Can someone please answer this, ill give you brainliest Would be very appreciated.

Answer:

0.0025 sec

Explanation:

Period = 1 / frequency = 1/400 = 0.0025 sec

Answer:

r = 15 ohms    for a single bulb

1 / R = 1 / r  + 1 / r + 1 / r + 1 / r

R = r / 4 = 15 / 4 = 3.75 ohms       total resistance

part II

If bulbs are in series R = 5 * 15 ohm = 75 ohm total resistance

P = I V = V / R * V = V^2 / R

P = 115^2 / 75 = 176 watts

part III

If the bulbs are in parallel then      

R = 15 / 5 =  3 ohms for the circuit

I = 115 / 3 = 38.3 amps for circuit

P = 115^2 / 3 = 4400 watts

Check: P = I V = 38.3 * 115 = 4400 watts

Answer:

I think its O A. True.

Answer:

I think is cookoo because i learn it from web

Explanation:

I found it in web so yea

Answer:

1.4 red : 0 white

Explanation:

Answer: A

Explanation:

The three resistances are connected in series, their equivalent is equal to the addition of all the resistances. The unknown value of resistance is 1.74 ohm.

The resistance is the opposition offered to the flow of current.

Given the value of resistance R₁ is 1 ohm, R₂ is 68 ohm and R₃ is R.

The total current flowing through the battery of voltage 24 V is 0.20 Amperes.

From the ohms law, The equivalent resistance is

[tex]R_{eq}[/tex] = Voltage / Current

The equivalent resistance is

[tex]R_{eq}[/tex] = R₁+ R₂+R₃

24 / 0.20 = 1+68+R

R = 1.74 ohm

The unknown value of resistance is 1.74 ohm.

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The magnitude of the change in momentum of the driver is 3900kgm/s.

Hence option D) 3900 kg • meters per second is the correct answer.

Momentum is simply the product of the mass of an object and its velocity.

Its is expressed as;

P = m × v

Where m is the mass of the object and v is its velocity.

Given the data in the question;

We substitute the given values into the expression above to determine the initial momentum of the driver before he was brought to rest.

P initial = m × v

P initial = 125kg × 31m/s

P initial = 3875 kgm/s ≈ 3900kgm/s

Now, as the driver is brought to rest, final velocity becomes zero

P final = 125kg × 0

P final = 0

This means that the change in momentum of the driver is his initial momentum which is 3900kgm/s.

Therefore, the magnitude of the change in momentum of the driver is 3900kgm/s.

Hence option D) 3900 kg • meters per second is the correct answer.

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Answer:

D for edge

Explanation:

GO GO GO TRUST ME

The lower limit that could be used to determine the position of each object along the direction of the velocity is 1.136 x 10⁻³ m.

The uncertainty in the position of the electron is calculated as follows;

[tex]\Delta x = \frac{h}{4\pi m\Delta v}[/tex]

where;

[tex]\Delta x = \frac{6.63 \times 10^{-34} }{4\pi \times 9.11 \times 10^{-31} \times 0.051} \\\\\Delta x = 1.136 \times 10^{-3} \ m[/tex]

Thus, the lower limit that could be used to determine the position of each object along the direction of the velocity is 1.136 x 10⁻³ m.

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Answer:

At the topmost point where the velocity has only horizontal component whereas the acceleration is vertical.

Explanation:

There is only a horizontal component of velocity at the ap3x of the projectile, and acceleration is vertically downwards owing to gravitation, therefore velocity and acceleration are perpendicular to one another.

The value of maximum voltage, when the capacitor can withstand a peak voltage of 670 v is 47.6 volts.

Resonance frequency is the natural frequency of an particle or object. At this frequency, the object tries to vibrate at higher amplitude. It can be calculated with the following formula:

[tex]f=\dfrac{1}{2\pi LC}[/tex]

Here, L is the induction and C is the capacitance.

Let for an L-R-C circuit, the value of resistance is 400 ohm, induction is 0.380 Haney and capacitance is 1.20×10⁻² μF.

Put the values in above formula,

[tex]f=\dfrac{1}{2\pi(0.380)(1.20\times10^{-8})}\\f=2356.8\rm\; Hz[/tex]

The capacitor can withstand a peak voltage of 670 v. Use the following formula to find the value of current as,

[tex]I=2\pi fC\times Vc\\I=2\pi (2356.8)(1.20\times10^{-8})\times 670\\I=0.119\rm\; A[/tex]

The value of resistance is 400 ohms. Thus, the voltage is,

[tex]V=IR\\V=(0.119)(400)\\V=47.6\rm\; V[/tex]

Thus, the value of maximum voltage, when the capacitor can withstand a peak voltage of 670 v is 47.6 volts.

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As altitude increases, air pressure decreases. hence option C is correct.

It is pressure exerted by the weight of the atmosphere at sea level. its value is 101,325 Pascal which we call it as 1 atmospheric pressure expressed as 1 atm. i.e. 1 atm = 101,325 N/m².

Like water has pressure when we go long inside the water, our atmosphere has also pressure from top to surface of the earth.

There are different layers of atmosphere from bottom to top which are Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.

Each layer has its own range and weight.

When we are on the surface of the earth, all layers of atmosphere will apply pressure. but when we increase altitude(height), the number layers reduces and its weight too.

Hence as altitude increases, air pressure decreases.

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Answer:

False

Explanation:

Middle of crest to middle of NEXT CREST is wavelength

Answer:

the answer is equal to the microwave gamma rays visible light x-rays.

if air is blown with a speed of 15 m/sec across the top of one side of a u-tube containing water, the difference between the water levels on the two sides is 1.3 cm.

The density is the ratio of the mass and volume of the particular object or liquid.

Applying the Bernoulli's equation across the ends of the tube A and B, we have

[tex]P_{A} = P_{B} - \dfrac{1}{2} \rho Av^{2}[/tex]

Substituting ρ = 1.2 , v = 15 and [tex]P_{B }=P_{0 }[/tex]

[tex]P_{A}= P_{B} -135[/tex]

In the left limb, [tex]P_{A}= P_{C}[/tex]

In the right limb, [tex]P_{D}= P_{o} + \rho g h[/tex]

The pressure at C and D are same.

[tex]P_{D}= P_{C}[/tex]

Substituting from the above equations , we have,

h = -1.3 cm

The height to the left limb is greater.

The difference between the water levels on the two sides is 1.3 cm.

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Answer:

to be turned into glycogen not wasted

Explanation:

Since the body has a lot of energy left it will turn that energy into glycogen which is a storage form of glucose which will when neccassary will be converted into glucose from the horomone glucagon and be given to the body to be used as energy so the energy is never wasted

The conclusion v₁=v₂ can not be made. Let u=(1,1,1),v₁=(2,3,-5),v₂=(4,-1,-3). The dot product of u.v₁=uv₂ is satisfied,but v₁≠v₂.The correct answer is c.

The dot product, also known as the scalar product, is an algebraic operation that yields a single integer from two equal-length sequences of numbers.

The dot product of two vectors' Cartesian coordinates is commonly used in Euclidean geometry.

Because there may be more than the 1 vectors satisfying the expression.

[tex]\rm uv_1 = 1 \times 2 +1 \times 3 +1 \times(-5)=0[/tex]

[tex]\rm uv_2= 4-1-3 =0[/tex]

The v₁ is not found equal to the v₂.

The conclusion v₁=v₂ can not be made. Let u=(1,1,1),v₁=(2,3,-5),v₂=(4,-1,-3). The dot product of u.v₁=uv₂ is satisfied,but v₁≠v₂.The correct answer is c.

Hence, the correct answer is c.

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The resistance of the 1000 W microwave oven that gets plugged into a 110 v outlet will be 10 ohms.

Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.

The given data in the problem is;

P is the power= 1000 W

V is the voltage= 110 V

I is the current

R is the resistance

The resistance is found by the formula;

[tex]\rm P = \frac{V^2}{R} \\\\ \rm R = \frac{V^2}{P} \\\\ R = \frac{(100)^2}{10000} \\\\ R= 10\ ohm[/tex]

Hence, the resistance value will be 10 ohms.

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Answer:

15 kg

Explanation:

KE = 1/2 * m * v²   ⇒  m = (2*KE) / v²

m = (2*480) / 8²

m=15 kg

Answer:

-322.64 J

Explanation:

75 N  * cos 125     *    7.5   =  -322.64 J

Answer:

Aristotle was blind, therefore could not see change in positions. Aristotle could see no detectable change in the positions of the stars, thought Earth was immovable.

Explanation:

Answer:

Microphone

Explanation:

Microphone is the device which converts sound into electrical energy by electromagnetic induction

Answer:

Voltage, electric potential difference, electric pressure or electric tension is the difference in electric potential between two points, which is defined as the work needed per unit of charge to move a test charge between the two points.

Answer:

Option C

Explanation:

The question is maya most likely trying to answer is, how does the thickness of the wire affect the strength of an electromagnet?

From the experimental set-up by maya, we can determine the effect of thickness of wire on strength of electromagnet.

R ∝ 1/A

where;

As the thickness of the wire increases, the area of the wire increases and the resistance of the wire will decrease. As the resistance of the wire decreases, the current flowing in the wire increases as well.

Thus, the increase in the thickness of a wires increases, the strength of an electromagnet.

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Answer:

A

Explanation:

The energy of the electromagnetic spectrum is not used in mass spectrography to make measurements.

In physics and chemistry, mass spectrometry refers to statistical analytical techniques that allow scientists to determine the mass distribution of various types of molecules based on their mass on a substance.

The energy of the electromagnetic spectrum is not used in mass spectrography to make measurements. The process of mass spectrometry is primarily based on the interaction of molecules with a beam of electrons (rather than photons) and the subsequent measurement.

Hence the energy of the electromagnetic spectrum is not used in mass spectrography to make measurements.

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Answer:

Both waves are mechanical waves

Comets that come from the Oort cloud have orbits that decay over time, bringing them closer to the sun each year. Option A is correct.

Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ice.

They range from a few miles to tens of miles wide, but as they orbit closer to the Sun, they heat up and spew gases and dust into a glowing head that can be larger than a plane.

Comets that come from the Oort cloud have orbits that decay over time, bringing them closer to the sun each year.

Hence,option A is correct.

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Answer:

B) have random tilts and orbits, sharing little with each other

Explanation:

Hope this helps, have a great rest of your day/ restful night!

Let's see

For series connection

[tex]\\ \rm\Rrightarrow R_{eq}=R_1+R_2+R_3\dots[/tex]

For parallel connection

[tex]\\ \rm\Rrightarrow \dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}\dots[/tex]

Answer:

V=w/q V= 1.2/0.4* 10 ^-3 V = 3 * 10 ^ 3 V = 3000 v

if its not correct let me know so I can figure it out

The ideal mechanical advantage will be 8.017. The ideal mechanical advantage value may be grater than the actual value of mechanical advantage.

Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtained efficiency of  forces in levers and pulley.

The ideal mechanical advantage is found as;

[tex]\rm IMA = \frac{d \pi}{l} \\\\ \rm IMA = \frac{0.812 \times \pi}{0.318} \\\\ IMA=8.017[/tex]

The ideal mechanical advantage will be 8.017.

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