Which of the following variables are conserved?

A resistor, an inductor, and a switch are all connected in series to an ideal battery of constant terminal voltage. What does th

Irina-Kira [14]

Answer:

The time constant τ = L/R represent the time requiered for the curent to get value of 63 % of its maximun value

Explanation:

In a circuit RL ( serie circuit with a resistor R and the inductor L ) when a voltage is applied the inductor will have a reaction, such reaction consist in the creation of an electromotive force which will prevent the current to get its maximun value. The time constant which in the case of an inductor is

τ = L/R , represent the time requiered for the crrent to be 63 % of its final value

4 0

4 years ago

The uncertainty in position of a proton confined to the nucleus of an atom is roughly the diameter of the nucleus. If this diame

irakobra [83]

<u>Answer:</u> The uncertainty in proton's momentum is $1.3\times 10^{-20}kg.m/s$

<u>Explanation:</u>

The equation representing Heisenberg's uncertainty principle follows:

$\Delta x.\Delta p\geq \frac{h}{2\pi}$

where,

$\Delta x$ = uncertainty in position = d = $7.8\times 10^{-15}m$

$\Delta p$ = uncertainty in momentum = ?

h = Planck's constant = $6.627\times 10^{-34}kgm^2/s^2$

Putting values in above equation, we get:

$\Delta p=\frac{6.627\times 10^{-34}kgm^2/s^2}{2\times 3.14\times 7.8\times 10^{-15}m}\\\\\Delta p=1.3\times 10^{-20}kg.m/s$

Hence, the uncertainty in proton's momentum is $1.3\times 10^{-20}kg.m/s$

5 0

3 years ago

Molybdenum has the BCC crystal structure, has a density of 10.22 g cm-3 and an atomic mass of 95.94 g mol-1. What is the atomic

puteri [66]

Answer:

atomic concentration = 2 atoms/unit cell

lattice parameter: a= 3.22 x 10⁻¹⁰ m

atomic radius: r= 1.39 x 10⁻¹⁰m

Explanation:

The atomic concentration is the number of atoms that can fit into a unit cell. It is a known number for each unit cell crystal structure. For a BCC (body-centered cube) crystal structure, atomic concentration is 2 atoms/unit cell because there are a 1/8 part of an atom in each corner of the cube (1/8 x 8= 1 atom) and 1 central atom in the central position of the cube ⇒ n= 1 atom + 1 atom= 2 atoms/unit cell

In order to calculate the lattice parameter a, we introduce the atomic mass 95.94 g/mol and the density 10.22 g/cm³ in the expression for the volume of the cube:

Vc= a³= $\frac{(95.94 g/mol) x (2 atoms/unit cell)}{(10.2 g/cm^{3}) x (6.023 x 10^{23} atoms/mol) }$

a³= 3.12 x 10⁻²³ m³

⇒ a = ∛(3.12 x 10⁻²³ m³) = 3.22 x 10⁻¹⁰m

Once we know the lattice parameter a, we can calculate the atomic radius r by using the expression of a for a BCC structure:

a= $\frac{4r}{\sqrt{3}}$

⇒ r= a x √3/4= (3.22 x 10⁻¹⁰ m) x √3/4 = 1.39 x 10⁻¹⁰ m

5 0

3 years ago

Which type of fitness is not based on performance?

Aneli [31]

Fitness can be measured during the actual performance.
Which means that there are a lot of factors that can affect agility, speed, and coordination beside the physical factors itself. Meanwhile, flexibility solely depends on the physical Factors.

The answer is flexibility .

Hope this helps (:

4 0

3 years ago

Write about any 8 areas of field where physics is applied. illustrate with examples.

Ulleksa [173]

1. In construction. When constructing roads, building

2. In Engineering, when engineering we use physics such as calculations.

3. At home

4. In industries, industries use chemicals and so on.

5. In tailoring, we use the knowledge of physics like when sowing.

6. In carpentry, we use calculations.

7. In Hospitals, we use physics we balancing

8. In Sites, we use energy.

4 0

3 years ago