(a) How much work is done in lifting a 1.3-kg book off the floor to put it on a desk that is 0.6 m high? Use the fact that the acceleration due to gravity is g = 9.8 m/s². (b) How much work is done in lifting a 21-lb weight 6 ft off the ground? Solution (a) The force exerted is equal and opposite to that exerted by gravity, so the force is F = m = mg = (1.3) (9.8) = d²s dt² and then the work done is W = Fd = (0.6) = N J. (b) Here the force is given as F = 21 lb, so the work done is W = Fd = 21.6= ft-lb. Notice that in part (b), unlike part (a), we did not have to multiply by g because we were given the weight (which is a force) and not the mass of the object.
(a) How much work is done in lifting a 1.3-kg book off the floor to put it on a desk that is 0.6 m high? Use the fact that the acceleration due to gravity is g = 9.8 m/s². (b) How much work is done in lifting a 21-lb weight 6 ft off the ground? Solution (a) The force exerted is equal and opposite to that exerted by gravity, so the force is F = m = mg = (1.3) (9.8) = d²s dt² and then the work done is W = Fd = (0.6) = N J. (b) Here the force is given as F = 21 lb, so the work done is W = Fd = 21.6= ft-lb. Notice that in part (b), unlike part (a), we did not have to multiply by g because we were given the weight (which is a force) and not the mass of the object.
Related questions
Question
Fast pls solve this question correctly in 5 min pls I will give u like for sure
Sub
![(a) How much work is done in lifting a 1.3-kg book off the floor to put it on a desk that is 0.6 m high? Use the fact that the acceleration due to gravity is g = 9.8 m/s².
(b) How much work is done in lifting a 21-lb weight 6 ft off the ground?
Solution
(a) The force exerted is equal and opposite to that exerted by gravity, so the force is
F = m = mg = (1.3) (9.8) =
d²s
dt²
and then the work done is
W = Fd =
(0.6) =
N
(b) Here the force is given as F = 21 lb, so the work done is
W = Fd = 21.6=
ft-lb.
Notice that in part (b), unlike part (a), we did not have to multiply by g because we were given the weight (which is a force) and not the mass of the object.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc17b884f-da2a-4651-8d85-b5edcc64f900%2F5bf6f20a-eea9-4341-92e0-07054fe51c8d%2Fjkvu315_processed.jpeg&w=3840&q=75)
Transcribed Image Text:(a) How much work is done in lifting a 1.3-kg book off the floor to put it on a desk that is 0.6 m high? Use the fact that the acceleration due to gravity is g = 9.8 m/s².
(b) How much work is done in lifting a 21-lb weight 6 ft off the ground?
Solution
(a) The force exerted is equal and opposite to that exerted by gravity, so the force is
F = m = mg = (1.3) (9.8) =
d²s
dt²
and then the work done is
W = Fd =
(0.6) =
N
(b) Here the force is given as F = 21 lb, so the work done is
W = Fd = 21.6=
ft-lb.
Notice that in part (b), unlike part (a), we did not have to multiply by g because we were given the weight (which is a force) and not the mass of the object.
Expert Solution
![](/static/compass_v2/shared-icons/check-mark.png)
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 5 steps
![Blurred answer](/static/compass_v2/solution-images/blurred-answer.jpg)