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4 years ago

What problim in flywheel

Physics

1 answer:

Gwar [14]4 years ago

8 0

Answer:

There are several tell-tale signs that there is a problem with either the starter or flywheel that is preventing your car from starting or causing starting issues. Free spinning is when, for some reason, the starter gear is just spinning without contacting anything. The sound is similar to that of a small drill spinning.

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A 1.98 kg mass is set on a spring, and the spring compression an amount 4.78 cm. what is the spring constant?

Zielflug [23.3K]

Well, the spring constant is measured using the F=k∆x, where F is the force, k is the constant, and ∆x is the change in position. So if the mass is 1.98, the force (mxg) is 19.4. Thus the spring constant is 19.4/.0478(change in position). This equals 405.86.

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4 years ago

Explain what an exoskeleton is and what it is made of.

sergey [27]

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3 years ago

78 million in standard form

Leviafan [203]

Answer:

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3 years ago

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Lapatulllka [165]

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3 years ago

A 14,92kw , 400 v , 400 r.p.m . Dc shunt motor draws a current of 40A when running at full-load. The moment of inertia of the ro

Lostsunrise [7]

First we determine the motor's efficiency - a ratio of the mechanical output power and the electrical input power:

$E = \frac{P_out}{P_in}=\frac{14920W}{U\cdot I}=\frac{14920W}{400V\cdot 40A}=0.93$

The output mechanical power is directly proportional to torque and angular speed. From this relationship we can isolate the torque:

$P_{out}=\tau \cdot\omega=E\cdot P_{in}=E\cdot I \cdot U\\\implies\tau = \frac{I \cdot U \cdot E}{\omega}=\frac{I\cdot U\cdot E\cdot 60}{2\pi\cdot \omega_{rpm}}$

whereby the last expression uses the angular speed in rpm units.

(a) we calculate the torque, given that the motor draws 1.2 times the rated current, i.e., 48 Amps:

$\tau = \frac{I\cdot U\cdot E\cdot 60}{2\pi\cdot \omega_{rpm}}=\frac{48A\cdot 400V\cdot0.93\cdot 60}{2\pi \cdot 400 rpm} = 426.3 Nm$

(b) use formula for the acceleration time:

$t_{start} = \frac{j\cdot \omega_{rpm}}{\frac{60}{2\pi}\cdot \tau}=\frac{7.5\frac{kg}{m^2}\cdot 400rpm}{9.55\cdot 426.3kg\frac{m^2}{s^2}}\approx 0.74s$

The startup time will be 0.74s

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3 years ago