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3 years ago

HURRY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Physics

2 answers:

Alekssandra [29.7K]3 years ago

6 0

A wedge uses mechanical advantage to reduce the amount of force needed.

ladessa [460]3 years ago

3 0

A, it's more about the force with leverage.

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A plant worker accidentally breathes some stored gaseous tritium, a beta emitter with maximum particle energy of 0.0186 MeV. The

andrey2020 [161]

Answer:

400 milli-rems

Solution:

As per the question;

Maximum energy of particle, $E_{m} = 0.0186\ MeV$

Weight, w = 1 kg

Energy absorbed, E = $4\times 10^{- 3}\ J$

Now,

Equivalent dose is given by:

$D_{eq} = \frac{E}{w} =\frac{4\times 10^{- 3}}{1} = 4\times 10^{- 3}\ J/kg$

1 Gy = 1 J/kg

Also,

1 Gy = $1\times 10^{5}\ milli-rems$

Therefore,

Dose equivalent in milli-rems is given by:

$D_{eq} = 4\times 10^{- 3}\times 1\times 10^{5} = 400\ milli-rems$

8 0

2 years ago

A thin, uniform rod is hinged at its midpoint. to begin with, one-half of the rod is bent upward and is perpendicular to the oth

bazaltina [42]

Answer: initial I = (m/2)LÂ˛/3 + (m/2)LÂ˛ where L = Â˝ the length of the rod, and the vertical half can be treated as a point mass. initial I = mLÂ˛(1/6 + 1/2) = 2mLÂ˛/3 final I = m(2L)Â˛/3 = 4mLÂ˛/3 Since I has doubled and momentum is conserved, Ď‰ has halved. Ď‰ = 3.9 rad/s. Formulaically: 2mLÂ˛/3 * 7.8rad/s = 4mLÂ˛/3 * Ď‰

5 0

3 years ago

How does quantum theory explain the emission spectra of atoms?

ankoles [38]

The correct answer is B.

Let us think of the classical theory first. In the classical theory, light is a wave that gives energy. This energy gradually helps the electron jump to a higher energy level.
In quantum theory, this is wrong; an electron cannot absorb a small amout of energy because there is not close enough state to jump to with that energy; only very specific amounts of energy lead to a change in orbital levels/ absorbance of energy. Also, each pair of energy levels has a specific energy difference that is needed from an electron so that it can move.
Hence, B is correct; all other sentences describe classical models of light-electron interactions

4 0

3 years ago

Read 2 more answers

A Cambra pouce car traveling at 28 m/s slow

natka813 [3]

Answer:

t = 7.8 seconds

Explanation:

Given that,

The initial speed of the car, u = 28 m/s

Acceleration of the car, a = 3.6 m/s²

We need to find the time taken for the police car to come to Stop. When it stops, its final speed is equal to 0. So, using the equation of kinematics to find it i.e.

$v=u+at\\\\0=28+3.6t\\\\t=\dfrac{28}{3.6}\\\\t=7.8\ s$

So, the required time is 7.8 seconds.

7 0

2 years ago

I need to know the solution and the formula.

scoray [572]

Statement:

A non-deformed spring is 15 cm long. When a 2.0 N force is applied to it, its length becomes 19 cm.

To find out:

The spring constant of the spring.

Solution:

Force (F) = 2 N

Extension of the spring (x)
= (19 - 15) cm
= 4 cm
= 0.04 m [since we have to find the answer in N/m]

Let the spring constant of the spring be k.

We know, the formula of spring force, i.e.,
F = kx

Putting the values in the above formula, we get
2 N = k × 0.04 m
or, k = 2 N ÷ 0.04 m
or, k = 50 N/m

Answer:

The spring constant of this spring is 50 N/m.

Hope you could understand.

If you have any query, feel free to ask.

7 0

2 years ago