Atwo stage rocket is to be used to deliver a payload of 1000 kg to a circular low- earth orbit altitude 1200 km; 40% of the delta-v will be delivered by the first stage, and 60% by the second stage. the vehicle will be launched eastward from kennedy space center where the speed of rotation of the earth is 427 m/s. assume gravitational velocity losses of about 1200 m/s and aerodynamic velocity losses of 500 m/s. the first stage burns kerosene and oxygen producing a mean specific impulse of 320 seconds averaged over the flight, while the upper stage burns hydrogen and oxygen with an average specific impulse of 450 seconds. the inert fraction of the first stage is 0.05 and that of the second is 0.07. determine mpayload/ minitial_(the ratio of mass of payload to the initial mass), and the total mass of the vehicle on the launchpad. assume perfectly expanded nozzles.

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Which type of circuit is becoming more common in residential electrical design and construction? a. hazardous-area circuit b. three-phase circuit c. 480-volt circuit d. communication circuit

I'm kinda lost ! 1. when marilyn takes her pet dog for a walk, the dog walks at a veryconsistent pace of 0.55 m/s. draw a position-time graph to representmarilyn's dog walking the 19.8 m distance from the front of her house tothe nearest fire hydrant.2. both car a and car bleave school when a stopwatch reads zero. car atravels at a constant 75 km/h, and car b travels at a constant 85 km/h.a) draw a position-time graph showing the motion of both cars. howfar are the two cars from school when the stopwatch reads 2 hrs? calculate the distances and show them on your graph.b) both cars passed a gas station 120 km from the school. when dideach car pass the gas station? calculate the times and show themon your graph.3. the figure below shows the position-time graph showing a shopper'smovement up and down the aisle at a store.a) write a story describing the shopper's movements at the store.b) when does the shopper have a position of 6 m? c) how much time passes between when the shopper enters the aisleand when he gets to a position of 12 m? what is the shopper's averagevelocity between 37 s and 46 s?