What frequency will you hear if a truck is driving toward you at 20 m/s sounding a horn of frequency 300 Hz. Assume the speed of sound to be 340 m/s.

Answer:

I think its oxygen, a conductor is something that allows heat very easily.

Explanation:

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Answer: Sound has vibrations of molecules and it spread through the air

Explanation: Pretty much what this means you need molecules to produce sounds and in space there isn't any. On the other hand light is a electromagnetic waves and those waves do not need a medium to travel through

Light can travel through outer space, unlike sound, because light is composed of electromagnetic waves that don't need a medium to propagate. In contrast, sound waves are mechanical and require a medium to travel through, which is absent in the vacuum of outer space.

The reason light can travel through outer space, but sound cannot is due to the type of waves these two are and what they require to propagate. Light is composed of electromagnetic waves, which are generated by charged particles and do not require a medium to propagate. This quality allows light to travel in a vacuum, such as outer space.

On the other hand, sound waves are mechanical waves. This means they require a medium—be it solid, liquid, or gas—to transmit their energy and thus, to propagate. In the vacuum of outer space, where there is no air or other medium for sound waves to travel through, sound cannot be propagated.

To illustrate, if you're observing a fireworks display, you'll see the burst of light before you hear the sound because light travels faster and does not need a medium like sound does. In the vacuum of outer space, you would see the light from the fireworks, but never hear the explosion.

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Luminosity is the amount of light a star directly emits from its surface.

Luminosity is a measure of the amount of light a star directly emits.

Answer : Option A

Explanation:

Light intensity is similar to brightness of the light where it is a measure of amount of light focused with respect to area and its unit is called as lux represented by lx.

Different light has different wavelengths according to the electromagnetic spectrum. Luminosity is the best option from the given ones as is a measure of amount of light emitted from an object which is here referred to a star.

Answer:

Salutation

Explanation:

This statement would be incorrect see because water would drip through a cup no matter how heavy because its a liquid and with it having no natural shape it can squeeze through the holes of the cup

The given statement is false.

The water will leak through the holes in bottom not because it is heavier than the cup but because for the reason it is a liquid.

Explanation:

The water is a liquid with a standard viscosity, even with lighter viscosity or heavy viscosity, it will eventually leak out of the cup with the hole in the bottom as the liquid holds the shape of the container unlike solid and thus with hole, leaks out.  

Answer:c

Explanation:

i did the usatestprep

Answer:

The electron releases energy as it moves to a lower energy level.- last choice

An "excited state" is a condition where the electron has MORE energy.  The "ground state" is the lowest energy level, where the electron has the minimum possible energy.

So, when an electron moves from an excited state to the ground state, it loses energy.  The electron releases energy as it moves to the lowest energy level.

(last choice)

Answer:A it is dissolved in water

Lítio é metal  

Hélio é gás nobre

Neônio é gás nobre  

Cálcio não é gás nobre  

Os gases nobres são os elementos da família 18 da Tabela Periódica, que são: hélio, neônio, argônio, criptônio, xenônio e radônio.  

The elements are not noble gases include Lithium and calcium. The  correct option are C and D.

Noble gases are the  elements of Group 18 of the periodic table. The elements are namely, helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and Oganesson (Og).

The noble gases are always stable. They do not have any valence electrons to share with any other elements. They have neutral charge.

Thus, Lithium and calcium are not noble gases.

Learn more about noble gas.

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Answer:

The image is virtual and smaller than the object.

Explanation:

A concave lens is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its center than at its edges.

It always produces virtual images because the image appears to form on the same side of the lens where the object is placed.

The image is always smaller than the object. Far the object, smaller will be its image.

A light ray diagram of a concave lens is attached for a better understanding.

Answer:

=9.72 m/s

Explanation:

From the Newton's laws of motion;

x=2(v²cos∅sin∅)/g

Using geometry we see that 2 cos∅sin∅ = sin 2∅

Therefore, x= (v²sin 2∅)g,  where v is the take off speed x the range and ∅ the launch angle.

Making v the subject of the formula we obtain the following equation.

v=√{xg /(sin 2∅)}

x=7.80

∅=27.0

v=√{7.8×9.8/sin(27×2)}

v=√94.485

v=9.72 m/s

To find the takeoff speed of an athlete performing a long jump, we can use the principles of projectile motion.

To calculate the takeoff speed of an athlete performing a long jump, we can use the principles of projectile motion. Since the jump is treated as a projectile, we can break down the motion into horizontal and vertical components.

