Posted by basit shah on Friday, July 29, 2011 at 4:16pm.
ten bricks each 6.0cm thick and mass of 1.5kg, lie on a table, how much work is required to stack them one on the top of another?
A. 40j
B. 88j
C. 45j
D. 0j
E. None of these

szabist imc larkana  Damon, Friday, July 29, 2011 at 5:44pm
original height of center of mass = 3 cm
final height of center of mass = 5^6 = 30cm
change in height of GC = 303 = 27 cm=.27m
work = m g h = 15 * 9.8 * .27 = 39.69 or 40 J so A