How many cycles have been completed after 3 seconds on the graph
1 answer:
You might be interested in
Answer:
°C
Explanation:
Given:
mass of hiker, m= 63 kg
height to be climbed, h= 828 m
energy produced by an energy bar,
heat capacity of the hiker,
initial body temperature of hiker,
<em>The efficiency of converting the energy content of the bars into the work of climbing is 25%, the remaining 75% of the energy released through metabolism is heat released to her body.</em>
We find the energy required for climbing 828 m height:
W=m.g.h
W= 511207.2 J
∵Hike eats 2 energy bars=
Energy produced
Now, according to her efficiency:
Total energy required for producing the work of W= 511207.2 J which is required to climb the given height will be (say, E):
&
Amount of total energy (E) converted into heat(Q) is:
As we know that:
heat, .................(1)
where:
is the final temperature
Putting respective values in the eq. (1)
°C
Answer:
270 m
Explanation:
We can find the distance travelled by the car by using the following suvat equation:
where
s is the distance travelled
u is the initial velocity
v is the final velocity
t is the time
For the car in this problem,
u = 0
v = 45 m/s
t = 12 s
Substituting into the equation, we find:
Answer:
427.392 kJ
Explanation:
m = Mass of gas = 4.5 kg
Initial temperature = 200 K
Final temperature = 360 K
R = Mass specific gas constant = 296.8 J/kgK
= Specific heat ratio = 1.5
Work done for a polytropic process is given by
The work input during the process is -427.392 kJ