Indicar tipo de unión química que presentan los siguientes compuestos. Realizar a representación de Lewis, molecular o iónica, según corresponda: a-CH4 b-SrO c-HBr d-NH3 e-Cl2O f-Li2O g-CO2 h-MgCl2

Answer:

vB = 15.4 m/s

Explanation:

Principle of conservation of energy:

Because there is no friction the mechanical energy is conserve

ΔE = 0

ΔE : mechanical energy change (J)

K : Kinetic energy (J)

U: Potential energy (J)

K = (1/2)mv²

U = m*g*h

Where :

m: mass (kg)

v : speed (m/s)

h : hight (m)

Ef - Ei = 0

(K+U)final - (K+U)initial =0

(K+U)final = (K+U)initial

((1/2)mv²+m*g*h)final = ((1/2)mv²+m*g*h)initial , We divided by m both sides of the equation:

((1/2)vB² + g*hB = (1/2 )vA²+ g*hA

(1/2) (vB)² + (9.8)*(14.7) =  0 + (9.8)(26.8 )

(1/2) (vB)² = (9.8)(26.8 ) - (9.8)*(14.7)

(vB)² = (2)(9.8)(26.8 - 14.7)

(vB)² = 237.16

vB = 15.4 m/s : speed of the cart at B

Answer:

the guy above me is correct

Explanation:

The electromagnetic waves with an energy of are likely X-rays.

The energy of an electromagnetic wave is related to its frequency and wavelength by the equation:

E = hf = hc/λ

where:

E = energy of the electromagnetic wave

h = Planck's constant ()

f = frequency of the electromagnetic wave

c = speed of light ()

λ = wavelength of the electromagnetic wave

Solving for λ:

λ = hc/E =

λ ≈

This corresponds to a wavelength of about 44 nanometers, which falls in the range of X-rays. Therefore, the electromagnetic waves with an energy of are likely X-rays.

for such more question on electromagnetic Wave

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Final answer:

The capacitance of the four capacitors, ranked from highest to lowest, is B = C (they both have equal capacitance), followed by D, and then A.

Explanation:

The capacitance of a parallel-plate capacitor is given by C = εA/d, where ε is the permittivity of the dielectric material (which is equal to the product of the vacuum permittivity and the relative permittivity or dielectric constant k), A is the area of one of the plates, and d is the separation between the plates.

Applying this formula to the four capacitors and simplifying:

1. Capacitor A: Cap = k(0.5L)^2/d = 0.25kL^2/d
2. Capacitor B: Cap = 4k(L)^2/(0.5d) = 8kL^2/d
3. Capacitor C: Cap = 2k(2L)^2/d = 8kL^2/d
4. Capacitor D: Cap = 2k(L)^2/(2d) = kL^2/d

When ranked from highest to lowest capacitance, the order will be B = C > D > A.

Learn more about Capacitance here:

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Answer: Option (C) is the correct answer.

Explanation:

Work is defined as the energy required when force is applied in a certain direction.

The expression for work, force and distance is as follows.

                        W = F × d

where,      W = work

                 F = force

                 d = distance

It is given that force applied to drag the box is 22 N and distance is 16 meters. Therefore, calculate work done as follows.

                        W = F × d

                            = 22 N × 16 meters

                            = 352 Nm               (1 Newton meter = 1 joule)

or,                   W = 352 J

Thus, we can conclude that amount of work done is 352 J.

Answer:

The mass of the Al-duckie should be 30 kg.

Explanation:

We will use the first law of thermodynamics:

ΔU = m·Cv·ΔT

Since the specific heat of water is 4.185 J(gºC), the change in the water's internal energy would be:

ΔU = 100 kg · 4.185 J(gºC) · (42ºC - 38ºC) = 1674 KJ

Given that no heat is lost, all the internal energy that the water loses while cooling down will transfer to the duckie.  So, if the duckie has ΔU = 1674 KJ and its final temperature is the desired 38 ºC, we can calculate its mass using the first law again: