Abag of cement originally weighing 134 lb was lifted at a constant rate. as it rose, cement also leaked out at a constant rate. by the time the bag had been lifted to 15 ft, 12 of the cement had leaked out. how much work was done lifting the cement this far? (neglect the weight of the bag and lifting equipment.)

1920 lb-ft

Explanation:

Given

Weight of cement bag=134 lb

Cement leaked=12 lb

height =15 ft

Let Weight be a linear function of distance moved such that

w=-ax+b

at x=0 ,w=134 lb

at x=15, w=134-12=122 lb

Thus b=134 ,a=0.8

and work done is

W=1920 lb-ft

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .