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3 years ago

Which of the following is not sublimable? *

Physics

1 answer:

galina1969 [7]3 years ago

7 0

Answer:

where is your option ?

you can't write option so I think

sodium chloride is not sublimable

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Two stereo speakers mounted 4.52 m apart on a wall emit identical in-phase sound waves. You are standing at the opposite wall of

Delicious77 [7]

The answer is option c) 0.9 m

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3 years ago

A physicist drives through a stop light. When he is pulled over, he tells the police officer that the Doppler shift made the red

Alik [6]

Answer:

Speed of physicist car is 0.036c or 1.08 x 10⁷ m/s .

Explanation:

Doppler Effect is defined as the change in frequency or wavelength of the wave as the source or/and observer moving away or towards each other.

In this case, the Doppler effect equation in terms of wavelength is :

$\lambda_{s} = \lambda_{o}\sqrt{\frac{1-\frac{v}{c} }{1+\frac{v}{c} } }$ ......(1)

Here $\lambda_{s}$ is source wavelength, $\lambda_{o}$ is observed wavelength, v is speed of the observer and c is the speed of light.

Given :

Source wavelength, $\lambda_{s}$ = 660 nm = 660 x 10⁻⁹ m

Observed wavelength, $\lambda_{0}$ = 555 nm = 555 x 10⁻⁹ m

Substitute these values in the equation (1).

$555\times10^{-9} } = 660\times10^{-9} \sqrt{\frac{1-\frac{v}{c} }{1+\frac{v}{c} } }$

$\sqrt{\frac{1-\frac{v}{c} }{1+\frac{v}{c} } } = 0.84$

${\frac{1-\frac{v}{c} }{1+\frac{v}{c} } } = (0.84)^{2} = 0.7056$

$1-\frac{v}{c}=0.7056+0.7056\frac{v}{c}$

$\frac{v}{c}=\frac{0.2944}{8.056}$

$v = 0.036c=0.036\times3\times10^{8}$

v = 1.08 x 10⁷ m/s

8 0

3 years ago

12. Which of the following statements about

aliya0001 [1]

A seems to be correct

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2 years ago

What derived unit is used to measure the slope of the line in this graph?

vlabodo [156]

Answer:

C. g/cm³

Explanation:

The slope is measured by calculating the variation of the Y values over the X values between two points on a line.

So, the formula is: Slope = Δy/Δx

That means that we also take the units.

In this case, the Y-axis unit is in g, while the X-axis unit is in cm³.

Dividing a Y-variation over an X-variation will give you g/cm³.

In this case, let's assume the line passes through (10,100) (not exactly, but close enough for the example), and it passes through (0,0)

So the slope would be: (100-0) g / (10-0) cm³ = 10 g/cm³

3 0

3 years ago

A Porsche challenges a Honda to a 400-m race. Because the Porsche's acceleration of 3.5 m/s² is larger than the Honda's 3.0 m/s²

GarryVolchara [31]

Answer: The Porsche Wins. Arrives 19secs earlier before the Honda.

Explanation: The head start of 1secs corresponded with the difference in acceleration {3.5m/s² - 3m/s²}=0.5m/s²

Using the first equation of motion we obtain the velocity which correspond to this acceleration (0.5m/s²) and time of 1secs where initial velocity u = 0

V = u + at

V= 0 + at

V = 0.5 * 1 = 0.5m/s

Now let find the velocity of each of the car.

If V. a

0.5m/s 0.5m/s²

........m/s. 3.5m/s²

Velocity of porche Vp

= (3.5/0.5) * 0.5 = 3.5 m/s

Also if. V. a

0.5m/s. 0.5m/s²

.....m/s. 3 m/s²

Velocity of Honda Vh

= {3/0.5} * 0.5 = 3m/s

So let's find the time t taken by both cars to cover the distance of 400m

Recall,

Velocity = distance/time

Time t = distance/velocity

For Porche, t = 400/3.5 =114.29secs

For Honda, t = 400/3 = 133.33secs

Looking critically, we noticed that Porche car took shorter time.

The difference In time is

= (133.33 - 114.29)secs = 19.04secs

3 0

3 years ago