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Tju [1.3M]
3 years ago
7

Do the conduction electrons in a copper wire act quantum mechanically or not? Roughly speaking, quantum mechanics comes in when

the de Broglie wavelength of an electron is comparable to or longer than the spacing between atoms. The lattice constant (roughly the spacing between atoms in a crystal) for copper is about 4 x 10-10 m. The drift velocity of electrons is typically less than 102 m/s under household conditions (b) What about atoms in the interstellar medium? Here we want to compare the average spacing between atoms (they move!) to the de Broglie wavelength of an atom. The interstellar medium is mostly hydrogen at an average density of order 1/cm3 and temperature about 3 K. In this case you' need the thermody- namic resul p/(2m)(3/2)kT, where k is Boltzmann's constant (c) Now let's switch gears to talk abou the Uncertainty Principle When LIGO detects gravitational waves, it is measuring displacements of its test masses of order 10-18 m. The test masses are about 40 kg. What is the minimum uncertainty induced in the velocities of the test masses?
Physics
1 answer:
Ksju [112]3 years ago
6 0

Answer:

I know the answer

Explanation:

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Help me answer these, please. I GIVE CROWNS!! PLEASE!!
bija089 [108]

Answer: 1- A diagram showing the forces acting on the object.

2- The force vector describes a specific amount of force and its direction. You need both value and direction to have a vector.

3- A vector quantity has a direction and a magnitude, while a scalar has only a magnitude. You can tell if a quantity is a vector by whether or not it has a direction associated with it.

4- I don’t know

5- When two forces acting on an object are equal in size but act in opposite directions, we say that they are balanced forces

6- By applying an unbalanced force, you can change the motion of an object. Unbalanced forces can make an object at rest start moving, make a moving object stop, or change the direction and speed of the object.

7- If the forces on an object are unbalanced, this is what happens: a stationary object starts to move in the direction of the resultant force.

8- Imbalance or unequal force

9- The result is no motion. Balanced forces can cancel each other out. Any time there is a balanced force, the object does not move.

10- net force is the vector sum of all the forces that act upon an object.

RESTATE THESE

Explanation:

RESTATE!!!!

8 0
3 years ago
Read 2 more answers
Help! 20 points of a test!
mamaluj [8]

Answer:

t=6

Explanation:

Multiply to remove the variable from the denominator.

4 0
2 years ago
Read 2 more answers
A block of mass 11.0 kg slides from rest down a frictionless 38.0° incline and is stopped by a strong spring with
ivanzaharov [21]

Answer:

11.72 mm

Explanation:

The gravitational potential energy equals the potential energy of the spring hence

PE_{gravitational}=PE_{spring}

mgh=0.5kx^{2} where m is the mass of object, g is the acceleration due to gravity, h is the height, k is the spring constant and x is the extension of the spring

mgdsin\theta=0.5kx^{2} where \theta is the angle of inclination and d is the sliding distance

Making x the subject then

x=\sqrt {\frac {2mgdsin\theta}{k}}

Substituting the given values then

x=\sqrt{\frac {2\times 11\times 9.81\times 3\times sin 38}{2.9\times 10^{4}}}= 0.117240716\approx 11.72 mm

8 0
3 years ago
A football player runs at 8m/s and plows into a 80kg referee standing on the field causing the referee to fly forward at 5m/s. I
madreJ [45]

The topic here is momentum.

When a collision is said to be elastic, it means that the colliding objects now travel at their own new, indivual and distinct velocities, often in different directions.

So we write that as,

(mass of football player x velocity of football player) + (mass of referee x velocity of referee) = (mass of football player x velocity of football player) + (mass of referee x velocity of referee)

(M × 8) + (80 × 0) = (M× 0) + (80 × 5)

8M = 400

M = 50 kg

4 0
3 years ago
You are going to invent a new device that people can use instead of a microwave oven to warm up leftovers. Which type of electro
kicyunya [14]
If y<span>ou are going to invent a new device that people can use instead of a microwave oven to warm up leftovers, the type of electromagnetic wave that would be most useful to investigate would probably be infrared waves, because these kinds of waves are associated with heat. </span>
7 0
3 years ago
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