. AYUDA URGENTE ES OARA UN EXAMEN AHORITA Un automóvil de 4kg parte con una velocidad de 35 km/h y se desplaza en el plano durante 1.5 hr. Posteriormente asciende por una pendiente de 43.2º a una velocidad de 25 km/h y trascurre un tiempo de 15 min. Se dese conocer:

a. La energía mecánica
b. El trabajo realizado
c. La potencia que se requiere
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Determine la velocidad, la fuerza y distancia que recorre un ciclista cuya masa es de 97 kg si su energía cinética es de 630 J y trascurre un tiempo de 0,5 h.

. Se lanza verticalmente hacia arriba una pelota de 0.4 kg con una velocidad de 30 m/s. Calcular:

a. El valor de la energía cinética y potencial
b. La energía cinética y potencial a 15m de altura
c. La energía mecánica del desplazamiento.

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i.e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.