First, we need to find the vertical component of the takeoff speed. We know that the jumper leaves the ground at a 27.0 degree angle and lands 7.80m away. The vertical displacement can be calculated using the equation:

Δy = v0y * t - (1/2) * g * t^2

The horizontal component of the takeoff speed can be found using the equation:

Δx = v0x * t

By combining these two equations and solving for the takeoff speed, we can determine the answer.

Answer:

5/9

Explanation:

First, find a common factor for 30 and 54.

30 and 54 can both be divided by 2.

30 divided by 2 = 15

54 divided by 2 = 27

So, your new fraction is 15/27.

However, don't stop there.

15 and 27 can both be divided by 3 as well.

15 divided by 3 = 5

27 divided by 3 = 9

So, your final answer is 5/9.

I hope this helps! :)

Answer:

5/9

Explanation:

Let Vb = the velocity of the boat.

Vw = the velocity of the flow of the stream.

X = the distance the boat traveled downstream.

So X = (Vb+Vw)T

After turning, the boat takes t time to get back to the float.

Then x -l = (Vb-Vw)t

and l = Vw * (T+t)

Replacing the equations for their variables you get (Vb+Vw)T-Vw(T+t) = (Vb-Vw)t

Simlify to: Vw = l/T+t = l/2T

Now using the values in the problem:

Vw = 12km / 2 * 60 = 12 km / 2hrs = 6km

The answer is 1. 6 km h^-1

Answer:

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Carbonation, Hydrolysis and Oxidation all relates to chemical reactions with the rocks - so these are forms of Chemical weathering

Frost wedging is where the rocks and earth is broken apart by water freezing and turning to ice. It has nothing to do with rocks themselves changing in their chemical composition. So this is a type of physical weathering.

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Answer:

Frost wedging is a type of physical weathering.

Hydrolysis, oxidation and carbonation are all under chemical weathering

Therefore; frost wedging is a type of physical weathering

Answer:

The Greeks used static electricity to study amber.

D. 51 N. The minimum applied force that will cause the television slide is 51 N.

In order to solve this problem we have to use the force of static friction equation Fs = μs*n, where μs is the coefficient of static friction, and n is the normal force m*g.

With μs = 0.35, and n = 15kg*9.8m/s² = 147 N

Fs = (0.35)(147 N)

Fs = 51.45 N

Fs ≅ 51 N

The answer is D) 51 N

si = system international

Answer:

SI stands for International system of units

Explanation:

The SI system, is used around the world to remove bias and inequality of measured values. This made it possible to achieve unified measurements of quantities anywhere in the world by various conversion process. The seven basic SI units are:  kilogram (kg), meter (m), second (s), kelvin (K), ampere (A), mole (mol), and candela (cd).

Final answer:

The bottle will land in Carrie's lap because it maintains the same horizontal velocity as the car when tossed up, provided air resistance is ignored. The correct answer is A. The bottle will land in Carrie's lap.

Explanation:

If Carrie tosses the bottle straight up in the air above the convertible that is moving at 70 mph and air resistance is neglected, the correct answer is A. The bottle will land in Carrie's lap. This is because, according to Newton's laws, the bottle has the same horizontal velocity as the car when it is released.

Therefore, it will continue to move forward with the car at the same speed, assuming no air resistance is present to alter its path. If we were to consider air resistance, the path of the bottle could change and it might not land back in Carrie's lap.

This principle is illustrated in various physics problems, like those involving projectile motion where gravity is the only force acting on an object, and conservation of momentum in a frictionless environment.

Answer:

3

Explanation:

The half-life of a radioactive isotope is the time it takes for the mass of the sample to halve.

This can be rewritten as follows:

[tex]m(t) = m_0 (\frac{1}{2})^n[/tex]

where

m(t) is the mass of the sample at time t

m0 is the original mass of the sample

n is the number of half-lives that passed

We see that if we take n=3, the amount of original sample left is

[tex]m(t) = m_0 (\frac{1}{2})^3 = m_0 (\frac{1}{8})[/tex]

So 3 (3 half-lives) is the correct answer.

Answer:

the answer is 3

Explanation:

Answer:

Explanation:u=8m/s, a=8m/s*s, t=4s

Using v= u + at

v=8+-8*4

v=-24m/s

Displacement=s

Using s=½(u+v)t

s=½(8-24)4

s=½*-16*4

s=-8*4

s=32m( you can solve without observing the negative sign)

Answer:

60 kg.m/s

Explanation:

Momentum is the product of mass and velocity

p=m*v where m is mass in kg and v is velocity in m/s

Given that;

m=20kg and v=3m/s then;

p= 20×3= 60kgm/s

Answer:

60 kg * m/s east.

Explanation:

Momentum is a vector quantity, so you must include direction in the answer. Work by the guy above me ^_^

the magnitude of her total displacement in blocks is 3.

