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Lesechka [4]
2 years ago
12

Phobos's Orbit. Phobos orbits Mars at a distance of 9,380 km from the center of the planet and has a period of 0.3189 days. Assu

me that Phobos's orbit is circular. Calculate the mass of Mars. Express your answer in units of kg. (Hint: Use the circular orbit velocity formula ; remember to use units of meters, kilograms, and seconds.) Please round the answer to four significant digits. m
Physics
1 answer:
Elenna [48]2 years ago
4 0

Answer:

Explanation:

The relation between time period of moon in the orbit around a planet can be given by the following relation .

T² = 4 π² R³ / GM

G is gravitational constant , M is mass of the planet , R is radius of the orbit and T is time period of the moon .

Substituting the values in the equation

(.3189 x 24 x 60 x 60 s)²  = 4 x 3.14² x ( 9380 x 10³)³ / (6.67 x 10⁻¹¹ x M)

759.167 x 10⁶ = 8.25 x 10²⁰ x 39.43 / (6.67 x 10⁻¹¹ x M )

M = .06424  x 10²⁵

= 6.4 x 10²³ kg .

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Explain why atoms only emit certain wavelengths of light when they are excited. Check all that apply. Check all that apply. Elec
JulsSmile [24]

Answer:

Explanation:

Electrons are allowed "in between" quantized energy levels, and, thus, only specific lines are observed. <em>FALSE. </em>The specific lines are obseved because of the energy level transition of an electron in an specific level to another level of energy.

The energies of atoms are not quantized. <em>FALSE. </em>The energies of the atoms are in specific levels.

When an electron moves from one energy level to another during absorption, a specific wavelength of light (with specific energy) is emitted. <em>FALSE. </em>During absorption, a specific wavelength of light is absorbed, not emmited.

Electrons are not allowed "in between" quantized energy levels, and, thus, only specific lines are observed. <em>TRUE. </em>Again, you can observe just the transition due the change of energy of an electron in the quantized energy level

When an electron moves from one energy level to another during emission, a specific wavelength of light (with specific energy) is emitted. <em>TRUE. </em>The electron decreases its energy releasing a specific wavelength of light.

The energies of atoms are quantized. <em>TRUE. </em>In fact, the energy of all subatomic, atomic, and molecular particles is quantized.

7 0
3 years ago
What does it mean for a reaction to be endothermic? choose 2 of the following
Rainbow [258]

Answer: I would choose options C and D

Explanation:

3 0
2 years ago
Read 2 more answers
A photocell is based upon the photoelectric effect. A light beam illuminates a metallic plate, and under certain conditions elec
vova2212 [387]

Answer:

i) photons, they collide with the electrons

ii)when the energy of the photons is less than the work function there is no way to get out electrons

iii) he energy depends on the frequency in this Planck postulate

Explanation:

This exercise the photo cell is used for the photoelectric effect, this effect was explained by Einstein

i)  Where the light is supposed to act as a particular, therefore, it is called photons, they collide with the electrons and they can tear off the metal, with a collision it is very fast there is no measurable wait in the process.

ii) since we have a shock process, the equation must be fulfilled

          K = h f - Ф

where E = h f is the energy postulated by Plank and Ф the work function of the metal, therefore when the energy of the photons is less than the work function there is no way to get out electrons, which determines a threshold energy in the process

iii) From the same previous equation, the energy depends on the frequency in this Planck postulate, and not on the intensity squared as accepted in classical mechanics.

8 0
3 years ago
The vector matrix [6 -2] is rotated at different angles. Match the angles of rotation with the vector matrices they produce.
Georgia [21]

Answer:

Hello your question is incomplete hence I will give you a general answer as regards rotation of vector matrix assuming angle of rotation  = \frac{\pi }{4}

answer :

angle of rotation = \frac{\pi }{4}

vector matrix produced = attached below

Explanation:

lets assume the vector matrix [ 6, -2 ] is rotated clockwise by an angle of \frac{\pi }{4}

The resultant matrix = attached below

Result of the rotation =  attached below

attached below is the detailed solution

5 0
2 years ago
Counting atoms, please I put this question two times already and nobody has got it.
ella [17]

Answer:

ok just count the number of elements in each one…

UF4

1 U and 4 F

4+1 = 5

3Na2MoO4 = 3* (2Na + 1Mo + 4O) = 3* (2+1+4) = 7*3 = 21

BiOCl = 1 + 1 + 1 = 3

9 InN = 9* (1+1) = 9*2 = 18

NH4SCN = 1 + 4 + 1 + 1 + 1 = 8

5 * (3+4) = 5*7 = 35

NH4ClO3 = 1 + 4 + 1 + 3 = 9

NOHSO4 = 1 + 1 + 1 + 1 + 4 = 8

4H2 = 4*2 = 8

NbOCl3 = 1 + 1 + 3 = 5

3CF3SO3H = 3*(1 + 3 + 1 + 3 + 1) = 3*9 = 27

AgCNO = 1 + 1 + 1 + 1 = 4

6PbHAsO4 = 6 * (1 + 1 + 1 + 4) = 6*7 = 42

elements with more than one letter usually have the first letter uppercase, and the rest of the letters lowercase

such as Cl (Chlorine), As (Arsenic), Ag (silver)

whereas elements with only 1 letter just have that letter as a capital letter

such as H (hydrogen) S(sulfur) O(oxygen)

the letter behind the molecule/compound‘s formula is known as the coefficient.

for example, 4H2… 4 is the coefficient, so add the rest of the atoms and then multiply the whole thing by 4

2 atoms of hydrogen * 4 = 8

6 0
2 years ago
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