The approximate heating value of coal is 3.25 x 104 kj/kg (14,000 btulb). a modern coal-fired power plant rated at 1000 mw(el) requires a thermal input of about 2600 mw from fuel. (a) assuming operation at rated power percent of the time in a calendar year, how many kilograms of coal would be required? (b) if 6.2 percent of the coal used is discharged as ash, what is the annual ash accumulation?

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.

snell's law

refractve index = sin incidence / sin refraction