A toaster using a Nichrome heating element operates on 120 V. When it is switched on at 20∘C, the heating element carries an initial current of 1.39 A. A few seconds later, the current reaches the steady value of 1.25 A. The average value of the temperature coefficient of resistivity for Nichrome over the temperature range from 20∘C to the final temperature of the element is 4.5×10−4(∘C)−1.

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%)

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane