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Vedmedyk [2.9K]
3 years ago
15

A baseball player standing on a platform throws a baseball out over a level playing field. The ball is released from a point 3.5

0 m above the field with an initial speed of 14.3 m/s at an upward angle of 27.0 degrees above the horizontal. What horizontal distance will the ball travel before hitting the ground?
Physics
1 answer:
givi [52]3 years ago
7 0

Answer:

22.1 m

Explanation:

v_{o} = initial speed of ball = 14.3 m/s

\theta = Angle of launch = 27°

Consider the motion of the ball  along the vertical direction.

v_{oy} = initial speed of ball = v_{o} Sin\theta = 14.3 Sin27 = 6.5 ms^{-1}

a_{y} = acceleration due to gravity = - 9.8 ms⁻²

t  = time of travel

y  = vertical displacement = - 3.50 m

Using the kinematics equation that suits the above list of data, we have

y = v_{oy} t + (0.5) a_{y} t^{2} \\- 3.50 = (6.5) t + (0.5) (- 9.8) t^{2}\\- 3.50 = (6.5) t - 4.9 t^{2}\\t = 1.74 s

Consider the motion of the ball along the horizontal direction.

v_{ox} = initial speed of ball = v_{o} Cos\theta = 14.3 Cos27 = 12.7 ms^{-1}

X  = Horizontal distance traveled

t  = time taken = 1.74 s

Since there is no acceleration along the horizontal direction, we have

X = v_{ox} t\\X = (12.7)(1.74)\\X = 22.1 m

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Read 2 more answers
A single mass (m1 = 3.5 kg) hangs from a spring in a motionless elevator. The spring constant is k = 278 N/m. 1)What is the dist
artcher [175]
<h2>Answer:</h2>

0.126m

<h2>Explanation:</h2>

According to Hooke's law, the force (F) acting on a spring to cause an extension or compression (e) is given by;

F = k x e            -------------------(i)

Where;

k = the spring's constant.

From the question, the force acting on the spring is the weight(W) of the mass. i.e

F = W               -----------------------(ii)

<em>But;</em>

W = m x g;

where;

m = mass of the object

g = acceleration due to gravity [usually taken as 10m/s²]

<em>From equation (ii), it implies that;</em>

F = W = m x g

<em>Now substitute F = m x g into equation(i) as follows;</em>

F = k x e

m x g = k x e      ------------------(iii)

<em>From the question;</em>

m = m1 = 3.5kg

k = 278N/m

<em>Substitute these values into equation (iii) as follows;</em>

3.5 x 10 = 278 x e

35 = 278e

<em>Now solve for e;</em>

e = 35/278

e = 0.126m

Therefore, the distance the spring is stretched from its unstretched length (which is the same as the extension of the spring) is 0.126m

3 0
3 years ago
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