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Alexeev081 [22]
3 years ago
5

Is cosine function always used to find x component velocity in resolving vectors

Physics
1 answer:
77julia77 [94]3 years ago
7 0

Answer:

━☆゚.*・。゚If <em>the angle is the angle between the eastern axis and the vector, then the leg adjacent the angle is the x-component and the leg opposite the angle is the y-component. Thus, the cosine function is used to calculate the x-component and the sine function is used to calculate the y</em>

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A student (m = 68 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a
Gnesinka [82]

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5.7141 m

Explanation:

Here the potential and kinetic energy will balance each other

mgh=\frac{1}{2}mv^2\\\Rightarrow v=\sqrt{2gh}

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t = Time taken = 0.04 seconds

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v=u+at\\\Rightarrow a=\frac{v-u}{t}

From Newton's second law

F=ma\\\Rightarrow F=m\frac{v-u}{t}\\\Rightarrow 18000=68\frac{0-\sqrt{2gh}}{0.04}\\\Rightarrow \frac{18000}{68}\times 0.04=-\sqrt{2\times 9.81\times h}\\\Rightarrow 10.58823=-\sqrt{2\times 9.81\times h}

Squarring both sides

112.11061=2\times 9.81\times h\\\Rightarrow h=\frac{112.11061}{2\times 9.81}\\\Rightarrow h=5.7141\ m

The height from which the student fell is 5.7141 m

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3 years ago
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si un disco fue lanzado con una fuerza de 1000 N, y el disc recorrió una distancia e o.6 m ¿Qué trabajo efectuó el lanzador ?
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Answer:

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Dados los siguientes datos;

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Sustituyendo en la ecuación, tenemos;

Trabajo \; realizado = 1000 * 0.6

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4 0
3 years ago
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