. 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
.
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 steady-flow steam power plant system, two adiabatic high-pressure and low-pressure turbines ane used to generate power. superheated steam enters the high-pressure turbine at 8 mpa and 550°c. the steam expands in the high-pressure turbine to a saturated vapor at 3 mpa. in order to increase the powe generation of the power plant, another steam turbine working in a lower pressure ranges is deployed. the outlet vapor from the first turbine is heated up at a boiler to the temperature of 500 c at the constant pressure of first turbine's outlet (3 mpa). then, the vapor enters the second turbine and produces extra work. the exit conditions of the second turbine are 5o kpa and 90 percent quality. if the total power output of the power plant is 25 mw, determine a) the mass flow rate of the water (kg/s). b) heat transfer rate in the boiler (mw). (30 points) 3 mpa 00 c 8 mpa s0 c high pres turbine low pres boiler turbine 50 kpa 3 mpa 09 saturated vapor t heat engine, shown in the figure, operates between high temperature and low temperature of through a heat 4. a carnot tn and tu respectively. this heat engine receives energy from a heat reservoir at t exchanger where the heat transferred is proportional to the temperature difference as ? = k (z,-7, ). it rejects heat at a given low temperature tl. to design the heat engine for maximum work output, find the high temperature, th, as a function of tes and t. (15 points) qe

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon