El poder calorífico de los alimentos (en realidad la entalpía de combustión del alimento por unidd de masa) puede ser determinada midiendo el calor producido al quemarse una cantidad del alimento. El calor total desprendido en la combustión total de un gramo (3,10x10-3  moles) de una muestra de grasa de pollo, a volmen constante, es de 10000 calorias a 37 grados celsius, cuya reacción viene dada por: C20H32O2(S)+27O2(g)> 20CO2(g)+16H2O.

Calcular el poder calorífico de la grasa de pollo a 37 grados celsius y presión constante.

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Aspecial electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop ride at an amusement park. the sensor measures the magnitude of the normal force that the seat exerts on a rider. the loop-the-loop ride is in the vertical plane and its radius is 23 m. sitting on the seat before the ride starts, a rider is level and stationary, and the electronic sensor reads 740 n. at the top of the loop, the rider is upside down and moving, and the sensor reads 370 n. what is the speed of the rider at the top of the loop?

Which notation is used to represent an alpha particle? a. b. c. d.

Arrange the images in order to show how lake-effect snow occurs.