In thermodynamics, work of a system at constant pressure conditions is equal to the product of the pressure and the change in volume. It is expressed as follows:
W = P(V2 - V1)
W = 1.3x10^5 (2x6 - 6 )
<span>W = 780000 J
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Hope this answers the question. Have a nice day.
        
             
        
        
        
Answer:
She can swing 1.0 m high.
Explanation:
Hi there!
The mechanical energy of Jane (ME) can be calculated by adding her gravitational potential (PE) plus her kinetic energy (KE).
The kinetic energy is calculated as follows:
KE = 1/2 · m · v²
And the potential energy:
PE = m · g · h
Where: 
m = mass of Jane.
v = velocity.
g = acceleration due to gravity (9.8 m/s²).
h = height.
Then:
ME = KE + PE
Initially, Jane is running on the surface on which we assume that the gravitational potential energy of Jane is zero (the height is zero). Then:
ME = KE + PE      (PE = 0)
ME = KE
ME = 1/2 · m · (4.5 m/s)²
ME = m · 10.125 m²/s²
When Jane reaches the maximum height, its velocity is zero (all the kinetic energy was converted into potential energy). Then, the mechanical energy will be:
ME = KE + PE      (KE = 0)
ME = PE
ME = m · 9.8 m/s² · h
Then, equallizing both expressions of ME and solving for h:
m · 10.125 m²/s² =  m · 9.8 m/s² · h
 10.125 m²/s² / 9.8 m/s²  = h
h = 1.0 m
She can swing 1.0 m high (if we neglect dissipative forces such as air resistance).
 
        
             
        
        
        
I would say your answer to this question would be D
        
                    
             
        
        
        
Since this is a distance/time graph, the speed at any time is the slope 
of the part of the graph that's directly over that time on the x-axis.
At time  t1 = 2.0 s
That's in the middle of the first segment of the graph, 
that extends from zero to 3 seconds.
Its slope is  7/3 .              v1 = 7/3 m/s .
At time  t2 = 4.0 s
That's in the middle of the horizontal part of the graph 
that runs from 3 to 6 seconds. 
Its slope is zero. 
                                     v2 = zero .
At time  t3 = 13 s.
That's in the middle of the part of the graph that's sloping down, 
between 11 and 16 seconds.
Its slope is  -3/5 .            v3 = -0.6 m/s .