A 100-kg spacecraft has a sail of area 300 m2 that is absorbing sunlight of intensity 800 W/m2.What is the resulting acceleration of the spacecraft?

A) 2.4 m/s2 B) 2.7 × 10-6 m/s2 C) 8.0 × 10-6 m/s2 D) 3.8 × 10-5 m/s2 A) 2.4 m/s2 B) 2.7 × 10-6 m/s2 C) 8.0 × 10-6 m/s2 D) 3.8 × 10-5 m/s2

Exam 21: Alternating-Current Circuits and Electromagnetic Waves

Star #1 is approaching the Earth with speed v.Star #2 is receding from the Earth with the same speed v.Measurements of the same spectral line from each of the stars show Doppler shifts in frequency.The light from which star will have the larger magnitude shift in frequency?

(Multiple Choice)

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Question 81

An observer is moving in space toward a distant star at 50.0 km/s while the star is moving toward the observer at 180 km/s;the relative velocity being 230 km/s of approach.What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00 × 10⁵ km/s).

(Multiple Choice)

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Question 82

An AC series circuit contains a resistor of 30.0 Ω,a capacitor of 1.22 μF and an inductor of 154 mH.What frequency should be used to create a resonance condition in the circuit?

(Multiple Choice)

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Question 83

An RLC circuit is connected across an AC power source.How are the maximum and rms voltages from the power source related?

(Multiple Choice)

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Question 84

What is the effective (rms)current value for an AC current with an amplitude of 15.4 A?

(Multiple Choice)

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Question 85

A 100-kg spacecraft has a sail of area 300 m² that is absorbing sunlight of intensity 800 W/m².What is the resulting acceleration of the spacecraft?

(Multiple Choice)

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Question 86

What is the maximum value of the electric field E at 1.5 m from a 102-W light bulb radiating in all directions? (µ₀ = 4π × 10−⁷ T⋅m/A,c = 3.00 × 10⁸ m/s)

(Multiple Choice)

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Question 87

Resonance occurs in an AC series circuit when which of the following conditions is met?

(Multiple Choice)

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Question 88

Maxwell guessed that visible light was an electromagnetic wave because of its:

(Multiple Choice)

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Question 89

In order of increasing frequency,which of the following is correct?

(Multiple Choice)

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Question 90

Which of the following combinations of circuit components can be used to make a tuner for a radio,to select the desired frequency?

(Multiple Choice)

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Question 91

A resistor,inductor,and capacitor are connected in series,each with an effective (rms)voltage of 63 V,176 V,and 65 V,respectively.What is the magnitude of the phase angle in this circuit?

(Multiple Choice)

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Question 92

In an RLC series circuit,if the AC frequency is decreased to a very small value,what value does the phase angle between the current and voltage approach?

(Multiple Choice)

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Question 93

A resistor and capacitor are connected in series with an applied AC voltage source.Separate voltmeter readings across the resistor and capacitor give values of 23 V and 29 V (rms),respectively.What is the effective (rms)voltage of the source?

(Multiple Choice)

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Question 94

In an RL circuit,which of the following is a possible magnitude of a phase angle?

(Multiple Choice)

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Question 95

A resistor,inductor and capacitor are connected in series,each with effective (rms)voltage of 80.0 V,160 V,and 84.0 V,respectively.If the resistor is rated at 15.0 Ω,what is the average power dissipated in the circuit?

(Multiple Choice)

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Question 96

A radio wave transmits 1.59 W/m² average power per unit area.What is the peak value of the associated magnetic field? (μ₀ = 4π × 10−⁷ T⋅m/A and c = 3.00 × 10⁸ m/s)

(Multiple Choice)

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Question 97

An AC series circuit contains a resistor of 20.0 Ω,an inductor of 74.0 mH and a variable capacitor.If the frequency of the applied voltage is 423 Hz,to what setting should the capacitor be set if resonance is achieved?

(Multiple Choice)

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Question 98

In an LCR series circuit with X_L > X_C,the phase angle between the current and voltage phasors is 30°.If the AC frequency doubles,what is the magnitude of the resulting phase angle?

