Thursday
December 8, 2016

# Posts by Alphonse

Total # Posts: 45

Physics
It's actually 2.63cm.
January 18, 2013

Physics
If the puck had twice the height, how would the submerged depth change? If the puck had twice the radius, how would the submerged depth change?
January 18, 2013

Physics
A cylindrical wood puck (density = 0.75 g/cm3 ) is placed into a water bath. The density of water is 1.0 g/cm3. The wood puck has a diameter of 11.0 cm and a height of 3.5 cm. When the puck reaches equilibrium in the water bath, how far below the surface of the water will the ...
January 18, 2013

Physics
A balloon with a mass of 90 kg is filled with helium (density = 0.179 kg/m3). The balloon is spherical and has a diameter of 11.0 m. What is the maximum mass that can be attached to the bottom of this this helium balloon, for it to be able to fly? The density of air is 1.29 kg...
January 17, 2013

Physics
Suppose you pour water into a container until it reaches a depth of 12 cm. Next, you pour in a 25-cm-thick layer of oil so that it floats on top of the water. The density of the oil is 0.92 g/cm3 and that of water is 1.00 g/cm3. What is the pressure at the bottom of the ...
January 16, 2013

Physics
A metal surface is struck with light of wavelength 430 nm releasing a stream of electrons.  If the 430 nm light is replaced by 380 nm light of the same intensity, what is the result? a. no change to the emitted electrons b. emitted electrons are more energetic c. more ...
December 3, 2012

Physics
The kinetic energy of a massive particle is equal to the energy of a photon.  The massive particle moves at 1.49 % the speed of light.     What is the ratio of the photon wavelength to the de Broglie wavelength of the particle?  (Assume the standard ...
December 3, 2012

Physics
Observing electron interference through an ordinary macroscopic two-slit experiment would be extremely difficult and would require very slowly moving electrons.  (Slow for an electron means < 10^3 m/s.)   How slowly would electrons have to move through slits ...
December 3, 2012

Physics
An X-ray scattering from an electron with negligible initial kinetic energy is observed to undergo a change in wavelength by 2.561 pm.  i.e.  The scattered X-ray photon has a wavelength 2.561 pm larger than the incident X-ray photon.   Find the direction of ...
December 3, 2012

Physics
An X-ray scattering from an electron with negligible initial kinetic energy is observed to undergo a change in wavelength by 2.561 pm.  i.e.  The scattered X-ray photon has a wavelength 2.561 pm larger than the incident X-ray photon.   Find the direction of ...
December 3, 2012

Physics
An X-ray photon scatters from a free electron with negligible initial kinetic energy at an angle of 121.2 degrees relative to the incident direction.   (Take the Compton wavelength of the electron to be 2.43 pm, and all other constants/conversions to three accepted sig ...
December 3, 2012

Physics
Monochromatic light of an unknown wavelength passes through a single slit of width 5.59 Î¼m and forms an interference pattern on a screen 1.26 m away.  The width of the central bright fringe of the interference pattern is 18.8 cm.  The same light is then...
December 3, 2012

Physics
In an interference of light experiment, coherent light that contains two wavelengths: 640 nm (red-orange) and 425 nm (indigo-blue), passes through two narrow slits separated by 5.35 Î¼m, and the interference pattern is observed on an observation screen 2.51 m away...
November 29, 2012

Math
Find the most general antiderivative of the function. (Check your answer by differentiation. Use C for the constant of the antiderivative. Remember to use ln |u| where appropriate.) (x^5+x^3+8x)/x^4
November 23, 2012

Physics
Isn't the answer supposed to be in meters?
November 23, 2012

Physics
In an interference of light experiment, coherent light that contains two wavelengths: 640 nm (red-orange) and 425 nm (indigo-blue), passes through two narrow slits separated by 5.35 Î¼m, and the interference pattern is observed on an observation screen 2.51 m away...
November 23, 2012

Physics
Sorry for the late reply. Sadly, I didn't any of the ones you mentioned. Did you get #3?
November 23, 2012

Physics
A 19.5 gram, 56.3 centimeter long steel guitar string is vibrating in its fourth harmonic.  It induces a standing wave in a nearby 48.6 centimeter metal pipe open at one end.  The standing sound wave in the pipe corresponds to the pipe's fundamental frequency. &...
November 23, 2012

Physics
Yeah you're right, it does work. I must have done something wrong the first time. Thanks!
November 22, 2012

Physics
For some reason, it says it's the wrong answer.
November 22, 2012

Physics
A 14.3 gram bullet embeds itself in a 2.823 kg block on a horizontal frictionless surface which subsequently collides with a spring of stiffness 378 N/m.  The maximum compression of the spring is 13.5 centimetres.   a)  What was the initial speed of the bullet ...
November 22, 2012

