Select all the correct answers.

IN nuclear in oder to slow down fast neutron the target material should contain

stealth61 [152]

Answer:

it depends if it is alpha ,beta or gamma

Explanation:

if alpha use paper

if beta use some clothing or aluminium

if it is gamma use lead

8 0

2 years ago

You throw a rock straight up from the edge of a cliff. It leaves your hand at time t = 0 moving at 13.0 m/s. Air resistance can

Zarrin [17]

Answer:

0.36s, 2.3s

Explanation:

Let gravitational acceleration g = 9.81 m/s2. And let the throwing point as the ground 0 for the upward motion. The equation of motion for the rock leaving your hand can be written as the following:

$s = v_0t + gt^2/2$

where s = 4 m is the position at 4m above your hand. $v_0 = 13 m/s$ is the initial speed of the rock when it leaves your hand. g = -9.81m/s2 is the deceleration because it's in the downward direction. And t it the time(s) it take to get to 4m, which we are looking for

$4 = 13t - 9.81t^2/2$

$4.905 t^2 - 13t + 4 = 0$

$t= \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$

$t= \frac{13\pm \sqrt{(-13)^2 - 4*(4.905)*(4)}}{2*(4.905)}$

$t= \frac{13\pm9.51}{9.81}$

t = 2.3 or t = 0.36

7 0

4 years ago

Read 2 more answers

A brief explanation of the properties of electron spin including, but not limited to, the pairing of electrons. (30 points)

Zarrin [17]

<u>Explanation of the properties of electron spin:</u>

Electron spin:

Electron spin is a quantum characteristic of electrons. It is a mode of angular momentum. The magnitude of this angular momentum is perpetual. If the electron spins clockwise on its axis, it is described as spin-up; counterclockwise is spin-down.

Electron spin has representative s

The electron spin quantum number has representative ms.

Electron pair:

Electron pair is also known as lewis pair. Lewis pair consists of two electrons that fill the same molecular orbital but have opposing spins. Gilbert N. Lewis introduced the electron pair idea in a 1916 article.

7 0

4 years ago

Fig. 28-9 shows the cross-section of a hollow cylinder of inner radius a = 5 cm and outer radius b = 7 cm. A uniform current den

Dmitrij [34]

Answer:

1.507×10⁻⁴ T

Explanation:

a = 5 cm = 0.05 m

b = 7 cm = 0.07 m

j = 1 A/cm²

Distance from magnetic field = d = 10 cm = 0.1 m

μ₀ = Vacuum permeability = 4π×10⁻⁷ H/m

Magnetic of hollow cylinder

$\oint B.ds=\mu_0 I\\\Rightarrow B2\pi d=\mu_0 I\\\Rightarrow B2\pi d=\mu_0J\pi(b^2-a^2)\\\Rightarrow B=\frac{\mu_0J\pi(b^2-a^2)}{2\pi d}\\\Rightarrow B=\frac{4\pi\times 10^{-7}\times 1\times 10^{-4}\pi(0.07^2-0.05^2)}{2\pi 0.1}\\\Rightarrow B=1.507\times 10^{-4}\ T$

∴ Magnitude of the magnetic field at a distance d = 10 cm from the axis of the cylinder is 1.507×10⁻⁴ T

7 0

4 years ago

What type of lever is shown below?

mr_godi [17]

Answer:

This is a third class lever.

Explanation:

A third class lever is when the fulcrum is on one of the far ends, the load is on the other, and the effort is pushing up from the middle.

8 0

4 years ago