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makkiz [27]
3 years ago
8

The rear window of a van is coated with a layer of ice at 0°C. The density of ice is 917 kg/m3, and the latent heat of fusion of

water is 3.35 x 105 J/kg. The driver of the van turns on the rear-window defroster, which operates at 12 V and 28 A. The defroster directly heats an area of 0.44 m2 of the rear window. What is the maximum thickness of ice above this area that the defroster can melt in 4.5 minutes?
Physics
1 answer:
lara [203]3 years ago
6 0

Answer:

thickness of ice melted = 1.242*10^{-3} m

Explanation:

power delivered = V*I = 12 * 28 =    336 Watts

.

heat delivered = power * time = 336 W * 300 seconds =   168000 Joules

.

mass of ice melted = \frac{heat}{latent heat dffusion}

mass of ice melted = 97200 J / 335000 J/kg = 0.5014 kg

.

volume of ice melted = mass / density =  0.5014 / 917 = 5.46*10{-4} m3

.

thickness of ice melted = volume / area = 5.46*10{-4} / 0.44   =  1.242*10^{-3} m

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Recall the relationship between the charge on a capacitor and the potential difference across the capacitor. Use this relationsh
charle [14.2K]

Answer:

Answer in explanation.

Explanation:

The relationship between the charge on the capacitor and the potential difference across it is given as follows:

Q = CV

where,

Q = Charge on the Capacitor

C = Capacitance of the Capacitor

V = Potential Difference across the Capacitor

This relationship can be used to find the charge on a capacitor, using the voltmeter, as follows:

<u>The potential difference can be measured through the voltmeter. And the capacitance of the capacitor is a known constant value. Therefore, the charge can be found by taking product of both.</u>

8 0
3 years ago
Which unit of heat was originally defined in terms of the Fahrenheit temperature scale, not the Celsius scale?
Kitty [74]

Answer:

I think the answer would be British Thermal Unit

Explanation:

It equals one degree Fahrenheit and the equation for it is  1.055 × 103 joules.

8 0
3 years ago
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In a physics lab, light with a wavelength of 490 nm travels in air from a laser to a photocell in a time of 17.5 ns . When a sla
Gennadij [26K]

Answer:

196 nm

Explanation:

Given that

Value of wavelength, = 490 nm

Time spent in air, t(a) = 17.5 ns

Thickness of glass, th = 0.8 m

Time spent in glass, t(g) = 21.5 ns

Speed of light in a vacuum, c = 3*10^8 m/s

To start with, we find the difference between the two time spent

Time spent on glass - Time spent in air

21.5 - 17.5 = 4 ns

0.8/(c/n) - 0.8/c = 4 ns

Note, light travels with c/n speed in media that has index of refraction

(n - 1) * 0.8/c = 4 ns

n - 1 = (4 ns * c) / 0.8

n - 1 = (4*10^-9 * 3*10^8) / 0.8

n - 1 = 1.2/0.8

n - 1 = 1.5

n = 1.5 + 1

n = 2.5

As a result, the wavelength of light in a medium with index of refraction would then be

490 / 2.5 = 196 nm

Therefore, our answer is 196 nm

6 0
4 years ago
A helicopter (m = 3250 kg) is cruising at a speed of 56.9 m/s atan altitude of 185 m. What is the total mechanical energy of the
taurus [48]

Answer:

The mechanical energy of the helicopter is 1.12\times 10^7\ J.

Explanation:

It is given that,

Mass of the helicopter, m = 3250 kg

Speed of the helicopter, v = 56.9 m/s

Position of the helicopter, h = 185 m

The energy possessed by an object due to its motion is called its kinetic energy. It is given by :

E=\dfrac{1}{2}mv^2

E=\dfrac{1}{2}\times 3250\times (56.9)^2  

E=5.26\times 10^6\ J

The energy possessed by an object due to its position is called its potential energy. It is given by :

E=mgh

E=3250\times 9.8\times 185  

E=5.89\times 10^6\ J

The sum of kinetic and potential energy is called mechanical energy of the system. It is given by :

M=5.26\times 10^6+5.89\times 10^6

M=11.15\times 10^6\ J

or

M=1.12\times 10^7\ J

So, the mechanical energy of the helicopter is 1.12\times 10^7\ J. Hence, this is the required solution.

6 0
3 years ago
What is the genotype for a woman with no freckles?
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Well are having freckles recessive or dominant?
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3 years ago
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