(Multiple Choice)

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Question 99

An engineer designed a transformer to convert 120 V (rms) to 6.0 V (rms). The number of turns in the primary is 540, and the secondary current is 610 mA at an output voltage of 6.0 V (rms). -How many turns are in the secondary?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 122

Exam 21: Alternating-Current Circuits and Electromagnetic Waves

Star #1 is approaching the Earth with speed v.Star #2 is receding from the Earth with the same speed v.Measurements of the same spectral line from each of the stars show Doppler shifts in frequency.The light from which star will have the larger magnitude shift in frequency?

An AC series circuit contains a resistor of 30.0 Ω,a capacitor of 1.22 μF and an inductor of 154 mH.What frequency should be used to create a resonance condition in the circuit?

An RLC circuit is connected across an AC power source.How are the maximum and rms voltages from the power source related?​

What is the effective (rms)current value for an AC current with an amplitude of 15.4 A?

A 100-kg spacecraft has a sail of area 300 m2 that is absorbing sunlight of intensity 800 W/m2.What is the resulting acceleration of the spacecraft?

What is the maximum value of the electric field E at 1.5 m from a 102-W light bulb radiating in all directions? (µ0 = 4π × 10−7 T⋅m/A,c = 3.00 × 108 m/s)

Resonance occurs in an AC series circuit when which of the following conditions is met?

Maxwell guessed that visible light was an electromagnetic wave because of its:

In order of increasing frequency,which of the following is correct?

Which of the following combinations of circuit components can be used to make a tuner for a radio,to select the desired frequency?

A resistor,inductor,and capacitor are connected in series,each with an effective (rms)voltage of 63 V,176 V,and 65 V,respectively.What is the magnitude of the phase angle in this circuit?

In an RLC series circuit,if the AC frequency is decreased to a very small value,what value does the phase angle between the current and voltage approach?

A resistor and capacitor are connected in series with an applied AC voltage source.Separate voltmeter readings across the resistor and capacitor give values of 23 V and 29 V (rms),respectively.What is the effective (rms)voltage of the source?

In an RL circuit,which of the following is a possible magnitude of a phase angle?

A resistor,inductor and capacitor are connected in series,each with effective (rms)voltage of 80.0 V,160 V,and 84.0 V,respectively.If the resistor is rated at 15.0 Ω,what is the average power dissipated in the circuit?

A radio wave transmits 1.59 W/m2 average power per unit area.What is the peak value of the associated magnetic field? (μ0 = 4π × 10−7 T⋅m/A and c = 3.00 × 108 m/s)

An AC series circuit contains a resistor of 20.0 Ω,an inductor of 74.0 mH and a variable capacitor.If the frequency of the applied voltage is 423 Hz,to what setting should the capacitor be set if resonance is achieved?

In an LCR series circuit with XL > XC,the phase angle between the current and voltage phasors is 30°.If the AC frequency doubles,what is the magnitude of the resulting phase angle?

An engineer designed a transformer to convert 120 V (rms) to 6.0 V (rms). The number of turns in the primary is 540, and the secondary current is 610 mA at an output voltage of 6.0 V (rms). -How many turns are in the secondary?

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An RLC circuit is connected across an AC power source.How are the maximum and rms voltages from the power source related?

A 100-kg spacecraft has a sail of area 300 m² that is absorbing sunlight of intensity 800 W/m².What is the resulting acceleration of the spacecraft?

What is the maximum value of the electric field E at 1.5 m from a 102-W light bulb radiating in all directions? (µ₀ = 4π × 10−⁷ T⋅m/A,c = 3.00 × 10⁸ m/s)

A radio wave transmits 1.59 W/m² average power per unit area.What is the peak value of the associated magnetic field? (μ₀ = 4π × 10−⁷ T⋅m/A and c = 3.00 × 10⁸ m/s)

In an LCR series circuit with X_L > X_C,the phase angle between the current and voltage phasors is 30°.If the AC frequency doubles,what is the magnitude of the resulting phase angle?