The critical angle for diamond (n-2.42) surrounded by air is approximately 24 35 48 66

Collisions between atoms are often elastic, but sometimes inelastic collisions occur, and the lost kinetic energy can become int

Galina-37 [17]

Answer:

a) E = 6.4 1019 J b) v = 0.69 10⁴4 m / s

Explication

a) convert E = 4.0 eV

1 eV = 1.6 10⁻¹⁹ J

E = 4.0 eV (1.6 10⁻¹⁹ J / 1 eV)

E = 6.4 10⁻¹⁹ J

b) Suppose we have a frontal shock and all the kinetic energy of oxygen is transferred to Cs

Ei = K = ½ m v²

Ef = 6.4 10⁻¹⁹ J

½ m v² = 6.4 10⁻¹⁹

The oxygen mass of the periodic table is

PA = 15,999 u

1u = 1.660 10⁻²⁷ kg

Pa = 15,999 1,660 10⁻²⁷ kg

m= Pa = 26,558 10⁻²⁷ kg

Let's calculate the speed

v2 = 2 / m 6.4 10⁻¹⁹

v2 = 2 / 26,558 10⁻²⁷ 6.4 10⁻¹⁹ =

v = √0.4819 10⁸

v = 0.69 10⁴4 m / s

4 0

4 years ago

John throws a rock down with speed 14 m/s from the top of a 30 m tower. If air resistance is negligible, what is the rock's spee

astra-53 [7]

The final velocity of the rock before it touches the ground is 28 m/s.

Answer:

Explanation:

As the rock is thrown down, this means the acceleration due to gravity will be exerting on the rock. So the rock will be exhibiting a free fall motion. Thus, the acceleration of the rock will be equal to the magnitude of acceleration due to gravity. Then using the third equation of motion, we can determine the final velocity of the rock provided the values for initial velocity, displacement and acceleration is given in the problem itself.

So the acceleration is equal to 9.8 m/s² due to its free fall motion and displacement will be equal to the height of the tower which is given as 30 m. And the initial speed of the rock is stated as 14 m/s. The initial speed is represented as u, final speed is represented as v, displacement is represented as s and acceleration is represented as a.

$2as=v^{2}-u^{2}$

Then, 2 × 9.8 × 30 = v²-(14)²

v²=784

v= 28 m/s

So the final velocity of the rock before it touches the ground is 28 m/s.

8 0

4 years ago

Quick Quiz 40.2 While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: y

Firlakuza [10]

The order of decreasing photon energy is FM radio, AM radio, yellow light, and microwaves.

Electromagnetic radiation: The electromagnetic field's waves, which are conveying electromagnetic radiant energy through space, are what make up electromagnetic radiation. It consists of X-rays, gamma rays, microwaves, infrared, light, and radio waves. These waves are all a component of the electromagnetic spectrum.

Microwave radiation has wavelengths between one meter and one millimeter, which correspond to frequencies between 300 MHz and 300 GHz, respectively.

Radio waves: The electromagnetic spectrum's longest wavelengths, which are found in radio waves, are normally found at frequencies of 300 gigahertz and below.

The radio waves have the highest photon energy and the lowest is microwaves.

So, the highest to lowest order is FM radio, AM radio, yellow light and microwaves.

Learn more about waves here:

brainly.com/question/1968356

#SPJ4

4 0

2 years ago

The disk rotates about a fixed axis through point O with a clockwise angular velocity ω0 = 16 rad/s and a counterclockwise angul

Lapatulllka [165]

Answer:

V = 4.48m/s a = 1.57m/s²

Explanation:

ω₀ = 16rad/s

α₀ = 5.6rad/s²

r = 280mm = 0.28m

a = ?

v = ?

Angular velocity (ω₀) = velocity of acceleration / length of path

ω₀ = v / r

V = ω₀ * r

V = 16 * 0.28

V = 4.48m/s

Acceleration = ?

Angular acceleration α₀ = angular velocity (ω) / time take (t)

α₀ = ω / t .... equation i

But acceleration (a) = velocity (v) / time (t)

a = v / t

t = v / a

Put t = v / a into equation i

α₀ = ω / (v / a)

α₀ = ω * a / v

α * v = ω * a

a = (α * v) / ω

a = (5.6 * 4.48) / 16

a = 1.568m/s²

a = 1.57m/s²

3 0

3 years ago

10.20) Perform the following conversions: (a) 0.912 atm to torr,(b) 0.685 bar to kilopascals, (c) 655 mm Hg to atmospheres,(d) 1

masha68 [24]

Answer:

(a) 693.12 torr

(b) 68.5 kilopascals

(c) 0.862 atmosphere

(d) 1.306 atmospheres

(e) 36.74 psi

Explanation:

(a) 0.912 atm = 0.912 atm × 760 torr/1 atm = 693.12 torr

(b) 0.685 bar = 0.685 bar × 100 kPa/1 bar = 68.5 kPa

(c) 655 mmHg = 655 mmHg × 1 atm/760 mmHg = 0.862 atm

(d) 1.323×10^5 Pa = 1.323×10^5 Pa × 1 atm/1.01325×10^5 Pa = 1.306 atm

(e) 2.50 atm = 2.50 atm × 14.696 psi/1 atm = 36.74 psi

5 0

4 years ago

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