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3 years ago

What is the molarity (concentration) of 25.2 grams of NaF dissolved in a total volume of 0.75 liters?

Physics

1 answer:

vodka [1.7K]3 years ago

6 0

Answer: concentration c = 25.2 g /(41.99 g/mol × 0.75 l)

Explanation: M(NaF) = 41.99 g/mol and amount of substance n = m/M.

Concentration c = n/V

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The acceleration of a particle moving along a straight line is given by a = −kt2 m/s2 where k is a constant and time t is in sec

RSB [31]

Answer:

$X - Xo = 54m$

k = 1/18

Explanation:

Data:

a = -k $t^{2}$ $\frac{m}{s^{2} }$

to = 0s Vo = 12m/s

t = 6s the particle chage it's moviment, so v = 0 m/s

We know that acceleration is the derivative of velocity related to time:

$a = \frac{dV}{dT}$

rearranging...

$a*dT = dV$

Then, we must integrate both sides:

$\int\limits^f_i {dV} \, dV =-k \int\limits^f_i {t^{2} } \, dT$

$V - Vo = -k\frac{t^{3} }{3}$

V = 0 because the exercise says that the car change it's direction:

$0 - 12 = -k\frac{6^{3} }{3}$

k = 1/6

In order to find X - Xo we must integer v*dT = dX

$V - Vo = -k\frac{t^{3} }{3}$

so...

$(Vo -k\frac{t^{3} }{3})dT = dX$

$\int\limits^f_i {dX} \, dX = \int\limits^f_i {Vo -k\frac{t^{3} }{3} } \, dT$

integrating...

$X - Xo = Vot -k\frac{t^{4} }{12}$

$X - Xo = 12*6 -\frac{1}{6}* \frac{6^{4} }{12}$

X - Xo = 54m

5 0

3 years ago

The frequency of a sound wave was measured to be 351 Hz. If you know that the speed of sound in air was 343 m/s, then determine

netineya [11]

Answer:

wavelength of the sound wave will be 0.977 m

Explanation:

We have given frequency of the sound wave f = 351 Hz

Speed of the sound wave v = 343 m/sec

We have to find the wavelength of the sound wave

We know that velocity of the sound wave is given by $v=\lambda f$

So wavelength of the sound wave $\lambda =\frac{v}{f}=\frac{343}{351}=0.977m$

So wavelength of the sound wave will be 0.977 m

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3 years ago

Which mathematical representation correctly identifies impulse? (1 point)

Xelga [282]

Answer:

Impulse = Force × Time

Explanation:

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2 years ago

Name THREE things that impact a collision.

Lapatulllka [165]

Answer:

The three types of impact that occur are those involving the vehicle, the body of the vehicle occupant, and the organs within the body of the occupant.

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3 years ago

Why does it hurt more to land on the wooden floor of a gym than on a padded mat?

Kaylis [27]

Answer:

The wooden floor exerts a greater force to give the same impulse as a padded mat.

Explanation:

-The wooden floor exerts a greater force for the same impulse as the padded mat.

-Unlike the wooded floor, the padded mat absorbs some of the energy when you fall. This in turn makes it exert less force on the body during the fall.

-Hence, you are less hurt when you fall on the padded floor.

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