19. Kirsten has a device that has an electromagnet at its core. It is surrounded by a permanent magnet. She can attach the device to a battery and it will spin. What type of
device does Kirsten MOST LIKELY have?
a. a solenoid
b. a simple motor
c. an electromagnet
d. a simple generator

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%)

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?