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3 years ago

Which identifies a machine that converts mechanical energy into electrical energy?

1 answer:

8 0

The answer is the option c. generator. Generator is a machine that converts mechanical energy into electricity. The way it is made is because the mechanical movement may be transformed in rotation of magnets placed inside a coiled wire, and this induces the movement of electrons through the coiled wire. As you know electricity is the flow of electrons.

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A uniform 1.4-kg rod that is 0.75 m long is suspended at rest from the ceiling by two springs, one at each end of the rod. Both

svetlana [45]

Answer:

7 deg

Explanation:

$m$ = mass of the rod = $1.4 kg$

$W$ = weight of the rod = $mg = (1.4) (9.8) = 13.72 N$

$k_{L}$ = spring constant for left spring = $59 Nm^{-1}$

$k_{R}$ = spring constant for right spring = $33 Nm^{-1}$

$x_{L}$ = stretch in the left spring

$x_{R}$ = stretch in the right spring

$L$ = length of the rod = 0.75 m

$\theta$ = Angle the rod makes with the horizontal

Using equilibrium of force in vertical direction for left spring

$k_{L} x_{L} = (0.5) W\\(59) x_{L} = (0.5) (13.72)\\x_{L} = 0.116 m$

Using equilibrium of force in vertical direction for right spring

$k_{R} x_{R} = (0.5) W\\(33) x_{R} = (0.5) (13.72)\\x_{R} = 0.208 m$

Angle made with the horizontal is given as

$\theta = tan^{-1}(\frac{(x_{R} - x_{L})}{L} )\\\theta = tan^{-1}(\frac{(0.208 - 0.116)}{0.75} )\\\theta = 7 deg$

3 0

4 years ago

A weight is hung from the ceiling of an elevator by a massless string. Under which circumstances will the tension in the cord be

Oduvanchick [21]

When the elevator is going up (assuming the elevator is acceleration)

When the elevator is accelerating downwards, the total gravitational force would be larger.

If the elevator is accelerating upwards, then the gravitation force would be smaller, thus the tension in the string would be smaller.

4 0

3 years ago

Assuming that the bridge segments are free to pivot at each intersection point, what is the tension T in the horizontal segment

Sergio039 [100]

Since the bridge and all segments of it are static, the sum of the torques acting on any portion of the bridge you choose is zero for any pivot point you may choose. See if you can find a rigid portion of the bridge and a wisely chosen pivot to which you can apply this powerful fact.
Consider the triangular portion shown in bold and let x be the pivot. (This choice eliminates the torques due to the tensions in the beams that attach at point x.) Find the torques on this left hand triangle (which can be considered a solid piece because of the connections). Remember that counterclockwise torque is positive. Assume that the horizontal segment above is being stretched, so that the force that the tension in this segment exerts on the bold triangle is directed to the right. Express the torque in terms of T, L , and Fp.

Answer in terms of T and L :
Tt = (TL.sqrt 3) / 2
Summation Tx = -LFp - T sqrt[L^2 - (L/2)^2]
The negative value of the tension shows that the segment is actually under a compressible load.

4 0

4 years ago

Determine la velocidad media de un móvil que lleva una velocidad inicial de 3m/s y su velocidad final es de 4.2m/s

Temka [501]

Answer: 3.6 m/s

Step-by-Step Answer:

Translated from Spanish to English for other English speaking students to benefit.

Question:

Determine the average speed of a mobile that has an initial speed of 3m/s and its final speed is 4.2m/s

To average anything, just put them into a fraction and divide their total by the number of things you want to average.

$\text{Because there are} 2 \text { speeds, and we want to average them, we divide their total by } 2 .$

$\frac { ( 3 + 4.2 ) \left[ \frac { m } { s } \right] } { 2 } = \frac { 7.2 \left[ \frac { m } { s } \right] } { 2 } = 3.6 \left[ \frac { m } { s } \right]$

En español

Para promediar cualquier cosa, solo póngalos en una fracción y divida su total por la cantidad de cosas que desea promediar.

Porque hay 2 velocidades, y queremos promediarlas, dividimos su total por 2.

$\frac { ( 3 + 4.2 ) \left[ \frac { m } { s } \right] } { 2 } = \frac { 7.2 \left[ \frac { m } { s } \right] } { 2 } = 3.6 \left[ \frac { m } { s } \right]$

4 0

3 years ago

Suppose a pendulum starts with a potential energy of 100 J. Assuming the pendulum has a height of 0 m at the bottom of its swing

WINSTONCH [101]

Answer:

The maximum kinetic energy is 100 Joules

Explanation:

Considering the pendulum as an isolated system, the kinematic energy will be conserved. The kinematic energy = (potential energy) + (kinetic energy). We know that it starts at rest (i.e., with kinetic energy being 0) with 100 Joules worth of potential energy. We also know that when the pendulum crosses the bottom point at 0m it has potential energy of 0 J implying its kinetic energy is 100 J, which is its maximum.

4 0

3 years ago