Question

1.A man pulls a box to a distance of 5 m along a horizontal floor through a cord attached to the box which makes an angle of 39° with the horizontal. How much work is done if the force exerted on the cord is 60N?(with solution)

2.How much work is done in lifting a 19.6N box from the floor to the top of a table 0.8m high?(with solution)

3.What power will be required to raise a 14,700N steel beam to a height of 14 meters in 10 minutes?(with solution)​

Answer 1

Answer:

1. 11700 joule

2. 15.68

3. 343

Answer 2

Explanation:

Given 1. A man pulls a box to a distance of 5 m along a horizontal floor through a cord attached to the box which makes an angle of 39° with the horizontal. How much work is done if the force exerted on the cord is 60 N?(with solution)

2. How much work is done in lifting a 19.6 N box from the floor to the top of a table 0.8 m high?(with solution)

3. What power will be required to raise a 14,700 N steel beam to a height of 14 meters in 10 minutes?(with solution)

• 1. So  
•          F = 60 N
•           s = 5 m
•            theta = 39 degree
• Work done is  
•                      W = F s cos theta
•                                  = 60 x 5 x cos 39
•                                  = 300 x 0.77714
•                              W = 233.143 J
• 2. So we need to find the work done by an object.
•            F = 19.6 N
•            s = o.8 m
•         W = F x s
•             = 19.6 x 0.8
•           W = 15.68 N-m
•            W = 15.68 J
• 3. So we need too find the power.
• Now work done will be
•           F = 14,700 N
•           s = 14 m
•      W = F x s
•           = 14,700 x 14
•           = 205800 N-m
•       W = 205800 J
• So t = 10 min
•         1 min is 60 secs
•         10 min = 60 x 10
•                     = 600 secs
•           Power P = W / t
•                          = 205800 J / 600 s
•                   P = 343 W

Reference link will be

https://brainly.ph/question/18581272