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Yakvenalex [24]
3 years ago
15

An object with a mass of 21 kilograms is lifted through a distance of 7 meters how much work is done

Physics
1 answer:
Shtirlitz [24]3 years ago
4 0
We have: W = F × s
W = m×g×s
Here, m = 21 Kg  [ Given ]
g = 9.8 m/s²         [ constant value for earth system ] 
s = 7 ,                  [ Given ]

Substitute their values into the expression:
W = 21×9.8×7
W = 1440.6 Joules

In short, Your Final Answer would be 1440.6 J

Hope this helps!
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If we increase the temperature in a reactor by 54degrees Fahrenheit​ [°F], how many degrees Celsius​ [°C] will the temperature​
guajiro [1.7K]

Answer:

If we increase the temperature in a reactor by 54 degrees Fahrenheit​ [54°F], the temperature will increase by 12.22 degrees Celsius [12.22 ⁰C]

Explanation:

To determine the number of degrees Celsius the temperature will be increased, we convert from Fahrenheit to Celsius.

Converting from Fahrenheit to degree Celsius

54°F -----> °C

54 = 1.8°C + 32

54-32 = 1.8°C

22 = 1.8°C

°C = 22/1.8

    = 12.22 °C

Thus, 54°F -----> 12.22 °C

Therefore, If we increase the temperature in a reactor by 54degrees Fahrenheit​ [54°F], the temperature will increase by 12.22 degrees Celsius [12.22 ⁰C]

4 0
3 years ago
Read 2 more answers
You connect a 250-2 resistor, a 1.20-mH inductor, and a 1.80-uF capacitor in series across a 60.0-Hz, 120-V (peak) source. When
Basile [38]

Answer:

Explanation:

 reactance of inductor = wL = 2 X 3.14 X 60 X 1.2 X 10⁻³ = .45 ohm.

reactance of capacitor = 1/wC = 1/( 2 X 3.14 X 60 X 1.8 X 10⁻⁶ ) = 1474.4

Impedence of the circuit =[ R² + ( I/wC - wL)  ]¹/²  = [250² + ( 1474.4-.45 )]¹/²

Impedence = 1495 ohm.

RMS Voltage = 120/ 1.414 = 84.86 V

current = 84.86 / 1495 = 0.0576

Potential over resistance = 0.0576 x 250 = 14.2 V.

4 0
4 years ago
At the train station, you notice a large horizontal spring at the end of the track where the train comes in. This is a safety de
xxMikexx [17]

Answer:

  v₀ = 9,798 ft / s

Explanation:

We can solve this problem with kinematics in one dimension, when the train stops the speed is zero, the acceleration is negative so that the train stops. Let's use the equation

         v² = v₀² - 2 a d

         v = 0

         v₀ = √2 a d

In the problem it indicates that the acceleration is g / 2, we substitute

         v₀ = √2 (g / 2) d

Let's calculate

         v₀ = √ 2 32/2 3 = √32 3

         v₀ = 9,798 ft / s

8 0
4 years ago
A rugby player passes the ball 7.88 m across the field, where it is caught at the same height as it left his hand. (Assume the p
damaskus [11]

Explanation:

Given

Range of ball =7.88 m

Initial speed=13.1 m/s

and we know

Range of Projectile is

R=\frac{u^2sin2\theta }{g}

13.1=\frac{13.1^2\times sin2\theta }{9.8}

7.88\times 9.8=13.1^2\times sin2\theta

sin2\theta =0.4499

2\theta =26.74^{\circ}

\theta =13.37 ^{\circ}

(b)other angle would be complementary of \theta

=90-\theta =76.63 ^{\circ}

8 0
3 years ago
In the graph above, how does the acceleration at A compare with the acceleration at B?
abruzzese [7]
This is a speed/time graph.
The slope of the graph at each point is the time rate of change of speed
at that point, and THAT's the definition of the magnitude of acceleration.

The slope of the curve is zero at both ' A ' and ' B ', so acceleration is
zero at both of those points.

That seems to be exactly what choice-c says.
3 0
3 years ago
Read 2 more answers
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