help.....please science​

Answer:

A) La altura de la repisa sobre el punto donde se lanza la moneda es de aproximadamente 0,42 m

B) La velocidad de la moneda justo antes de que golpee el platillo es de aproximadamente 0,895 m/s hacia abajo

Explanation:

A) Los parámetros dados son;

La distancia horizontal del plato desde donde se lanza la moneda = 2,1 m

La velocidad con la que se lanza la moneda, u = 6,4 m / s

El ángulo al que se lanza la moneda, θ = 60 °

La componente horizontal de la velocidad, vₓ = 6.4 m / s × cos (60°) = 3.2 m/s

El tiempo que tarda la moneda en recorrer una distancia horizontal de 2,1 m, 't' se calcula de la siguiente manera;

t = 2,1 m/(3,2 m/s) = 0,65625 segundos

Por tanto, la altura de la moneda a 0,65625 segundos se da de la siguiente manera;

y = u × sin (θ) × t - (1/2) × g × t²

En t = 0,65625 segundos, obtenemos;

y = 6,4 × sin (60°) × 0,65625 - (1/2) × 9,81 × (0,65625) = 0,41840044589

La altura de la repisa sobre el punto donde se lanza la moneda, y ≈ 0.42 m

B) La velocidad vertical de la moneda justo antes de que golpee el platillo, [tex]v_y[/tex], se da como sigue;

[tex]v_y[/tex] = u × sin(θ) - g·t

∴ [tex]v_y[/tex] = 6.4 × sin(60°) - 9.81 × 0.65625 ≈ -0.895

La velocidad de la moneda justo antes de golpear el platillo, [tex]v_y[/tex] ≈ 0.895 m/s (hacia abajo)

Answer:

Pretty good

Explanation:

is there nxt 1

Answer:

a. 30%

Explanation:

Given the following data;

Energy as effort, Ee = 20 J

Energy as heat, Eh = 6 J

To find the percentage efficiency (P.E);

P.E = Eh/Ee * 100

Substituting into the formula, we have;

P.E = 6/20 * 100

P.E = 6 * 5

P.E = 30 %

Therefore, the percentage efficiency of the machine is 30 %.

Answer:

Media literacy creates a conscious awareness, the ability to understand, analyze, the messages various media like the newspapers, the radio, that is for the consumer, and it also promotes how best media create information for production.

While information literacy and technology literacy differs from other literacy asked in the question above, as information literacy and technology could be used when describing getting information through adequate research and further dishing out this available information so as to effectively use the information with the aim to solve problems, create awareness, or educate, through technologies such as for example, email.

Lastly, media and information literacy differ in terms of use from the other two explained above, as media and information literacy describes discerning information credibility, accuracy, and objectivity of sources they come from, and it shows people how important it is to have credible information to make informed judgments and the ethical use of the information they consume.

Answer:

C

Explanation:

Answer:

B

Explanation:

Because it’s asking about sexual

Answer:

17.32 J

Explanation:

Work = Fcos(theta)x

Work = (10cos30°)(2)

Work = 17.32 J

An unbalanced force acting on an object results in the object's motion changing. The object may change its speed (speed up or slow down), or it may change its direction. Friction is a force that resists the motion or the tendency toward motion between two objects in contact with each other.

motion

Answer:

motion. FILLER FILLER FILLER

Explanation:

1.Electromagnetic waves

2.Electromagnetic radiation

3.Electromagneticwaves

Answer:

b

Explanation:

In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit. In parallel circuits, each light has its own circuit, so all but one light could be burned out, and the last one will still function

Answer:

This law is used to find the luminosity (the rate of energy released), for an object given its surface temperature. This law assumes the body acts as a black-body radiator (an object that emits energy from the entire EM spectrum)

For a given object with a constant surface area, the Stefan-Boltzmann law says that luminosity is proportional to the temperature raised to the fourth power.

Explanation:

Answer:

https://www.khanacademy.org/science/physics/geometric-optics/lenses/v/convex-lenses

Explanation:

Here is a link to a video to tell you about this.

Question : 1

=》

[tex]k.e = \dfrac{1}{2}mv {}^{2} [/tex]

=》

[tex]k.e = \dfrac{1}{2} \times 1000 \times (5) {}^{2} [/tex]

=》

[tex]k.e = 500 \times 25[/tex]

=》

[tex]k.e = 12500 \: joules[/tex]

kinetic energy = 12500 joules

Question : 2

=》

[tex]k.e = \dfrac{1}{2} mv {}^{2} [/tex]

=》

[tex]k.e = \dfrac{1}{2} \times 10 \times ({5})^{2} [/tex]

=》

[tex]k.e = 5 \times 25[/tex]

=》

[tex]k.e = 125 \: joules[/tex]

kinetic energy = 125 joules

Question : 3

=》

[tex]k.e = \dfrac{1}{2} mv {}^{2} [/tex]

=》

[tex]k.e = \frac{1}{2} \times 100 \times (5) {}^{2} [/tex]

=》

[tex]k.e = 50 \times 25[/tex]

=》

[tex]k.e = 1250 \: joules[/tex]

kinetic energy = 1250 joules

Explanation:

he is very keen on taking up and is the age

Answer:

atomic mass

Explanation:

the identify of the atom is determined by the number of protons

you tend to push off with the foot still on the boat.

