Homework Statement
Twelve equal particles of charge ##+q## are equally spaced over a circumference (like the hours in a watch) of radius R. At the center of the circumference is a particle with charge ##+Q##.
a) Describe the net force acting over ##+Q##.
b) If the charge located at...
Today, my class had a dispute between who was right. Two answer keys for this problem was provided, so nobody knows the exact answer to this problem. Half of my class said 100 N while the others said 298 N or something.
We won't talk about how I wasn't listening to that because I was trying to...
When a stream of water falls perfectly vertical, some water hitting the surface will disperse horizontally. What is the force that causes this? References would be awesome!
Could someone explain how to find the net force of an object based on a diagram. For example a 2 people walking with forces labeled weight force, reactant force, thrust and drag on one image all forces are balanced which I know the net force would be zero however on the second image thrust is...
1. The problem is attached in a picture. I've done it five times and keep getting it wrong. The correct answer is also displayed in the picture. Thank you for any help.
2. Fg=Gm_1m_2/r^2
3. I calculated Fg between AB and BC (they are equal). So Fg=(6.67*10^-11)(4)(4)/(.10)^2=1.067*10^-10...
Homework Statement
The two forces F⃗ 1 and F⃗ 2 shown in (Figure 1) act on a 29.0-kg object on a frictionless tabletop. Suppose that F1 = 10.8 N , and F2 = 19 N .
A. Determine the magnitude of the net force on the object for the diagram (a) in the figure.
B.Determine the angle between the...
Homework Statement
Homework Equations
I can see how the net force is not the same but I'm not getting the net moment.
The Attempt at a Solution
12mm x 10N = 120N-mm. How do these two FBDs not have the same net moments.
Thanks for any help!
Homework Statement
A rope attached to a 19.0 kg wood sled pulls the sled up a 19.0° snow-covered hill. A 14.0 kg wood box rides on top of the sled.
EDIT: the actual question to be answered, oops.
What's the magnitude of the tension that will cause the box to slide?
Mass of box (mb) = 14.0kg...
Homework Statement
A point charge of 5.6 microcoulombs is placed at the origin (x=0) of a coordinate system, and another charge of -1.9 microcouloumbs is placed on the x axis at .29m. Where on the axis can a third charge be placed so that it experiences no charge?
q1= 5.6 E-6
q2= -1.9 E-6
d=...
Homework Statement
An 85 kg tobbogan that was originally accelerating at 3.0 m/s2 on frictionless snow hits a bare patch of concrete that exerts a force of friction on the sled of 180 N, what will the new acceleration be?
Homework Equations
F=ma
The Attempt at a Solution
Ok so this was...
Two stars of equal mass M move with constant speed V in a circular orbital of radius R about their common center of mass .What is the net force on each star?
the answer to this question was net force=GM^2/4R^2 .I want to ask that why net force not equal to zero although it is in translational...
Homework Statement
An accident victim with a broken leg is being placed in traction. The patient wears a special boot with a pulley attached to the sole. The foot and boot together have a mass of m = 4.0 kg, and the doctor has decided to hang a 6.0 kg mass from the rope. The boot is held...
Homework Statement
Calculate the net force on A.[/B]
Homework Equations
F=k . (q1 q2)/r^2 , k=9 x 10^9 Nm^2/C^2[/B]
The Attempt at a Solution
(9*10^9 Nm^2/C^2)(1,4 x 10^-6C)(7,2 x 10^-6C) / 1,7mm^2
= 0,0313.
Could someone tell me what I am missing even if what i did is even correct...
Homework Statement
Is the direction of net force always in the direction of motion?
The Attempt at a Solution
I would say no because the net force could be equal/balanced
for example if two kids were pulling on a stick
2 N left <---- . ----->2 N right
the Total Net Force would be 4 N...
Homework Statement
In the men's four-man bobsled event in the winter olympics, the maximum mas of a bobsled with pilot, two riders, and a brakeman is 630 kg. During a practice run, the rear rider and the brakeman exert average forces of 1220N and 1200N [forward] respectively to accelerate a...
Homework Statement
An object slides across a table at a constant 8.0 m/s to the right. The net force is...
A) zero
B) equal to the weight
C) equal to the mass times the velocity
D equal to the friction force
Homework Equations
N/A
3. The Attempt at a Solution
Bu narrowing it down i don't...
Homework Statement
Answer true, false, or Cannot tell to teach of the five statements below.
A) A 2 kg ball and a 3 kg ball are dropped from a tower. The net forces on each other are the same.
B) An astronaut stands on a bathroom scale on the surface of the moon; the scale reads the astronaut's...
Q: Why does the pin have a vertical force in this diagram (Static equilibrium)?
The diagram depicts as follows:
A mass (M) sits a a distance (d) away from the end of a board of length L. The board has a mass of m and is held to a wall by a pin and string. The string has a tension (T) and is at...
Homework Statement
In the picture
Homework Equations
In the picture attached.
The Attempt at a Solution
For the firecracker problem, I believe the only net external force is gravity. Therefore using, Fnet * delta t = delta p. Change in momentum is 12 kg * m/s. Thus, the final momentum of the...
[Mentor's note: no template because this thread was moved into the homework forum after it had already attracted several useful replies]
[Mentor's note: Thread title changed to reflect question content]
The question is:
An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to...
Homework Statement
Two masses: m1 = 45 kg, m2 = 12kg.
m1 (45kg) sits at rest on a table top with static friction co. 0.45, kinetic friction co. 0.35.
m2 is suspended in the air. m2 is attached to m1 by a massless wire hung over a frictionless pulley
Homework Equations
FBDs, net force...
I have a truck (m1,27000 kg) pulling a trailer (m2, 8500 kg) with a chain holding the two together (T). The overall acceleration is 0.78 m/s^2.
Find f1 force on the truck, f2 force on the trailer and T, tension force.
Here is what I did: since the force comes all from the truck, f1 =...
Hi everybody. This is my first thread ever on this forum :S
I'm in a first year physics class, and the other day we did a lab involving a c.c.c (current carrying conductor) and a magnet on a balance. The c.c.c was a wire which completed a circuit. One had a magnet assembly which was placed on...