During which stage of developing the global positioning system did engineers first apply the theory of relativity
to design the product?
The global positioning system (GPS) uses
electromagnetic waves sent between computer devices
on Earth and satellites in space to automatically
determine the exact position of the computer device on
Earth. In order to create this technology, engineers had
to apply Einstein's theory of relativity, which explains
how electromagnetic waves change direction in space.
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How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

Which type of microscope would allow the viewer to see ribosomes inside a cell?