A 120 voltage source is connected in series to a 2.5 ohm resistor and in parallel to a 13 ohm and a 135 ohm resistor (Combination circuit). Draw the circuit diagram with all of the values labeled. Show the direction of the current in each branch on your diagram.

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather