Homework Statement
Question is attached
Homework Equations
σ(x) = 0
σ(y)= P/A
t(xy)= Tc/j
The Attempt at a Solution
I know how to do the stress transformation, but my only issue is noticing why σ(x)= 0, I cant see it, can someone help me.
Homework Statement
As an electron moves from a high potential to a low potential, its electric potential energy?
a) increases
b) remains the same
c) decreases
Homework Equations
we know that
V=U q0
the electric potential = potential energy times the charge.
The...
Homework Statement
Determine the reaction at C.
Homework Equations
The Attempt at a Solution
i know i have to take the moment about line DB
and thus resulting in
ƩM(DB)= λ(DA X F) + λ(DC X RC) =0
where λ = DB/ DB
however the book solved it differently. they instead do...
Homework Statement
An opening in a floor is covered by a 1×1.2-m sheet of plywood of mass 18 kg. The sheet is hinged at A and B and is maintained in a position slightly above the floor by a small block C. Determine the vertical component of the reaction (a) at A, (b) at B, (c) at C.
Homework...
I did write the whole code and declared all my variables. i just didnt want to post it fully here for some reason or the other. I apologize. here is the whole code.
#include<iostream>
using namespace std;
int main()
{
int count;
int num;
int x;
count=1...
C++-- while-loop
Homework Statement
calculate the 3 largest number of a sequence
Homework Equations
you ask the user to input a sequence of numbers, and enter the value 0 to stop entering numbers.
c++
The Attempt at a Solution
i managed to calculate the the maximum of the series of...
Homework Statement
Figure 22-7a shows three particles with charges q1= +2Q,
q2=-2Q, and q3 = -4Q, each a distance d from the origin.
What net electric field E is produced at the origin?
Homework Equations
E=q/r^2* 1/(4∏ε0)
The Attempt at a Solution
So i calculated the of each particles...
Homework Statement
integrate 2t^(2)/(1+t^2)^(2)
Homework Equations
trig sub 1+tan^2(x)= sec^2(x)
The Attempt at a Solution
the attempted solution is attached.
And since there are no external forces acting on it, then momentum is conserved. so, we have to finish with what we started.
if there was a external forces, such as in a rocket thrust problem, then we will have to involve impulse, in order to calculate the the Vf of the rocket, right?
@Rude man, im confused. so in general, M(total) *V(initial)= M(train)*V(final train) + m(of sand)* velocity( throughout the 30 mins)
which gives me vf=20m/s. which is sort of weird, since is the same velocity we started with.
Is it okay to think of it this way; that in order to have...
It is an example question from old quizzes. why? the problem doesnt make sense? can someone help me?
so would it be (100,000)(20)= (85,000)(vf) +(15,000)(20)?
because the sand that is falling out, has the same speed of the cart throughout the 30 mins
Homework Statement
Im not sure if I did this problem correctly, can someone please reassure me?!
Homework Equations
Conservation of Linear momentum
pf=pi
m1v1=m2v2
The Attempt at a Solution
M(initial)=100,000 kg
M(final)= 100,000kg-15,000kg= 85,000kg
V(initial)=20.0m/s
V(final)=...
Homework Statement
I am just confused about Angular momentum.
Homework Equations
KE(rotational)= 1/2Iw^2
Angular momentum= Iw
The Attempt at a Solution
Why can I do the change in KE rotational to calculate the her final angular velocity in 3 revs?
very confused!! :( both equations relate...
Thank you so much for reassuring me. I got the correct answer. the lever arm for force mg is (2rh-h^2))^1/2 and the lever arm for force F is (r-h)
Thus, the sum of all torques Ʃτ= τF-τmg= 0 => τF=τmg
= F(h-r)=mg(2hr-h^2)^1/2
F= [mg(2hr-h^2)^1/2]/(r-h)
Thanks!!!!!!!!!!!!!!!!
Why are we making the pivot point at the top of the circle, wouldnt it make more sense to put it at the corner since we dont know the friction giving by the corner? because if we put the pivot point at the corner we would just need to calculate the torques with respect to the corner.
We have...
Homework Statement
what magnitude of force applied horizontally at the axle of the wheel is necessary to wheel over an obstacle of height h = 0.108 m? The wheel's radius is r = 0.698 m and its mass is m = 1.71 kg.
Homework Equations
I know that in order to have a static equilibrium we...
No. at first i thought we just had to take the position of each side and multiply it by the mass. but according to the book, we first had to find center of mass of the sides. Whats the appropriate way of solving these kinds of problems? because i would really like to have a good overall idea on...
Homework Statement
Three uniform thin rods, each of length L = 22 cm, form an inverted U. The vertical cords each have a mass of 14 grams. The horizontal rod has a mass of 42 grams. What are the x coordinate and y coordinate of the system's center of mass?
Homework Equations
xcom=...
Homework Statement
To form a pendulum, a 0.092 kg ball is attached to one
end of a rod of length 0.62 m and negligible mass, and the other
end of the rod is mounted on a pivot. The rod is rotated until it is
straight up, and then it is released from rest so that it swings down
around the...
so if i initially calculated that v1= 9.8 and v2= 0.2 their opposite signs would be -9.8 and -0.2 and when applied to the equation lv2-v1l = l -0.2+ 9.8l is still 9.6 m/s :-/
and for some reason the professor uses, v(f) = vi-gt
why is he subtracting gravitational force * time...
Homework Statement
Ball 1 is dropped from rest at a height of 10m above the ground. at the same time, ball 2 is thrown straight upward from ground level with an initial speed of 10m/s.
Homework Equations
find the relative velocity of the balls when they pass each other at t=1...
Homework Statement
Find a vector function that represents the curve of intersection of the two surfaces:
The cone z = sqrt( x^2 + y^2) and the plane z = 1+y.
Homework Equations
z = sqrt( x^2 + y^2) and the plane z = 1+y.
The Attempt at a Solution
This problem can be solved as...