A 2 kW kettle contains 2 kg of water at 10°C. It is switched on for 420 seconds, and the
temperature rises to 100°C.
a) How much electrical energy is supplied?
b) How much energy was given to the water?
c) Why are these 2 answers not the same?
d) What percentage of the energy supplied wen
to the water?
e) How could this percentage (the efficiency)
be increased?

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

In which type of system is power held solely by the central government and not shared with regional governments? group of answer choices federal unitary confederate oligarchic

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)