A mechanic working on a 100-m radar tower drops a hammer weighing 44.5 N. The work done on the hammer as it falls is

a. 4.45 N-m. b. 44.5 N-m.
c. 445 N-m. d. 4,450 N-m.


d

Physics & Space Science

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A marble moving 1.48 m/s rolls off the top edge of a 125-cm high table in a room where there is no appreciable air resistance and the acceleration due to gravity is 9.80 m/s2

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A point source of light is positioned 20.0 m below the surface of a lake. What is the diameter of the largest circle on the surface of the water through which light can emerge into the air? The index of refraction of water is 1.33

What will be an ideal response?

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Astronomers have discovered two black holes in the process of merging

Indicate whether the statement is true or false

Physics & Space Science