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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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Delvig [45]

Answer:

X component of force is 60.62 N.

Y component of force is 35 N.

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Magnitude of normal force is 210 N.

Explanation:

Given:

Force of pull is, $F=70\ N$

Mass of the dog is, $m=25\ kg$

Angle of inclination is, $\theta =30$ °

Acceleration due to gravity is, $g=9.8\ m/s^2$

The free body diagram of the dog is shown below.

The X and Y components of force of pull is given as:

$F_X=F\cos \theta=(70)\cos (30)=60.62\ N\\F_Y=F\sin \theta=(70)\sin(30)=35\ N$

Therefore, the X and Y components of the force are 60.62 N and 35 N respectively.

Force of gravity on the dog is the product of its mass and acceleration due to gravity. Thus,

$F_g=mg=25\times 9.8=245\ N$

Therefore, the force of gravity on the dog is 245 N.

Now, consider the motion in the vertical direction of the dog. As there is no motion in the vertical direction, the net force along the Y direction is 0. In other words, the total Upward force is equal to the total downward force.

From the free body diagram,

$N+F_Y=mg\\N=mg-F_Y\\N=245-35=210\ N$

Therefore, the normal force acting on the dog is 210 N.

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4 years ago

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GarryVolchara [31]

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Explanation:

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statuscvo [17]

Answer:

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Explanation:

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