Homework Statement
Ok so I'm doing this practise problem but I have no clue what to do.
"A radioactive sample intended for irradiation of a hospital patient is prepared
at a nearby lab. The sample has a half-life of 83.61 h. What should it's initial activity be if it's activity is to be...
Homework Statement
A block of mass m = 3.4 kg is dropped from height h = 44 cm onto a spring of spring constant k = 1920 N/m (Fig. 8-38). Find the maximum distance the spring is compressed.
[PLAIN]http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c08/fig08_36.gif [Broken]...
Homework Statement
http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c07/pict_7_36.gif
gives spring force Fx versus position x for the spring–block arrangement
http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c07/pict_7_11.gif
The scale is set by Fs = 160 N. We...
Homework Statement
A person pushes with force of 220N on a 40 kg create. The coefficent of kinetic friction of 0.35. What is the magnitude of the frictional force?
Homework Equations
Ff = uN
The Attempt at a Solution
so do I just go
Ff = 0.35*(40kg)(9.81m/s^2)...
Homework Statement
The velocity of a 6 kg particle is given by v = (5ti + 4t2j ) m/s, with time t in seconds. At the instant the net force on the particle has a magnitude of 43 N, what are the direction (relative to the positive direction of the x axis) of (a) the net force and (b) the...
Homework Statement
A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration a = (6i + 7j)m/s^2 . At time t = 0, the velocity is (3i)m/s . What are the (a) magnitude and (b) angle of its velocity when it has been displaced by 12.0 m parallel to the x axis...
I have 2 question.
1) In projectile motion is the velocity in the x compontent constant, while above the release point?
2) Is Y = Voy * t - 0.5 * 9.81 * t^2 the equation used to find the heigth at any given time?
Thank You.
Hi I'm trying to make a distribution curve in excel, but I can't seem to find it. I have excel 2003 I know how to make column graphs and stuff, but I can't seem to find where to find how to make a distribution curve can anyone help me?
Here is a link of the type of graph I want to make...
Homework Statement
When a high-speed passenger train traveling at 158 km/h rounds a bend, the engineer is shocked to see that a locomotive has improperly entered onto the track from a siding and is a distance D = 699 m ahead. The locomotive is moving at 27.2 km/h. The engineer of the...
Homework Statement
Let v = (-1,2,5) Find all scalars k such that llkvll = 4
The Attempt at a Solution
I don't know what to do please help
Homework Statement
Homework Equations
The Attempt at a Solution
Homework Statement
Let A * x= 0 be a homogeneous system of n linear equations in n unknowns, that has only the trivial solution. Show that if k is any postive integer, than the system A^k * X = 0 also has only the trivial solution.
The Attempt at a Solution
I'm so lost please help...
It seems that our perception of time is inter-related to the loss of energy and order over time. If infinite regress were true when that means infinite energy right?
So can we have infinite energy? Is there infinite regress? Can we even have infinite energy?
Homework Statement
The question I have is, is can we have infinite energy?
The Attempt at a Solution
I've tried thinking about this.
It seems that our perception of time is inter-related to the loss of energy and order over time. If infinite regress were true when that means...
Ok this is what I did
int n;
cout << enter number;
cin >> n;
for (int i = 1 ; i < n ; i++ )
if ( n % i == 0 )
I could use some help please like how to I extract the divisor?
so I can add them. Thanks a lot.
Here is what the excerise says
One such command displays fractions. For example 5/4 is entered
"\frac{5}{4}". Write a computer program that simulates a \frac{}{}
command. The program reads two integers n1 and n2
EXAMPLE 1:
Enter fraction in the form n1/n2: 5/4
...
I'm doing an excerise to make factions, but I need to simulate a \frac{}{}
command. To display numbers in faction AND decimal form. How do I simulate a
\frac{}{} command? Thanks. Like I have to prompt the user.
int denominator, numerator;
scanf("\\frac{%d}{%d}", &numerator...
Like for example
Prompting message reads.
"Please enter a positive value"
Example:
Please enter a positive value: 234.7
Rounded to the nearest integer the number is: 235
Please enter a positive value: 10.3
Rounded to the nearest integer the number is: 10
What I have...
Homework Statement
Determine the wavelenghts of photons given off for the 3rd line in the Lyman series, the 2nd line in the Balmer series and the 1st line in the Paschen series.
The Attempt at a Solution
Lyman series: n=1
Balmer series: n=2
Paschen Series: n=3
What do I do?
How many photons per second are emitted by a monochromatic light bulb (650nm) that emits 25 W of power?
W=hfo
hf=Ek + W
P=W/t
is there a way we can find power? how do I solve this question?
Homework Statement
A positively charged particle of mass 7.2 * 10^-8kg is traveling east with speed of 85 m/s. The particle enters a 0.31 T uniform magnetic field, and 2.2 * 10^-3 secounds later leaves the field one-quarter south with speed of 85 m/s. What is the charge of the particle and...
Homework Statement
The turbine produces current that is at 12kV. To lessen the problem of Ohmic heating, a transformer steps up the voltage to 138kV for power line tranmission.
Homework Equations
Np/Ns=Vp/Vs
?
Homework Statement
Prove that the time for one revolution of a charged particle moving perpendicular to a uniform magnetic field is independent of it's speed. Write an expression that gives the period T in terms of the mass and charge of the particle and the magnetic field strength...
Homework Statement
How would I find how long it takes for an alpha particle to move halfway through a complete circle?
Homework Equations
Fc=mv^2
Ft=mv
The Attempt at a Solution
if they gave me speed how would I find how much it traveled?
Homework Statement
At a point near the equator, the Earth's magnetic field is horizontal and points to the north. If an electron is moving vertically upward at this point, what is the direction of the magnetic force acting on this? Explain.
Homework Statement
How fast is the area of a square increasing when the side is 3 meters in length and growing at a rate of 0.8meter/minute?
Homework Equations
SA=LW
L=3
dL/dt=0.8
The Attempt at a Solution
I have no clue how to start this and I'm bad at word problems.
Homework Statement How do I prove the relationship between the equivalent resistance of a parallel circuit and the values of the constituent resistors exist?
Homework Equations
V=IR
The Attempt at a Solution
Is it because:
I total= I1+I2+I3
and V is the same in parallel...
When drawing Parallel and Series Circuits when differences are there? Like are there differences in voltmeter and amp meter what differents are there when drawing?
So I take the slope of this? 3x + 2y = 7
so...
2y = -3x + 7
y= -3/2x + 7/2
slope = -3/2 so if it is perpendicular the slope is 2/3 is that my right slope?
I now I have to do more but it that right so far?
Homework Statement
Find the point on the parabola y= 4x^2 + 2x - 5 where the tangent line is perpendicular to the line 3x + 2y = 7.
Homework Equations
The Attempt at a Solution
I don't know what to do since I was away the last 3 classes since I was away. Help me please.
Homework Statement
A 47 resistor can dissipate up to 0.25-W of power without burning up. What is the smallest number of such resistors that can be connected in series across a 9.0-V battery without anyone of them burning up>
Homework Equations
V=IR
P=IV
The Attempt at a Solution
I...
Homework Statement
A charge of 3.5*10^-6 is fixed on the x-axis at x= 0.55m, while a charge of -15*10^-6 is fixed at the origin. What is the net electric field on the x-axis at 0.8m?
Homework Equations
Fe = qE
The Attempt at a Solution
Used Fe = qE, but that's it.