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...
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.
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...
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...
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...
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...
Homework Statement
Find the volume of the solid that lies above the cone
ϕ=pi/3
and below the sphere
ρ=4cosϕ
.
Homework Equations
Find the centroid of the solid in part (a).
.
The Attempt at a Solution
For the volume I got 10pi which I am fairly sure is correct. I attempted trying to...
Homework Statement
Find the center of mass of a lamina in the shape of an isosceles right triangle with equal sides of length a if the density at any point is proportional to the square of the distance from the vertex opposite the hypotenuse.
Homework Equations
∫∫ (f(x,y) dA
mx= 1/m(∫∫...
Homework Statement
The partial burning of coal in the presence of O2 and H2O produces a mixture of CO(g) and H2(g) called synthesis gas. This gas can be used to synthesize organic compounds, or it can be burned as a fuel. A typical synthesis gas consists of 55.0% CO(g), 33.0% H2(g) and 12.0%...
Homework Statement
What is the heat capacity of water in J*g*°C
Homework Equations
A 74.8 sample of copper at 143.2g
is added to an insulated vessel containing 165ml of water, Density of water = 1.00 at 25.0 °C.
The final temperature is 29.7° C
The specific heat of copper is 0.385...