A crane lifts a 425 kg steel beam vertically a distance of How ...

[arivle123]

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.

[izzat]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: A

[arivle123]

Excellent

[epscape]

Gracias!