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Answer:

Look below.

Explanation:

1.) The resistance of a light bulb filament is effected by both length and cross-sectional area. Thicker wires have less resistance. A 120-Watt bulb has a greater current and a smaller resistance. Thus, a 120-Watt bulb must have a thicker filament than a 60-Watt bulb (assuming the lengths of the filaments are identical). We also think of lightbulbs in terms of their power ratings in watts. Let us compare a 25-W bulb with a 60-W bulb. Since both operate on the same voltage, the 60-W bulb must draw more current to have a greater power rating. Thus the 60-W bulb’s resistance must be lower than that of a 25-W bulb. If we increase voltage, we also increase power. For example, when a 25-W bulb that is designed to operate on 120 V is connected to 240 V, it briefly glows very brightly and then burns out. Precisely how are voltage, current, and resistance related to electric power?

2.) Energy transferred = 120 × 2 = 240 J. This equation can be rearranged to V = E ÷ Q. So voltage is energy transferred divided by charge.

3.) Power= Voltage × Current

4.) W=Pt

Answer:

its light traveled through space for 1 billion years to reach us

Explanation:

For a lunar eclipse to occur, the Sun, Earth, and Moon must be roughly aligned in a line. Otherwise, the Earth cannot cast a shadow on the Moon's surface and an eclipse cannot take place. When the Sun, Earth, and Moon come together in a straight line, a total lunar eclipse takes

Answer:

E = h f      and since f = c / λ     we have E = h c / λ

Thus  λ = h c / E

Also, 1 ev = 1.6E-19 C

λ = 6.63E-34 * 3.0E8 / (1.6 * 1.6E-19)

λ = 6.63 * 3.0 / (1.6 * 1.6) * E-7

λ = 7.77E-7 = 777 nanometers

(B) is correct

The energy transformation that is happening in this process is mechanical energy to chemical energy.

According to conservation of energy, energy can not be distroyed and cannot be created, but can only be transformed from one form to another.

The batteries of some flashlights can be charged by turning a handle. The energy transformation that is happening in this process is mechanical energy to chemical energy. The chemical energy will transform to electrical energy which will eventually transform to light energy.

The turning of the handle is mechanical and the energy in battery is chemical.

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answer is 36

because the formulae of momentum is

mass×velocity

Since the rod is held perpendicular to the direction of motion of the spaceship, the rod is 1.00 m long to an Earth observer.

To answer the question, we use the principle of length contraction in relativity.

The principle of length contraction states that the length of an object would only contraction when it is in the direction of motion.

So, since the 1.00 m long rod is in the spaceship is held perpendicular to the direction of motion of the spaceship, there is no length contraction and thus, an observer on the Earth measures the same length of 1.00 m.

So, Since the rod is held perpendicular to the direction of motion of the spaceship, the rod is 1.00 m long to an Earth observer.

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Answer:

What is the difference between a prominence and a solar flare? A prominence is a loop of cool incandescent gas that extends above the photosphere. A solar flare is an explosive release of energy that comes from the sun and causes magnetic ditrubances.

Explanation:

(a) The final angular velocity of the flywheel after 3 complete revolutions is 4.96 rad/s.

(b) The time taken for the flywheel to make 3 complete revolutions is 5.93 s.

The final angular velocity of the flywheel after 3 complete revolutions is determined by applying third kinematic equation as shown below;

θ = 2π (rad/rev) x (3 rev) = 18.85 rad

ωf² = ωi² + 2αθ

ωf² = (1.4)² + 2(0.6)(18.85)

ωf² = 24.58

ωf = √24.58

ωf = 4.96 rad/s

The time taken for the flywheel to make 3 complete revolutions is calculated as follows;

ωf = ωi + αt

t = (ωf  - ωi)/α

t = (4.96 - 1.4)/0.6

t = 5.93 s

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Power developed by a model rocket engine will be 73.3 watts. Power is the ratio of the work done or the enrgy to the time period.

The rate of the work done is called the power output. It is denoted by P.Its unit of a watt.

The given data in the problem is;

E is the energy = 66 J

P is the power output =?

t is the time period = 0.9 sec

The power output is given as;

[tex]\rm P = \frac{E}{t} \\\\ \rm P = \frac{66}{0.9} \\\\ \rm P = 73.3 \ watt[/tex]

Hence power developed by a model rocket engine will be 73.3 watts.

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Answer:

See below

Explanation:

Force X distance = work

 200 N * 240 m = 48 000 N-m = 48 000 j

F = ma

200 = 800 a

a = 1/4 m/s^2

d = v t  + 1/2 a t^2

12 m/s t  + 1/2  1/4 m/s^2  t^2 = 240

                shows t = 17 sec  (via Quadratic Formula)

final velocity = 12 + at = 12 + 1/4(17) = 16.26 m/s

Answer:

Ethical Guidelines for Research With Human Subjects

Participation Must Be Voluntary.

Researchers Must Obtain Informed Consent.

Researchers Must Maintain Participant Confidentiality

Explanation:

Basta Yun na yan correct me if I'm wrong hehehhe

Old potential energy:-

New potential energy

Option B is correct

When a block is made of rough surfaces, the cylinders may eventually wear to the point where repairs are ineffective.

This is the force which occurs when two surfaces slide against each other. A rough surface have more friction than a smooth surface.

