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3 years ago

If an object is moving, then the magnitude of its ____ cannot be zero.

1 answer:

7 0

If an object is moving, then its speed and the magnitude
of its velocity aren't zero.

If its velocity is constant (speed doesn't change and it's
moving in a straight line), then its acceleration is zero.

Looks like choice-D sums it up nicely.

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Which sound is most likely the most intense

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4 years ago

The unit of work is a fundamental derived unit.<br>

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3 years ago

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3 years ago

The work function of a metal surface is 4.80 × 10-19 J. The maximum speed of the electrons emitted from the surface is vA = 7.7

poizon [28]

Answer:

$\lambda_A=2.65177\times 10^{-7}\ m$

$\lambda_B=3.32344\times 10^{-7}\ m$

Explanation:

h = Planck's constant = $6.63\times 10^{-34}\ m^2kg/s$

c = Speed of light = $3\times 10^8\ m/s$

m = Mass of electron = $9.11\times 10^{-31}\ kg$

$W_0$ = Work function = $4.8\times 10^{-19}\ J$

$v_A$ = Velocity of A particle = $7.7\times 10^5\ m/s$

$v_B$ = Velocity of B particle = $5.1\times 10^5\ m/s$

The wavelength is given by

$\lambda=\frac{hc}{\frac{1}{2}mv^2+W_0}$

$\lambda_A=\frac{6.63\times 10^{-34}\times 3\times 10^8}{\frac{1}{2}9.11\times 10^{-31}(7.7\times 10^5)^2+4.8\times 10^{-19}}\\\Rightarrow \lambda_A=2.65177\times 10^{-7}\ m$

The wavelength $\lambda_A=2.65177\times 10^{-7}\ m$

$\lambda_B=\frac{6.63\times 10^{-34}\times 3\times 10^8}{\frac{1}{2}9.11\times 10^{-31}(5.1\times 10^5)^2+4.8\times 10^{-19}}\\\Rightarrow \lambda_B=3.32344\times 10^{-7}\ m$

The wavelength $\lambda_B=3.32344\times 10^{-7}\ m$

5 0

4 years ago

What will this be ? Help me out

Nana76 [90]

Answer:

7: C 8:All of These

Explanation:

Im almost 100% sure on both of these. Feedback is like critism and you'll get nowhere focusing on all good and no bad. You can't go to the doctor on your own if you're a child for technically it's both yours and your parents. Your teacher is responsible for notifying your parents and you are responsible for telling your teacher.

8 0

3 years ago