Tension in string Definition and 43 Threads

[Mentor Note -- thread moved from the schoolwork forums to GD as it seems like a more general question] Homework Statement:: Topoisomerases help in relieving strain in the DNA ahead of the replication fork caused by the untwisting of the double helix (Topoisomerases are enzymes that...

F - T = m*a 820t - T = m*0.7805t T = 820t - m*0.7805t I am confused what I would use as mass? Mass of cart A, or mass of cart A and tractor?

Variables: Dependent: Vibrational frequency of violin string (Measured using mobile tuning app) Independent: Temperature in which string is plucked (Measured using infrared thermometer) Controlled: Violin String, Tension of violin string, Length of violin string, Method of plucking...

so I took string below point A and Block as a system. Taking mass of string below point A as m and mass of block M. Taking downward direction as X axis. I get Mg+mg-T, Taking T as tension by upward part of string. Now the question says about block descending with acceleration a. so again forces...

Homework Statement We have to find T1 and T2 From right to left objects are: A B C Homework Equations F=ma The Attempt at a Solution Okay. So I found acceleration of whole system: F=ma 200N= (20+10+5)*a 200/35=a a= 40/7 ms-2 Now, finding T1 is fairly simple: f=ma T1=5*(40/7) T1=200/7 Newtons...

Homework Statement Hello, I am currently studying mathematics and physics on my own, and I ran into a type of problem in physics that is a bit unclear to me. Say we have pulley at the top of an inclined plane with a base angle of alpha and the top angle is alpha. Homework Equations I assume...

Homework Statement A grid made of ropes is suspended by its four corners with strings tied to four different points on a building. Three of which are fixed and fourth is attached to a pulley which is in turn fixed to the building. Given data : Grid mass is 25 kilogram suspended at a height of...

Homework Statement The tension between the 6 kg and 4 kg object as=2.1m/s Fnet = 40N assume 0.4 kinetic friction coefficent Homework Equations T1- Fnet = mas The Attempt at a Solution acceleration is negative because the object is decelerating as it goes up the slope so T1-40N = 6(-2.1) T1 =...

Homework Statement A child is swinging a .325 kg ball at the end of a .74 m long string in a vertical circle. string can withstand a tension of 12 N before breaking. What is the tension in the string when the ball is at the top of the circle if its speed at that point is 3.4 m/s? Homework...

Homework Statement An object at rest is suspended from two strings (A and B) as shown in the diagram, with A shorter than B. The object pulls on the point O with a force of 20 N. Each of the strings also exerts a force on the Point O. The angle between the strings at O is 90o. Which of the...

Homework Statement ------------------------------------- |.\ |...\ |...\ |...\ Q...O P O=the bob Teta=60 degree The bob of a simple pendulum is released from rest at P. The mass of the bob is m and...

Homework Statement Hi all. What concerns me here is that it's worth 10 marks, but the solution I've tried only takes 2 steps. Am I missing some relation between the frame support and the pulley altering the components of the tension, or is the solution really just a basic trig conversion...

Homework Statement Answer True, False, or Cannot tell to each of the five statements below. A small projectile is launched horizontally 1 m above the surface of a smooth, airless planet, with sufficient speed for orbit. A bug riding in a small hole in the projectile has apparent weight...

Homework Statement [/B] Your niece finds her father's watch. The light watch chain has a length of 48 cm, and the mass of the watch is 270 g. Your niece swings the watch in a vertical circle, maintaining the speed of the watch at 2.3 m/s. Find the tension in the chain when it makes an angle of...

Let's say I go to the store and purchase a rope. On the package of string, it says that the string can only withstand 100 Newtons before the rope snaps. I go home and test the tension in the rope. I tell a friend to pull on the rope at 99 Newtons while I pull on the rope with 99 Newtons. Did...

We've got a 0,5m string attached to a frame and has its own fundamental frequency at 440Hz. We cool our system for 15°C. What is the proper frequency now? String length l=0,5m String section S=0,02 mm^2 String density ρ=7800 kg/m^3 Young module E=2*10^5 N/mm^2 Fundamental frequency ν=440Hz ΔT=...

Homework Statement I am stuck on this problem: So the question is asking for F21, F12, F32, and F23. (That's the force by 2 on 1). The mass of m2 is variable. There are four cases where I need to solve for the forces: when m2 has mass of 3kg, 0.3kg, 0.03kg, and 0kg. The mass of m1 = 2.5kg, the...

Homework Statement [/B] A string is wound around a uniform disk of radius ##10cm## and mass ##300g##. The disk is released from rest when the string is vertical and its top end is tied to a fixed bar. Determine the tension in the string. [ ##g = 10 ms^{-2} ##] Homework EquationsThe Attempt at a...

Homework Statement Block 1, of mass m_1 =2.6kg and block 2 of mass m_2=1.4kg are connected by a massless string. Block 2 then experiences a force F=18N acting in the postivive x direction and at an angle of \theta = 38° . The coefficiant of kinetic friction between the floor and both of the...

Homework Statement A fuzzy-dicer makes an angle of θ = 49.6° with respect to the vertical. The mass of the fuzzy dice is 1.0 kg. What is the tension? 2. The attempt at a solution (deleted answer)

Two charged objects of charge q. Coulomb's law states that the force on one sphere by the field of the other is: F = qE But each sphere experiences that, correct? So the tension for the string would be 2F. Is that correct?

