8 m/s^2. In other words I exert 9.8 Newtons of force of on you for every kilogram you weigh.
mAKiTO
Profile Blog Joined December 2002
Colombia4171 Posts
September 23 2008 03:15 GMT
#3
if i multiply the 2000kg by g it gives me 19600

but then what do I do with that number? if I divide by 20000 i still dont get the answer...

im really bad at this lol so dont laugh at me ._.
No quiero soñar mil veces las mismas cosas
IntoTheWow
Profile Blog Joined May 2004
is awesome32274 Posts
September 23 2008 03:18 GMT
#4
[image loading]

[image loading]
Moderator<:3-/-<
Chromyne
Profile Joined January 2008
Canada561 Posts
Last Edited: 2008-09-23 03:21:09
September 23 2008 03:20 GMT
#5
Free body diagrams! They help a lot

Fnet = T + Fg, where T = tension force and Fg is the force of gravity.

Fnet = 20 000N + (-9.81m/s^2)(2000kg)
Fnet = 380 N

Find the acceleration of the block:

F = ma
380 N = (2000kg)(a)
a = 0.19 m/s^2

which is roughly 0.2 m/s^2.
Soli Deo gloria.
mAKiTO
Profile Blog Joined December 2002
Colombia4171 Posts
September 23 2008 03:21 GMT
#6
thank you Agu.. now that I see it like that I get it =D
No quiero soñar mil veces las mismas cosas
mAKiTO
Profile Blog Joined December 2002
Colombia4171 Posts
Last Edited: 2008-09-23 03:22:47
September 23 2008 03:21 GMT
#7
thanks guys <3 i been in college for 2 years and its the first physics class I ever take in my life lol
No quiero soñar mil veces las mismas cosas
IntoTheWow
Profile Blog Joined May 2004
is awesome32274 Posts
September 23 2008 03:28 GMT
#8
No problem.
Moderator<:3-/-<
Chill
Profile Blog Joined January 2005
Calgary25977 Posts
September 23 2008 03:53 GMT
#9
On September 23 2008 12:02 randombum wrote:
Hi. My name is gravity, if you live on earth I pull you down with nearly constant acceleration of 9.8 m/s^2. In other words I exert 9.8 Newtons of force of on you for every kilogram you weigh.

loool
Moderator
Meta
Profile Blog Joined June 2003
United States6225 Posts
September 23 2008 03:57 GMT
#10
On September 23 2008 12:02 randombum wrote:
Hi. My name is gravity, if you live on earth I pull you down with nearly constant acceleration of 9.8 m/s^2. In other words I exert 9.8 Newtons of force of on you for every kilogram you weigh.


I wish I could have said this- thanks for making it funny =)
good vibes only
randombum
Profile Blog Joined April 2007
United States2378 Posts
September 23 2008 04:06 GMT
#11
On September 23 2008 12:57 Meta wrote:
Show nested quote +
On September 23 2008 12:02 randombum wrote:
Hi. My name is gravity, if you live on earth I pull you down with nearly constant acceleration of 9.8 m/s^2. In other words I exert 9.8 Newtons of force of on you for every kilogram you weigh.


I wish I could have said this- thanks for making it funny =)


I'm glad it was funny, but it would've been far better if he managed to get the answer from it. O well, he got the answer soon enough after anyways.
Grobyc
Profile Blog Joined June 2008
Canada18410 Posts
September 23 2008 04:18 GMT
#12
On September 23 2008 12:15 mAKiTO wrote:
if i multiply the 2000kg by g it gives me 19600

but then what do I do with that number? if I divide by 20000 i still dont get the answer...

im really bad at this lol so dont laugh at me ._.

haw haw to you
If you watch Godzilla backwards it's about a benevolent lizard who helps rebuild a city and then moonwalks into the ocean.
Nitrogen
Profile Blog Joined February 2008
United States5345 Posts
September 23 2008 04:34 GMT
#13
On September 23 2008 12:18 IntoTheWow wrote:
[image loading]

[image loading]


that's hot
UNFUCK YOURSELF
capek
Profile Joined September 2008
United States585 Posts
September 23 2008 04:39 GMT
#14
On September 23 2008 12:02 randombum wrote:
Hi. My name is gravity, if you live on earth I pull you down with nearly constant acceleration of 9.8 m/s^2. In other words I exert 9.8 Newtons of force of on you for every kilogram you weigh.

man. why do we need the LHC when we have you
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