DCM

Most popular questions and responses by DCM
  1. 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

    asked on April 6, 2012
  2. 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 :)

    asked on April 7, 2012
  3. 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.

    asked on March 5, 2012
  4. 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

    asked on March 7, 2012
  5. 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?

    asked on April 6, 2012
  6. 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

    asked on March 6, 2012
  7. 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?

    asked on March 13, 2012
  8. 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 °

    asked on March 5, 2012
  9. 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?

    asked on April 5, 2012
  10. Physics

    Sunlight strikes a fused quartz surface. At what angle of incidence is the reflected light completely polarized?

    asked on March 5, 2012
  11. 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

    asked on March 13, 2012
  12. 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

    asked on March 6, 2012
  13. 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).

    asked on March 6, 2012
  14. 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

    asked on February 12, 2012
  15. 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.

    asked on April 8, 2012
  16. 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

    asked on February 6, 2012
  17. 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

    asked on March 13, 2012
  18. 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

    asked on February 7, 2012
  19. 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

    asked on March 14, 2012
  20. 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

    asked on March 5, 2012
  21. 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

    asked on February 6, 2012
  22. 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?

    asked on April 6, 2012
  23. 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 :)

    asked on April 6, 2012
  24. 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

    asked on February 13, 2012
  25. 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

    asked on February 7, 2012
  26. 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

    asked on February 6, 2012
  1. 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.

    posted on April 6, 2012
  2. Physics

    That is what the question says n is

    posted on April 6, 2012
  3. Physics

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

    posted on April 6, 2012
  4. 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

    posted on March 13, 2012
  5. Physics (PLEASE HELP)

    It still says this is not correct. I got 1.156e-4

    posted on February 7, 2012