Calculate the electrical energy use of the microwave in 120 V circuit has 7.5 A current flow, if it used for 0.05 hours

Answer:

[tex]1.78\:\mathrm{m}[/tex]

Explanation:

Kinematics equations used:

[tex]v_f=v_i+at,\\\\\Delta y = v_it+\frac{1}{2}at^2,\\\\v_f^2=v_i^2+2a\Delta x[/tex]

Other equations used:

[tex]\Delta x =v_i\cdot t,\\\text{-basic trigonometry for right triangles},\\\text{-application of physics concepts}[/tex]

By finding the horizontal component of the projectile's initial launch, we can find how long it will take for the projectile to reach the hill.

Since the projectile is launched at 12 m/s 30 degrees above the horizontal, we can use basic trig for a right triangle to find the horizontal component of the launch:

[tex]\cos 30^{\circ}=\frac{x}{12},\\x=12\cos 30^{\circ}\approx 10.3923048454\:\text{m/s}[/tex]

Now we can use [tex]\Delta x =v_x\cdot t[/tex] to find the time it will take to reach the hill:

[tex]7.5=10.3923048454\cdot t,\\t=\frac{7.5}{10.3923048454}\approx 0.72168783648\:\text{s}[/tex]

To find the total flight time the projectile would take if it were to land back to the same height it started out with, we can use the following kinematics equation:

[tex]v_f=v_i+at[/tex]

We'll use basic trig for a right triangle again to find the vertical component of the velocity at launch:

[tex]\sin 30^{\circ}=\frac{y}{12},\\y=12\sin 30^{\circ}=6\:\text{m/s}[/tex]. (recall [tex]\sin 30^{\circ}=\frac{1}{2}[/tex])

Now plugging this value in:

*Note: the projectile will hit the ground with a vertical velocity equal in magnitude but opposite in direction than the projectile's initial vertical velocity at launch

[tex]-6=6+(-9.8\cdot t),\\t=\frac{-12}{-9.8},\\t=1.22448979592\:\text{s}[/tex]

^This is the total flight time the projectile would take if it were to land back to the same height it started with. Since acceleration is constant, we can divide this time by two to find the time it would take to reach maximum height.

[tex]1.22448979592\div 2=0.61224489795\:\text{s}[/tex]

Thus, it will take [tex]0.61224489795\:\text{s}[/tex] to reach maximum height, meaning that it will take [tex]0.72168783648 - 0.61224489795=0.10944293853\:\text{s}[/tex] to land on the hill after reaching maximum height. Now that we've found this, we can use the following kinematics equation to find the vertical displacement from the projectile's max height to the hill:

[tex]\Delta y =v_it+\frac{1}{2}at^2[/tex]

At maximum height, the projectile's vertical velocity will be zero. Therefore, [tex]v_i=0[/tex] and we have:

[tex]\Delta y =\frac{1}{2}at^2[/tex]

Plugging in values , we have:

[tex]\Delta y =\frac{1}{2}\cdot 9.8\cdot 0.10944293853^2=0.05869100829\:\text{m}[/tex]

This means that the hill is [tex]0.05869100829\:\text{m}[/tex] lower than the max. height the object will reach.

To find the height of the hill from the ground, we will use the following kinematics equation:

[tex]v_f^2=v_i^2+2a\Delta x,\\-6^2=0+2\cdot-9.8\cdot\Delta x,\\36=-19.6\Delta x,\\\Delta x =\frac{36}{-19.6},\\\Delta x =-1.83673469388\:\text{m}[/tex]

Therefore, the max. height that the object will reach is [tex]1.83673469388\:\text{meters}[/tex].

Thus, the hill's height is [tex]1.83673469388-0.05869100829=1.77804368559\:\text{m}\approx\boxed{1.78\:\mathrm{m}}[/tex].

Answer:

η = 2.2

Explanation:

The index of refraction is given by the following formula:

[tex]\eta = \frac{Sin\ \theta_i}{Sin\ \theta r}[/tex]

where,

η = index of refraction of cubic zirconia = ?

[tex]\theta_i[/tex] = angle of incidence = 56°

[tex]\theta_r[/tex] = angle of refraction = 22°

Therefore,

[tex]\eta = \frac{Sin\ 56^o}{Sin\ 22^o}\\\\\eta = \frac{0.829}{0.375}[/tex]

η = 2.2

Answer:

It is 3 m/s² downward.

Explanation:

The mass of an object, m = 30 kg

Upward force, F = 200 N

Downward force, F' = -300 N

We need to find the magnitude and direction of its acceleration.

Net force = F+F'

= 200+(-300)

= -100 N

We know that,

Force, F = ma, a is acceleration of the object

[tex]a=\dfrac{F}{m}\\\\a=\dfrac{-100}{30}\\\\a=-3.33\ m/s^2\approx -3\ m/s^2[/tex]

Hence, the acceleration is -3 m/s² and it is acting in the downward direction.

Answer:

greater than

Explanation:

A bowling ball is bigger than a golf ball and greater than means bigger.

Answer:

transferred from one object to another. Charged objects can exert forces on other charged ... Electric charge can be measured using the law for the forces between charges

The electric force exerted by the +2 C on another +2 C when at a distance of 25 m is 5.76×10⁷ N

F = Kq₁q₂ / r²

Where

F = Kq₁q₂ / r²

F = (9×10⁹ × 2 × 2) / (25)²

F = 36×10⁹ / 625

F = 5.76×10⁷ N

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Answer:

barometer

Explanation:

Answer:

barometer

Explanation:

Answer:hereeee for pointssss only

Explanation:

The acceleration of gravity on Ganymede will be [tex]g=0.35\ \frac{m}{s^2}[/tex]

It is given that for a simple pendulum on Ganymede

Lenth= 1.00 m

the time period  T= 10.5 sec

The formula for a time period of simple pendulum will be

[tex]T=2\pi\sqrt{\dfrac{l}{g} }[/tex]

By rearranging the formula

[tex]g=l\times (\dfrac{2\pi}{T} )^2[/tex]

[tex]g=1\times (\dfrac{2\pi}{10.5} )^2=0.3577\frac{m}{s^2}[/tex]

[tex]g=0.3577\ \frac{m}{s^2}[/tex]

Thus the acceleration of gravity on Ganymede will be [tex]g=0.35\ \frac{m}{s^2}[/tex]

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The correct option is: "none of these statements is true".

To find out the correct option among all the options, we need to know more about the electron and proton.

Thus, we can conclude that the option (e) is correct.

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Answer:

The force that must be applied to maintain a constant velocity is equal o the friction force which is 2,650 N

The total force required from rest is (2,650·t + 20,972.[tex]\overline 2[/tex])/t N

Explanation:

The given data of the car in motion are;

The mass of the car, m = 1,510 kg

The force of friction from the road, [tex]F_f[/tex] = 2,650 N

When the car is moving at 50.0 km/hr, we have;

v = 50.0 km/hr = 250/9 m/s ≈ 13.88889 m/s

According to Newton's first Law of motion, a body will continue in a state of rest or in uniform motion along a straight line unless acted on by a force

The force acting on the car in motion = 2,650 N

When the car is moving at a constant velocity, the forces acting on the  car are in equilibrium and the net force is zero

Therefore;

The magnitude of the force that will keep the car moving at a constant velocity = The friction force of the road = 2,650 N

The direction of the force = In the direction of motion of the car

Where the time it takes the car to accelerate from rest to 50.0 km/hr = t seconds, we have;

The force required to move at a constant speed = 1,510 kg × (250/9 m/s - 0)/t s = 20,972.[tex]\overline 2[/tex]/t N

The total force required to move forward with a constant velocity of 50.0 km/hr becomes 20,972.[tex]\overline 2[/tex]/t N + 2,650 N = (2,650·t + 20,972.[tex]\overline 2[/tex])/t N

Where;

t = The time it takes the car to reach 50.0 km/hr from rest.

