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ivanzaharov [21]
3 years ago
15

Initially, a particle is moving at 5.25 m/s at an angle of 35.5° above the horizontal. Three seconds later, its velocity is 6.0

3 m/s at an angle of 56.7° below the horizontal. What was the particle's average acceleration during these 3.00 seconds in the x-direction (enter first) and the y-direction?
Physics
1 answer:
ivolga24 [154]3 years ago
6 0

Answer:

 a =( -0.32 i ^ - 2,697 j ^)  m/s²

Explanation:

This problem is an exercise of movement in two dimensions, the best way to solve it is to decompose the terms and work each axis independently.

Break down the speeds in two moments

initial

  v₀ₓ = v₀ cos θ

  v₀ₓ = 5.25 cos 35.5

v₀ₓ = 4.27 m / s

   v_{oy} = v₀ sin θ

 v_{oy}= 5.25 sin35.5

v_{oy} = 3.05 m / s

Final

vₓ = 6.03 cos (-56.7)

vₓ = 3.31 m / s

v_{y} = v₀ sin θ

v_{y} = 6.03 sin (-56.7)

v_{y} = -5.04 m / s

Having the speeds and the time, we can use the definition of average acceleration that is the change of speed in the time order

    a = (v_{f} - v₀) /t

    aₓ = (3.31 -4.27)/3

    aₓ = -0.32 m/s²

    a_{y} = (-5.04-3.05)/3

   a_{y} =  -2.697 m/s²

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Yakvenalex [24]

Answer:

Before: 0 m/s  

After: -4 m/s

Explanation:

Before: Since you and your beau started at rest, your beau initial velocity is 0 m/s.

After: Since we have to conserve momentum,

momentum before push = momentum after push.

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So, m₁v₁ + m₂v₂ = 0

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8 0
3 years ago
The table shows the decay in a 59 g sample of bismuth 212 overtime.
Vikki [24]

Answer: C

14.75g

Explanation:

Given that the half life time = 60.5s

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At time t = 0, No = 59g

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A student wearing frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 47 N. How f
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Answer:

7.53 m

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Force, F = 47 N

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Let the distance traveled by the student is s.

According to the work energy theorem,

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Force x distance = final kinetic energy - initial kinetic energy

F x s = kf - ki

47 x s = 354

s = 7.53 m

4 0
3 years ago
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