Askier with a potential energy of 137,200 j waits on top of a ski jump that is 200 m high. what is the mass of the skier? 20 kg 70 kg 137 kg 686 kg

70 kg

Explanation:

Potential energy can be found by a product of mass, height and the acceleration of gravity. Here we're given a potential energy of:

A height of:

Acceleration of gravity on Earth:

According to the potential energy equation, we can express it as:

We may rearrange this equation for mass now:

Substituting the given variables:

Therefore, the mass of the skier is 70 kg. Make sure to remember the right units: energy is measured in joules, mass is measured in kilograms, acceleration of gravity is measured in meters per second-squared, height is measured in meters.

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

the atomic mass is the bottom number on the element.

-steel jelly