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Nookie1986 [14]
2 years ago
8

How long would it take for a ball dropped from the top of a 576-foot building to hit the ground? round your answer to two decima

l places?
Physics
1 answer:
LUCKY_DIMON [66]2 years ago
4 0
If a ball is if a ball is dropped from a 576ft building it would take about 8 seconds for it to hit the ground.
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Which of the following is a unit of volume of solids?
Alla [95]

Answer:

Cubic meters is the unit of volume.

Explanation:

Volume :

Volume is the multiplication of height, width and length of the solids.

In mathematically term,

V = w\times l\times d

Where, w = width

h = height

l = length

Put the unit into the formula

V = m\times m\times m

V =m^3

This is the unit of volume.

We know that,

Square meters is the unit of area.

Liters per cubic gram is the unit of density.

Gram per cubic centimeter is the unit of density in CGS.

Hence, Cubic meters is the unit of volume.

4 0
3 years ago
Read 2 more answers
A photoelectric effect experiment finds a stopping potential of 1.93 V when light of wavelength 200 nm is used to illuminate the
PSYCHO15rus [73]

a) zinc

The equation of the photoelectric effect is:

E=\phi + K (1)

where

E is the energy of the incident light

\phi is the work function

K is the maximum kinetic energy of the emitted photoelectrons

Here the wavelength of the incident light is

\lambda=200 nm = 2\cdot 10^{-7} m

so the energy of the light is

E=\frac{hc}{\lambda}=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{2\cdot 10^{-7} m}=9.95\cdot 10^{-19} J

Converting into electronvolts,

E=\frac{9.95\cdot 10^{-19}}{1.6\cdot 10^{-19} J/eV}=6.22 eV (2)

The stopping potential is the potential needed to stop the photoelectrons with maximum kinetic energy: so, the electrical potential energy corresponding to the stopping potential (V=1.93 V) must be equal to the maximum kinetic energy of the photoelectrons,

U=q V = K

and since the charge of the electron is

1 q = 1 e

We have

K=(1 e)(1.93 V)=1.93 eV (3)

Combining (1), (2) and (3), we find the work function of the material:

\phi = E-K=6.22 eV-1.93 eV=4.29 eV

So, the cathode is most likely made of zinc, which has a work function of 4.3 eV.

b) The stopping potential does not change

As we said in part A), the stopping potential is proportional to the maximum kinetic energy of the photoelectrons, K.

The intensity of light is proportional to the number of photons that hit the surface of the metal. However, the energy of these photons does not depend on the intensity, but only on the frequency of the light.

Therefore, the energy of the photons (E) does not change when the intensity of light is doubled. Also, the work function \phi does not change: this means that the maximum kinetic energy of the photoelectrons, K, does not change, and so the stopping potential remains the same.

6 0
3 years ago
What would result from under-coverage? A. a lack of accurate result B. an incorrect independent variable C. an experiment D. acc
kherson [118]
 A. a lack of accurate <span>result</span>
3 0
3 years ago
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Which of the following is a true statement?
pishuonlain [190]

I think the answer is A.........

7 0
2 years ago
Which equation is used to calculate the weight of an object on a planet?
Kamila [148]

In this case to find the weight of an object you must use the formula.

W = mg

6 0
3 years ago
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