Question #8d57a

1 Answer
Apr 23, 2016

Answer:

#A)weight=800N#
#B)work=24000J#
#C)Power=600Wa#

Explanation:

#A)#
#"weight=mass.gravity acceleration"#
#G=weight#
#m=mass#
#g=10(N)/(k)g#
#G=m*g#
#m=80kg#
#G=80*10#
#G=800N" weight of beam"#

#B)#
#Work=Force*distance#
#Work=W#
#Force=G#
#distance=h#
#W=G*h#
#G=800N" "h=30m#
#W=800*30#
#W=24000J#

#C)#
#Power="Work done"/"time"#

#Power=P#

#"Work done=W"#

#time=t#

#P=W/t#

#W=24000J" "t=40s#

#P=24000/40#

#P=600Wa#