In order for planes to take off from an aircraft carrier deck, they need an initial speed boost. this initial speed is provided by the aircraft carrier in the form of a catapult system (using either steam or electromagnetic force). we want to take off an f-22 from an aircraft carrier. the f-22 has a mass of 21430 kg and the aircraft catapult pushes the airplane across its 98 m long flight deck with a constant force of 415000 n. assume the flight deck is level. a) what is the velocity of the f-22 as it leaves the flight deck? b) if the aircraft carrier flight deck is 21 m above the ocean surface, then how much time does the f-22 have to begin flying once it leaves the flight deck? c) how far away from the aircraft carrier does the f-22 travel in the time calculated in part b) (assume the aircraft carrier remains stationary and the plane does not start flying)?

Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)

When using the scientist method, which step comes last?

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is