Using the doppler waves simulation set the unshifted wavelength of the light to 415 nm. set the v/c slider to -0.017 and start the simulation, pausing after waves reach the far side of the screen. with the simulation paused use the distance indicator in the simulation to measure the distance between two successive crests along the dotted line to the right of the moving object. this distance is the apparent wavelength of the light λa.

λa =

using the relationship determine your measured v/c v/c (measured with slider at -0.017) = (record your answer to at least 2 significant figures)

now reset the simulation and set the v/c slider to -0.076 and repeat the steps above

v/c (measured with slider at -0.076) = your answer to at least 2 significant figures)

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?