Alessandra jumps on a trampoline. It takes her 1 second to
1 answer:
Answer:
The speed of Alessandra's motion is 2 ft/s up.
(C) is correct option.
Explanation:
Given that,
Time = 1 sec
Height = 2 feet
We need to calculate the speed of Alessandra's motion
Using formula of speed
Where, v = speed
d = height
t = time
Put the value into the formula
The direction will be up ward.
Hence, The speed of Alessandra's motion is 2 ft/s up.
(C) is correct option.
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Answer:
Explanation:
For this problem, we can use Boyle's law, which states that for a gas at constant temperature, the product between pressure and volume remains constant:
which can also be rewritten as
In our case, we have:
is the initial pressure
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is the final pressure
Solving for V2, we find the final volume:
Answer:
a)
b)
c) 0 J/K
d)S= 61.53 J/K
Explanation:
Given that
T₁ = 745 K
T₂ = 101 K
Q= 7190 J
a)
The entropy change of reservoir 745 K
Negative sign because heat is leaving.
b)
The entropy change of reservoir 101 K
c)
The entropy change of the rod will be zero.
d)
The entropy change of the system
S= S₁ + S₂
S = 71.18 - 9.65 J/K
S= 61.53 J/K
Answer:
5235.84 kg
Explanation:
There is one theorem - whose proof I will never remember without having to drag calculus in there - that says that the variation of momentum is equal to the force applied times the time the application last.
As long as the engine isn't ejecting mass - at this point it's a whole new can of worm - we know the force, we know the variation in speed, time to find the mass. But first, let's convert the variation of speed in meters per second. The ship gains 250 kmh,
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