Suppose you wanted to produce a sound wave with a wavelength of 1m
in room temperature air. What would its frequency be? *​

Answer:

The solved problem is in the photo. Hope it helps.

Answer:

by power and electricity

Explanation:

Answer: Lighter, positively charged particles form at the top of the cloud. Heavier, negatively charged particles sink to the bottom of the cloud. When the positive and negative charges grow large enough, a giant spark - lightning - occurs between the two charges within the cloud.

Explanation:

Answer:

300m

Explanation:

D=S×T

D=1500×0.2

Answer:

I beleive it would shoot very far up into the sky

Explanation:

Answer:It slows down and eventually gravity pulls it to ground and it stops

Explanation:

Air resistance slows it down

Answer:

0

7500J

7500J

Explanation:

Given parameters:

Mass of car  = 600kg

Velocity  = 5m/s

Unknown:

Original kinetic energy  = ?

Final kinetic energy  = ?

Work used  = ?

Solution:

The kinetic energy of a body is the energy due to the motion of a body.

It can be solve mathematically using expression below;

                K.E  = [tex]\frac{1}{2}[/tex]  m v²

  where m is mass

              v is velocity

original kinetic energy;

  The car started at rest and v = 0, therefore K.E  = 0

Final kinetic energy;

           K.E  = [tex]\frac{1}{2}[/tex]  x 600 x 5²   = 7500J

Work done:

   Work done  = Final K.E  - Initial K.E  = 7500 - 0 = 7500J

Answer:

0 ; 7500; 7500

Explanation:

Its correct I just completed it.

Answer:

 "The distance between crests is 3 cm." 

Explanation:

If he writes down "The distance between crests is 3 cm." 

That means he is describing the wavelength of a wave and not longitudinal wave. He ought to write something about " direction "

Longitudinal waves are waves in which the displacement of the medium is in the same direction as, or parallel to, the direction of propagation of the wave. While

Wavelength is the distance between the two successfully Crest or trough

the answer IS NOT "An ammeter, which measures current"

Explanation:

(i) Height of tree, h = 4 m

Mass of Ninja, m = 30 kg

The gravitational potential energy on the top branch of the tree is given by :

[tex]P=mgh[/tex]

g is acceleration due to gravity

[tex]P=30\ kg\times 9.8\ m/s^2\times 4\ m\\\\P=1176\ J[/tex]

(ii) If he were at a height of 2 meters from the ground, its potential energy will be :

[tex]P=mgh[/tex]

g is acceleration due to gravity

[tex]P=30\ kg\times 9.8\ m/s^2\times 2\ m\\\\P=588\ J[/tex]

Therefore, this is the required explanation.

Answer:

In isotropic substances, there are only two optical properties that can be determined. One of these is the absorption color, as discussed above. The other is the refractive index. Tables of refractive indices for isotropic minerals, list only the refractive index for one wavelength of light.

Explanation:

The correct answer is an inverse relationship.

This is because according to the graph as the mass increases the acceleration decreases as shown by the downward curve.

Answer:

By altering the quantum interactions of the electrons in the atoms of a metal's atoms, scientists from the University of Leeds have generated magnetism in metals that aren’t normally magnetic.

Explanation:

Water must absorb energy in order to melt, evaporate, or get warmer.

Explanation:

Given that,

Area of large piston, [tex]A_1=250\ cm^2[/tex]

Area of small piston, [tex]A_2=25\ cm^2[/tex]

Force applied to large piston, [tex]F_1=m_1g=1500\times 10=15000\ N[/tex]

It is required to find the force applied to the small piston. The pressure in each chamber must be equal so, that,

[tex]\dfrac{F_1}{F_2}=\dfrac{A_2}{A_1}[/tex]

F₂ is force applied to smaller piston

[tex]F_2=\dfrac{F_1A_1}{A_2}\\\\F_2=\dfrac{15000\times 250}{25}\\\\F_2=150000\ N\\\\F_2=150\ kN[/tex]

So, the force of 150 kN must be applied to the small piston.

To raise the car using a hydraulic lift, a force of 1500 N must be applied to the small piston.

To determine the force needed to raise a car using a hydraulic lift, we can apply the principles of Pascal's law. According to Pascal's law, the pressure in a fluid is transmitted equally in all directions. In this case, the pressure exerted on the larger piston is equal to the pressure exerted on the smaller piston. We can use the equation:

F1/A1 = F2/A2

Where F1 is the unknown force applied to the small piston, A1 is the cross-sectional area of the small piston, F2 is the weight of the car (mg), and A2 is the cross-sectional area of the large piston.

