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3 years ago

If it takes 15 minutes to dry your hair with a 1.200 kW hair drier, how much energy is used in drying your hair?

Physics

2 answers:

Elodia [21]3 years ago

6 0

1.2 kW * 0.25 h = 0.300 kWh

Katen [24]3 years ago

5 0

Answer: Option (A) is the correct answer.

Explanation:

The given data is as follows.

Power = 1.200 kW, Time = 15 minutes = $\frac{15min}{60 min/hr}$ = 0.25 hour

Energy = ?

Thus, calculate the energy by using the formula as follows.

Power = $\frac{Energy}{Time}$

Energy = Power × Time

= 1.200 kW × 0.25 hr

= 0.300 kWh

Thus, we can conclude that 0.300 kWh energy is used in drying your hair.

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4 years ago

An office window has dimensions 3.1 m by 2.1 m. As a result of the passage of a storm, the outside air pressure drops to 0.954 a

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Answer:

Net forces which pushes the window is 30342.78 N.

Explanation:

Given:

Dimension of the office window.

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Area of the window = $(3.1\times 2.1) = 6.51\ m^2$

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Conversion of the pressure in its SI unit.

⇒ $1$ atm = $101325$ Pa

⇒ $0.046$ atm = $0.046\times 101325 =4660.95$ Pa

We have to find the net force.

We know,

⇒ Pressure = Force/Area

⇒ $Pressure=\frac{Force }{Area}$

⇒ $Force =Pressure\times Area$

⇒ Plugging the values.

⇒ $Force =4660.95\times 6.51$

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The net forces which pushes the window is 30342.78 N.

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4 years ago

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4 years ago

AM radio signals have frequencies between 550 kHz and 1600 kHz (kilohertz) and travel with a speed of 3.0Ã108m/s. What are the w

Westkost [7]

Answer:

The wavelength of these signals is as follow:

Wavelength of 550 kHz is 545.45 m
Wavelength of 1600 kHz is 187.5 m

Explanation:

Given that:

Frequency = 550 kHz & 1600 kHz

Velocity = 3.0 x 10⁸ m/s

As we know that frequency is expressed by the following equation:

Frequency = Velocity / Wavelength ---- (1)

For 550 kHz:

The equation can be rearranged as

Wavelength = Velocity / Frequency

Wavelength = (3.0 x 10⁸ m/s) / (550 x 1000 Hz)

Wavelength = 545.45 m

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Wavelength = Velocity / Frequency

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Wavelength = 187.5 m

5 0

4 years ago