Monday
September 22, 2014

Posts by DCM


Total # Posts: 31

Physics (Please help!)
Three resistors of different values can be connected together in different configurations. If all three resistors are used in a circuit, how many different values of total resistance can be produced? I can only find five... but the answer key says eight.
April 8, 2012

Physics
If a ball is thrown directly upwards with twice the initial speed of another, how much higher will it be at its apex? A) 8 times D) 2 times B) 4 times E) 2 times C) 2 2 times Please show any equations that are used :)
April 7, 2012

Physics
What visible wavelengths will eject electrons from a a metal with a work function of 2.6 eV? Please show all work I am a little confused :)
April 6, 2012

Physics
Lead 212/82Pb (atomic mass = 211.991871 u) is converted into bismuth 212/83Bi (atomic mass = 211.991255 u) via β- decay. What is the energy (in MeV) released in this process?
April 6, 2012

Alg1, Factoring
(x-1)(x+3)..... if you add 3 to negative one, you get two which is your middle number. If you multiply three and negative one, you get negative three which is your last number.
April 6, 2012

Physics
A proton is located at a distance of 0.430 m from a point charge of +8.30 µC. The repulsive electric force moves the proton until it is at a distance of 1.55 m from the charge. Suppose that the electric potential energy lost by the system is carried off by a photon that ...
April 6, 2012

Physics
That is what the question says n is
April 6, 2012

Physics
So i did (5.29e-11)(81)= 4.2849e-9. But it still says that is incorrect...
April 6, 2012

Physics
A triply ionized beryllium atom (Be3+) has only one electron in orbit about the nucleus. What is the radius of the ion when it is in the n = 9 excited state?
April 6, 2012

Physics
In the hydrogen atom the radius of orbit B is sixteen times greater than the radius of orbit A. The total energy of the electron in orbit A is -0.378 eV. What is the total energy of the electron in orbit B?
April 5, 2012

Physics (PLEASE HELP)
Two slits are 0.144 mm apart. A mixture of red light (wavelength = 665 nm) and yellow-green light (wavelength = 565 nm) falls on the slits. A flat observation screen is located 2.11 m away. What is the distance on the screen between the third-order red fringe and the third-...
March 14, 2012

Physics
Two slits are 0.144 mm apart. A mixture of red light (wavelength = 665 nm) and yellow-green light (wavelength = 565 nm) falls on the slits. A flat observation screen is located 2.11 m away. What is the distance on the screen between the third-order red fringe and the third-...
March 13, 2012

Physics
The light shining on a diffraction grating has a wavelength of 470 nm (in vacuum). The grating produces a second-order bright fringe whose position is defined by an angle of 9.35°. How many lines per centimeter does the grating have?
March 13, 2012

Physics
The drawing shows a cross section of a plano-concave lens resting on a flat glass plate. (A plano-concave lens has one surface that is a plane and the other that is concave spherical.) The thickness t is 1.38 10-5 m. The lens is illuminated with monochromatic light (λ...
March 13, 2012

math
I do not believe so, because in order to get the perimeter, you multiply the diameter by pi, and that would not ever give you a perimeter that is four times the diameter, because pi is 3.14
March 13, 2012

physics
Red light (n = 1.520) and violet light (n = 1.538) traveling in air are incident on a slab of crown glass. Both colors enter the glass at the same angle of refraction. The red light has an angle of incidence of 26.50°. What is the angle of incidence of the violet light?
March 7, 2012

Physics
An object is placed in front of a converging lens in such a position that the lens (f = 14.0 cm) creates a real image located 27.0 cm from the lens. Then, with the object remaining in place, the lens is replaced with another converging lens (f = 18.0 cm). A new, real image is ...
March 6, 2012

Physics
A converging lens ( f = 12.2 cm) is held 7.65 cm in front of a newspaper, the print size of which has a height of 1.88 mm. Find the image distance (in cm) and the height (in mm) of the magnified print. d = cm h = mm
March 6, 2012

Physics
Red light (n = 1.520) and violet light (n = 1.538) traveling in air are incident on a slab of crown glass. Both colors enter the glass at the same angle of refraction. The red light has an angle of incidence of 26.50°. What is the angle of incidence of the violet light?
March 6, 2012

Physics
Two converging lenses are separated by 23.40 cm. The focal length of each lens is 12.20 cm. An object is placed 35.00 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right.
March 5, 2012

Physics
Sunlight strikes a fused quartz surface. At what angle of incidence is the reflected light completely polarized?
March 5, 2012

Physics
A spotlight on a boat is y = 2.6 m above the water, and the light strikes the water at a point that is x = 8.6 m horizontally displaced from the spotlight. The depth of the water is 4.0 m. Determine the distance d, which locates the point where the light strikes the bottom. m
March 5, 2012

Physics
A light ray in air is incident on a water surface at a 44° angle of incidence. Find each of the following angles. (b) the angle of refraction °
March 5, 2012

Physics (DUE SOON)
A generating station is producing 2.00 106 W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.00 10-2 /km. (a) Find the power lost in heating the wires if ...
February 13, 2012

Physics (PLEASE HELP)
A generating station is producing 2.00 106 W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.00 10-2 /km. (a) Find the power lost in heating the wires if ...
February 12, 2012

Physics (due soon!)
One component of a magnetic field has a magnitude of 0.080 T and points along the +x axis, while the other component has a magnitude of 0.034 T and points along the -y axis. A particle carrying a charge of +1.00 10-5 C is moving along the +z axis at a speed of 3.60 103 m/s. (a...
February 7, 2012

Physics (PLEASE HELP)
It still says this is not correct. I got 1.156e-4
February 7, 2012

Physics (PLEASE HELP)
A -6.00 µC charge is moving with a speed of 6.60 104 m/s parallel to a very long, straight wire. The wire is 5.00 cm from the charge and carries a current of 73.0 A in a direction opposite to that of the moving charge. Find the magnitude and direction of the force on the...
February 7, 2012

Physics
An -particle has a charge of +2e and a mass of 6.64 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.10 106 V and then enters a uniform magnetic field whose magnitude is 3.10 T. The -particle moves perpendicular to the magnetic field ...
February 6, 2012

Physics
One component of a magnetic field has a magnitude of 0.080 T and points along the +x axis, while the other component has a magnitude of 0.034 T and points along the -y axis. A particle carrying a charge of +1.00 10-5 C is moving along the +z axis at a speed of 3.60 103 m/s. (a...
February 6, 2012

Physics
A -6.00 µC charge is moving with a speed of 6.60 104 m/s parallel to a very long, straight wire. The wire is 5.00 cm from the charge and carries a current of 73.0 A in a direction opposite to that of the moving charge. Find the magnitude and direction of the force on the...
February 6, 2012

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