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3 years ago

Convert 15° C to fahrenheit and kelvin

Physics

2 answers:

earnstyle [38]3 years ago

5 0

Answer:

59 oF and 288 K

Explanation:

oF= 15 x 1.8 + 32= 59

K= 15+273 = 288

vivado [14]3 years ago

4 0

Answer:

59 degrees fahrenheit and 288.15 kelvin

Explanation:

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Suppose a ball is thrown vertically upwards from a position P above the ground. It rises to the highest point Q and returns to t

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3 years ago

Find the wavelength of the balmer series spectral line corresponding to n = 15.

Anna71 [15]

Answer:

371.2 mm

Explanation:

The Balmer series of spectral lines is obtained from the formula

1/λ = R(1/2² -1/n²) where λ = wavelength, R = Rydberg's constant = 1.097 × 10⁷ m⁻¹

when n = 15

1/λ = 1.097 × 10⁷ m⁻¹(1/2² -1/15²)

= 1.097 × 10⁷ m⁻¹(1/4 -1/225)

= 1.097 × 10⁷ m⁻¹(0.25 - 0.0044)

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3 years ago

An ideal Carnot refrigerator with a performance coefficient (COP) of 2.1 cools items inside of it to 5.0° C. What is the high te

otez555 [7]

Answer:

the high temperature needed to operate this refrigerator is C) 137.4° C

Explanation:

Hello!

The carnot refrigeration cycle is one in which a machine absorbs heat from an enclosure and expels it to the surroundings, the equation that defines the COP performance coefficient for this cycle is:

$COP=\frac{T1}{T2-T1}$

COP=performance coefficient =2.1

T1= Low temperature

T2=high temperature

Now use algebra to find the high temperature

$COP=\frac{T1}{T2-T1}\\(T2-T1)=\frac{T1}{COP}\\T2=\frac{T1}{COP}+T1\\T2=T1(\frac{1}{COP} +1)$

If we replace the values:

note = remember that the temperature must be in absolute units, for which we must add 273.15 to the low temperature to find the temperature in Kelvin

T1 = 5 + 273.15 = 278.15K

$T2=278.15(\frac{1}{2.1} +1)=410.60k$

In celsius

T2=410.60-273.15=137.4° C

the high temperature needed to operate this refrigerator is C) 137.4° C

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