Consider the possibility of using two rotating cylinders to replace the conventional wings on an airplane for lift. consider an airplane flying at 150 km/hr through the standard atmosphere at 2,000 m. each "wing cylinder" has a 1.0-m radius. the surface velocity of each cylinder is 20 km/hr. find the length ℓ of each wing to develop a total lift of 40 kn. assume potential flow and neglect end effects.

Gunpowder residue is most likely to show up where on a shooters hands

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.