Physics
Thanks for the help!
November 15, 2012

Physics
Calculate the ratio of the kinetic energy to the potential energy of a simple harmonic oscillator when its displacement is 1/8 of its amplitude. (The answer is an integer.) Approach: Choose a specific trigonometric form for the position function x(t). It doesn't matter ...
November 15, 2012

Physics
Did you get #1 and #3?
November 15, 2012

Physics
Thanks! Got it.
November 15, 2012

Physics
Sadly you have become trapped inside the gravity well of a star of mass M = 6.435×10^30kg. At a distance of r0 = 7.543×10^10m from the center of the star you find yourself moving directly towards it at 5.876×10^4m/s (relative to the star). How fast are you ...
November 15, 2012

Physics
Do you have 5,6,7,9,10,11?
November 14, 2012

Physics
yes, it's a=(m2g-m1g-kx)/(m1+m2+(.5)(mP))
November 14, 2012

Physics
A uniform 2.20 kg sign of height 0.600 m hangs freely from a frictionless pivot. (Its extension into the page is irrelevant: treat it as a thin uniform rod of ‘length’ 0.600 m, pivoted about one end.) You throw a point-like 0.248 kg snowball at the sign. It strikes ...
November 14, 2012

Physics
A uniform 5.32 kg solid sphere of radius 0.344 m that is free to roll on a horizontal surface has a light axle passing through its diameter as shown. The axle is connected to a like yoke and in turn a light rope as shown. A constant tension of 7.81 N is applied ot the rope and...
November 14, 2012

Physics
It's actually wf=wi(1/.54^2)=wi(3.43) I can't seem to get the second part though.
November 14, 2012

Physics
Two astronauts, each having a mass M are connected by a length of rope of length d have a negligible mass. They are isolated in space, orbiting their center of mass at an angular speed of ù0. By pulling on the rope, one of the astronauts shortens the total distance ...
November 14, 2012

Physics
A sphere with a moment of inertia 0.465mr2 and mass m and radius r rolls without slipping along an inclined track that is followed by a circular loop (like a roller coaster) of radius R. This happens on a planet where the acceleration due to gravity is g.  It starts from ...
October 26, 2012

Physics
Thank you very much!
October 26, 2012

Physics
A Ferris wheel (a vertical circle for the purposes of this question) with a radius 42.2 m is initially rotating at a constant rate, completing one revolution every 33.2 seconds. Suppose the Ferris wheel begins to decelerate at the rate of 0.0542 rad/s2. [Note: If it helps you...
October 26, 2012

Physics
It gives me the wrong answer for some reason. Thanks for the help though! I appreciate it.
October 26, 2012

Physics
You are riding a merry-go-round on the rim which is turning counterclockwise at a constant angular speed of 0.5 rad/s.  Your dog sees you at the 12 o'clock position when he is at the 3 o'clock position.  He starts running counterclockwise from rest with an ...
October 26, 2012

Physics
In the configuration shown (10m incline for m1 and 8m vertical length for m2 with a spring under it, both masses are linked by a rope and a pulley at the top), the 52.0 N/m spring is unstretched, and the system is released from rest. The mass of the block on the incline is m1...
October 25, 2012

Physics
In the configuration shown (10m incline for m1 and 8m vertical length for m2 with a spring under it, both masses are linked by a rope and a pulley at the top), the 52.0 N/m spring is unstretched, and the system is released from rest. The mass of the block on the incline is m1...
October 25, 2012

Physics
A simple pendulum consists of a light rod of length L = 0.9 m anchored at a fixed point (like the ceiling), and a small mass m = 0.5 kg attached to the free end.  The configuration is moved to an angle Î¸ = 39 degrees from the vertical and released from rest.&...
October 22, 2012

Physics
A 0.40kg block is held against a compressed spring of stiffness 68.2N/m and compression 0.64m parallel to a 24 degree incline that is 1.27m long. The coefficient of kinetic friction between the block and the incline is 0.34. The external force holding the block against the ...
October 18, 2012

Physics
What is the work done by kinetic friction along the length of the incline? What is the work done by the spring while the block is in contact with it? What is the speed with which the block leaves the incline?
October 15, 2012

Physics
A 0.40kg block is held against a compressed spring of stiffness 68.2N/m and compression 0.64m parallel to a 24 degree incline that is 1.27m long.  The coefficient of kinetic friction between the block and the incline is 0.34.  The external force holding the block ...
October 15, 2012

chemistry
What is the concentration of each type of ion on a 0.010 molar solution of Lithium sulfate (aq)?
September 15, 2010

1. Pages:
2. 1