Un móvil parte del reposo y, al cabo de 5 s, alcanza una velocidad de 5 m/s; a
continuación, se mantiene con esa velocidad durante 4 s, y en ese momento frena
uniformemente y se detiene en 3 s.
a) Representa la gráfica v-t correspondiente a dicho movimiento.
b) Calcula la aceleración que lleva el móvil en cada tramo.
c) Calcula el espacio total recorrido a lo largo de todo el movimiento.

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2