Lección 14 Los motores
y la energía calorífica
uby
"Entov, os comenzaron a cava cada vez a mida profundid
on boda de mayor cances de carbon Egunda fase
rundebams profundas de plante de den
modo conico para bombardia y cara de las minas Lamina
de vapor se desarrollo somente para decoresta necesidad concreta
desnood ciencia moderna del corso rechama
dodo de moins des para realizar
Completa el texto con la palabra correspondiente
La maquina de vapor
anorga mos en nergia mecanica La
mica inicial provine del
que producera
Empleado. La madera, of carbon el petróleo o la gergia
del rano entre
contienen energia quimica que puede transformarleen
clor la energie
have
cuya regla se transforme en energia
Esta energia mecanica puede amploare directamente para
como en una
por vase para
ular
cargo se transforman energia

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to. in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?