Friday
October 31, 2014

Homework Help: physics (please check work)

Posted by Diane on Sunday, December 10, 2006 at 1:32pm.

A uniform rod AB is 1.2 m long and weighs 16N. It is suspended by strings AC and BD. A block P weighing 96N is attached at E, 0.30N from A. The tension force in the string BD has a magnitude.

My work:
Taking torque around AC string
clockwise=counterclockwise
block P + Board force down= BD tension
(0.3m * 96N)+ (.6m * 16N)= BD (1.2m)
38.4= BD(1.2m)
BD= 32N

An 800N man stands halfway up a 5.0m long ladder of negligible weight. The base of the ladder is 3.0m from the wall. Assuming that the wall-ladder contact is frictionless, the wall pushes against the ladder with a force magnitude of:

my work:

cos (theta) = 3m/5m
theta= 53.13 degrees

horizontal components
Ff (friction foce on bottom) - FN (normal force on top) = 0

Ff=FN

vertical components:
Torque taken from top point of ladder
clockwise= counterclockwise
(800N X 2.5X cos(53.1))= FN(5)
FN=240N

Thank you

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Physics questions ( I posted all my work) - A uniform rod AB is 1.2 m long and ...
Physics - a uniform rod of 3 kg and length 1 m is suspended from a fixed point ...
Physics - The sketch shows a mobile in equilibrium. Each of the rods is 0.16 m ...
phy - 1. A Uniform rod AB 3m long weighing 3 Kg is held horizontally by two ...
Physics - A uniform rod 8m long weighing 5kg is supported horizontally by two ...
Physics - A 1.34‒kg ball is attached to a rigid vertical rod by means of ...
physics - A decorative piece consists of a 20cm long uniform brass rod weighing ...
Physic - Can some one help me with this question. A uniform 119.0 cm long, 78.0 ...
physics - a 1.29 kg ball is connected by means of two massless strings to a ...
Science - MOMENTS A uniform rod 8m long weighing 5kg is supported horizontally ...

Search
Members