Rhea is running towards Sean and kicks a soccer ball to him. Sean is standing still

Astep up transformer has 250 turns on its primary and 500 turns on it secondary. when the primary is connected to a 200 v and the secondary is connected to a floodlight that draws 5a, what is the power output? show all of your work.

When oxygen reacts with hydrogen, it has the capacity to release 29 kilojoules of energy. inside a fuel cell, oxygen reacts with hydrogen to produce 23 kilojoules of useful energy. the rest of the energy is lost as heat. what's the efficiency percentage of the fuel cell?

Daniel is 50.0 meters away from a building. he observes that his line-of-sight to the tip of the building makes an angle of 63.0° with the horizontal. what is the height of the building?