Which of the following accurately describes how a magnetic motor works a
A set of electric coils are placed in a magnetic field. When a current passes through the wire, it creates a reaction that causes the atoms to being to shift into place
b
A set of electric coils are placed in a magnetic field. When a current passes through them, they create a magnetic field which interacts with the first magnetic field, causing the set of coils to rotate
c
A set of magnets are placed in an electric field. As the current increases or decreases, the strength of the electric field changes, causing the magnet to be more or less moved by the field
d
A set of magnets are placed in an electric field. A current is run through the magnets, thus increasing their magnetic fields. Once the magnetic field is increased, the magnets can be manipulated by the electric field by being guided around

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

Two horizontal plates with infinite length and width are separated by a distance h in the z direction. the bottom plate is moving at a velocity u. the incompressible fluid trapped between the plates is moving in the positive x-direction with the bottom plate. align gravity with positive z. assume that the flow is fully-developed and laminar. if the systems operates at steady state and the pressure gradient in x-direction can be ignored, do the following: 1. sketch your system 2. identify the coordinate system to be used. 3. show your coordinates and origin point on the sketch. list all your assumptions. 5. apply the continuity equation to your system. nts of navier stokes equations of choice to your system 7. solve the resulting differential equation to obtain the velocity profile within the system make sure to list your boundary conditions. check units of velocity 8. describe the velocity profile you obtain using engineering terminology. sketch that on the same sketch you provided in (1). 9. obtain the equation that describes the volumetric flow rate in the system. check the units.

14. a body is projected with velocity vi from a.at the same time another body is projectedvertically upwards from point b withvelocity v2 lies vertically below the highestpoint. both the bodies collide thenv2÷v1is