Answer:

3 blocks towards south        

Explanation:

Displacement is the shortest distance between the final position and initial position.

Initially mackinzie moves 4 blocks west, then 2 blocks south, the 4 blocks east and then 1 block south. Net displacement in East-west direction = 4 - 4 = 0.

In North South direction, net displacement = 2+1 = 3 blocks towards south

In a series circuit, all of the components are connected in the same 'loop' and the current only has one direction/path it can flow through.

In the first three options, the current has multiple paths it can go through. So these three circuits are parallel and not series.

In the last option, the current only has one path where it can flow through, so that circuit is in series.

So Circuit D is a series circuit.

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Answer

Circuit D

Answer:the last one

Explanation:in a series circuit, only one current flows through it. i.e it connected by a single wire

Answer:

true

Explanation:

you need to eliminate all unreal outcomes

Answer:

42 degrees, virtual image, same size as the object (26 cm)

Explanation:

The law of reflection states that:

- When a ray of light is incident on a flat surface (such as the plane mirror), the angle of reflection is equal to the angle of incidence

So, since in this case the angle of incidence is 42 degrees, the angle of reflection is also 42 degrees.

Moreover, the image formed by a plane mirror is always:

- Virtual (on the same side as the object)

- The same size as the object

So in this case, since the object's size is 26 cm, the image's size is also 26 cm.

42 degrees

virtual

26 cm

Answer:

A) direct sunlight striking Earth

Explanation:

The summer is caused by direct sunlight striking Earth.

Answer:

A) direct sunlight striking Earth

Explanation:

Think about why there are seasons.

Here is proof that my answer is correct:

Hello There!

There are 5,280 feet in 1 mile.

Have A Great Day!

Answer:

+5.7 m/s

Explanation:

According to the law of conservation of momentum is that the momentum before the collision is equal to the momentum after the collision. In an equation form it would look like this:

M₁V₁+M₂V₂ = M₁V₁'+M₂V₂'

Where:

M₁ = mass of object 1 (kg)

V₁ = velocity of object 1 before the collision (m/s)

V₁' = Final velocity of object 1 after the collision (m/s)

M₂ = mass of object 2 (kg)

V₂ = velocity of object 2 before the collision (m/s)

V₂' = Final velocity of object 2 after the collision (m/s)

According to your problem you have the following given:

M₁ = 5 g = 0.005kg

V₁ = 3 m/s

V₁' = -5m/s (It bounced off so it is going the other direction)

M₂ = 6g = 0.006kg

V₂ = -1 m/s (It is coming from the opposite direction of the 3-ball)

V₂' = ?

So we plug in what we know and solve for what we don't know.

[tex]M_1V_1+M_2V_2 = M_1V_1' + M_2V_2'\\\\(0.005kg)(3m/s)+(0.006kg)(-1m/s) = (0.005kg)(5m/s)+(0.006kg)(V_2')\\\\(0.015kg\cdot m/s)+(-0.006kg\cdot m/s)=(-0.025kg\cdot m/s)+(0.006kg)(V_2')\\\\0.009kg\cdot m/s+0.025kg\cdot m/s = (0.006kg)(V_2')\\\\\dfrac{0.034kg\cdot m/s}{0.006kg} = V_2'\\\\5.7m/s = V_2'[/tex]

Answer:

+5.7 m/s

Explanation:

Just did the assignment :)

Answer:

Two vectors not lying in the same line and pointing in different direction

C. Two-dimensional

Explanation:

One-Dimensional vectors will point in a single direction only. There magnitude will simply add up.

In case of opposite directions, both the vectors must be lying on a straight line. There magnitude will be subtracted from each other,

Two dimensional vectors are quantities with magnitude and direction and they are represented by two components, x and y.

So, vectors which are not in a straight line and point in different directions are called Two-dimensional vectors.

Answer: Trajectory=51m

Displacement=41m

Explanation:

Let's begin by stating clear that movement is the change of position of a body at a certain time. So, during this movement, the body will have a trajectory and a displacement, being both different:

The trajectory is the path followed by the body (is a scalar magnitude).  

The displacement is the distance in a straight line between the initial and final position (is a vector magnitude).  

According to this, in the description of the object placed at x= -7m on a number line and moving some 12m to the left and then to the right, stopping at x=34m; we are talking about the path followed by the object, hence its trajectory. So, 51 m is its trajectory.

But, if we talk about displacement, we have to draw a straight line between the initial position of the object (x=-7m) to its final position (x=+34m).

Now, being this an unidimensional problem, the displacement vector for this object is 41m.

Answer:

Option B is the right answer.

Answer:

The correct answer is C. at the equilibrium position.

Explanation: