Homework Statement
Prove that 5^(2/3) is irrational
Homework Equations
The Attempt at a Solution
I tried writing a proof but that is not getting me any where.
This is what I did so far -
Show that 52/3 is irrational
Proof: Suppose that 52/3 is rational:
52/3 = a/b...
Homework Statement
Which process, the formation of the chloro complex, or the formation of the aquo complex, is endothermic?
Co(H2O)62+ (aq) + 4Cl- <---> CoCl4 + 6H2O (l)
Pink ----------------------------- Blue
The Attempt at a Solution
The reaction above is endothermic because it turned...
Homework Statement
A rocket at rest in space, where there is virtually no gravitational force, has a mass of 2.55 * 105 kg, of which 1.81*105 kg is fuel.The engine consumes fuel at the rate of 480 kg/s and the xhaust speed is 3.27 m/s. The engine is fired for 250 s.
Find the thrust of the...
I know this is wrong because there's no way the answer can be this simple ...
W=F.d
-4 = mgsin30 * d
d = -4/20sin30
d = -.4
.4 to the left
is that even righttt?
Homework Statement
http://img137.imageshack.us/img137/9280/43448180.jpg [Broken]
find distance for gravity to do only -4 J of work
Homework Equations
[PLAIN]http://buphy.bu.edu/~duffy/PY105/12m.GIF
Wg = mgX
The Attempt at a Solution
Can anyone help me from the first stepp
A .50 kg block sliding on horizontal frictionless surface is attached to one end of a horizontal spring (with k = 500 N/M) whose other end is fixed. The block has a kinetic energy of 20J as it pass through its equilibrium position (the point at which the spring force is zero.)
what is the speed...
I did a calorimetry lab and here's my result
[PLAIN]http://img230.imageshack.us/img230/2953/fullscreencapture111420.jpg [Broken]
I'm supposed to find the heat absorbed by the water in the calorimeter, assuming the density of the solution to be 1.0 g/mL
I kniow I have to use the equation...
Homework Statement
Find the muzzle speed of a gun whose maximum range is 24.5 km.
Homework Equations
R = V02sin2angle/g
The Attempt at a Solution
How do I find the angle?
Also can you check what I did wrong in this one?
A projectile is fired at a speed of 840 /sec at an angle...
So suppose we have to go to a specific direction, say 300 miles west, but there is a wind blowing at 45 mi/hr .. how do I know what direction I should travel.
And also whats the difference between ground speed and airspeed??
Sorry, I dont have a attempt because I dont know how to find the...
Kinematics Collison question
Homework Statement
The engineer of a passenger train traveling at 84 m/s sights a freight train whose caboose is 480 meter ahead on the same track. The freight train is traveling in the same direction as the passenger train with a constant velocity of 60 m/s. The...
A particle starts from the origin at t = 0 and moves along the positive x axis. A graph of the velocity of the particle as a function of the time is shown in Fig. 2-43;
the v-axis scale is set by vs = 7.00 m/s. (a) What is the coordinate of the particle at t = 5.0 s? (b) What is the...
a is proportional to square root of (b *t2)
a is proportional to 1/c3
a is 5, when b = 9, t = 2, c = 3
Find a' when b'=25, t'=2, c'=5
My attempt:
= (25 root 5/12 root 3) 5
I think my steps are wrong, can someone help me!?