ok so i got the reduced mass
now i know that the formula for reduced mass is m1 + m2 / m1m2 but i don't really know where to go from here
what I am having trouble understanding is where the parallax and ratio of distances comes in
Homework Statement
we are looking at two stars in the eridani system, eri B and eri C. the period of the system is 247.9 years. the system's measured trigonometric parallax is 0.201 arcseconds and the tru angular extent to the semimajor axis of the reduced mass is 6.89". the ratio of...
Homework Statement
Consider an unresolved binary star at a distance of 500pc consisting of
an A1V dwarf and a K0III giant star.
compute mb and mv and B-V for this object
we know the mass, luminosty, radius, Mbol , Mv, Te , and B-V for each individual star.
Homework Equations...
Homework Statement
a 5.0 mm-diameter proton beam carries a total current of 1.5mA. the current density in the proton beam, which increases with distance from the center, is given by j=j(edge)(r/R), where R is the radius of the beam and j(edge) is the current density at the edge.
a) how many...
Homework Statement
the wire in the image below has a linear charge density \lambda . what is the electric potential at the center of the semicircle?
http://img18.imageshack.us/img18/5139/physicsproblem.jpg [Broken]
Homework Equations
The Attempt at a Solution
i know that the potential from...
Homework Statement
a long, thin rod of mass M and length L is standing stright up on a table. its lower end rotates on a frictionless pivot. a very slight push causes the rod to fall over. as it hits the table, what are (a) the angular velocity and (b) the speed of the tip of the rod...
Homework Statement
a hollow sphere is rolling long a horizontal floor at 5 m/s when it comes to a 30 degree incline. how far up the incline does it roll before reversing direction?
Homework Equations
The Attempt at a Solution
it seems like conservation of energy would work best for this...
im having problems dealing with the angle of the pendulum as it spins
if we have the y-axis in the direction of centrifugal force the sum of the forces would be:
ma = 400N - mgCos(angle)
could i consider the ball when its at a 90 degree angle to get rid of that thing
and at what point in...
Homework Statement
a 20 kg wood ball hangs from a 2.0 m long wire. the maximum tension the wire can withstand without breaking is 400 n. a 1.0 kg projectile traveling horizontally hit and embeds itself in a the wood ball. what is the largest speed this projectile can have without causing the...
Homework Statement
a small ball slides , with constant speed (a\theta tangential acceleration = 0) , around a horizontal circle at height h inside a firctionless, hemispherical bowl of radius R.
derive a formula for the balls angular velocity \omega in terms of the radius of the radius of the...
Homework Statement
a 10.2 kg weather rocket generates a thrust of 200N. the rocket ,pointing upwards, is clamped to the top of a vertical spring, whose spring constant is 500N/m and is anchored to the ground
a)initially before the engine is ignited the sits at rest on top of the srping. how...
Homework Statement
a 100g block on a frictionless table is firmly attached to one end of a spring with k = 20 N/m. the other end of the spring is anchored to the wall. a 20g ball is thrown horizontally toward the block with a speed of 5.0 m/s.
assuming that the collision is perfectly inelastic...
Homework Statement
say we have a block resting on a incline of a wedge (the incline is 40 degrees). the wedge is on a scale(mass of block is .2 kg and mass of wedge is .8kg).if the block is at rest (due to to static friction) the scale would read 9.8N. but let's say we eliminate the friction...
Homework Statement
we are trying to find the x -component of a velocity vector (V*cos\theta)
our uncertainty for the velocity is +-.0003 and for the and it is .5(in degrees)
how do we propagate the error for this
v=.048 while \theta =27 degrees
Homework Equations
The Attempt...
Homework Statement
a block pushed along the floor with velocity V0 slides a distance d after the pushing force is removed.
a) if the mass of the block is doubled but the initial velocity is not changed what is the distance the block slides before stopping?
b) if the initial velocity of the...
Homework Statement
find the indefinate integral of 1+x2/(1+x4)
Homework Equations
The Attempt at a Solution
im having trouble trying to figure what to use to substitute into this equation
Homework Statement
one day you take your bathroom scale with you into an elevator. the scale reads 150 lbs as the door closes. the reading varies between 120 lbs and 170 lbs as the elevator travels up. what is the acceleration of the elevator while its accelerating and decelerating...
Homework Statement
a rifle with a barell length of 60 cm fires a 10g bullet with a horizontal speed of 400 m/s. the bullet strikes a block of wood and penetrates to a depth of 12 cm. how long does it take the bullet to come to rest( from when it penetrates the block to when it stops)...
question about "vertical" and "horizaontal"
Homework Statement
the terms "vertical" and "horizontal" are frequently used in physics. give operational definitions for these two terms. an operational definition defines a term by how it is measured or determined. your definition should apply...
what is the relation between the centripetal acceleration, angular acceleration and tangential acceleration in circular motion?
for example if the centripetal acceleration vector is getting larger for an object in circular motion does this mean something is also happening to the tangential...
Homework Statement
if you step on your car's breaks hard, the wheels stop turning after 1.0 revolution. At the same constant acceleration , how many revolutions do the wheels make before stopping if you initial speed is twice as high?
Homework Equations
The Attempt at a Solution
im having...
Homework Statement
we are mixing CuSo4 (Cu2+) with an iron (Fe) powder and we are trying to determine whether Fe2+ forms or Fe3+
now the question is :
suppose that 1.0 g of iron is used in the experiment. what is the minimum volume of Cu2+ solution that must be added in order to completely...
Homework Statement
element X reacts with oxygen to produce a pure sample of X2O3 . in an experiment, it is found that 1.0g of X produces 1.1596g of X2O3 . what is the molar mass of X?
Homework Equations
The Attempt at a Solution
well we can write a equation for it 4X + 3O2 --->...
Homework Statement
a ball is shot straight up from the ground with speed Vo. simultaneously, a second rubber ball at height h directly above the first ball is dropped from rest
at what height above the ground do the balls collide?asnwer should be a symbolic expression in terms of Vo and g...
Homework Statement
a rocket is launched straight up with a constant acceleration. four seconds after takeoff , a bolt falls off the side of the rocket. the bolt hits the ground 6.0 seconds later. what was the rockets acceleration?
Homework Equations
any kinematics equations
The Attempt at a...
Homework Statement
lets say we have A * B
A=12.8 + 0.2
B=3.75 + 0.08
how would we calculate the new uncertainty value
ive seen soo many ways of doing this I am a bit confused
thanks in advance
Homework Equations
any equation used to calculate uncertainty
The Attempt at a Solution...
gas laws problem (need quick help please)
Homework Statement
ill try to describe the situation as best i can
at first we have a flask (150 ml) with 0.1g of NaHCO3 we attach a syringe with 20ml of acetic acid (CH3COOH ) to it (and seal it off so nothing escapes)
we inject the acetic acid...
one more quick thing about dimensional analysis :)
in an equation let's say X=Vit + 1/2 a t2
if we wanted to prove that this equation is dimensionally correct, how would the + between the 2 terms on the r.h.s effect the analysis would we have to ignore the + and just try to make it so that...
Homework Statement
determin the dimensions of \alpha in the following
a)Sin(\alphaX^{}2) (alpha* X squared) (X is a distance)
b)10\alphat3
c)cot(\alphaX2/R) (R is a radius)
d)e(hf/\alphaT - 1 (h is Plancks constant with units J*s) ( f is frequency
Homework Equations
The Attempt at a...