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mariarad [96]
3 years ago
6

A chemistry student needs of 40mL diethylamine for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the s

tudent discovers that the density of diethylamine is 0.7 . Calculate the mass of diethylamine the student should weigh out. Round your answer to significant digits.
Physics
1 answer:
Elza [17]3 years ago
3 0

Explanation:

Mass = density × volume

m = (0.7 g/mL) × (40 mL)

m = 28 g

Rounding to 1 significant figure, the student should weigh out 30 grams of diethylamine.

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hoa [83]

Answer:

Because of the speed of the sound.

Explanation:

The first thing that happens in such cases is to take into account the speed of the sound. First, we see that the player hits the ball with the bat, if we are in the stands far enough we will hear the sound of the batting time later, this time depends on the speed of the sound which is equal to 345 [m/s].

Another visible and practical example is a fireworks display, where people nearby immediately hear the explosion. while those at a great distance will be able to see first the explosion followed by the sound.

With the following equation, we can calculate how long it takes to hear a hit or explosion

t = x / v

where:

x = distance [m]

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7 0
3 years ago
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kenny6666 [7]

Answer:

Hello your question is incomplete attached below is the complete question

Answer : x ( acceleration of mass 4m ) = \frac{g}{7}

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Explanation:

Given data:

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first we have to express the kinetic and potential energy equations

The general kinetic energy of the system can be written as

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also the general potential energy can be expressed as

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next we will take the Euler-Lagrange equation for the generalized equations :

Euler-Lagrange  equation = 4x-y =0\\-2y+x +g = 0

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x ( acceleration of mass 4m ) = \frac{g}{7}

The top pulley rotates because it has to keep the center of mass of the system at equilibrium

8 0
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Andreas93 [3]
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CaHeK987 [17]

Answer: Try C

Explanation:

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