Consider a one-dimensional crystal (similar to a carbon nanowire) with length 10 um and lattice spacing 0.1 nm.

RequireD:
a. What is the Fermi level assuming one electron per atom?
b. What is the density of states as a function of electron energy?

Answer:

250,000 Joules

Explanation:

The work required is the amount of energy added, so the answer is the difference in kinetic energy before and after the acceleration of the car.  (The problem doesn't say it's flat where the car is, but well assume it since there is no information about an elevation change that would require us to concern ourselves with potential energy!)

W = E_final - E_initial

= 1/2 m v_final^2 - 1/2 m v_initial^2

= 1/2 m (v_final^2 - v_initial^2)

= 1/2 (1000 kg) ( (30 m/s)^2 - (20 m/s^2) )

= 1/2 (1000 kg) (500 m^2/s^2)

= 250,000 kg m^2/s^2

= 250,000 Joules

Seems like some of your question is missin

Explanation:

Answer:

0.00

Explanation:

A rocket moves upward as the engine pushes downward against exhaust gases and the exhaust gases push upward against the engine.

Answer:

Explanation:

The density of a substance is defined as the mass per unit volume of the substance, the unit is in kg/m^3 and it is represented by the greek letter rho

Step one:

given data

we are told that the density  of Co2=  1.98 kg/m3

and the mass of Co2 is= 1.70 kg

we know the relation between mass, volume and density is

[tex]density=mass/volume[/tex]

make volume subject of formula we have

[tex]volume=mass/density[/tex]

substitute we have

[tex]volume=1.7/1.98\\\\volume= 0.85m^3[/tex]

Answer:

I think the answer should be an object's tendency to resist changes in motion.

Explanation:

Inertia is resistance of any physical object to any changes in its velocity.

Answer:

an object's tendency to resist changes in motion.

Explanation:

Answer:

720 m

Explanation:

Taking the upward direction as positive

We are given:

Initial vertical velocity of the cannonball = 120 m/s

Vertical acceleration of the cannonball = -10 m/s²

Final velocity of the Cannonball = 0 m/s [at the maximum height, the velocity of the ball will be 0 m/s for a moment]

Maximum height of the ball:

v² - u² = 2as                                 [Third equation of motion]

replacing the variables (s is the maximum height)

(0)² - (120)² = 2(-10)(s)

-14400 = -20s

s = -14400 / -20                           [Dividing both sides by -20]

s = 720 m

Hence, the maximum height of the Cannonball fired vertically at a velocity of 120 m/s is 720 m

Answer:

It has to be 32g

Explanation:

Mass at the beginning of the reaction is 32g

To ensure the law of conservation of mass, the mass at the beginning and end of the reaction must be the same.

 The law of conservation of mass states that "matter is neither created nor destroyed but atoms combines with one another" .

Answer:

1.2 x [tex]10^4[/tex] N

Explanation:

The centripetal force of a body moving in a circle is given by:

Centripetal force = [tex]\frac{Mv^2}{r}[/tex]

where M = mass of the object, v = velocity with which the object is moving, and r = radius of the circle.

In this case, M = 25,000 kg, v = 2.0 m/s, and r = 8.2 m. Hence;

Centripetal force generated by the whale = 25,000 x 2^2/8.2

                                            = 12,195.12 N = 1.2 x [tex]10^4[/tex] N to two significant digits.

Answer:

b

Explanation:

Answer:

Abstinence is the best choice to prevent the consequences of sexual activity because you're putting yourself at lower risk to encounter STD's and STI's. Abstinence also prevents you from getting pregnant.

Explanation:

I got 100% on Edge.

Complete abstinence is the best choice to prevent the consequences of sexual activity because this prevents any type of sexual contact and STDs.

Abstinence is a self-enforced restraint from the indulging in bodily activities which are widely experienced as giving pleasure to people. Most frequently, abstinence refers to sexual abstinence, however it can also mean abstinence from alcohol, drugs, food, etc.

Complete abstinence is the only way which can guarantee protection against the infection with sexually transmitted diseases. This means avoiding all the types of intimate genital contact. Someone who is practicing complete abstinence does not have any type of intimate sexual contact. So, there is no risk of getting an STD.

