Which action could a student take to produce a longitudinal wave with a large amplitude?
A. Drop a pebble in a pond.
B. Light a candle.
C. Bang on a drum.
D. Stand as still as possible.

Answer:

The type of reaction represented by the model is an;

Exothermic reaction

Explanation:

Exothermic reaction reaction is a reaction that involves the giving off of excess energy as heat and or light by two or more reactants during a chemical reaction due to the higher combined energy of the reactants compared with the product

The analogy are;

The sponge balls are the reacting atoms

The water is the energy which they contain

The water given off is the excess energy which the compound formed by putting together the two soaked sponge balls is unable to hold.

Answer:

The Liver, Pancreas and Gall Bladder are involved in the process of delivering the digestive juices for the Intestines

Explanation:

Answer:

400N

Explanation:

F= ma

F= 100 x 4

F= 400N

Answer:

The Magnitude of the angle of reflection equals that of Incidence from the Law of reflection

So its 50°.

Explanation:

Answer:

nuclear fission

Mercury is present in zinc plate which is used in simple cell

Answer:

They first spend it on necessities.

Answer:

b. compensate for changes in the Earth's atmosphere and achieve better resolution.

Explanation:

Q.1 - V = u + at

u = 0, a = g = 9.8, t = 1

V = 0+9.8*1 = 9.8 m/s

Q 2- In horizontal position the velocity remains same hence a= dv/t, since change in velocity is zero the acceleration also equal to zero

Q.3- After neglecting the air resistance at 45° angle the maximum range is obtained.

let's prove, consider the range have maximum angle at θ, now range is given by

R = u²Sin2θ/g where sin2θ can we written as 2sinθ.cosθ.

Now the range value is directly proportional to the product of sin & cos of firing angle & this maximum value is obtained at 45°

Q.4 The range of two angle will be same if and only if they give 90° on addition.

20+x = 90,

x = 90-20 = 70°

Q.5 The motion with constant acceleration is known as uniformly accelerated motion.

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Answer:

Explanation:

1.

u=0m/s

v=?

a=9.8m/s²

t=1sec

now

we have

v=u+at

v=0+9.8*1

v=9.8m/s

3.

angle is measured in sin and cos angle where maximum angle's value is gained by 45°

4.

we have

range

R=[tex]\frac{u²sin2\theta}{g}[/tex]

For

angle =20°

R1=[tex]\frac{u²sin2*20}{g}[/tex].......[1]

another angle be [tex]\theta[/tex]

R2=[tex]\frac{u²sin2\theta}{g}[/tex].......[2]

since R1=R2

By comparing we get

Sin40=Sin([tex]2\theta[/tex])

Sin(180-40)=Sin([tex]2\theta[/tex])

we

140=[tex]2\theta[/tex]

[tex]\theta[/tex]=70°

Answer:

When electric current weakens then the magnetic field around the wire also weaken

Explanation:

The magnetic field produced by electrical wire is directly proportional to the electricity flowing through it.

Thus, in case when electric current weakens then the magnetic field around the wire also weaken.

Answer:

The field gets weaker

Explanation:

took the quiz!

Explanation:

[tex]speed : U = 20 \: m {s}^{ - 1} \\ {V}^{2} = {U}^{2} + 2aS \\ 0 = {20}^{2} + (2 \times a \times S) \\ a = \frac{200}{S} \: m {s}^{ - 1} [/tex]

Answer:

v = 12.8 m/s

Explanation:

Applying the law of conservation of energy:

[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]

where,

m₁ = mass of baseball = 149 kg

m₂ = mass of catcher = 57 kg

u₁ = initial speed of ball = 17.7 m/s

u₂ = initial speed of catcher = 0 m/s

v₁ = v₂ = v = final speed of ball and the final speed of catcher = ?

both are same because ball is in hands of cathcer in the final state.

Therefore,

[tex](149\ kg)(17.7\ m/s)+(57\ kg)(0\ m/s)=(149\ kg)(v)+(57\ kg)(v)\\\\v = \frac{2637.3\ kgm/s}{206\ kg}[/tex]

v = 12.8 m/s

Correct question:

Imagine that a 1200 kg vehicle speeds up from rest to 20.0 m/s in 80 s.

How much work was done on the car? (Answer in 3 sig figs)

Answer:

the work done on the vehicle is 2.40 x 10⁵ J

Explanation:

Given;

mass of the vehicle, m = 1200 kg

initial velocity of the vehicle, u = 0

final velocity of the vehicle, v = 20 m/s

time of motion of the vehicle, t = 80 s

The distance moved by the vehicle is calculated as;

[tex]s = (\frac{v + u}{2} )t\\\\s = (\frac{20+ 0}{2} )(80)\\\\s = 800 \ m[/tex]

The force applied to the vehicle is calculated as;

[tex]F = ma = \frac{m v}{t} = \frac{1200 \times 20}{80} = 300 \ N\\\\[/tex]

The work done on the vehicle is calculated as;

W = F x d

W = 300 x 800

W = 2.4 x 10⁵ J.

Therefore, the work done on the vehicle is 2.40 x 10⁵ J

Answer:

The material you're looking for is insulation.

Explanation:

It reduces and/or stops electricity waves, heat waves, and sound waves from going past.

Answer:

C. Photosynthesis

Explanation:

Photosynthesis is a process by which plants and photosynthetic bacteria obtain their food in presence of sunlight from water and carbon dioxide. They produce glucose as the food and oxygen is emitted as the byproduct. The equation for photosynthesis is - 6H2O+6CO2 → C6H12O6 + 6O2

Thus, the correct answer is 'C.Photosynthesis.'

