In the early 1900s, Robert Goddard proposed sending a rocket to the moon. critics took the position that in a vacuum such as exists between earth and the moon, the gases emitted by the rocket would having nothing to push against to propel the rocket. to settle the debate, Goddard placed a gun in a vacuum and fired a blank cartridge from it. (a blank cartridge fired only the hot gases of the burning gunpowder.) what happened when the gun was fired?

Afixed electric space heater wired by a cable with an ampacity of 30 a should draw a maximum current of a. 30 a. b. 24 a. c. 15 a. d. 27 a.

In what direction does the medium move relative to the direction of the wave? explain.

Asteam power plant operates on an ideal reheat rankine cycle between the pressure limits of 15 mpa and 10 kpa. the mass flow rate of steam through the cycle is 12 kg/s. steam enters both stages of the turbine at 500°c. if the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. also, show the cycle on a t-s diagram with respect to the saturation lines. (2.15 mpa; 45.0 mw; 42.6%)