NEED AN ANSWER FROM SOME ONE THAT IS FROM K12 1.The current model of the atom is known as the quantum mechanical model. This is also referred to as ?

Planetary Model

Democritus' Model

Bohr Model

Electron Cloud Model

2. The atomic mass is the sum of which two subatomic particles

protons and neutrons

only electrons

protons and electrons

neutrons and electrons

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

In the circuit shown below, with each bulb holding a resistance of 60 ohms, how many amps of current are flowing? express your number as a decimal.