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4 years ago

Which item is an example of a lever?

Physics

2 answers:

Sphinxa [80]4 years ago

8 0

Scissors have levers on them.

Sav [38]4 years ago

6 0

The scissors are an example of a lever

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Post-exposure radiation levels are approximately Normally distributed. The levels (in Sv) of a random sample of three trauma vic

Ierofanga [76]

Answer:

0.404

Explanation:

The calculation of confidence interval for the mean is shown below:-

Data provided in the question

Mean = 5.5

The Standard deviation for three values is 0.7

Since there is 95% of the confidence interval so the critical value is

$t_{0.025.5} = 4.303\\$

Now

Margin error is

$t_{0.025.5} = 4.303\times \frac{s}{\sqrt{n} }$

$= 4.303\times \frac{0.7}{\sqrt{3} }$

= 1.74

Now,

The Standard error is

$= \frac{s}{\sqrt{n} }$

$= \frac{0.7}{\sqrt{3} }$

= 0.404

Hence, the confidence interval for the mean based is 0.404

5 0

3 years ago

A double-slit interference pattern is observed on a screen 1.0 m behind two slits spaced 0.30 mm apart. From the center of one p

Pie

Answer:

The wavelength of the light is 530 nm.

Explanation:

Given that,

Distance D= 1.0 m

Distance between slits d= 0.30 mm

Number of fringe = 9

Width = 1.6 cm

We need to calculate the angle

Using formula of angle

$\tan\theta=\dfrac{y}{D}$

$tan\theta=\dfrac{1.6\times10^{-2}}{1.0}$

$\theta=\tan^{-1}(\dfrac{1.6\times10^{-2}}{1.0})$

$\theta=0.91^{\circ}$

We need to calculate the wavelength of the light

Using formula of wavelength

$d\sin\theta=m\lambda$

$\lambda=\dfrac{d\sin\theta}{m}$

Put the value into the formula

$\lambda= \dfrac{0.30\times10^{-3}\times\sin0.91}{9}$

$\lambda=5.29\times10^{-7}\ m$

$\lambda=530\ nm$

Hence, The wavelength of the light is 530 nm.

5 0

3 years ago

Read 2 more answers

Which phrase best describes a metallic bond?

aalyn [17]

Metallic bonding<span> is the force of attraction between valence electrons and the metal ions. It is the sharing of many detached electrons between many positive ions,

Hopefully this can help you understand

</span>

6 0

4 years ago

Read 2 more answers

Atoms have no electric charge because they

Elanso [62]

Answer choice c is the correct choice

4 0

3 years ago

Three features describe the motion of an object. they are...

jasenka [17]

I would think B, Position, direction and speed. I tried looking it up and B seems to be the closest answer that resembles my results as I found that energy didn’t describe the motion of an object.

6 0

3 years ago

Read 2 more answers