4,365 Answered Questions for the topic Science

Science Chemistry

12/08/20

Please help with this question, I would appreciate if you could explain your work where it needs explaining.
What is the molality of acetone in a solution composed of 255 g of acetone, (CH3)2CO, dissolved in 200 g of water?
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12/07/20

 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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12/07/20

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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12/07/20

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... more
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12/07/20

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.) more
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12/07/20

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... more
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12/07/20

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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12/06/20

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?... more
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12/06/20

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... more
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12/06/20

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... more
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Science Biology Chemistry

12/06/20

What are the charges, mass and location of each particle?

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Science Biology Chemistry

12/06/20

What are the charges, mass and location of each particle?

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Science Astronomy

12/06/20

Science about asteroids
Answer the following.1.Asteroids orbit the_____ _____ between Mars and Jupiter.2.explain what happens to a meteoroid in order for it to become a meteorite3.describe these parts of a comet: head,... more
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12/05/20

Find the air temperature (in K).
In a student laboratory exercise, the wavelength of a 52,300 Hz ultrasound wave is measured to be 0.660 cm. Find the air temperature (in K).
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Science Chemistry

12/05/20

A 20 mL of CO gas burn in 40 mL of O2, gas in a closed vessel according to the equation : 2CO+O2---->2CO2
A 20 mL of CO gas burn in 40 mL of O2, gas in a closed vessel according tothe equation : 2CO+O2---->2CO2What is the total volume of the gases (at STP) in the vessel after the end ofthe reaction... more
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Science Physics

12/05/20

If a person lifts a three times heavier object and travels twice the distance by factor, does the work by the person change? Why?

If a person lifts a three times heavier object and travels twice the distance by factor, does the work by the person change? Why? please help! Thank you!
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12/04/20

what is they of the cause/problem of Climate change 5 sentence

The cause: what is Climate change? That you care With a 5 sentence explanation of the cause/problem.
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12/04/20

N2 + 3H2 → 2NH3 How many grams of ammonia (NH3) is produced when 12grams of hydrogen react?

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12/04/20

How often must an adult Peregrine kill to support its young?
How often must an adult Peregrine kill to support its young?
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12/03/20

Approximately how many times louder is a 145-dB sound than a 85-dB sound?
Approximately how many times louder is a 145-dB sound than a 85-dB sound?
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12/03/20

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 (see the figure below). How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan... more
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Expert Answers •1

12/03/20

How far (in m) is the surface of the snow from the device?
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.(a)... more
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Expert Answers •1

12/03/20

What is the frequency (in Hz) of the tone being emitted? (Assume air temperature to be 20°C.)
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... more
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Expert Answers •1

12/03/20

What is the air temperature (in K)?
In a student laboratory exercise, the wavelength of a 52,300 Hz ultrasound wave is measured to be 0.660 cm. Find the air temperature (in K).
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Expert Answers •1

12/03/20

Calculate the wavelength of the resulting wave on the cable.
A steel cable with total length 68 m and mass 150 kg is connected to two poles. The tension in the cable is 2,039 N, and the wind makes the cable vibrate with a frequency of 2 Hz. Calculate the... more
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