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3 years ago

5

Describe how the metal case of an electrical appliance is connected to earth

2 answers:

Misha Larkins [42]3 years ago

7 0

Anything that is medal is connected to earth

Pachacha [2.7K]3 years ago

3 0

This happens through the connection cord, that has 3 wires: 2 wires are used for power supply. The third wire is used to 'ground' the metal case, by connecting it to a special pin from the wall socket. The eletrical installation of the building connects all these ground pins to earth.

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At what rate does gravity cause objects to accelerate at sea level on earth

VLD [36.1K]

The acceleration due to gravity on Earth is 9.8 m/s per second.

5 0

3 years ago

A wheel rotates about a fixed axis with an initial angular velocity of 13 rad/s. During a 8-s interval the angular velocity incr

____ [38]

Answer:

The number of revolutions is 44.6.

Explanation:

We can find the revolutions of the wheel with the following equation:

$\theta = \omega_{0}t + \frac{1}{2}\alpha t^{2}$

Where:

$\omega_{0}$ : is the initial angular velocity = 13 rad/s

t: is the time = 8 s

α: is the angular acceleration

We can find the angular acceleration with the initial and final angular velocities:

$\omega_{f} = \omega_{0} + \alpha t$

Where:

$\omega_{f}$ : is the final angular velocity = 57 rad/s

$\alpha = \frac{\omega_{f} - \omega_{0}}{t} = \frac{57 rad/s - 13 rad/s}{8 s} = 5.5 rad/s^{2}$

Hence, the number of revolutions is:

$\theta = \omega_{0}t + \frac{1}{2}\alpha t^{2} = 13 rad/s*8 s + \frac{1}{2}*5.5 rad/s^{2}*(8 s)^{2} = 280 rad*\frac{1 rev}{2\pi rad} = 44.6 rev$

Therefore, the number of revolutions is 44.6.

I hope it helps you!

4 0

2 years ago

Which is equal to 4 hectometers?

Debora [2.8K]

Answer:

2. 0.4 kilometers

Explanation:

Hope it helps

8 0

3 years ago

The illustration shows ?

Iteru [2.4K]

Answer:

D)parallel circuit

Explanation:

the components are placed parallel from eachother

4 0

2 years ago

Read 2 more answers

An energy-saving light bulb has an efficiency of 45%. If 5W of light is emitted, what electrical power is required

Gwar [14]

Answer:

If you're using the bulb as a source of light, then it's. 14/60 = 23.3% efficient.

If you're using it to heat a bird nest or a hamster cage, then it's. 46/60 = 76.7% efficient !

It just depends on your point of view, and what you consider 'useful' output.

3 0

3 years ago