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3 years ago

In any energy transformation, there is always some energy that gets wasted as non-useful heat.

2 answers:

8 0

It is a completely false statement that in any energy transformation, there is always some energy that gets wasted as non-useful heat. The correct option among the two options that are given in the question is the second option. I hope that this is the answer that has actually come to your desired help.

Tema [17]3 years ago

8 0

The answer is true.

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The earth's magnetic field deflects the flow of current from?

alexgriva [62]

I don't really know the answer but maybe north pole and south pole?

7 0

3 years ago

A 120 g, 8.0-cm-diameter gyroscope is spun at 1000 rpm and allowed to precess. What is the precession period?

dolphi86 [110]

To solve this problem we will derive the expression of the precession period from the moment of inertia of the given object. We will convert the units that are not in SI, and finally we will find the precession period with the variables found. Let's start defining the moment of inertia.

$I = MR^2$

Here,

M = Mass

R = Radius of the hoop

The precession frequency is given as

$\Omega = \frac{Mgd}{I\omega}$

Here,

M = Mass

g= Acceleration due to gravity

d = Distance of center of mass from pivot

I = Moment of inertia

$\omega$ = Angular velocity

Replacing the value for moment of inertia

$\Omega= \frac{MgR}{MR^2 \omega}$

$\Omega = \frac{g}{R\omega}$

The value for our angular velocity is not in SI, then

$\omega = 1000rpm (\frac{2\pi rad}{1 rev})(\frac{1min}{60s})$

$\omega = 104.7rad/s$

Replacing our values we have that

$\Omega = \frac{9.8m/s^2}{(8*10^{-2}m)(104.7rad)}$

$\Omega = 1.17rad/s$

The precession frequency is

$\Omega = \frac{2\pi rad}{T}$

$T = \frac{2\pi rad}{\Omega}$

$T = \frac{2\pi}{1.17}$

$T = 5.4 s$

Therefore the precession period is 5.4s

7 0

3 years ago

An elevator traveled 15 floors (150 ft) at a speed of 4.5 m/s. What additional information is needed to determine the velocity o

vladimir2022 [97]

Answer:

Velocity is vector quantity.So it needs direction in addition to speed.

Explanation:

The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of its speed and direction of motion.

4 0

3 years ago

Find the momentum of a train with a mass of 850 kg and forward velocity of 15 m/s

LenKa [72]

Answer:

12,750

Explanation:

P = mv

Momentum = Mass x Velocity

Plug it in and finish equation

7 0

3 years ago

Read 2 more answers

A battery of voltage 9.0 V produces a current of 0.0175 A across a circuit. What is the resistance of the circuit?

Natalka [10]

Answer:

$514.288$

Explanation:

V=IR

R=V/I

R=9/0.0175

8 0

3 years ago