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Zielflug [23.3K]

3 years ago

11

2. Sara y Antonio son mellizos. Cuando nacieron, Sara pesaba 600 gramos más que Antonio. Sus pesos ya se han igualado, gracias a

que Antonio come muchísimo. Sabiendo que al nacer Antonio pesaba 2,25 kilogramos, ¿cuánto pesaba Sara al nacer? ayuda es para hoy

1 answer:

valkas [14]3 years ago

7 0

Answer:

8,25 creo

Explanation:

nose no estoy segura

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The ground state energy of an electron in a one-dimensional trap with zero potential energy in the interior and infinite potenti

ElenaW [278]

Answer:

0.5 eV

Explanation:

$E_1$ = Initial potential energy = $2\ eV$

$E_2$ = Final potential energy

$L_1$ = Initial width

$L_2$ = Final width = $2L_1$

Energy of an electron in a one-dimensional trap is given by

$E=\dfrac{n^2h^2}{8mL^2}$

From the equation we get

$E\propto \dfrac{1}{L^2}$

So,

$\dfrac{E_1}{E_2}=\dfrac{L_2^2}{L_1^2}\\\Rightarrow E_2=\dfrac{E_1L_1^2}{L_2^2}\\\Rightarrow E_2=\dfrac{2L_1^2}{4L_1^2}\\\Rightarrow E_2=0.5\ eV$

The ground state energy will be 0.5 eV

6 0

3 years ago

How is an image formed by a plane mirror

masha68 [24]

Is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come.

8 0

2 years ago

A student lefts a bouncy ball to 1.2m, then releases the ball. The ball bounces back up to 0.86m. Construct an explanation as to

Airida [17]

Answer:

the decrease in energy is due to a transformational in internal energy of the body in the rebound.

Explanation:

For this exercise we can calculate the initial and final mechanical energy

Em₀ = U = m g y₁

$Em_{f}$ = U = m g y₂

we look for the variation of the energy

ΔEm = Em_{f} - Em₀

ΔEm = m g (y_{f} -y₀)

ΔEm = m g (0.86 -1.2)

ΔEm = -3.332 m

We can see that there is a decrease in mechanical energy, this is transformed into internal energy of the ball during the impact with the ground, this energy can be formed by several factors such as a part of the friction with the surface, an increase in body temperature or a deformation of the body; there may be a contribution from several of these factors.

In conclusion the decrease in energy is due to a transformational in internal energy of the body in the rebound.

7 0

3 years ago

Read 2 more answers

When the angle of incidence equals the angle of reflection it is called the law of

Reptile [31]

The law of reflection

6 0

2 years ago

Read 2 more answers

Point charges q1= - 4.30 nC and q2=+ 4.30 nC are separated by a distance of 3.00 mm, forming an electric dipole.

sammy [17]

Answer:

a) p = 25.8 10⁻¹² C m , b) The direction of the dipole moment is directed from the negative to the positive charge, c) E = 4.65 10² N/C

Explanation:

a) The dipole moment is

p = 2qa

p = 2 4.30 10⁻⁹ 3.00 10⁻³

p = 25.8 10⁻¹² C m

b) The direction of the dipole moment is directed from the negative to the positive charge, that is, in the opposite direction to the electric field.

c) The torque is

τ = p x E

τ = p E sin θ

E = τ / p sin θ

E = 7.20 10⁻⁹ /(25.8 10⁻¹² sin 36.9)

E = 4.65 10² N/C

We calculate

τ = 15.49 10⁻¹² 4.7 10²

τ = 7.28 10⁻⁹ N m

4 0

3 years ago