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AVprozaik [17]
3 years ago
14

a 45 kg ice skater initially skating at a velocity of 3 m/s speeds up to a velocity of 5 m/s. calculate the difference in the ma

gnitude of momentum of the skater.
Physics
2 answers:
ad-work [718]3 years ago
4 0

Answer: 90 kgm/s

Explanation:

The momentum (linear momentum) p is given by the following equation:

p=m.V

Where:

m=45 kg is the mass of the skater

V is the velocity

In this situation the skater has two values of momentum:

Initial momentum: p_{1}=m.V_{1}

Final momentum: p_{2}=m.V_{2}

Where:

V_{1}=3 m/s

V_{1}=5 m/s

So, if we want to calculate the difference in the magnitude of the skater's momentum, we have to write the following equation(assuming the mass of the skater remains constant):

p=p_{2}-p_{1}=m.V_{2}-m.V_{1}

p=m(V_{2}-V_{1})

p=45 kg(5 m/s - 3 m/s)

Finally:

p=90 kgm/s

ExtremeBDS [4]3 years ago
4 0

Answer: 90m

Explanation:I hope this helps

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FrozenT [24]

Answer:

t = 4 s

Explanation:

As we know that the particle A starts from Rest with constant acceleration

So the distance moved by the particle in given time "t"

d = v_i t + \frac{1}{2}at^2

d = 0 + \frac{1}{2}(65.5)t^2

d_1 = 32.75 t^2 cm

Now we know that B moves with constant speed so in the same time B will move to another distance

d_2 = 44 \times t

now we know that B is already 349 cm down the track

so if A and B will meet after time "t"

then in that case

d_1 = 349 + d_2

32.75 t^2 = 349 + 44 t

on solving above kinematics equation we have

t = 4 s

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3 years ago
How does Mercury's close proximity to the sun and thin atmosphere affect its ability to maintain liquid water
alekssr [168]

Answer

A thin atmosphere does not supply much oxygen, and the heat from the sun would evaporate it, because mercury is close to the sun.

5 0
3 years ago
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For the answer to the question above, each horse's force forms a right angle triangle with the barge and subtends an angle of 60/2 = 30°. The resultant in the direction of the barge's motion is:
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An African Swallow, flying with a horizontal velocity of 80 m/s due North, drops a coconut from a height of 8 m. When does the c
Vesnalui [34]

Answer:

The coconut hit the ground after 1.28 s

Explanation:

Velocity: This can be defined as the rate of change of displacement. Or it is defined as speed in a specified direction. Velocity is a vector quantity. The S.I unit of velocity is m/s.

Using the equation of motion,

S = ut + 1/2gt²....................................... Equation 1

Where S = distance, u = initial velocity, t = time, g = acceleration due to gravity

<em>Given: s= 8 m, u = 0 m/s ( because it was drop from a height), </em>

<em>Constant :   g = +9.8 m/s²</em>

<em>Substituting these values into equation 1,</em>

<em>8 = 0×t + 1/2(9.8×t²)</em>

<em>8 = 4.9t²</em>

<em>t² = 8/4.9</em>

<em>t = √1.63</em>

<em>t = 1.276 s</em>

t = 1.28 s

Therefore the coconut hit the ground after 1.28 s

6 0
3 years ago
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