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
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A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is
A) 10%. B) 20%. C) 50%. D) 80%. E) need more information
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
(a) How far from the base of the table will it strike the floor? (b) How long will it be in the air?
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?
Astronomers have discovered two black holes in the process of merging
Indicate whether the statement is true or false