Given that A1 = 25 cm^2, A2 = 250 cm^2, and the mass of the car is 1500 kg, we can solve for F1:

F1 = (F2 * A1) / A2

Substituting the known values:

F1 = (1500 kg * 9.8 m/s^2 * 0.0025 m^2) / 0.025 m^2 = 1500 N.

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Answer:

9727160J

Explanation:

Given parameters:

Height of elevator rise  = 436m

Force exerted  = 22310N

Unknown:

Work done by the elevator lifting mechanism = ?

Solution:

The work done by a body is the force applied to move a body in a specific direction;

          Work done  = force x distance moved

In this case, the force and distance moved is provided already;

        Work done  = 22310 x 436  = 9727160J

The work done on the elevator car by the elevator's lifting mechanism is calculated using the work formula which is the product of the exerted force and the distance travelled, resulting in a total work of 9,731,160 joules.

The question requires us to calculate the work done on an elevator car by the elevator's lifting mechanism. To find this out, we use the work formula:

Work (W) = Force (F) × Distance (d)

Given:

To calculate the work done, we multiply the force by the distance:

W = F × d

W = 22310 N × 436.0 m

W = 9,731,160 J

The work done by the elevator's lifting mechanism is 9,731,160 joules (J).

Answer:

Rp = 10 Ohms; I = 0.9 Amps

Explanation:

Since, there are two resistors each with 20Ω connected in parallel, the total resistance of the combination (Rp) of the circuit is as follows:

i.e 1/Rp = (1/R1 + 1/R2)

1/Rp = (1/20Ω + 1/20Ω)

1/Rp = (1 + 1)/20Ω

1/Rp = 2/20Ω

1/Rp = 1/10Ω

To get the value of Rp, cross multiply

Rp x 1 = 10Ω x 1

Rp = 10Ω

Apply the formula

Voltage V = Current I x Total resistance Rp

I = V/Rp

I = 9V/10Ω

I = 0.9 Amps

Thus, the total resistance is 10 Ohms, the current through the ammeter is 0.9 Amps

As we know that, if n resistances R1 , R2 and R3 .... Rn are joined in parallel the equivalent resistance is given as :

[tex] \boxed{ \sf{ \dfrac{1}{R_p} \: = \: \dfrac{1}{R_1}\: + \: \dfrac{1}{R_2} \: + \: \dfrac{1}{R_3} \: \: .... \: \dfrac{1}{R_n} }}[/tex]

R1 = 20Ω

R2 = 20Ω

Putting the values,

[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \dfrac{1}{20Ω}\: + \: \dfrac{1}{20Ω}}[/tex]

[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \dfrac{1 \times 1}{20}\: + \: \dfrac{1 \times 1}{20}}[/tex]

[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \: \dfrac{1 \: + \: 1}{20}}[/tex]

[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \: \dfrac{2}{20}}[/tex]

[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \: \cancel\dfrac{2}{20}}[/tex]

[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \dfrac{1}{10}}[/tex]

[tex]: \longmapsto \: \pink{\bf{R_p\: = \: 10Ω }}[/tex]

Current through the ammete:-

As we know that,

Here ,

Putting the values,

[tex]\longmapsto \: \sf{I \: = \: \dfrac{9}{10 } }[/tex]

[tex] \longmapsto \: \red{\bf{I \: = \: 0.9}}[/tex]

Answer:

8.37×10⁻⁴ N/C

Explanation:

Electric Field: This is the ratio of electrostatic force to electric charge. The S.I unit of electric field is N/C.

From the question, the expression for electric field is given as,

E = F/Q.......................... Equation 1

Where E = Electric Field, F = force experienced by the charged balloon, Q = Charge on the balloon.

Given: F = 8.2×10⁻² Newton, Q = 9.8×10 Coulombs = 98 Coulombs

Substitute these values into equation 1

E = 8.2×10⁻² /98

E = 8.37×10⁻⁴ N/C

Hence the Electric Field of the charged balloon =  8.37×10⁻⁴ N/C

Answer:

8.36*10^-4N/C

Explanation:

To find the electric field you use the following formula:

[tex]F=qE\\\\E=\frac{F}{q}[/tex]

F: electric force = 8.2*10^-2 N

q: charge of the balloon = 9.4*10 C

By replacing F and q you obtain:

[tex]E=\frac{8.2*10^{-2}N}{9.4*10}=8.36*10^{-4}\frac{N}{C}[/tex]

hence, the electric field is 8.36*10^-4N/C

Answer:

Explanation:

The index of refraction, also called the refractive index, is a value calculated by the comparison of the movement of the light in two different environments.

Specifically, the index of refraction can be defined by

[tex]n=\frac{c}{v}[/tex]

Where [tex]n[/tex] is the refractive index, [tex]c[/tex] is the speed of the light in free space and [tex]v[/tex] is the speed of the light inside the medium.

