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larisa86 [58]
2 years ago
12

The potential energy of a flying bird is 30.7 J. The kinetic energy of the bird is 128.4 J. What is the bird's Mechanical Energy

?
Physics
2 answers:
Brrunno [24]2 years ago
8 0

Answer:

we know formula for mechanical energy , E( Mechanical) = U + K , where U is the potential energy and K is the kinetic energy!

So E = 30.7 J + 128.4 J = 159.1 J

netineya [11]2 years ago
4 0

Answer:

159.1 J

Explanation:

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A person swings a 0.546-kg tether ball tied to a 4.56-m rope in an approximately horizontal circle. If the maximum tension the r
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Answer:

2.1 rad/s

Explanation:

Given that,

Mass of a tether ball, m = 0.546 kg

Length of a rope, l =  4.56 m

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We need to find the maximum angular speed of the ball. Let v is the linear velocity. The maximum tension is balanced by the centripetal force acting on it. It can be given by :

F=\dfrac{mv^2}{r}\\\\v=\sqrt{\dfrac{Fr}{m}} \\\\v=\sqrt{\dfrac{11\times 4.56}{0.546}} \\\\=9.584\ m/s

Let \omega is the angular speed of the ball. The relation between the angular speed and angular velocity is given by :

v=r\omega\\\\\omega=\dfrac{v}{r}\\\\=\dfrac{9.584}{4.56}\\\\=2.1\ rad/s

So, the maximum angular speed of the ball is 2.1 rad/s.

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