A dog whistle is designed to produce a sound with a frequency beyond that which can be heard by humans (between 20,000 Hz and 27,000 Hz). If a particular whistle produces a sound with a frequency of 25,000 Hz, what is the sound’s speed? Assume the wavelength of this sound wave in air is 0.013m. *
4 points
325 m/s
250 m/s
113 m/s
467 m/s

Answer:

1.44 X 10^-4J

Explanation:

V=w/q =605/sc=12V

The energy required to move a 4.00-micro coulomb charge through a potential difference of 36.0 volts will be 1.44 X 10⁻⁴ J.

The amount of work performed in an electrical field to move a unit charge from one location to another is defined as the electrical potential difference.

The given data in the problem is;

W is the energy =?

q is the charge = 4.00-microcoulomb

V is the potential difference = 36.0 volts

The electric potential is the ratio of electric potential energy and charge.

[tex]\rm V= \frac{W}{q} \\\\\ W=Vq \\\\ W= 36.0 \times 4.00 \times 10^{-6} \\\\ W=144 \times 10^{-6} \\\\ W=1.44 \times 10^{-4}[/tex]

Hence the energy required will be 1.44 × 10⁻⁴ J.

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Answer:

i think it is with friction because when we move we go against friction so like when were walking friction is trying to decrease our speed

Explanation:

Answer:

D, reeling in a fish

Explanation:

Answer:the answer is D. Reeling in a fish with a fishing pole

Explanation:

you have to pull on the fish with the fishing pole in order to catch the fish

hope this helps

Answer: C There would be a partial eclipse.

Explanation:

Partial solar eclipses happen when the Moon comes between the Sun and Earth, but the Moon only partially covers the Sun's disk. When this occurs, the Moon, the Sun and Earth don't align in a perfectly straight line, and the Moon casts only the outer part of its shadow on Earth. This happens when only a portion of the Sun is blocked by the Moon. It occurs when the observer is within the penumbra.

Answer: C partial eclipse

Explanation:

got it right:)

Answer:

B

Explanation:

Answer: B. Water molecules slow down until they begin to bond together

Explanation:                                                                                                                                  When the water is to be cooled, the molecules start to slow down and becomes no longer energetic which means that they are going to bond together.

card games

board games

bird watch

write a song

make a game

count stuff

throw a ball with someone

play outside

The speed of the players just after the collision is (D) 0.81 m/s

Given that the mass of the fullback is m = 88kg

mass of the opponent, M = 97 kg

speed of the fullback, u = 5 m/s

speed of the opponent, U = 3 m/s

In an inelastic collision, the two bodies move together at the same speed and the total momentum of the system remains conserved.

Let the final speed be v, then by conserving the momentum we get:

mu - MU = (m + M)v

Since the opponent must be moving in opposite direction to the fullback, therefore his momentum is -MU.

88×5 - 97×3 = (88 +97)v

149 = 185v

v = 0.81 m/s

So both the players move with a speed of 0.81 m/s

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Answer:

I picked all of these for a assignment I did.

Explanation:

Answer: At the molecular level, temperature is related to the random motions of the particles (atoms and molecules) in matter. ... The temperature of the puddle, or of any object, is a measure of the average of the individual translational energies of all of its atoms or molecules.

Explanation: my science teacher already tought us this

Answer:

The force between the two charges will be 13.22N.

Explanation:

The force between the two charges is given by Coulombs law which says

[tex]F = k\dfrac{Q_1Q_2}{R^2}.[/tex]

In our case

[tex]Q_1= 0.00045C[/tex],

[tex]Q_2 = 0.0000032C[/tex],

[tex]R = 0.99m[/tex].

therefore,

[tex]F = (9*10^9)\dfrac{(0.00045C)(0.0000032C)}{(0.99m)^2}.[/tex]

[tex]\boxed{F=13.22N}[/tex]

Hence, the force between the two charges will be 13.22N.

Answer:

C. because the moon is closer so it buldges or looks bigger

Explanation:

If the hydroxide ion (OH-) concentration is greater than the hydronium ion (H3O+) concentration, then the nature of the solution would be basic, therefore the correct answer is option B.

A chemical compound is a combination of two or more either similar or dissimilar chemical elements.

If the hydroxide ion (OH-) concentration is equal to the hydronium ion (H3O+) concentration then the nature of the solution would be neutral.

The correct response is option B because the nature of the solution would be basic if the concentration of hydroxide ions (OH-) is higher than that of hydronium ions (H3O+).

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Answer:

Bromine: 2 Chlorine: 1 Iodine: 3

Explanation:

hope this helps yall

Answer:

Bromine:

2

Chlorine:

1

Iodine:

3

Explanation:

Answer:

--

Explanation:

All potential and kinetic energy is transferred into heat. Therefore keeping the law of conservation of energy valid. No energy is created nor destroyed only changing shape.

Answer:

1,2,3,6

Explanation:

This is correct because i took the quiz and got it correct

1 2 3 and 6 are convex lenses.

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If you traveled to Mars, your mass would be exactly, precisely equal to your mass on Earth, PROVIDED you did not relieve the boredom of space travel by eating too many astronaut steaks along the way.

The only things that can affect your mass are your personal diet, exercise, sleep, and stress habits.  

