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Lyrx [107]
3 years ago
5

PLZZZZ HELPPPPPP MEEEEEE!!!!!! ASAP!!! ILL GIVE 20 POINTS AND BRAINLIEST!!! :'(

Physics
1 answer:
leva [86]3 years ago
6 0

Answer:

I would choose A. and B

Explanation:

The parent and daughter elements are different and the number of atoms is not conserved.

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What is the direction of the electric field at the dot??
Georgia [21]
What is the magnitude of the electric field at the dot in the figure? (E=? V/m) What is the direction of the electric field at the dot in the figure? 1. to the left 2. to the right 3. upward 4. downward Thanks!
8 0
4 years ago
A radioactive substance decays at an annual rate of 131313 percent. If the initial amount of the substance is 325325325 grams, w
anyanavicka [17]

Answer: f_{(t)}=325(0.87)^{t}

Explanation:

If we have an initial amount of a radioactive material or substance, which is 325g,  and we also are told this amount decays 13\% each year, this means each year 87\% of the substance remains:

100\%-13\%=87\%=0.87

<u />

<u>To understand it better:</u>

Year 1: 325(87\%)=325(0.87)

Year 2: 325(0.87)(0.87)=325(0.87)^{2}

Year 3: 325(0.87)(0.87)(0.87)=325(0.87)^{3}

and so on until year t:

Year t: 325(0.87)^{t}

Therefore, the function tha best describes this radiation decay situation is:

f_{(t)}=325(0.87)^{t}

4 0
3 years ago
Prof. Marcia Grail, supervillain and superscientist, wishes to spy on her foes (they'll all pay!) from orbit. She wishes to be a
Sloan [31]

Answer:

563.64 m

Explanation:

Given that as per the question

x = 5 cm = 0.05 m

D = 4.2 × 107 m

d = smallest aperture size

As per the situation the solution of the smallest aperture telescope that she can get away with is below :-

We will use Rayleigh's diffraction limit which is

d\frac{x}{D} = 1.22\lambda

The equation will be

d\frac{0.05}{4.2\times 10^7} = 1.22[550\times 10^{-9}]

d = 563.64 m

So, the answer is d = 563.64 m

6 0
3 years ago
A cylinder is fitted with a piston, beneath which is a spring, as in the drawing. The cylinder is open to the air at the top. Fr
maw [93]

Answer:

x = 0.081 m.

Explanation:

a) To find how much does the atmospheric pressure cause the spring to compress we need to use the following equation:

F = k*x    (1)

<u>Where</u>:

F: is the force

k: is the spring constant = 3300 N/m

x: is the distance of compression =?

The force can be found as follows:

F = P*A    

<u>Where</u>:

P: is the atmospheric pressure = 101325 Pa

A: is the area of the piston = πr²

r: is the radius = 0.029 m

F = 101325 Pa*\pi*(0.029 m)^{2} = 267.7 N    

Now, from equation (1) we can find x:

x = \frac{F}{k} = \frac{267.7 N}{3300 N/m} = 0.081 m    

Therefore, the atmospheric pressure causes the spring to compress 0.081 m.      

I hope it helps you!

6 0
4 years ago
Ratio of velocity ratio​
Zolol [24]

Answer:

The ratio of a distance through which any part of a machine moves to that which driving part moves during the same time.

4 0
3 years ago
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