(II) An LR circuit can be used as a “phase shifter.” Assume that an “input” source voltage V = V 0 sin(2 πft + ϕ ) is connected across a series combination of an inductor L = 55 mH and resistor R . The “output” of this circuit is taken across the resistor. If V 0 = 24 V and f = 175 Hz, determine the value of R so that the output voltage V R lags the input voltage V by 25°. Compare (at a ratio) the peak output voltage with V 0 .
(II) An LR circuit can be used as a “phase shifter.” Assume that an “input” source voltage V = V 0 sin(2 πft + ϕ ) is connected across a series combination of an inductor L = 55 mH and resistor R . The “output” of this circuit is taken across the resistor. If V 0 = 24 V and f = 175 Hz, determine the value of R so that the output voltage V R lags the input voltage V by 25°. Compare (at a ratio) the peak output voltage with V 0 .
(II) An LR circuit can be used as a “phase shifter.” Assume that an “input” source voltage V = V0 sin(2πft + ϕ) is connected across a series combination of an inductor L = 55 mH and resistor R. The “output” of this circuit is taken across the resistor. If V0 = 24 V and f = 175 Hz, determine the value of R so that the output voltage VR lags the input voltage V by 25°. Compare (at a ratio) the peak output voltage with V0.
Steel train rails are laid in 13.0-m-long segments
placed end to end. The rails are laid on a winter
day when their temperature is -6.0° C.
Part A
How much space must be left between adjacent rails if they are just to touch on a summer day when their
temperature is 32.0°C?
Express your answer with the appropriate units.
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Part B
If the rails are originally laid in contact, what is the stress in them on a summer day when their temperature is
32.0°C?
Express your answer in pascals. Enter positive value if the stress is tensile and negative value if the
stress is compressive.
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A
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help me with this and the step I am so confused. It should look something like the figure i shown
Part A
In an effort to stay awake for an all-night study
session, a student makes a cup of coffee by first
placing a 200 W electric immersion heater in
0.250 kg of water.
How much heat must be added to the water to raise its temperature from 20.5° C to 95.0°C?
Express your answer in joules.
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Part B
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How much time is required? Assume that all of the heater's power goes into heating the water.
Express your answer in seconds.
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