According to the scientific observation that energy is conserved in a "closed system,” no machine can do work on its surrounding
2 answers:
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Answer:
96.5 km/h south
Explanation:
The average velocity is given by:
where
d is the displacement
t is the time
We have:
d = 55 km
Therefore, the average velocity is
And the direction is the same as the displacement (south)
Answer:
Time observed by the astronaut = 2.388 hours
Distance traveled be according to an observer on Earth = 1.27 × 10¹¹ m
Distance traveled according to the astronaut = 2.52 × 10¹² m
Explanation:
Given:
Speed of the astronaut, v = 0.980c
time = 12.0 hr
now, from the time dilation formula we have
here
t' is the time observed by the astronaut
c is the speed of the light = 3 × 10⁸ m/s
thus,
or
t' = 2.388 hours
Now,
Distance = Velocity × time
The distance traveled be according to an observer on Earth will be
Distance = 0.980c × ( 12 × 60 × 60 )
or
D = 0.980 × 3 × 10⁸ × ( 12 × 60 × 60 )
or
Distance = 1.27 × 10¹¹ m
And, The distance traveled according to the astronaut will be
Distance = velocity × t'
or
D = 0.980 × 3 × 10⁸ × ( 2.388 × 60 × 60 )
or
Distance = 2.52 × 10¹² m