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shutvik [7]
3 years ago
11

PLZZZZZZZZZZ HELP QUICK!!!!!!!!!!!!

Physics
1 answer:
kifflom [539]3 years ago
8 0
In an atom of hydrogen the orbit radius is given by the formula:
r = n² · α₀

where:
n = number of orbit = 15
α₀ = Bohr radius (innermost radius) = 0.529 Â

Since d = 2 · r, we can write:
d = n² · d₀
   = 15² · 1.06
   =  238.5 Â

Hence, the <span>diameter of the fifteenth orbit of the hydrogen atom is 238.5 </span>Â.
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A cannon ball is fired with an initial velocity of 75 m/s at an angle of 58 degree above the ground. What maximum height will it
KiRa [710]

Answer:

h = 206.4 m

range = 515.9 m

Explanation:

from the question we are given the following:

initial velocity (u) = 75 m/s

angle  above surface = 58 degrees

acceleration due to gravity (g) = 9.8 m/s^{2}

find the maximum height (h) and the horizontal distance

maximum height (h) = \frac{u^{2}sinθ^{2}  }{2g}

h =  \frac{75^{2}sin58^{2}  }{2 x 9.8}

h = 206.4 m              

the horizontal distance here is the range

range = \frac{u^{2}sin2θ }{g}

range = \frac{75^{2}sin(2 x 58) }{9.8}

range = 515.9 m

7 0
3 years ago
The "Hangtime" or time spent in the air by a projectile is dependent on
jekas [21]

Answer:

Density.

Explanation:

8 0
3 years ago
Simlarity between longitudanal and transverse waves
babymother [125]

For transverse waves, the waves move in perpendicular direction to the source of vibration. For longitudinal waves, the waves move in parallel direction to the source of vibration . They are similar in the sense that energy is transferred in the form of waves.

8 0
3 years ago
A protostar's radius decreases by a factor of 100 and its surface temperature increases by a factor of two before it becomes a m
Sliva [168]

Answer:

L_f = K (\frac{r}{100})^2 * (2T)^4

L_f = K \frac{r^2}{10000} * 16 T^4

L_f = \frac{16}{10000} k r^2 T^4 = \frac{1}{625} k r^2 T^4

L_f = \frac{1}{625} L_i

So then we see that the final luminosity decrease by a factor of 625 so then the correct answer for this case would be:

B. Decreases by a factor of 625

Explanation:

For this case we can use the formula of luminosity in terms of the radius and the temperature given by:

L_i = K r^2 T^4

Where L_i = initial luminosity, r= radius and T = temperature.

We know that we decrease the radius by a factor of 100 and the temperature increases by a factor of 2 so then the new luminosity would be:

L_f = K (\frac{r}{100})^2 * (2T)^4

L_f = K \frac{r^2}{10000} * 16 T^4

L_f = \frac{16}{10000} k r^2 T^4 = \frac{1}{625} k r^2 T^4

L_f = \frac{1}{625} L_i

So then we see that the final luminosity decrease by a factor of 625 so then the correct answer for this case would be:

B. Decreases by a factor of 625

6 0
3 years ago
What type of force keeps the Earth in orbit around the Sun?
faust18 [17]
The answer is the suns gravity
5 0
4 years ago
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