A stunt car traveling at 20 m/s flies horizontally off a cliff and lands 39.2 m from the base of the cliff. How tall is the cliff?

Convection is  mode of heat transfer in liquids. Thus thermal energy is transferred by convection currents and option b is correct.

There are three modes of heat transfer, namely conduction, convection and radiation. The conduction is the heat transfer mode in solids where the closely packed molecules passes heat energy from one end to the other in the chain of molecules.

Convection is the heat transfer mode in liquids where, the hot molecules from the bottom will travels to the surface make the molecules in the way gains thermal energy as we see in boiling.

Radiation is the heat transfer mode in gases and by which light and heat energy transfers from space to earth's surface.  The thermal energy gained by the liquid molecules make moving and transferring the energy to other molecules leads to convection current.

To learn more on convection, refer here:

https://brainly.com/question/16635311

#SPJ6

sorry, it's B, not a made a mistake in the approximation

Answer:

65 miles per hour

Explanation:

Speed= Distance/Time

Following this formula, we just need to insert the values.

The distance is 125 miles and the time is 2 hours

125=2=65

65 miles per hour

The speed of the car was exactly 125 mi per 2 hours.

In a more familiar unit,  125mi/2hr = 62.5 mi/hr.

The coefficient of kinetic friction between the chair and the waxed floor, does she just reach the glass without knocking it over is,

\(\mu_k\)= Coefficient of kinetic friction = 0.102

The friction coefficient is the ratio of the normal force pressing two surfaces together to the frictional force preventing motion between the two surfaces.

Greek letter mu (μ) is typically used to represent it. In mathematics, is equal to F/N, where F is the frictional force and N is the normal force.

The coefficient of friction is dimensionless because both F and N are expressed in units of force (such as newtons or pounds).

For both static and kinetic friction, the coefficient of friction has different values. When an object experiences static friction, the frictional force resists any applied force, and the object stays at rest until the static frictional force is removed.

Using Energy conservation:

KEi + PEi + Wf = KEf + PEf

KEi = 0, since initially Albertine was at rest

KEf = 0, since finally Albertine need to be at rest to just reach the glass

PEi = (1/2)*k*x^2 = Initial Potential energy due to compression of spring

PEf = 0 (since at final position compression in spring is zero)

Wf = Work-done by friction = Ff×d = -μκ*m*g*d

So,

0 + (1/2)*k*x^2 -\(\mu_k\)*m*g*d = 0 + 0

\(\mu_k\)= k*x^2/(2*m*g*d)

Using given values:

\(\mu_k\) = 95.0*5.00^2/(2*60.0*9.80*19.8)

\(\mu_k\)= Coefficient of kinetic friction = 0.102

Learn more about kinetic friction

https://brainly.com/question/29100737

#SPJ4

Answer: sound waves travel faster in solid than water or air.

In vacuum sound waves don't travel at all

Answer:

A: Sound travels faster through air

Explanation:

The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C, the speed of sound in air is about 343 metres per second, or a kilometre in 2.9 s or a mile in 4.7 s.

Cool down the Slowest

B. Seawater, because it heats up slower and gives away heat slower than sand.

Read the question wrong the first time

Answer: b

Explanation:

The heat released in the whole process in which a sample of water is cooled and frozen is 4.64 * 10⁸ J.

The problem is to be divided into two steps. This process releases a certain quantity of heat,

Step 1) Solidification of the water at 0°C into ice.

Q = m* Lf

where,

m is the mass of the water

Lf stands for the latent heat of ice fusion

Substituting numbers, we find

Q₁ = (1271 kg)* (334 kJ/kg) = 424514 kJ = 4.2* 10⁸ J

step 2) The water became ice, now we need to cool it down to -36°C . This process releases a certain quantity of heat, which is

Q₂ = m* Cs* ΔT

where,

m is the mass of ice

Cs is the specific heat of ice

ΔT is the variation of temperature

By placing the numbers in the formula, we have,

Q₂ = (1271 kg)* (2050 J/kg K) (-17-0) = 44294350 J = - 0.44 * 10⁸ J

The negative sign means the heat is released by the system.

