Help with either I don’t understand this I know W=f*d but don’t get how it applies here
1 answer:
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Answer:
v= 0.2 m/s
Explanation:
Given that
m₁ = 50 kg
m₂ = 100 g = 0.1 kg
u =10 0 m/s
If there is no any external force on the system then the total linear momentum of the system will be conserve.
Initial linear momentum = Final momentum
m₁u₁ + m₂ u₂ =m₂ v₂ +m₁v₁
50 x 0 + 0.1 x 100 = 50 v + 0
0+ 10 = 50 v
v= 0.2 m/s
Therefore the recoil speed will be 0.2 m/s.
Answer:
18. Direction.
19. Speed.
20. Speed.
Explanation:
Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.
Mathematically, velocity is given by the equation;
Because the velocity of an object depends on direction as well as speed, the velocity of an object can change even as the speed of the object remains constant. Thus, the velocity would change only when the direction or speed of the object changes.
Answer: ok, so total time is Tt = 6.65 seconds = time falling + time of sound traveling.
the time of the rock falling is given by: (1)
where h is the heigth of the hole, and t₀ is the time it took to reach the bottom.
the time of the sound traveling is given by 343*t₁ - h = 0 (2)
so t₁ + t₀ = 6.65s = total time
then you know that t₁ = 6.65s - t₀
so now you have two variables, t₀ and h, and we want to know the value of h, so we want to write t₀ as a function of h.
in the second equation we have now: 343*(6.65 - t₀) = h
so t₀ = (-h/343 + 6.65)s
replacing this on the first equation you have:
now you want to take h to the right side so
w
so if we replace g by 9.8 meters over seconds square we get
h =
where you will take the positive root
h = 61 meters