Homework Statement Find the tension in string 1 I don't get the same answer as the solution manual. My attempt: The y-component of string 2’s tension must equal the weight of the block. The x-component of string 2’s tension must equal the tension of string 1. T1=T2x=T2y/tanθ =23°...

Homework Statement Two uniformly charged spheres are suspended by strings of length L from vertically adjustable supports. The spheres are in static equilibrium. The angles with respect to the vertical are Q=14.9°, and T=20.7°. The tension in the string supporting sphere Z (Z with respect to...

Homework Statement In the attachment! This is a multiple choice question where you have to choose one of the strings. Intuitively I chose Z as I would think that in the first fraction of time it would feel the force acting on it first. However, if this wasn't a multiple choice I...

Homework Statement Calculate the tension in a 5 m string attached to a 4 kg bob that is moving in horizontal circles of 0.6 m radius. Homework Equations The Attempt at a Solution α= tan-1 0.6/5 = 7 degree T cos α = m*g T= m*g/cosα T=4*9.8/0.12 T=326.6 N I...

Hi all, First of all I'd like to say thank you to you all for providing a great forum which has been a great help to me working through my ics home learning course. As i have learned on here and other places on the internet the information I have in my course materials is not always...

Homework Statement Keys with a combined mass of 0.100 kg are attached to a 0.25 m long string and swung in a circle in the vertical plane. What is the tension in the string at the bottom of the circle? Known: Mass = 0.100 kg Radius = 0.25 m Homework Equations Fc = mv^2/r...

Homework Statement [PLAIN]http://nicholascrumrine.net/otherpics/physics/HW4_6.jpg Homework Equations Sum(F)=MA w=v/r The Attempt at a Solution My assumptions are as follows: The sum of the tensions on the left side of the pulley is equal to the tension in right side of the...

The mass of the ball is m, as given below in kg. It is released from rest. What is the tension in the string (in N) when the ball has fallen through 45o as shown. Hint: First find the velocity in terms of L and then apply Newton's 2nd law in normal and tangential directions. If you do it...

Homework Statement an aluminum object with volume 100 cm^3 and density 2700 kg/m^3 is suspended in ethyl alcohol (density 790) by a string. what's the tension in the string? Homework Equations Fy = Fb + T - mg T = mg - Fb Fb = p_f * v_f * g = p_o * v_o * g The Attempt at a...

This isn't really homework, just doing some revision. Homework Statement Find the tension in each string. Two spheres both of mass, m = 15kg. Diameter of each is 25cm. Each string 35cm long. Spheres are suspended on strings with other end attached to same point on ceiling. Therefore spheres...

Hi, I've got a quick question about tension. If there is a force applied to both ends, the total tension is the sum of those forces, right (i.e., they don't cancel each other out)? TIA!

I have read at many places that tension in the string remains same throught the string. I have a string which is held tight at two ends. It is passing around different rollers. Now, I have small weight hanging on the string at one place. Does this mean that I have same tension throught the...

http://www.mech.uq.edu.au/courses/mech2210/yat/q/swinging_ball.jpg The mass of the ball is m, as given below in kg. It is released from rest. What is the tension in the string (in N) when the ball has fallen through 45o as shown. m[kg] = 3.335 I've used the formulae: v = sqrt[2gL(sin...

I have a ball. It is attached to a wall by a horizontal string to the left. it is attached to the ceiling by another string at an angle theta from the vertical to the right. The ball is not moving. So I worked out that the tension in the upper string is w/(cos theta) , where w is weight. Is...

A rock of mass 200g is attached to a 0.75m long string and swung in a vertical plane. A) what is the speed that the rock must travel so that its weight at the top of the swing is 0? B) what is the tension in teh string at the bottom of the swing? C) if the rock is now moved to a horizontal...

In the attachment given below what will be the tension in string 'A' immediately after the string 'B' is cut. Assume all that the situtation requires.

Hi, Can someone please explain how to do this problem? I really don't understand. A ball is held at rest in position A as shown in the figure by 2 light cords. The horizontal cord is cut and the ball swings as a pendulum. What is the ratio of the tensions in the supporting cord, in position...

Let's say you have a yo-yo that is constructed from two circular masses connected by a small hub. If the radius of the hub is r and the radius of the circular masses is R, how can I find the tension in the string when the yo-yo is released? Assume each circular mass has mass M and the hub is...

A 5.5-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.5 m/s^2 What is the tension in the string?

I'm having trouble with this physics problem: A piece of steel wire (diameter 2mm) is connected between two fixed points. The tension in the wire is 120N at 0 degrees Celcius. At what temperature is the tension 0? I assume that I first have to calculate how much "too short" the string is...

Ok so i have a homework problem again :) This time it's a simple pendulum swing and the question is as follows: "Prove that the tension in the string of a simple pendulum when the string makes an angle \theta with the vertical is approximately mg(1 + \theta^2_0 - (3/2)\theta^2 where m is the...

Two strings are attached to a 5 kg mass. String one is at a 45 degree angle and the other is horizontal. What is the tension in string one?