Physics Help Forum Newtons second law

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Oct 20th 2008, 05:14 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?
Oct 20th 2008, 05:24 PM   #2
Senior Member

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.

 Tags law, newtons

 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post kinhew93 Kinematics and Dynamics 14 Sep 6th 2013 09:04 PM FlexedCookie Kinematics and Dynamics 9 Mar 1st 2011 01:39 PM amandamolegirl Kinematics and Dynamics 1 Feb 21st 2009 08:56 PM amiv4 Kinematics and Dynamics 0 Feb 2nd 2009 02:40 PM Morgan82 Kinematics and Dynamics 1 Oct 23rd 2008 09:59 AM