Answer:

N = 198.3 N,  fr = 126.98 N and    μ = 0.64

Explanation:

For this exercise we must use the translational equilibrium condition.

Let's set a reference system with the x-axis horizontally and the y-axis vertical. Let's use trigonometry to decompose the applied force

      cos θ = Fₓ / F

      sin θ = F_y / F

      Fₓ = F cos θ

      F_y = F sin θ

      Fₓ = 159 cos 37 = 126.98 N

      F_y = 159 sin 37 = 95.69 N

Y axis  

    N + F_y - W = 0

    N = W - F_y

    N = 294 - 95.69

    N = 198.3 N

X axis

    Fₓ -fr = 0

     Fₓ = fr

     fr = 126.98 N

the expression for the friction force is

       fr = μ N

       μ = fr / N

       μ = 126.98 / 198.3

       μ = 0.64

Answer:

Given that refractive index of the material is √2. i.e. n = √2. Hence, critical angle for the material is 45°

Answer:

This is because it is derived from newtons and metres as shown in the expression;

Explanation:

[tex]pressure = \frac{force}{area} \\ P= \frac{F}{A} \\ P= \frac{newtons}{ {m}^{2} } \\ = pascals[/tex]

Answer:

Unit of pascal is called derived unit because it involves three fundamental units i.e.meter,kg,and second.

Explanation:

formula of pascal=kg/m/s^2

Answer:

5N towards north

Explanation:

Answer:

I think the answer is B

hope this helps

have a good day :)

Explanation:

Answer:

C. The student should make a concave lens model because it directs light away from the center of the lens

Explanation:

The student should make a concave lens model because it directs light away from the center of the lens.

A lens that has at least one inward-curving surface is said to be concave. Since it is a divergent lens, light rays that have been bent by it are dispersed. Short-sightedness is treated by concave lenses, which are thinner in the center than the borders (myopia).

The earliest known usage of a corrective lens is mentioned in Pliny the Elder's writings (23–79). Pliny claims that Emperor Nero used an emerald, perhaps concave formed to adjust for myopia, to watch gladiatorial matches.

After passing through the lens, light beams appear to originate from a spot known as the primary focus.

Therefore, The student should make a concave lens model because it directs light away from the center of the lens.

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Answer:

Explanation:

a. the sound energy is converted into electrical signals using diaphragm present in the microphone and these signals then reach to the speakers and then convert- ed back to sound. The electrical current generated by a micro- phone is very small and referred to as MIC-level; this signal is typically measured in millivolts.

b. Thermodynamics

Answer:

30.6 degrees

Explanation:

A light wave travels through water (n = 1.33) at an angle of 35°. It will have angle of 30.56° when it passes from the water into the glass (n = 1.5).

When a light is going from medium 1 to medium 2. The refractive index is defined as a ratio of velocity of light in medium 1 to velocity of light in medium 2. Refractive index is the factor which deals with the amount of bending of light. More refractive index means more it will bend in the medium 2. When it is 1 we can say that light has not been bent.

By Snell's law, Refractive index is given by,

sin (i) ÷ sin (r) = μ₂÷μ₁

where i is the the angle of incidence

r is the angle of refraction

μ₂ & μ₁ are refractive index of medium 2 and 1 resp.

Given,

Refractive index of water μ₁ = 1.33

Refractive index of Glass μ₂ = 1.5]

Angle of incidence i = 35°

Angle of refraction r = ?

Light is going from water to glass, hence by snell's law.

sin (i) ÷ sin (r) = μ₂÷μ₁

sin (35°) ÷ sin (r) = 1.5 ÷ 1.33

0.5735 ÷ sin (r) = 1.12781

sin (r)  = 0.5735 ÷ 1.12781

r = 30.56°

Hence it passes from the water into the glass at angle of 30.56°.

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[tex]ke = \frac{1}{2} m {v}^{2} [/tex]

[tex]44 = \frac{m {4}^{2} }{2} \\ \frac{88}{16} = m \\ 5.5 = m[/tex]

Answer:

The parallel plate capacitor is the simplest form of capacitor. ... The property of a capacitor to store charge on its plates in the form of an electrostatic field is called the Capacitance of the capacitor. Not only that, but capacitance is also the property of a capacitor which resists the change of voltage across it.

