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svetoff [14.1K]
3 years ago
14

Suppose 3 neutrons are released by an atom of U-235 in the first stage of a fission chain reaction. Each of these neutrons has e

nough energy to cause another fission reaction in another nucleus of U-235, releasing more neutrons. And if all of those 2nd stage neutrons cause other nuclei to fission in a 3rd stage, how many total U-235 atoms will have undergone fission after these 3 stages of the chain reaction?
A. 27
B. 9
C. 11
D. 12
Physics
2 answers:
8090 [49]3 years ago
5 0
Is not A.) 27 don't know the answer but it is not (A)
DIA [1.3K]3 years ago
4 0
The answer is A.) 27<span />
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A plane drops a rubber raft to the survivors of a shipwreck. The plane is flying at a height of 1960 m and with a speed of 109 m
Korolek [52]

In this case the rubber raft has horizontal and vertical motion.

Considering vertical motion first.

We have displacement  s = ut +\frac{1}{2}at^2, u = Initial velocity, t = time taken, a = acceleration.

In vertical motion

    s = 1960 m, u = 0 m/s, a = 9.81 m/s^2

    1960 = 0*t+\frac{1}{2} *9.81*t^2\\ \\ t = 20 seconds

So raft will take 20 seconds to reach ground.

Now considering horizontal motion of raft

u = 109 m/s, t = 20 s, a = 0m/s^2

So s = 109*20+\frac{1}{2} *0*20^2 = 2180 m

So shipwreck was 2180 meter far away from the plane when the raft was dropped.

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3 years ago
A 500-g lump of clay is dropped onto a 1-kg cart moving at 60 cm/s. The clay is moving downward at 30 cm/s just before l dith t
viktelen [127]

Answer:

The speed of the cart and clay after the collision is 50 cm/s .

Explanation:

Given :

Mass of lump , m = 500 g = 0.5 kg .

Velocity of lump , v = 30 cm/s .

Mass of cart , M = 1 kg .

Velocity of cart , V = 60 cm/s .

We know by conservation of momentum :

mv+MV=(m+M)v'

Here , v' is the speed of the cart and clay after the collision .

Putting all value in above equation .

We get :

0.5\times 30+1\times 60=(0.5+1)\times v'\\\\v'=\dfrac{15+60}{1.5}\\\\v'=50\ cm/s

Hence , this is the required solution .

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3 years ago
An object is placed at zero zero on a Number line. It moves three units to the right, then four units to the left, and then 60 u
STatiana [176]

Answer:

the displacement of the object is 5 units

Explanation:

The computation of the displacement of the object is shown below:

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Hence, the displacement of the object is 5 units

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Lifting book over your head is what type of energy
AleksandrR [38]

Answer:

potential energy

Explanation:

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Artyom0805 [142]

Answer: Air

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Roffns dn b bdd

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