Learn more about Sexual activity here:

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Answer:

cook some hamburgers and go fishing

Explanation:

Answer:

go to the baseball game and have fun

Explanation:

Answer:

p_{f} = 6 m / s

Explanation:

We can solve this exercise using conservation of momentum. For this we define a system formed by the two balls, so that the forces during the collision have been intense and the moment is preserved

Initial instant. Before the crash

        p₀ = m v +0

Final moment. Right after the crash

        [tex]p_{f}[/tex] = (m + m) v_{f}

how the moment is preserved

        p₀ = p_{f}

       m v = 2 m v_{f}

       v_{f} = v / 2

we calculate

       v_{f} = 12/2

       p_{f} = 6 m / s

Answer: 0kg(m/s)

Explanation:

Answer:

it the last one

Explanation:

Answer:

2 sig

Explanation:

1 and 7

Answer:

D) it constantly reverses direction

Explanation:

Just took the test

Answer:

0.41s

8.01m/s

Explanation:

Using the formula; v = u + at

Where;

u = initial velocity (m/s)

v = final velocity (m/s)

t = time (s)

a = acceleration (m/s²)

According to the provided information, u = 4m/s, s = 8m,

V = u + at

4 = 0 + 9.8t

4 = 9.8t

t = 0.41s

b) v = u + at

v = 4 + 9.8(0.41)

v = 4 + 4.018

v = 8.018m/s

Solution :

Distance between the Earth and the moon, D = [tex]$3.84 \times 10^8 \ m$[/tex]

Radius of the earth, r = [tex]$6.37 \times 10^6 \ m$[/tex]

Gravitational force on the near side of the moon, [tex]$F_N = \frac{GM_m m}{(D-r)^2}$[/tex]    ......(1)

Gravitational force on the far side of the moon, [tex]$F_F = \frac{GM_m m}{(D+r)^2}$[/tex] ..............(2)

where, [tex]$M_m$[/tex] = mass of moon

            m = mass of the near side and far side respectively (both are taken as equal)

Therefore,

[tex]$\frac{F_N-F_F}{F_N}\times 100 = \frac{\frac{GM_m m}{D-r}^2-\frac{GM_m m}{D+r}^2}{\frac{GM_m m}{D-r}^2} \times 100 $[/tex]

                        [tex]$=1 - \frac{(D-r)^2}{(D+r)^2} \times 100$[/tex]

                       [tex]$=1- \left(\frac{1-\frac{r}{D}}{1+\frac{r}{D}}\right)^2 \times 100$[/tex]

                       [tex]$= 1- \left(\frac{0.98}{1.02}\right)^2 \times 100$[/tex]

                       = 7%

Hence, correct option is (b) About 7% greater

Answer: 16

Explanation:

Answer:

In a collision, there is a collision force which endures for some amount of time to cause an impulse. This impulse acts upon the object to change its velocity and thus its momentum

Sandra can take to lower her body fat percentage to eat several, balanced, low-calorie meals throughout the day and to exercise regularly.

When we can't access food for a lengthy period of time, fat is a vital source of stored energy.

There are several steps Sandra can take to lower her body fat percentage:

Exercise regularly: Regular physical activity, such as cardiovascular exercise, resistance training, and high-intensity interval training (HIIT), can help increase muscle mass and reduce body fat.

Eat a healthy diet: Eating a balanced diet that includes plenty of fruits, vegetables, whole grains, lean proteins, and healthy fats can help Sandra maintain a calorie deficit, which is necessary for reducing body fat. Avoiding processed foods, added sugars, and excessive amounts of saturated and trans fats can also be beneficial.

Control portions: Paying attention to portion sizes can help Sandra avoid overeating and maintain a calorie deficit. She can also use tools like measuring cups and a food scale to help control portion sizes.

Stay hydrated: Drinking enough water can help Sandra maintain a healthy metabolism and reduce feelings of hunger.

Get enough sleep: Getting adequate sleep (7-9 hours per night) can help regulate hormones that impact metabolism and hunger, making it easier to maintain a calorie deficit and reduce body fat.

Learn more about body fats here:

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Answer:

The particles that make up the pan will speed up

Explanation:

Answer:

Ancestors!

Explanation:

I know a thing or two~

Answer:

It depends on what the context is, if you mean people that came long before us you might be refering to ancestors, but if you mean people that came before us at any time then you would be refering to a predecessor.

Explanation:

Answer:

4th of August is the

Explanation:

5th and then I can help out by getting

Answer:

The final speed of the electron is 6,497 km/s

Explanation:

Given;

mass of the electron, m = 9.11 x 10⁻³¹ kg

electron potential, V = -120 V

Apply work energy theorem;

¹/₂mv² = eV

Where;

v is the final speed of the electron

e is the charge of the electron, = 1.602 x 10⁻¹⁹ C

[tex]v = \sqrt{\frac{2eV}{m} }\\\\v = \sqrt{\frac{2(1.602*10^{-19})(120)}{9.11*10^{-31}} }\\\\v = 6496473.75 \ m/s\\\\v = 6,497 \ km/s[/tex]

Therefore, the final speed of the electron is 6,497 km/s

Answer:

Work done, W = 18 kJ

Explanation:

Given that,

The mass of a refrigerator, m = 300 kg

The second floor of a house is 6 m above the street level.

We need to find the work required to lift the refrigerator to the second-story level.

Work done, W = F × d

Putting all the values,

W = 300 × 10 × 6

W = 18000 J

or

W = 18 kJ

So, 18 kJ of work is done in lifting the refrigerator to the second-story level.