All categories

3 years ago

The main reason for making the cover of a vacuum

Physics

1 answer:

prohojiy [21]3 years ago

7 0

Answer:

(A) conduction

Explanation:

parts of that are touching other parts and thus create heat!!!! dont lose that heat!

You might be interested in

Green light (λ = 518 nm) strikes a single slit at normal incidence. What width slit will produce a central maximum that is 3.00

MariettaO [177]

Answer:

6.9066 × 10⁻⁵ m

Explanation:

For constructive interference, the expression is:

$d\times sin\theta=m\times \lambda$

Where, m = 1, 2, .....

d is the distance between the slits.

The formula can be written as:

$sin\theta=\frac {\lambda}{d}\times m$ ....1

The location of the bright fringe is determined by :

$y=L\times tan\theta$

Where, L is the distance between the slit and the screen.

For small angle , $sin\theta=tan\theta$

So,

Formula becomes:

$y=L\times sin\theta$

Using 1, we get:

$y=L\times \frac {\lambda}{d}\times m$

Thus, the distance between the central maximum is 3.00 cm

First bright fringe , m = 1 occur at 3.00 / 2 = 1.50 cm

Since,

1 cm = 0.01 m

y = 0.0150 m

Given L = 2.00 m

λ = 518 nm

Since, 1 nm = 10⁻⁹ m

So,

λ = 518 × 10⁻⁹ m

Applying the formula as:

$0.0150\ m=2.00\ m\times \frac {518\times 10^{-9}\ m}{d}\times 1$

<u>⇒ d, distance between the slits = 6.9066 × 10⁻⁵ m</u>

7 0

3 years ago

What is the energy in the spark produced by discharging the second capacitor? 1. The same as the discharge spark of the first ca

Nastasia [14]

Complete Question

The two isolated parallel plate capacitors be- low, one with plate separation d and the other with D > d, have the same plate area A and

are given the same charge Q.

What is the energy in the spark produced by discharging the second capacitor?

1. The same as the discharge spark of the first capacitor

2. More energetic than the discharge spark of the first capacitor

3. Less energetic than the discharge spark of the first capacitor

Answer:

The correct option is 2

Explanation:

The formula for the energy stored in the capacitor is

$U = \frac{Q^2}{2C}$

And generally the formula for finding the capacitance of a capacitor is

$C = \frac{\epsilon_oA}{d}$

We can denote the capacitance of the first capacitor as $C_1 = \frac{\epsilon_oA}{d}$

and denote the capacitance of the second capacitor as $C_2 = \frac{\epsilon_oA}{D}$

Looking at this formula we can see that C varies inversely with d

as D > d it means that $C_1 > C_2$

Since the charge is constant

$U\ \alpha\ \frac{1}{C}$ i.e U varies inversely with C

So $C_1 > C_2$ => $U_2 >U_1$

This means that the energy of spark would be more for capacitor two compared to capacitor one

The correct option is 2

6 0

4 years ago

The wavelength of sound wave is 30 m. Frequency is 7 Hz. What is the wave speed

MaRussiya [10]

Answer:23hz

Explanation:

6 0

3 years ago

The kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s is j. (formula: )

andreyandreev [35.5K]

1/2 m V-squared = j. j = 25 joules.

3 0

3 years ago

Read 2 more answers

A cylindrical can is partially filled with water. The radius of the cylindrical can is 8 inches, and its height is 9 inches. If

VashaNatasha [74]

The volume of the cylindrical can is given by:

V = πr²h

V = volume, r = base radius, h = height

Differentiate both sides of the equation with respect to time t. The radius r doesn't change over time, so we treat it as a constant:

dV/dt = πr²(dh/dt)

Given values:

dV/dt = -527in³/min

r = 8in

Plug in and solve for dh/dt:

-527 = π(8)²(dh/dt)

dh/dt = -2.62in/min

The height of the water is decreasing at a rate of 2.62in/min

7 0

3 years ago