However, the most important characteristic of this equation is the relation between [tex]n[/tex] and [tex]v[/tex], notice that they are inversely proportional. In other words, when the frequency increases, the refractive index decreases; when the frequency decreases, the refractive index increases.

Now, we know that green-blue light has lower frequency than violet light, which means the refractive index for violet light is gonna be less than 1.35, which is the index for green-blue light.

Therefore, the right answer is C.

Answer:

B

Explanation:

Final answer:

Statements A 'Gravity exists only on Earth' and E 'Gravity doesn't exist between Earth and the sun' are not true about gravity. Gravity is a universal force that exists everywhere in the universe and acts between any two objects with mass, including Earth and the Sun.

Explanation:

Statements A and E given in the question are not true about gravity. These options should be checked as they do not accurately describe the gravitational force as we understand it in physics.

A. Gravity exists only on Earth. This statement is incorrect because gravity is a universal force that acts between any two objects that have mass, no matter where they are in the universe. It's not a phenomenon exclusive to Earth.

E. Gravity doesn't exist between Earth and the sun. This statement is false because there is a significant gravitational force between Earth and the Sun, which is responsible for keeping Earth in orbit around the Sun.

On the other hand, statements B, C, and D are accurate descriptions of gravitational force:

B. Gravity exists between two objects that have mass. This statement is true as the gravitational force is indeed a result of the mass of objects.

C. Gravity is a force that pulls two objects together. This is the basic definition of gravity - it attracts two bodies towards each other.

D. Gravity exists in the whole universe. Gravity is a fundamental force that acts everywhere in the universe, not just on Earth or within our solar system.

Answer:

The first answer to the first column is Doldrums, the second is prevailing westerlies, the last answer is trade winds

Explanation:

I got this answer because I did it on the test

The wind belt that occurs at about about 5 degrees north and south of the equator is doldrums.

The wind belt that starts at the horse latitudes and moves toward the poles is the prevailing westerlies.

The winds that are found primarily in the tropics are trade winds.

Doldrums refer to the equitorial region of the Atlantic Ocean that has storms and unpredictable winds.

Prevailing westerlies are the winds that can be found in the middle latitudes which blow from high pressure area towards the pole. Trade winds are the east to west prevailing winds that flow in the equitorial region of the Earth.

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Answer:

I believe it would be C. friction and gravity

Explanation:

They both deal with pulling/pushing objects.

Answer:

This is an example of SPEED.

Answer: velocity

Explanation:

Final answer:

Lifelong physical activity provides multiple health benefits, including cardiovascular and muscular fitness, improved bone density, cognitive function, and weight management, which contribute to a better quality of life and extended life expectancy.

Explanation:

One significant benefit of lifelong physical activity is the improvement of overall health, which manifests in multiple dimensions. Engaging in physical activity from a young age helps in maintaining cardiovascular and muscular fitness, improving bone density and strength, enhancing cognitive function, and aiding in weight management. Moreover, regular exercise contributes to improved quality of life and can extend life expectancy.

For instance, older adults can experience a lower risk of falls and related injuries, while individuals of all ages can enjoy benefits such as reduced risk factors for cardiovascular disease, hypertension, obesity, and certain types of cancer. Additionally, physical activity plays a protective role against mental health issues like depression, due to its potential to increase the synthesis of natural euphoriants in the brain. Crucially, even those with chronic conditions can find physical activity more beneficial than harmful, emphasizing the universal importance of an active lifestyle.

Habitat fragmentation is a cost of urban development.

Option: A

Explanation:

Though from the view point or perspective of up gradation and development urban development is much needed but in cost of habitat fragmentation which feels very bitter. As habitat fragmentation leads to the loss of habitat, disruption of ecological cycle and environmental equilibrium.

Actually in the name of urban development we the human use our bread giver environment in a wrong way which causes natural disasters in long run. Animals become endangered , vulnerable and extinct with passage of time. Because they forced to enter into human settlements.

Answer:

A

Explanation:

Explanation:

The acceleration of a body is defined as the rate of change of velocity per unit time. Its mathematical form is given by :

[tex]a=\dfrac{v-u}{t}[/tex]

Here,

u is initial speed of a body

v is final speed

t is time taken

Uniform acceleration means that the velocity of an object changes by an equal amount in every equal time period. Hence, the correct option is (c) " Its velocity increases by increasing amounts in equal time intervals".

Answer:

Explanation:

The melting point of the solid is 80°C

        Vapor point of the liquid is 140°C

What happens to particles of X when heated from 70°C to 85°C?