[tex]\huge{ \mathfrak{ \underline{Áñswér: }}}[/tex]

A change in state is considered a :

[tex] \hookrightarrow { \mathbb{\: physical \: change}}[/tex]

[tex]\#TeeNForeveR [/tex]

Answer:

i would say the third one

Explanation:

may i be brainliest?

We could choose to leave out the switch and simply join the wires together and the bulb will still light up.

A circuit is defined as pathway that has been designed for the flow of current. Now we know that a circuit must have a battery, connecting wires and the bulb itself.

However, we could choose to leave out the switch and simply join the wires together and the bulb will still light up.

Learn more about circuit: https://brainly.com/question/365923

Answer:

[tex]T=9.42Nm[/tex]

Explanation:

From the question we are told that:

Radius [tex]r= 0.5 m[/tex]

Current [tex]I= 3.0 A[/tex]

Normal vector [tex]n=\frac{(2i - j +2k)}{3}[/tex]

Magnetic field [tex]B= (2i-6j) T[/tex]

Generally the equation for Area is mathematically given by

 [tex]A=\pi r^2[/tex]

 [tex]A=3.1415 *0.5^2[/tex]

 [tex]A=0.7853 m^2[/tex]

Generally the equation for Torque is mathematically given by

 [tex]T=A(i'*B)[/tex]

Where

 [tex]i'*B= \begin{bmatrix}2&-1&2\\2&-6&0\end{bmatrix}[/tex]

 [tex]X\ component\ of\ i'*B= [(-1 * 0)-(2*-6)][/tex]

 [tex]X\ component\ of\ i'*B=12[/tex]

Therefore

 [tex]T=0.7853*12[/tex]

 [tex]T=9.42Nm[/tex]

Answer:

395 m/s

Explanation:

By using the first equation of motion,

→ v = 75 + 8(40)

→ v = 75 + 320

→ v = 395

Answer:

Atoms are composed of electrons (charge -1), protons (charge +1), and neutrons (no charge). So in a neutral atom the correct answer is "D".

Answer:

20 meters.

Explanation:

In the graph, the x-axis (the horizontal axis) represents the time, while the y-axis (the vertical axis) represents the distance.

If we want to find the distance covered in the first T seconds, you need to find the value T in the horizontal axis.

Once you find it, we draw a vertical line, in the point where this vertical line touches the graph, we now draw a horizontal line. This horizontal line will intersect the y-axis in a given value. That value is the total distance travelled by the time T.

In this case, we want to find the total distance that David ran in the first 4 seconds.

Then we need to find the value 4 seconds in the horizontal axis. Now we perform the above steps, and we will find that the correspondent y-value is 20.

This means that in the first 4 seconds, David ran a distance of 20 meters.

Answer:

B: 50 N/m

Explanation:

Hopes it help.

The spring constant of the spring is 50 N/m. The correct option is B.

When the spring is compressed, it gets compressed up to its elastic limit. When load is removed from the spring, it regains its shape and obtains equilibrium position. The energy stored in this process is called as spring potential energy.

Given a spring has 100 J of EPE when it is stretched 2 m. The energy stored in the spring is given by

SPE = ½ kx²

100 = ½ k (2 m)²

k = 50 N/m

So, spring constant of the spring is 50 N/m.

Thus, the correct option is B.

Learn more about spring potential energy.

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#SPJ2

If an external force and the frictional force are acting on a body, which is in rest on the floor and are equal and opposite, then the frictional force is Static friction.

Answer:

The red car would experience the greatest acceleration.

Explanation:

Newton says that Force equals mass times acceleration or F = ma

We get a = F/m

If we want the greatest acceleration or a, mass or m must be the lowest.

Explanation:

Given that,

The frequency of microwaves, [tex]f=9\times 10^9\ Hz[/tex]

The time period of the wave is :

[tex]t=\dfrac{1}{f}\\\\t=\dfrac{1}{9\times 10^9}\\\\t=1.1\times 10^{-10}\ s[/tex]

Let [tex]\lambda[/tex] is the wavelength of the wave. We know that,

[tex]v=f\lambda\\\\\lambda=\dfrac{v}{f}[/tex]

Put all the values,

[tex]\lambda=\dfrac{3\times 10^8}{9\times 10^{9}}\\\\\lambda=0.03\ m[/tex]

Hence, this is the required solution.

Answer:

A microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

Explanation:

Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

The period is the time that elapses between the emission of two consecutive waves. In other words, it is the time it takes for a complete wave to pass a reference point. The period (T) is simply the inverse of the frequency (f):

[tex]T=\frac{1}{f}[/tex]

In this case, f=5*10¹⁰ Hz. So, replacing in the definition of period T:

[tex]T=\frac{1}{5*10^{10} Hz }[/tex]

Solving:

T= 2*10⁻¹¹ seconds

A microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

A microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

The fequency is defined as the number of cycles achieved by the any wave it is expressed in hertz.

Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

The period is the time that elapses between the emission of two consecutive waves. In other words, it is the time it takes for a complete wave to pass a reference point. The period (T) is simply the inverse of the frequency (f):

[tex]T=\dfrac{1}{f}[/tex]

In this case, f=5*10¹⁰ Hz. So, replacing in the definition of period T:

[tex]T=\dfrac{1}{5\times 10^{10}}=2\times 10^{-11}\ Sec[/tex]

A microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

Thus a microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

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