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emmainna [20.7K]
3 years ago
12

A 120 volt refrigerator uses 650 watts. Calculate how much work is done by the refrigerator in one hour.

Physics
2 answers:
Blababa [14]3 years ago
8 0

1 Watt = 1 joule/second

650 watts = 650 joules/second

(650 J/sec) x (3,600 seconds/1 hour)  =  <em>2,340,000 Joules/hour</em>

-BARSIC- [3]3 years ago
7 0

Answer:

C) 2,300,000 J

Explanation:

A 120 volt refrigerator uses 650 watts. Calculate how much work is done by the refrigerator in one hour.

A) 9.7 J

B) 39,000 J

C) 2,300,000 J

D) 4,100,000 J

power is the rate at which work is done by a machine.

work done is the product of force and distance,

it is also when energy is expended by a machine

energy can be dissipated by the refrigerator in form of heat

power=650W

time=3600 secs

work done will be 650*3600

2340000.

approximately 2300000J

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A microphone is located on the line connecting two speakers that are 0.513 m apart and oscillating in phase. The microphone is 1
pantera1 [17]

Answer:

frequency 1 = 334.30 Hz

frequency 2 = 1002.92 Hz

Explanation:

Given data

speaker distance y = 0.513 m

microphone distance D = 1.80 m

to find out

lowest two frequencies

solution

we know velocity of sound is 343 m/s

so we consider point x

so at 1st speaker distance from x   = D + (y/2)

1st speaker distance from x   = 1.80 + (0.513/2) = 2.0565 m   .....1

and

at 2nd speaker distance from x   = D - (y/2)

2nd speaker distance from x   = 1.80 - (0.513/2) = 1.5435 m     .........2

so destructive interference from 1 and 2  we know

1st - 2nd = ( m + 0.5 ) wavelength

2.0565 m - 1.5435 m = (  0+ 0.5) wavelength

wavelength  = 1.026 m

so here 1st min frequency will be

frequency 1 = velocity of sound / wavelength

frequency 1 = 343 / 1.026 =334.30 Hz

and

2nd  min frequency will be

frequency 2 =

2.0565 m - 1.5435 m = (  1 + 0.5) wavelength

wavelength  = 0.342 m

frequency 2 =  velocity of sound / wavelength

frequency 2 = 343 / 0.342 = 1002.92 Hz

7 0
3 years ago
A diagram of a closed circuit with power source on the left labeled 45 V, two resistors on the top labeled 2.0 Ohms and 3.0 Ohms
CaHeK987 [17]

Answer:

15

3A

Explanation:

ANSWER KEY

6 0
3 years ago
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When a magnetic field is first turned on, the flux through a 20-turn loop varies with time according to Φm=5.0t2−2.0t, where Φm
goldfiish [28.3K]

Answer:

A) ( - 200t + 40 ) volts

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Explanation:

Given data:

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iii) at t = 1

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iv) at t = 2

E = -400 + 40 =  - 360 ( clockwise direction )

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Answer:

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3 years ago
An element's atomic number is 55. How many protons would an atom of this element have?
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6 0
3 years ago
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