1,302 Answered Questions for the topic physical science
What is the current?
A lightning stroke lasts 0.03 s and involves a flow of 106 C.A lightning stroke lasts 0.03 s What is the current?
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Physical Science
12/09/20
A car travels north for 240 mi in 3 hours. What is the car's velocity?
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How much energy does it use in 50 min?
An electric clothes dryer is rated at 2,900 W. How much energy does it use in 50 min?
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What is its power consumption when the current flowing through the train's motor is 1,970 A?
An electric train operates on 875 V. What is its power consumption when the current flowing through the train's motor is 1,970 A?
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What is the eel's power output?
An electric eel can generate a 463-V, 0.4-A shock for stunning its prey. What is the eel's power output?
What is the heater's resistance?
A current of 25.5 A flows through an electric heater operating on 220 V. What is the heater's resistance?
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What is the current?
A lightning stroke lasts 0.03 s and involves a flow of 106 C. What is the current?
During 42 seconds of use, 210 C of charge flow through a microwave oven. Compute the size of the electric current.
During 42 seconds of use, 210 C of charge flow through a microwave oven. Compute the size of the electric current.
How many 2,300-W appliances can be plugged into the sockets without blowing the fuse?
All of the electrical outlets in a room are connected in a single parallel circuit. The circuit is equipped with a 20-A fuse, and the voltage is V = 120 V.What is the maximum total power that can...
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How many coulombs of charge flow through it during that time?
A current of 0.3 A goes through an electric motor for 5 min. How many coulombs of charge flow through it during that time?
The resistance of each brake lightbulb on an automobile is 7.0 Ω.
The resistance of each brake lightbulb on an automobile is 7.0 Ω.Cars have 12-V electrical systems to compute the current that flows in each bulb if they are connected in series. (For simplicity,...
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Physical Science
12/08/20
Can you please answer this for me? Been working on it for so long.
A water-balloon launcher with a mass of 1.75 kg is suspended on a wire. It fires a 1.25 kg balloon to the east at a velocity of 12.0 m/s. What is the resulting velocity of the launcher if the net...
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What is the speed of sound in neon?
A 530-Hz sound travels through pure neon. The wavelength of the sound is measured to be 0.82 m. What is the speed of sound in neon?
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What frequency of sound traveling in air at 20°C has a wavelength equal to 1.8 m, the average height of a person?
What frequency of sound traveling in air at 20°C has a wavelength equal to 1.8 m, the average height of a person?
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What is the size of the smallest feature observable in human tissue when examined with 19-MHz ultrasound?
Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of the ultrasound waves themselves. What is the size of the smallest feature observable in human...
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How far away are the fish?
A sound pulse emitted underwater reflects off a school of fish and is detected at the same place 0.25 s later (see the figure below). How far away are the fish? (Assume the water temperature is 20°C.)
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Approximately how many times louder is the latter sound?
The sound level measured in a room by a person watching a movie on a home theater system varies from 45 dB during a quiet part to 65 dB during a loud part. Approximately how many times louder is...
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Which of the following are waves that can travel without a medium?
Which of the following are waves that can travel without a medium? visible lightseismic waveswaves on a lakesound wavesx-raysradio waves
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Physical Science Physics
12/06/20
An ac generator is connected across the terminals of a 3.25-µF capacitor. Determine the frequency at which the capacitive reactance is 375 omega.
An ac generator is connected across the terminals of a 3.25-µF capacitor. Determine the frequency at which the capacitive reactance is 375 omega.
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How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan hears the sound?
A baseball fan sitting in the "cheap seats" is d = 122 m from home plate. How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan hears the sound?...
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How deep (in m) is the snow?
A sonic depth gauge is placed 4.2 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.023 seconds after it was emitted. The air temperature is −20°C.How...
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What is the frequency (in Hz) of the tone being emitted?
A person stands directly in front of two speakers that are emitting the same pure tone. The person then moves to one side until no sound is heard. At that point, the person is 7.15 m from one of...
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Physical Science
12/06/20
Tension at rest
The plastic bag to the right holds 2.5 kg of food. What isthe tension in each handle when it is held up at rest?
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Physical Science
12/06/20
Mass of the Spider
The spider is hanging at rest from a thread that has atension of 0.10 N. What is the mass of the spider?
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