Newtons 3rd law of motion hold that every action has an equal and opposite reaction.

So, the amount of force you use on your back foot to push yourself onto the dock, has an equal end opposite amount of force going the other way from your sole of your foot, which pushes the boat the other way.

The same principle applies when you fire a cannon - in the pirate films, you see the body of the cannon forced back as it is fired.

Take it one step further, Henry VIII flagship, “Mary Rose fired all its cannons together one day in a broad side, the opposite force rolled the ship over and sank it.

Answer:

Mined materials are needed to construct roads and hospitals, to build automobiles and houses, to make computers and satellites, to generate electricity, and to provide the many other goods and services that consumers enjoy.

Explanation:

Answer:

T = 0.084 Nm

Explanation:

First, we will calculate the angular acceleration:

[tex]\alpha = \frac{\omega_f - \omega_i}{t}[/tex]

where,

α = angular acceleration = ?

ωf = final angular speed = (10 RPM)(2π rad/1 rev)(1 min/60 s) = 1.05 rad/s

ωi = initial angular speed = (2 RPM)(2π rad/1 rev)(1 min/60 s) = 0.21 rad/s

t = time = 5 s

Therefore,

[tex]\alpha = \frac{1.05\rad/s - 0.21\ rad/s}{5\ s}\\\\\alpha = 0.168\ rad/s^2[/tex]

Now, for the torque:

[tex]T = I\alpha[/tex]

where,

T = torque = ?

I = moment of inertia = 0.5 kg.m²

Therefore,

[tex]T = (0.5\ kg.m^2)(0.168\ rad/s^2)\\[/tex]

T = 0.084 Nm

Answer:

Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.Explanation:

Answer:

Action Reaction

Explanation:

Linear vectore F

Answer:

D. all the above

Explanation:

Took the quiz.

Answer:   D) all the above

Explanation:   :)

Answer:

They both involve wave interactions.

Explanation:

Diffraction is defined as the bending of waves around obstacles. Refraction can be defined as the bending of the light when it transfers from one substance to another. The main similarity between the diffraction and refraction is that both involves the interaction of the waves with the substance and also causes the waves to bend and change their direction. Hence, they both involve wave interaction is the correct option.

What diffraction and refraction have in common is that they both involve wave interactions. This is further explained below.

When waves travel from one medium to another and refract, This causes them to change direction. while Diffraction is simply defined as the bending of waves around barriers.

In conclusion, diffraction and refraction are properties of waves.

Read more about Wave

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Answer:

Magnification, m = 3

Explanation:

It is given that,

Focal length of the lens, f = 15 cm

Object distance, u = -10 cm

Lens formula :

v is image distance

Magnification,

So, the magnification of the lens is 3.

Answer:

31.1

Explanation:

Trust brother

Answer: The ratio of carnivorous species to all mammal species is 1:20

Explanation:

250:5000 = 250/250 = 1

250:5000 = 5000/250 = 20

Answer = 1:20

Answer:

5 N

Explanation:

To find the net force of 2 objects pushing against each other you subtract them and that’s how you get your answer.

The net force acting on a system is defined as the resultant of all the force acting on all the body. The value of net force will be 5N.

Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body. Force is defined as the product of mass and acceleration. Its unit is Newton.

The given data in the problem will be;

F₁ is the force act to the right = 10 N

F₂ is the force act to the left= 5N

F is the net force=?

According to the equilibrium concept, the net force acting on the body is equal to zero.

F = F₁  -  F₂

F = 10-5

F = 5N

Hence the value of net force will be 5N.

To learn more about the force refer to the link;

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La energía no se crea ni se destruye solo se transforma

Explanation:

espero y te ayude

Option B. The mechanical advantage of a handle on a water well that requires 5 newtons of force to lift a 40-Newton bucket of water is 8.

Mechanical advantage is a measure of the force amplification completed by means of the usage of a device, mechanical tool or gadget device. The device trades off input forces towards motion to gain a preferred amplification in the output pressure.

The version for this is the regulation of the lever. The mechanical advantage is the degree how which tons of force is increased with the aid of using a device or gadget. it is equal to the pressure exerted with the aid of the tool or system divided via the carried-out effort.

calculation:-

Mechanical advantage = load/effort

                                       = 40/5

                                       = 8

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