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Nezavi [6.7K]
3 years ago
15

A basketball player is 4.22 m from

Physics
2 answers:
lianna [129]3 years ago
5 0

Answer:

3.10 m

Explanation:

Given;

Initial speed of ball u = 9.20 m/s

Angle θ = 69°

Horizontal distance from goal d = 4.22m

Resolving the initial velocity into horizontal and vertical components;

The horizontal component of the initial velocity;

uh = ucosθ

Substituting the given values;

uh = 9.2cos69°

uh = 3.30 m/s

The time taken for it to cover the horizontal distance of 4.22 m (to reach the goal);

Time = distance/speed = d/uh

time = 4.22/3.30 =. 1.279s

The time taken to reach the goal is 1.279 seconds.

To determine the height of the ball, we will resolve the vertical component of the initial velocity;

Vertical component of the ball velocity is;

Uv = usinθ

Uv = 9.20sin69°

Uv = 8.59 m/s

Applying the equation of motion;

Height h = ut - 0.5gt^2

Velocity u = Uv = 8.59 m/s

Time t = 1.279s

Acceleration due to gravity g = 9.8 m/s^2

Substituting the values;

h = 8.69(1.279) - 0.5(9.8×1.279^2)

Height h = 3.0988891 = 3.10 m

The height of ball above the release point is 3.10m

max2010maxim [7]3 years ago
3 0

Answer: The height above the release point is 2.96 meters.

Explanation:

The acceleration of the ball is the gravitational acceleration in the y axis.

A = (0, -9.8m/s^)

For the velocity we can integrate over time and get:

V(t) = (9.20m/s*cos(69°), -9.8m/s^2*t + 9.20m/s^2*sin(69°))

for the position we can integrate it again over time, but this time we do not have any integration constant because the initial position of the ball will be (0,0)

P(t) = (9.20*cos(69°)*t, -4.9m/s^2*t^2 + 9.20m/s^2*sin(69°)*t)

now, the time at wich the horizontal displacement is 4.22 m will be:

4.22m = 9.20*cos(69°)*t

t = (4.22/ 9.20*cos(69°)) = 1.28s

Now we evaluate the y-position in this time:

h =  -4.9m/s^2*(1.28s)^2 + 9.20m/s^2*sin(69°)*1.28s = 2.96m

The height above the release point is 2.96 meters.

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The diagram illustrating this question is shown on the first uploaded image

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Complete Question

The complete question is shown on the first uploaded image

Answer:

Explanation:

From he question we are told that

    The first mass is   m_1 = 0.42kg

      The second mass is  m_2 = 0.47kg

From the question we can see that at equilibrium the moment about the point where the  string  holding the bar (where m_1 \ and \ m_2 are hanged ) is attached is zero  

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Looking at the diagram we can see that the tension T  on the string holding the bar where m_1  \  and   \ m_2 are hanged  is as a result of the masses (m_1 + m_2)

     Also at equilibrium the moment about the point where the string holding the bar (where (m_1 +m_2)  and  m_3 are hanged ) is attached is  zero

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 Making m_3 subject

          m_3 = \frac{(0.42 + 0.47) * 20 }{30 }

                m_3 = 0.59 kg

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