A ball is dropped from 215m. How long will it take to reach the ground? Use 9.8
m/s^2 for g. Round answer to 2 places after the decimal

Answer:

"Changing the amplitude of a signal is straightforward: We just need to multiply each sample with some constant number. In the case of sine waves, if what we want is a wave with amplitude a, our wave function becomes y = a * Math.sin(x)."

Explanation:

Risk*

Kepler was able to find a relationship between the orbital periods and distances of the planets (his third law) by analyzing a dataset of planetary positions provided by Tycho Brahe. He concluded that all planets moved in elliptical orbits, with the sun at one focus of the ellipse. He also determined that the square of the orbital period of a planet is proportional to the cube of its average distance from the sun, which does not depend on the masses of the planets or the sun.

Johannes Kepler was able to discover a relationship between the orbital periods and distances of the planets that did not depend on the masses of the planets or the sun. This is known as Kepler's Third Law, and it is based on his observations and analysis of the data. Kepler was able to find this relationship by analyzing the observations of the planets' motion that had been made by Tycho Brahe. He discovered that the planets move around the sun in elliptical orbits rather than circular orbits, which was the prevailing theory at the time. Kepler also found that the planets move faster when they are closer to the sun and slower when they are farther away, which he called the Law of Areas. He discovered that the time it takes for a planet to orbit the sun (its period) is related to the distance between the planet and the sun (its semi-major axis) in a specific way. This relationship is expressed as P2 = a3, where P is the planet's period and a is its semi-major axis. This is known as Kepler's Third Law, and it is an important relationship that helps scientists understand the motion of the planets and other celestial bodies.

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Answer: The image formed by a plane mirror is always virtual (meaning that the light rays do not come from the image), upright and of the same shape and size as the object it is reflecting.

Answer: B. The angle when it leaves is the same as the angle when it hits

Explanation:

Apex

weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee true eeeeeeeeeeeeeeeeeeeee

Answer:

true

Explanation:

sorry if im wrong

To experimentally determine the volume of a floating irregularly shaped object, you can use the displacement method. Here is a step-by-step procedure are  Prepare a suitable container,   Measure the initial water level,Submerge the object,  Measure the final water level, Calculate the volume.

Here is a step-by-step procedure :

   Repeat for accuracy: To enhance accuracy, repeat the entire process multiple times. Take measurements for each trial and calculate the average volume to minimize any measurement errors or inconsistencies.By following the displacement method outlined above, you can determine the volume of an irregularly shaped object that floats based on the amount of water it displaces.

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The intensity of the electric current of a circuit is 123A and the electric charge is 1.7C to find the time interval in which the electric charge is transported.

Given that,

Current, I = 123 A

Electric charge, q = 1.7 C

To find,

The time interval in which the charge is transported.

Solution,

The electric current is given by electric charge per unit time. So,

\(I=\dfrac{q}{t}\\\\t=\dfrac{q}{I}\\\\t=\dfrac{1.7}{123}\\\\t=0.0138\ s\)

So, the required time is 0.0138 seconds.

Explanation:

→ Volume of cone = πr² × h/3

Here,

→ Volume of cone = π(13)² × 27/3 cm³

→ Volume of cone = 169π × 9 cm³

→ Volume of cone = 1521π cm³

→ Volume of cone = 1521 × 22/7 cm³

→ Volume of cone = 33462/7 cm³

→ Volume of cone = 4780.28 cm³

Answer:

4,778.4 is correct

Explanation:

The correct answer is centripetal force keeps electrons in orbit around the nucleus.

What is Rutherford model?

Rutherford Atomic Model - J. J. Thomson's "plum pudding" model was unable to account for some experimental findings related to the atomic structure of elements. British scientist Ernest Rutherford carried out an experiment, and using the results of this experiment, he proposed Rutherford's Atomic Model and explained the atomic structure of the elements.