Explanation:

credits :- adultsscience

Explanation:

Capacitance exists wherever conductive material is separated by insulating material. 

Capacitive structures have the ability to store energy as an electric field;

when a capacitive structure has been designed as an electrical component that has a specified amount of capacitance, it is called a capacitor.

Capacitance symbol is C

you can get a meter for Capacitance

Capacitance formula is C = ε(A/d) where ε represents the absolute permittivity of the dielectric material being used.

simple piece of wire has very low capacitance

Answer: • Fewer teens admitted to drinking and driving in 2013 than in 2004.

• In 2013, about one in five teens admitted to riding with a driver who had been drinking.

Explanation:

The conclusions about alcohol and teen driving that are supported by the data provided will be:

• Fewer teens admitted to drinking and driving in 2013 than in 2004.

• In 2013, about one in five teens admitted to riding with a driver who had been drinking.

Other options are incorrect as the conclusion wasn't gotten from the data that was orovufed

Answer:

Fewer teens admitted to drinking and driving in 2013 than in 2004.

In 2013, about one in five teens admitted to riding with a driver who had been drinking.

Explanation:

Answer:

do we have to choose 2 answers here?

Answer:

most probably it's C

Explanation:

alveoli is surrounded by capillaries and whit that option small intestines is also there

Answer:

Gravity.

Rocket ships.

Ball.

Basketball.

Explanation:

Gravity has to do a lot with air. It puts the planets in there area.

Rocket Ship has to do a lot with air. If i'm right, they calculate the area, weather, about the air.

A ball gets throwed in the air, which gravity comes into place.

Basketball is also a similar example to a ball.

Answer:

Earth's tilt causes the sun's rays to hit unevenly

Explanation:

The Earth orbit or rotate in it's axis or orbital plane. When it's rotate, it tilt from the sun rays Earth's tilt causes the sun's rays to hit the Earth unevenly Earth's axis is tilted about 23 degrees, which causes a variation or differences in the sun's latitude.causing it to vary by 23 degrees north of the equator at the start of northern summer to 23 degrees south of the equator at the start of northern winter. On Earth, that tilt is the primary reason for different seasons.

Answer:

Solution given:

any three applications of electromagnetic waves are:

2.

Solution given;

power [P]=100W

Current [I]=5A.

Voltage [V]=?

we have

P=IV

100=5*V

V=[tex] \frac{100}{5} [/tex]=20V

the voltage of the battery used in the car is 20V.

Answer:

Explanation:

1. Electromagnetic waves are used to broadcast radio and TV signals. It is also used for wireless charging cell phones. Cell phone itself uses electromagnetic waves for its cell signal.

See attached drawing for ray diagram.

2. Given: the power of a bulb of car is 100 W and 5A current flows through the filament of the bulb.

Power of a bulb is given by voltage * current.

So 100W = voltage * 5A

Voltage = 100/5 = 20V

Answer:

Horizontal component = 60.05 m/s

vertical component = 22.96 m/s

Explanation:

cosine(angle) = adjacent / hypotenuse or  horizontal / angled velocity

angled velocity * cosine (angle) = horizontal velocity

65 m/s * cosine(22.5) = 60.05 m/s

sine(angle) = adjacent/ hypotenuse or vertical/ angled velocity

angled velocity * sine (angle) = vertical velocity

65m/s sine(22.5) = 22.96 m/s

Explanation:

Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula r=P/C, where P is the amount of useful output ("product") produced per the amount C ("cost") of resources consumed.

i dont know what the answer really is but this is what i think

Answer:

i think its 470

Explanation:

Answer:Potential Energy

Explanation:

Given

The ball is 4 ft above the ground

The ball is possessing Potential energy, which is relative energy and depends upon the reference frame. The potential energy with respect to the ground is the product of mass, acceleration due to gravity, and distance of the ball from the ground.

Answer:

6.67

Explanation: