Ajoule is an amount of energy, and a watt is a rate of using energy, defined as 1 w = 1 j / s. how many joules of energy are required to run a 100 w light bulb for one day?

coal has about 30e6 j of energy per kg, but a power plant can only use 30% of this energy to make electricity (i. e., it is 30% efficient). how many kilograms of coal have to be burned to light a 100 w light bulb for one day?

Which statements about tornadoes are true? check all that apply. (a) about 12,000 tornadoes hit the united states every year. (b) a tornado looks like a funnel. (c) tornadoes are deadly atmospheric storms that cause millions in damages each year. (d) tornadoes can reach wind speeds of more than 300 miles per hour. (e) kansas is the state with the most tornadoes. (f) you will always notice a funnel before a tornado strikes.

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

Debris produced by mining is called