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2 years ago

Question 4 of 10

Physics

2 answers:

Mars2501 [29]2 years ago

8 0

Answer:

The answer is C.Cables transmit infrared waves over longer distances.

Explanation:

I took AP EX quiz.

avanturin [10]2 years ago

5 0

Answer:

C. Cables transmit infrared waves over longer distances.

Explanation:

A.pex

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The turntable in a microwave oven has a moment of inertia of 0.039 kg⋅m2 and is rotating once every 4.4 s . Part A What is its k

gayaneshka [121]

To solve this problem it is necessary to apply the concepts related to Kinetic Energy, specifically, since it is a body with angular movement, the kinetic rotational energy. Recall that kinetic energy is defined as the work necessary to accelerate a body of a given mass from rest to the indicated speed.

Mathematically it can be expressed as,

$KE = \frac{1}{2} I\omega^2$

Where

I = Moment of Inertia

$\omega =$ Angular velocity

Our values are given as

$I = 0.039kg\cdot m^2$

A revolution is made every 4.4 seconds.

$\theta = 1 rev \rightarrow 4.4s$

$\Rightarrow \omega = \frac{1rev}{4.4s}$

If the angular velocity is equivalent to the displacement over the time it takes to perform it then

$\omega = 0.2272rev/s(\frac{2\pi rad}{1rev})$

$\omega = 1.42rad/s$

Replacing at our previous equation we have,

$KE = \frac{1}{2} I\omega^2$

$KE = \frac{1}{2} (0.039)(1.42)^2$

$KE = 0.03993J$

Therefore the kinetic energy is equal to $3.9*10^{-2}J$

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3 years ago

Dry air will break down if the electric field exceeds about 3.0×106v/m. part a what amount of charge can be placed on a capacito

Genrish500 [490]

The solution for this problem is:The charge would be now equal to:(electric constant) multiplied by the (field strength) multiplied by the (area) so plugging in our values, will give us:8.85 * 10^-12 As / (V * m) * 3 * 10^6 V/m * 0.055 m^2 = 1.46 e-6 amperes would be the answer

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3 years ago

A small bar of pure gold whose density is 19.3g/cm. Displaces 80 cm

nasty-shy [4]

Answer:

The mass of the gold bar is 1,544 g

Explanation:

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3 years ago

A twin-sized air mattress used for camping has dimensions of 100 cm by 194 cm by 14 cm when blown up. The weight of the mattress

Paul [167]

Answer:

$2625.156\ \text{N}$

Explanation:

Dimensions of mattress 100 cm by 194 cm by 14 cm

$m_m$ = Mass of mattress = 4 kg

$\rho$ = Density of water = $1000\ \text{kg/m}^3$

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

Volume of mattress

$V=100\times 194\times 14=271600\ \text{cm}^3=0.2716\ \text{m}^3$

Weight of water displaced is equal to the buoyant force

Mass of water

$m=\rho V\\\Rightarrow m=1000\times 0.2716\\\Rightarrow m=271.6\ \text{kg}$

Mass of person would be

$m_p=m-m_m=271.6-4\\\Rightarrow m_p=267.6\ \text{kg}$

Weight of the person would be

$w=m_pg\\\Rightarrow w=267.6\times 9.81\\\Rightarrow w=2625.156\ \text{N}$

The air mattress could hold a person that weighs up to $2625.156\ \text{N}$ .

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2 years ago

The speed of the proton when it reaches point

romanna [79]

1) An electron is moving east in a uniform electric field of 1.53N/C directed to the west. At point A, the velocity of the electron is 4.51�105m/s pointed toward the east. What is the speed of the electron when it reaches point B, which is a distance of 0.400m east of point A? 2) A proton is moving in the uniform electric field of part A. At point A, the velocity

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3 years ago