Author Question: A crane lifts a 425 kg steel beam vertically a distance of How much work does the crane do on the ... (Read 142 times)

arivle123 · **on:** Jul 29, 2018

A crane lifts a 425 kg steel beam vertically a distance of How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces.

A) 5.8 105 J
B) 3.4 105 J
C) 4.0 105 J
D) 4.9 105 J

Question 2

A rectangular box is positioned with its vertices at the following points:

A = (0,0,0) C = (2,4,0) E = (0,0,3) G = (2,4,3)
B = (2,0,0) D = (0,4,0) F = (2,0,3) H = (0,4,3)
If the coordinates all have three significant figures, the angle between the line segments AG and AH is closest to:
A) 21.8.
B) 22.5.
C) 26.6.
D) 36.9.
E) 45.0.