How does the flux of light from an isotropic source depend on the distance r from the source?

Which boundary is associated with the building of the himalaya mountains? convergent transform divergent hot spot

How do we measure or think of speed in the united states?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.