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3 years ago

Please answer this. Science 7th grade.

Physics

1 answer:

USPshnik [31]3 years ago

6 0

I think the answer should be a I’m not sure tho

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You illuminate a slit with a width of 0.0549 mm with a light of wavelength 735 nm and observe the resulting diffraction pattern

spayn [35]

Answer:

Explanation:

Given

slit width $d=0.0549\ mm$

wavelength of light $\lambda =735\ nm$

Screen is placed at a distance of $D=2.85\ m$

The angle for the first minima is given by

$\sin \theta _1=\frac{m\lambda }{d}$

for m=1

$\sin \theta _1=\frac{1\times 735\times 10^{-9}}{0.0549\times 10^{-3}}$

$\sin \theta _1=0.0133$

and one half of central maxima is given by

$Y=D\sin \theta _1$

$Y=2.85\times 0.0133$

$Y=0.0381\ m$

Width of central maxima $=2Y$

$Width=0.0762\ m\approx 7.62\ cm$

8 0

4 years ago

A 6.0-kg object, initially at rest in free space, "explodes" into three segments of equal mass. Two of these segments are observ

sladkih [1.3K]

Answer:

$Q = 2000 J$

Explanation:

As we know that the 6 kg object was at rest initially

So here since net force on the system is zero

so the momentum of the system will always remains conserved

so we can say

$0 = P_1 + P_2 + P_3$

now we know that

$P_1 = P_2 = P$

and the angle between the two objects is 60 degree

so we can say

$\vec P_1 + \vec P_2 = \sqrt{P_1^2 + P_2^2 + 2P_1 P_2cos60}$

$\vec P_1 + \vec P_2 = \sqrt{P^2 + P^2 + 2P^2(0.5)} = \sqrt3 P$

now we can say that the speed of the third mass will be

$v_3 = \sqrt 3 (20) m/s$

now the total kinetic energy released in this system is given as

$Q = \frac{1}{2}mv_1^2 + \frac{1}{2}mv_2^2 + \frac{1}{2}mv_3^2$

$Q = \frac{1}{2}(2)(20^2) + \frac{1}{2}(2)(20^2) + \frac{1}{2}(2)(20\sqrt3)^2$

$Q = 2000 J$

3 0

4 years ago

A timline is necessary :

kolezko [41]

Answer:

A. For every goal

Explanation:

A timeline is necessary for every goal set, be it academic, life, high school, personal, and the like. A timeline is an important part of goal setting. It helps determine what should be done by a certain time to ensure that you will reach your goal. Although some goals can take a long time to reach, a timeline will be your constant reminder of what needs to be done.

When setting a timeline, you also need to take in consideration what you want to achieve. You need to set a realistic timeline as many usually underestimate the obstacles they may face in pursuing their goals.

8 0

4 years ago

True or False. The two metals in a battery are the electrolytes.<br> True<br> False

liubo4ka [24]

Falseeeeeeeeeeeeeeeeeeeeeeeeeeeee

6 0

3 years ago

Read 2 more answers

If an object falls for 4 seconds, how fast is it going when it hits the ground?

MArishka [77]

Acceleration due to gravity is about 9.8 m/s²

So after every second, the speed increase by 9.8 m/s

After 1 second, the object would fall at a speed of 9.8 m/s

After 2 seconds the object would fall at a speed of 19.6 m/s

So after 4 seconds, the object is going to be at a speed of:

9.8 x 4 = 39.2 m/s

-------------------------------------------------

<u>Answer</u>

39.2 m/s

3 0

4 years ago