The first law of thermodynamics states that △e = q-w. is this also a statement of the principle of conversation of energy? a. the heat that flows into the system is transformed into work and a change in internal energy b. the energy that flows into the system is transformed into heat and work c. the work that is done by the piston is transformed into heat and a change in internal energy d. a change in internal energy causes work to be done and heat to flow into the system

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.