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3 years ago

5

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

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