A model of rocket is used to test materials that would be used to build the body of the extra rocket what is the limitation of this model? A. It is smaller than the actual rocket
B. It can be used to per deep out the materials why be affected by a rocket launch
C. It is less expensive than the actual rocket
D. It uses the materials that will be used on the extra rocket

Earthplanet yplanet y5=earth     *many different equationsplanet x1.5=earthplanet x is two times planet yobject 5,2500 mass5,1,3,2,4object 1 is four times obect 4

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.

Sound wavelength of visible light waves