Friction causes wearing out of surfaces and may render repair works done ineffective in this case.

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Answer:

100,000 / 800,000 = 1 / 8    amount of sample after 12 hours

(1/2)^n = 1 / 8      after n half-lives 1/8 of sample will be left

n = 3

(D) is the correct answer - 1/2 half-life = 4 hours

Revolution and rotation are the terms that describe the different movements of the earth.

Our home planet is Earth. Earth and its moon, according to scientists, originated about the same period as the rest of the solar system.

That would have been around 4.5 billion years ago, according to scientists. Earth is the solar system's fifth-largest planet.

The rotation and revolution of the earth are two different movements. The movement of the earth on its axis is known as rotation.

Revolution is the movement of the earth around the sun in a fixed route or orbit. The earth's axis, which is an imaginary line, forms a 6612° angle with its orbital plane.

Hence revolution and rotation are the terms that describe the different movements of the earth.

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Answer:

F - M a      force exerted by scales on student

M a = M (9.8 + 4.9) m/s^2      upwards chosen as positive

a = 1.5 g        net acceleration of student  due to force of scales

W =M g       weight of student   (actual weight)

Wapp = M 1.5 * g      apparent weight (on scales) of student

In an elevator which is accelerating upwards with 4.9 m/[tex]s^{-2}[/tex], Mike's weight will be 1.5 times the actual weight.

Hence, the apparent weight will be 1.5 times the real weight.

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The given is:Mass – 2000 kg

The given is:Mass – 2000 kgInstantaneous speed – 10 meter per second

Step: 1K.E= 1/2mv^2

Where, K.E – Kinetic energy in joules:

m – Mass in kg

  v – Velocity or speed in meter per second

From the give,

m = 2000 kg

v = 10 m/s

Equation (1) becomes,

K.E= 1/2 (2000) (10)^2

= (0.5)(2000)(100)

= 100000

K.E = 100,000 Joules

The kinetic energy is 100,000 Joules, if a roller coaster of mass 2000 kg is rolling down a track with an instantaneous speed 10 m/s.

The material the parachute is made out of" will not be a suitable control variable as it is needed in the research.

It should be noted that a control variable simply means any variable that is held constant in a research.

In this case, the material the parachute is made out of" will not be a suitable control variable as it is needed in the research.

Therefore, it's false.

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Explanation:

The center of mass of a system acted on only by internal forces cannot accelerate. without friction a car cannot move. This is a consequence of Newton's third law

Answer:

12 m/sec

Explanation:

lambda = 2 m

period = 6 seconds     frequency = 1/p  = 1/6

speed = lambda * freq

            = 2 / 1/6 = 12 m/s

Answer:

Good human ears can detect sound from about 50 Hz to about 20,000Hz (20 kHz); this can be called the audible range of frequencies.

so c.50 hertz

Explanation:

Hope it helps :)

Answer:

50 hertz

Explanation:

This is right

Answer:

I dont know but ask a tutor

Explanation:

MOnkey Srry

An object in motion eventually stops because of friction.

Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or continue its moving in a straight line at constant speed unless force is applied on it.

So we can conclude that An object in motion eventually stops is the correct answer.

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Momentum of the given body will be : 75000 Kg m/s

According to Newton's first law of motion, all bodies continue to be in the state of rest or motion unless an external force is applied on the body. We can use this in the case of momentum also

The formula of momentum is given by :

[tex]:\implies \sf\quad \sf \: P = mv[/tex]

Here, we are given the mass of the body ( m ) as 3000kg and the velocity of the body ( v ) as 25 m/s. On putting the values in the formula:

[tex] \begin{aligned}&:\implies \sf\quad \sf \: P = mv \\& :\implies \sf\quad \sf \: P = 3000 \times 25 \\ & :\implies \sf\quad \sf \: \boxed{ \sf \: P = 75000kgm {s}^{ - 1} } \end{aligned}[/tex]

Momentum is associated with the mass of the moving body and can be defined as the quantity of motion measured as a product of mass and velocity.

Answer :-

Explanation :-

As per the provided information in the given question, we have been given that The Mass is 3000 kg . The Velocity is given as 25 m/s . And, we have been asked to calculate the Momentum .

For calculating the Momentum , we will use the Formula :-

[tex] \bigstar \: \: \: \boxed {\sf { \: Momentum \: = \: Mass \: \times \: Velocity \: }} [/tex]

Therefore , by Substituting the given values in the above Formula :-

[tex] \dag \: \: \: \sf { Momentum \: = \: Mass \: \times \: Velocity} [/tex]

[tex] \Longrightarrow \: \: \: \sf { Momentum \: = \: 3000 \: \times \: 25} [/tex]

[tex] \Longrightarrow \: \: \: \textbf {\textsf {Momentum \: = \: 75000 }} [/tex]

Hence :-

[tex] \underline {\rule {180pt} {4pt}} [/tex]

Answer:

A) would be the best explanation because hot air is less dense and would rise to the top of a column of air

Answer:

Sponges

Explanation:

It would be either sponges or flatworms.

I apologize if it is incorrect-
I hope it helps! Have a great day!

Anygays-

Answer:

945 joules

Explanation:

the formula for kenetic energy is:

0.5 × m × v^2

where m is in (kg) ane (v) is in meter per second.

so we can just use the formula;

0.5 × 2.1 × 30^2

so the answer is 945 joules