Your mass has nothing to do with gravity. Your WEIGHT has.

Answer:

299 792 458 m / s

Explanation:

Answer: 4.41 joules

Explanation:

Given that:

work is done by gravity = ?

Mass of pine cone (m) = 50g

Convert mass in grams to kilograms

Since 1000g = 1kg

50g = (50/1000) = 0.05kg

Height of tree (h) = 9 m

Apply the formula for work,

Work = mass x acceleration due to gravity x height

Acceleration due to gravity has a value of 9.8m/s^2

Work = mgh

Work = 0.05kg x 9.8ms^2 x 9m

Work = 4.41J

Thus, 4.41 joules of work is done by gravity.

Answer:

4.5 J

Explanation:

I took the test

Answer: 2.7 x 10^5 joules

Explanation:

Given that:

Time taken = 3 minutes

convert time in minutes to seconds

(Since 1 minute = 60 seconds

3 minutes = 3 x 60 = 180 seconds)

Power of toaster = 1500 watt

Work done by the toaster = ?

Recall that power is the rate of work done per unit time

i.e Power = work/time

work = Power x Time

Work = 1500 watt x 180 seconds

Work = 270000J

Place the result in standard form

270000J = 2.7 x 10^5J

Thus, 2.7 x 10^5 joules of work is done by the toaster.

Answer:

Braking distance of vehicle is 9.97 m

Explanation:

It is given initial velocity of the vehicle u = 13.4 m/sec

Acceleration of the vehicle [tex]a=-9m/sec^2[/tex]

As the vehicle finally stops so final velocity of the vehicle v = 0 m/sec

We have to find the braking distance s

From third equation of motion

[tex]v^2=u^2+2as[/tex]

[tex]0^2=13.4^2+2\times -9\times s[/tex]

s = 9.97 m

So braking distance of the vehicle is 9.97 m

Answer: 13.46 m/s

Explanation:

Initial velocity V1 = 5.82 m/s

acceleration A = 2.35m/s^2

Time taken T = 3.25s

Final velocity V2 = ?

Recall that acceleration is the rate of change of velocity per unit time i.e acceleration = (V2 - V1)/T

2.35m/s^2 = (V2 - 5.82 m/s) / 3.25s

cross multiply

2.35m/s^2 x 3.25s = (V2 - 5.82 m/s)

7.6375m/s = V2 - 5.82 m/s

V2 = 7.6375m/s + 5.82m/s

V2 = 13.46 m/s

Thus, the car final velocity is 13.46 m/s

Answer:

The final velocity is 13.5m/s

Explanation:

a = (v-u)/t

2.35 = (v-5.82) / 3.25

7.6375 = v - 5.82

v = 7.6375 + 5.82

v = 13.5 m/s

Answer:

The atomic number is the number of protons in an atom of an element. In our example, krypton's atomic number is 36. This tells us that an atom of krypton has 36 protons in its nucleus.

Explanation:

Depends on what kind of atom it is. The number of protons can be seen in the periodic table as the atomic number. The number of proton within an atom is always equal to the number of electron.

Answer:

C. Seed C germinates more with more water.

Explanation:

In this experiment, the seed (seed C) was subjected to certain conditions and the result is what has been presented for us to make an inference.

We observe the following from the information given us:

I. the same seeds were used for the experiment

II. the same heat medium of 24 °C was used for all the seeds

III. different daily amount of water was supplied the seeds - 90 ml, 50 ml and 10 ml

From the experiment, we have this result:

the seed that was watered with 10 ml daily did not sprout anything, the seed that was watered with 50 ml daily yielded 12 sprouts while the seed that was watered with 90 ml daily yielded 16 sprouts

When we consider the amount of water given the seed & the produce of the seed, it is safe to conclude that with increase in daily water, there is increase in the number of sprouts by the seed

Hence, C. Seed C germinates more with more water is the correct answer

The given experiment shows that Seed C's germination is directly proportional to the amount of water it receives. More water results in more sprouts.

From the given experiment results, the conclusion can be drawn that Seed C germinates more with more water. This is evident as the seed sprouted 16 times with a daily water method of 90 mL, 12 times with 50 mL, and not at all with 10 mL. So, the amount of sprouts is directly proportional to the amount of water provided, the more the water, the more the sprouts. This supports the option that Seed C germinates more with more water. Also, the heat was kept constant to ensure that it doesn't affect the experiment results.

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The Pancreas

Is an inflammation organ that lies in the lower part of the stomach which plays a big part in the digestive system.

Answer:

The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.

Have a good day! :D

Answer:

valley

Explanation:

a valley is the space between two mountains and may comprise a river as well

Answer:

The iron ball is suspended from a box that floats in water. The box has a height of 5.00 cm, a face area of 10.0 cm ​ 2 ​ , and a density of 0.30 g/cm3, and 2.00 cm of its height is above the water surface. What’s the radius of the ball? Hints: ❏ Identify all forces acting on the box and write Newton’s second law. ❏ The box is stationary, which means the forces (including buoyant force) are balanced. You can use this to find tension in the rope. ❏ Identify all forces acting on the ball and write Newton’s second law. ❏ Iron ball is stationary, which means the forces (including buoyant force) are balanced.

Step by step:

Answer:

Force meter

Explanation:

Answer:

.o.o

Explanation:

678