Physics

Problem

The observatory in the Burj Khalifa (the tallest building in the world in 2021) is 556 m above the ground. The gravitational field strength in the region just above the Earth's surface is

9.81 \text{ Nkg}^{-1}

. a. a How much work must be done to take an observer, of mass 60 kg, from the ground floor up to the observatory of the Burj Khalifa? b. b Given that the mass of the Earth is

6 \times 10^{24} \text{ kg}

and its average radius is 6400 km, what fraction of the observer's

E_p

at the surface is your answer to part a? (

G = 6.67 \times 10^{-11} \text{ Nm}^2\text{kg}^{-2}

)

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