Thus, the overall process produces heat that is

Q = Q₁ + Q₂ = 4.2* 10⁸ J + 0.44 * 10⁸ J = 4.64 * 10⁸ J

To know more about heat:

https://brainly.com/question/9833287

#SPJ4

Frequency = (speed) / (wavelength)

Frequency = (1540 m/s) / (7.52 x 10⁻⁵ m)

Frequency = 20.48 MHz

That frequency is more than 1,000 times higher than anything our ears can hear.  That's why it's called "Ultra-sond".

A frequency of 20.48 MHz (megahertz) is required to create a sound wave with a wavelength of 7.52 x 10^-5 m in human tissue.

A sound wave is a  mechanical wave that is created by the vibration of an object in a medium, such as air or water. When an object vibrates, it creates pressure waves that travel through the medium in all directions. The vibrations in the medium cause the pressure and density to fluctuate, creating a disturbance that our ears detect as sound.

There are two main types of sound waves:

Longitudinal waves: In a longitudinal wave, the particles of the medium vibrate parallel to the direction of the wave. This means that the compressions (where the particles are closer together) and rarefactions (where the particles are farther apart) move in the same direction as the wave. Sound waves in air are longitudinal waves.

Transverse waves: In a transverse wave, the particles of the medium vibrate perpendicular to the direction of the wave. This means that the crests (highest points) and troughs (lowest points) move up and down, while the wave itself moves from left to right. Transverse waves are found in solids, such as a guitar string, but not in fluids like air or water.

Here in the question,

The formula to calculate the speed of sound is:

speed of sound = frequency x wavelength

We are given the speed of sound in human tissue, which is 1540 m/s, and the wavelength of the sound wave, which is 7.52 x 10^-5 m. We can rearrange the formula to solve for frequency:

frequency = speed of sound/wavelength

Substituting the given values, we get:

frequency = 1540 m/s / (7.52 x 10^-5 m)

frequency = 20.48 x 10^6 Hz

Therefore, a frequency of 20.48 MHz (megahertz) is required to create a sound wave with a wavelength of 7.52 x 10^-5 m in human tissue.

To learn about the amplitude of a wave click:

brainly.com/question/29775285

#SPJ3

The subject depicted in the attached image is Astronomy and Astrophysics.

Astronomy is the scientific study of celestial objects such as stars, planets, galaxies, and other phenomena that exist outside of Earth's atmosphere.

Astronomers use a variety of methods to observe and study these objects, including telescopes, spacecraft, and computer simulations.

Astronomy is a broad field that includes many different sub-disciplines, such as astrophysics, planetary science, and cosmology.

Astronomers study the physical properties and behavior of celestial objects, such as their composition, temperature, motion, and evolution.

They also seek to understand the structure and history of the universe as a whole.

Learn more about astronomy here:

https://brainly.com/question/1141458

#SPJ1

the missing word is clockwise moment. I hope this helps good luck

Momentum of the truck will be 70000 kg-m/s

Momentum can be defined as the impulse gained by a moving object.

Mass of the truck = m = 2000 kg

Velocity of the truck = v = 35 m/s

Momentum = M = m * v

M = 2000 * 35

M = 70000 kg-m/s

To know more about Momentum,

https://brainly.com/question/18558072

#SPJ4

Answer:

2/3V

Explanation:

Given that a ball of mass M and speed V collides with another ball of mass 2M and velocity v/2 . After collision they stick together and we need to find their speed after collision . According to Law of Conservation of Momentum , The total momentum of the system before and after collision is constant .That is ;

\(\sf\qquad\longrightarrow m_1u_1+m_2u_2=m_1v_1+m_2v_2\\ \)

\(\sf\qquad\longrightarrow MV + 2M\bigg(\dfrac{V}{2}\bigg) = (2M + M)(v)\\ \)

\(\sf\qquad\longrightarrow MV +MV= 3Mv\\\)

\(\sf\qquad\longrightarrow 2MV = 3Mv\\ \)

\(\sf\qquad\longrightarrow v =\dfrac{2M}{3M}V\\ \)

\(\sf\qquad\longrightarrow \pink{ v_{after\ collision}=\dfrac{2}{3}V }\)

Hence the velocity after the collision ia 2/3V .

