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3 years ago

A stone is dropped from rest from the top of a building. It takes Î”t = 2.2 s for it to reach the ground.

Physics

1 answer:

NeTakaya3 years ago

6 0

Answer:

Value of magnitude of acceleration will be $9.8m/sec^2$

Explanation:

It is given that when a stone is dropped it takes 2.2 sec to reach the ground

(a) As the stone is dropped from the top of building

So its initial velocity $u_i$ will be 0 m /sec

(b) As the stone is free falling and there is no external force applied on it so its acceleration will be equal to acceleration due to gravity

So value of magnitude of acceleration will be equal to $9.8m/sec^2$

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Goryan [66]

Answer:

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2 years ago

The energy required to dislodge electrons from cesium metal via the photoelectric effect is 207 kJ/mol . What wavelength (in nm)

ki77a [65]

Answer:

So wavelength in nm will be $\lambda =0.956\times 10^{-19}nm$

Explanation:

We have given that the energy = 207 KJ/mol $=207\times 10^3j/mol$

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

Plank's constant $h=6.6\times 10^{-34}J-s$

According to plank's rule energy of the photon is given by

$E=\frac{hc}{\lambda }$

$207\times 10^3=\frac{6.6\times 10^{-34}\times 3\times 10^8}{\lambda }$

$\lambda =0.956\times 10^{-28}m$

So wavelength in nm will be $\lambda =0.956\times 10^{-19}nm$

6 0

3 years ago

9) If, after viewing a specimen at low power, you switch to high-dry power and, after using fine focus, cannot find the specimen

xeze [42]

Answer:

See the answer below

Explanation:

The best thing one can do in this case would be to return the microscope's objective to low power and then re-center the specimen before switching back to high-dry power.

Most of the time, what makes the specimen under the microscope to be out of focus at higher objective powers after being in focus at low power is because they are not properly centered on the stage. Hence, before calling on the instructor, it would be wise to first return to low power, re-center the specimen and bring it into focus after which the high power objective can be returned to and the fine focus adjusted to bring the image back to focus.

After doing the above and the specimen still does not come into focus, then the instructor can be called upon.

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3 years ago

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I'd say a from opinion but its answer is d

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3 years ago

A 2-kg girl sits on a carousel 0.5 m away from the axis of rotation. If the centripetal force is 80 N, what is the

Wewaii [24]

Answer:

40M/S

Explanation:

BY CALCULATION USING THE FORMULA S=FD

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3 years ago