Adiesel engine performs 2100 j of mechanical work and discards 4500 j of heat each cycle. part a)
how much heat must be supplied to the engine in each cycle?
part b)
what is the thermal efficiency of the engine?

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?

(1 point) match the differential equations and their vector valued function solutions. you may wish to multiply at least one solution out fully, to make sure that you know how to do it. you can get the other answers quickly by process of elimination and just multiply out one row element.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up