Asphere has surface area 1.25 m2, emissivity 1.0, and temperature 100.0°c. what is the rate at which it radiates heat into empty space? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ∙ k4). a.) 9.9 mw b.) 3.7 w c.) 7.1 w d.) 1.4 kw

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet.whats one advantage of using electromagnetic in devices