Go Back   Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Oct 20th 2008, 06:14 PM   #1
Member
 
Join Date: Sep 2008
Posts: 42
Newtons second law

A crane lifts a shark with a mass of 2.00 x 10^4 kg off the ground. The net is steadily accelerated from rest to 1.0 m/s in a time interval of 2.55 s.

Calculate the magnitude of the tension in the cable pulling the net.

I dont understand. Can someone help?
Morgan82 is offline   Reply With Quote
Old Oct 20th 2008, 06:24 PM   #2
Senior Member
 
arbolis's Avatar
 
Join Date: Apr 2008
Posts: 815
If the shark in the net is not moving in the up/down direction, the magnitude of the tension in the cable is the magnitude of the weight of the shark. That is $\displaystyle mg$. But as there is an acceleration (the shark is getting pulled), the tension in the cable is $\displaystyle m(g+a)$, where a is the acceleration of the net.
So work out
The net is steadily accelerated from rest to 1.0 m/s in a time interval of 2.55 s.
in order to get the acceleration of the shark. Once you get it, plug it into the formula $\displaystyle T_{cable}=m(g+a)$ and you're done.
__________________
Isaac
If the problem is too hard just let the Universe solve it.
arbolis is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Tags
law, newtons



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Newtons 3rd law kinhew93 Kinematics and Dynamics 14 Sep 6th 2013 10:04 PM
Newtons second law FlexedCookie Kinematics and Dynamics 9 Mar 1st 2011 02:39 PM
Please help! Forces and Newtons amandamolegirl Kinematics and Dynamics 1 Feb 21st 2009 09:56 PM
Newtons Law amiv4 Kinematics and Dynamics 0 Feb 2nd 2009 03:40 PM
Newtons Second Law Morgan82 Kinematics and Dynamics 1 Oct 23rd 2008 10:59 AM


Facebook Twitter Google+ RSS Feed