Answer:

False

Explanation:

The speed of particle 1 with respect to particle 2 which is moving perpendicular to each other at 2.83 s is 20.89 m / s

a = v / t

v = x / t

\(a_{1}\) = 3.37 m / s²

\(a_{2}\) = 5.18 m / s²

t = 2.83 s

\(v_{1}\) = \(a_{1}\) * t

\(v_{1}\) = 3.37 * 2.83

\(v_{1}\) = d\(x_{1}\) / dt = 9.54 m / s

\(v_{2}\) = \(a_{2}\) * t

\(v_{2}\) = 5.18 * 2.83

\(v_{2}\) = d\(x_{2}\) / dt = 14.66 m / s

\(x_{1}\) = \(v_{1}\) * t

\(x_{1}\) = 9.54 * 2.83

\(x_{1}\) = 27 m

\(x_{2}\) = \(v_{2}\) * t

\(x_{2}\) = 14.66 * 2.83

\(x_{2}\) = 41.49 m

Since they are moving perpendicular to each other, they make a right angled triangle. According to Pythagoras theorem,

\(x_{3} ^{2}\) = \(x_{1} ^{2}\) + \(x_{2} ^{2}\)

On differentiating with respect to t,

2\(x_{3}\) d\(x_{3}\) / dt = 2\(x_{1}\) d\(x_{1}\) / dt + 2\(x_{2}\) d\(x_{2}\) / dt

41.49 ( d\(x_{3}\) / dt ) = 27 ( 9.57 ) + 41.49 ( 14.66 )

d\(x_{3}\) / dt = ( 258.4 + 608.24 ) / 41.49

d\(x_{3}\) / dt = \(v_{12}\) = 20.89 m / s

Therefore, the speed of particle 1 with respect to particle 2 at 2.83 s is 20.89 m / s

To know more about relative velocity

https://brainly.com/question/17228388

#SPJ1

Answer:

B. 1.29 x 10^5

Answer:

B. 1.29 x 10^5

Explanation:

just took the test on ed2020

Answer:

As mass increases, the acceleration of an object decreases because more force is required.

Explanation:

The question states that the student made a mass acceleration graph with the force being constant, if you think about this in everyday life, would pushing a 30 kg box be easier than that of a 15 kg box? Obviously not because if you have the same force for both of them the 15 kg box would have a greater acceleration than the 30 kg one (assuming they are on the same surfaces and the same amount of force is applied.)

Therefore we can say that as the mass of an object increases the acceleration must decrease because we need more force to push the object.

The skater's final angular velocity is approximately 9.86 rad/s.

The skater's final angular velocity can be calculated using the principle of conservation of angular momentum. The equation for angular momentum is given by:

L = Iω

where L is the angular momentum, I is the moment of inertia, and ω is the angular velocity.

Initially, the skater has an angular momentum of:

L_initial = I_initial * ω_initial

Substituting the given values:

L_initial = 2.12 kg m² * 3.25 rad/s

The skater's final angular momentum remains the same, as angular momentum is conserved:

L_final = L_initial

The final moment of inertia is given as 0.699 kg m². Therefore, the final angular velocity can be calculated as:

L_final = I_final * ω_final

0.699 kg m² * ω_final = 2.12 kg m² * 3.25 rad/s

Solving for ω_final:

ω_final = (2.12 kg m² * 3.25 rad/s) / 0.699 kg m²

Hence, the skater's final angular velocity is approximately 9.86 rad/s.

For more such questions on angular velocity, click on:

https://brainly.com/question/29566139

#SPJ8

Answer:

Hope it helped

stay safe, mark BRAINLIEST

The speed of the cart after 3 seconds of Low fan speed is (2) cm/s. This is further explained below.

Generally, speed is simply defined as the rapidity of movement or efficiency of operation.

In conclusion, After 8 seconds with the fan set at Low, the cart will have traveled 1 cm/s. After three seconds at medium fan speed, the cart travels at a velocity of two centimeters per second.

Read more about Speed

https://brainly.com/question/4931057

#SPJ1

Answer:

2 Ohms

Explanation:

To calculate the effective resistance of the circuit, we will start with R3 and R5. This resistance are in series, so we can calculate an effective resistance R7 of these two as follows

R7 = R3 + R5

R7 = 5 Ohms + 5 Ohms

R7 = 10 Ohms.

