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Nadusha1986 [10]
3 years ago
11

A spinning turbine can generate electricity only in the form of a/an _______ current.

Physics
1 answer:
lukranit [14]3 years ago
8 0

Answer:

A spinning turbine can generate electricity only in the form of an alternating current.

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Which of the following statement is not true about machines?
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A 14.3-g bullet is fired into a 5.21 kg block of wood. The block is attached to a spring that has a spring force constant of 450
Natasha2012 [34]

Answer:

The initial speed of the bullet is v_{o} = 889.199\,\frac{m}{s}.

Explanation:

The collision between bullet and block is inelastic and let suppose that motion occurs on a horizontal surface, so that changes in gravitational potential energy can be neglected. Initially, the intial speed of the bullet-block system can be determined with the help of the Work-Energy Theorem and the Principle of Energy Conservation:

K = U_{k} + W_{loss}

\frac{1}{2}\cdot (5.224\,kg)\cdot v^{2} = \frac{1}{2}\cdot \left(450\,\frac{N}{m}\right)\cdot (0.22\,m)^{2} + (0.35)\cdot (5.224\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right) \cdot (0.22\,m)

The initial speed of the bullet-block system is:

v \approx 2.383\,\frac{m}{s}

Now, the initial speed of the bullet is determined by applying the Principle of Momentum Conservation:

(0.014\,kg)\cdot v_{o} = (5.224\,kg)\cdot \left(2.383\,\frac{m}{s} \right)

v_{o} = 889.199\,\frac{m}{s}

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