Mark accidentally falls out of a helicopter that is traveling 15 m/s. He plunges into a swimming pool 2 seconds later. Assuming
2 answers:
Answer:
Distance, d = 30 m
Explanation:
It is given that,
Mark accidentally falls out of a helicopter that is traveling with a speed of, v = 15 m/s
He plunges into a swimming pool, t = 2 seconds later.
We have to find the horizontal distance between Mark and the swimming pool when he fell from the helicopter.
Speed is defined as the distance travelled per unit time i.e.
d is the distance travelled
d = 30 m
Hence, the distance between Mark and the swimming pool when he fell from the helicopter is 30 m
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A) Time needed: 6.24 s
B) Time needed: 2.86 s
Explanation:
A)
In this part, we are told that the power if the engine is constant. The power of the engine is given by
where
W is the work done
t is the time
This means that the power of the engine is proportional to the work done, and therefore, to the kinetic energy of the car:
where m is the mass of the car and v its velocity.
SInce power is constant, we can write:
where:
is the time the car needs to accelerates to
is the time the car needs to accelerate to
Therefore, solving for ,
B)
First of all, we have to calculate the acceleration of the car. We can do it using the following equation:
where:
u = 0 is the initial velocity
is the final velocity
t = 1.40 s is the time elapsed
Substituting, we find the acceleration:
In this part, we are told that the force exerted by the engine is constant: according to Newton's second law, acceleration is proportional to the force,
This means that the acceleration is also constant.
Now we want to find how long the car takes to accelerate to a final velocity of
From an initial velocity of
u = 0
Using again the same suvat equation, and using the acceleration we found previously, we find:
Learn more about accelerated motion:
About power:
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