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3 years ago

Which device transforms electrical energy to mechanical energy

2 answers:

5 0

Examples of devices that convert electrical energy into mechanical energy — in other words, devices that use electrical energy to move something — include:

the motor in today’s standard power drills
the motor in today’s standard power saws
the motor in an electric tooth brushes
the engine of an electric car
the motor in a fan
the motor in a remote control cars that runs on batteries. So your answer would be B. Motorsport

geniusboy [140]3 years ago

4 0

The answer would be B. motor energy.

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A parallel-plate capacitor is charged by a 14.0 V battery, then the battery is removed. You may want to review (Pages 692 - 695)

Anika [276]

Answer:

Potential Difference = 14 V

Explanation:

We are told that when the capacitor plates are charged to a certain voltage, then we have;

ΔV = 14 volts

Now, the battery is disconnected, so here we have the potential difference between the plates to be given by the formula;

ΔV = Q/C

Now, the charge is conserved on the plates and the capacitance is constant, therefore in this case, the potential difference will remain the same.

Thus;

Potential Difference = 14 V

6 0

3 years ago

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.50 × 10 4 1.50×104 rad/s to an angular s

KATRIN_1 [288]

Answer:

0.32 s

Explanation:

Initial angular speed: $\omega_i = 1.50 \cdot 10^4 rad/s$

Final angular speed: $\omega_f = 3.35\cdot 10^4 rad/s$

Angular rotation: $\theta=2.02\cdot 10^4 rad$

The angular acceleration of the drill can be found by using the equation:

$\omega_f^2 - \omega_i^2 = 2 \alpha \theta$

Re-arranging it, we find $\alpha$ , the angular acceleration:

$\alpha = \frac{\omega_f^2 - \omega_i^2}{2\theta}=\frac{(3.35\cdot 10^4 rad/s)^2-(1.50\cdot 10^4 rad/s)^2}{2(2.02\cdot 10^4 rad)}=22,209 rad/s^2$

Now we want to know the time t the drill takes to accelerate from

$\omega_i =0$

$\omega_f = 6.90\cdot 10^4 rad/s$

This can be found by using the equation

$\omega_f = \omega_i + \alpha t$

where $\alpha$ is the angular acceleration we found previously. Solving for t,

$t=\frac{\omega_f - \omega_i}{\alpha}=\frac{22,209 rad/s^2}{6.90\cdot 10^4 rad/s}=0.32 s$

5 0

3 years ago

g the space in between two glass sheets has a volume of 0.025 m3. If the temperature of the gas is 290 K, what is the rms speed

Keith_Richards [23]

Complete Question

Argon gas (a monatomic gas) is sometimes used to insulate a double-pane window for purposes of insulation. In a particular window, the space in between two glass sheets has a volume of $0.025 \ m^3$ . If the temperature of the gas is 290 K. what is the rms speed of the gas atoms? The atomic mass of Argon is 39.9 u.(l u= 1.66x10-27 kg) Enter your answer in m/s

Answer:

The value is $V_{rms} = 425.75 \ m/s$

Explanation:

From the question we are told that

The volume of the space in between the two glass sheet is $a = 0.025 \ m^3$

The temperature of the gas is $T = 290 \ K$

The atomic mass of Argon is $m = 39.9 \ u = 39.9 * 1.66 *10^{-27} = 6.623 *10^{-26} \ kg$

Generally the root mean square velocity is mathematically represented as

$V_{rms} = \sqrt{\frac{3 K T}{ m } }$

Here K is the Boltzmann constant with value $k = 1.38 *10^{-23} \ m^3 \cdot kg \cdot s^{-2} \cdot K^{-1}$

$V_{rms} = \sqrt{\frac{3 * 1.38 *10^{-23} * 290 }{ 6.6234*10^{-26} } }$

=> $V_{rms} = 425.75 \ m/s$

3 0

3 years ago

Which of the following is the visible part of the spectrum of light?

mestny [16]

The visible spectrum is portion of the electromagnetic spectrum that is visible to the human eye.
gamma rays, sound waves, microwaves are not the part of spectrum of light, whereas color is the portion of spectrum of light.

6 0

3 years ago

Read 2 more answers

Help me please this is for physics

Yuri [45]

<h2>Hello there! :)</h2>

It's a pleasure to be helping you today with your physics question!

Answer:

$23.1m/s$