Một chất điểm chuyển động trong mặt phẳng Oxy với phương trình : { = 2 + 10
1 answer:
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Answer:
When they are approaching each other
When they are passing each other
When they are retreating from each other
Explanation:
From the question we are told that
The velocity of car one is
The velocity of car two is
The frequency of sound from car one is
Generally the speed of sound at normal temperature is
Now as the cars move relative to each other doppler effect is created and this can be represented mathematically as
Where is the velocity of the source of sound
is the velocity of the observer of the sound
is the actual frequence
is the apparent frequency
Considering the case when they are approaching each other
Substituting value
Considering the case when they are passing each other
At that instant
Substituting value
Considering the case when they are retreating from each other
Substituting value
Complete Question
The complete question is shown on the first uploaded image
Answer:
The electric field at that point is
Explanation:
From the question we are told that
The radius of the inner circle is
The radius of the outer circle is
The charge on the spherical shell
The magnitude of the point charge at the center is
The position we are considering is x = 0.60 m from the center
Generally the electric field at the distance x = 0.60 m from the center is mathematically represented as
substituting values
where k is the coulomb constant with value
substituting values
Answer:
39.240 W
Explanation:
Let's start by calculating the work done by the engine. We can assume that it is the same work done by the weight of the object to bring it from 40m to the surface: as much energy it takes to bring it up, the same ammount it takes to bring it down. Said work is
At this point we can simply apply the definition of power, that is , to get the power of the engine is