Then, R7 and R4 are in parallel, so the effective resistance of these two is R8 equal t

Now, R8 and R2 are in series, so the effective resistance is

R9 = R8 + R2

R9 = 10/3 Ohms + 5 Ohms

R9 = 25/3 Ohms

Finally, R9, R1, and R6 are in parallel, so the effective resistance of the circuit is

Therefore, the effective resistance to the nearest whole number is 2 Ohms

Answer:

Explanation:

Semiconductors are found in the p-block of the periodic table as they usually have 4 valence electrons.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

Learn more about periodic table,here:

https://brainly.com/question/11155928

#SPJ2

Answer:

The wavelength is  \(\lambda = 886 \ nm\)

Explanation:

From the question we are told that

   The  energy band gap is  \(E = 1.4 eV\)

Generally the energy of  a single photon of light emitted for an electron jump in a GaAS solar cell is mathematically represented as

      \(E = \frac{hc}{\lambda }\)

Where  h is the Planck's  constant with values

     \(h = 4.1357 * 10^{-15} eV\)

and  c is  the speed of light with values  \(c = 3*10^{8} \ m/s\)

So  

     \(\lambda = \frac{hc}{E}\)

substituting values

    \(\lambda = \frac{4.1357 *10^{-15} * 3.0 *10^{8}}{1.4}\)

  \(\lambda = 886 \ nm\)

Answer:

New acceleration = 1.5 m/s²

Explanation:

The acceleration of an object when it moves in a circular path is given by :

\(a=\dfrac{v^2}{r}\)

Where

v is speed of an object

r is radius of path

If v remains constant,

\(a\propto \dfrac{1}{r}\)

or

\(\dfrac{a_1}{a_2}=\dfrac{r_2}{r_1}\)

Put r₁ = 5 m, a₁ = 3m/s², r₂ = 10 m

\(a_2=\dfrac{a_1r_1}{r_2}\\\\a_2=\dfrac{3\times 5}{10}\\\\a_2=1.5\ m/s^2\)

Hence, if the radius of its path is increased to 10 m, its acceleration will be 1.5 m/s².

Answer:

protons: 6

electrons: 6

neutrons: 8

Explanation:

atomic number -> number of protons -> 6

mass number -> number of protons + number of neutrons

    so 14-6 = 8. 8 neutrons

this atom is neutral (net charge is 0), so the number of electrons is the same as the number of protons, which is 6

Explanation:

Although the iceberg has less internal energy per mass, its enormously greater mass gives it a greater total energy than that in the small cup of coffee

Answer:

The hot coffee has a higher temperature, but not a greater internal energy. Although the iceberg has less internal energy per mass, its enormously greater mass gives it a greater total energy than that in the small cup of coffee.

Explanation:

Answer:

Newton's theory identified mass as the factor that causes gravity. On the other hand, Einstein's theory identified the curvature of space-time as the factor that causes gravity.

Answer:

Hey mate...

Explanation:

This is ur answer....

In the 17th century Newton concluded that objects fall because they are pulled by Earth's gravity. Einstein's interpretation was that these objects do not fall. According to Einstein, these objects and Earth just freely move in a curved spacetime and this curvature is induced by mass and energy of these objects.

Hope it helps you,

mark me as the brainliest.....

Pls answer my 2 recent questions by going on my account...

Follow me!

Answer:

Options B

Explanation:

The appropriate quantitative research method for understanding political views held by the young population of a specific area is written surveys (option b). Surveys allow for the collection of data from a large number of participants, and specific questions can be asked to gather data on political views.

Participant observation (option a) involves direct observation of individuals in a natural setting, which may not be practical for studying political views.

Secondary data analysis (option c) involves analyzing data that has already been collected, and may not be specific to the young population or the area of interest.

Laboratory experiments (option d) are typically used to study cause-and-effect relationships between variables, which may not be applicable to studying political views.

Therefore, the best option for understanding the political views held by the young population of a specific area is written surveys.

To understand the political views of the young population of a specific area, a researcher can use written surveys, participant observation, and secondary data analysis as quantitative research methods.

If a researcher is trying to understand the political views held by the young population of a specific area, they should use written surveys, participant observation, and secondary data analysis as quantitative research methods.

https://brainly.com/question/33505242

#SPJ2

Given data:

* The speed of the water coming out of the pipe is,

* The diameter of the left side of pipe is,

* The diameter of the right side of the pipe is,

Solution:

(a). The area of the right side of pipe is,

The radius of the right side of pipe is,

Thus, the area of the right side of pipe is,

The volume of the water coming out from the right side of the pipe is,

Where t is the time taken, v_1 is the velocity of the water, and A_1 is the area of right side of pipe,

Substituting the known values,

Thus, the volume of water flows into the atmosphere is 1.97 meter cube.