Thus, in the Rutherford model, the centripetal force that maintains the electron in orbit is produced by the electrostatic attraction between the (positive) nucleus and the (negative) electron.

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Answer:

They hit the ground at the same time

Explanation:

If you ignore air friction, the acceleration of gravity is the same on both of the balls.

Answer:

blue

Explanation:

blue is the only color being reflected, meaning it's the only one that will be visible

Answer:

The planet's mass and size determine the gravity of a planet

Explanation:

The smaller and less mass a planet has, the less gravitational pull it has on things and vice versa. The same can be applied with all living things, we all have an extremely small gravitational pull.

An age structure diagram shows that the younger age groups contain many more individuals than the oldest age groups this indicate the rapid growth about the future of this population

Age structure statistics make it possible to link the pace of growth (or fall) with the degree of economic development of a population. A nation with rapid population growth, for instance, has a triangle-shaped age structure with a higher percentage of younger people who are in or near reproductive age. The proportion of persons in each age group within a population during a specified period of time is referred to as the age structure of that population. It is a typical trait of a population in a nation or area. A population's migration, birth rate, and mortality rate are all intimately correlated with its age structure.

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Answer: The distance traveled by the car once around the racetrack = 100 meters.

Explanation:

Given: The length of the track = 100 meters

Then, the distance traveled by the car around the racetrack = Length of the track = 100 meters.

Hence, the distance traveled by the car once around the racetrack = 100 meters

Therefore, the tension in the string at the 56-cm mark is T2 = -0.56T1 = -1.46 N (downward)

We can solve this problem using the principle of torque equilibrium. Since the meter stick is in equilibrium, the net torque acting on it must be zero. We can choose any point as the pivot point and write the torque equation about that point. Let's choose the pivot point at the 20-cm mark. Then the torque due to the weight of the meter stick about this point is:

τ1 = (1.15 N)(0.2 m)sin(90°) = 0

here we have assumed that the weight of the meter stick acts at its center of mass.

The tension in the string at the 56-cm mark exerts a clockwise torque about the pivot point, while the tension in the string at the 20-cm mark exerts a counterclockwise torque. Let T1 be the tension in the string at the 20-cm mark and T2 be the tension in the string at the 56-cm mark. Then the torques due to these tensions are:

τ2 = T1(0.2 m)sin(90°) = 0.2T1

τ3 = T2(0.36 m)sin(90°) = 0.36T2

here we have used the fact that the angles between the strings and the meter stick are both 90°.

Since the net torque is zero, we have:

τ1 + τ2 + τ3 = 0

or:

0 + 0.2T1 + 0.36T2 = 0

Solving for T2, we get:

T2 = -(0.2/0.36)T1 = -0.56T1

Since the tensions in the strings are both positive (upward), we can take the magnitudes of the tensions and write:

T1 + T2 = 1.15 N

Substituting the expression for T2, we get:

T1 - 0.56T1 = 1.15 N

0.44T1 = 1.15 N

T1 = 2.61 N

Therefore, the tension in the string at the 56-cm mark is:

T2 = -0.56T1 = -1.46 N (downward)

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1) Experiment to find the density of the wood block without using a weighing scale:

a) Fill the pyrex beaker with a known volume of water.

b) Measure and record the initial water level in the beaker.

c) Carefully lower the wood block into the water, ensuring it is fully submerged.

d) Measure and record the new water level in the beaker.

e) Calculate the volume of the wood block by subtracting the initial water level from the final water level.

f) Divide the mass of the wood block (obtained from the second experiment) by the volume calculated in step e to determine the density of the wood block.

2) Experiment to measure the density of the wood block using a weighing scale:

a) Weigh the wood block using a weighing scale and record its mass.

b) Fill the pyrex beaker with a known volume of water.

c) Measure and record the initial water level in the beaker.

d) Carefully lower the wood block into the water, ensuring it is fully submerged.

e) Measure and record the new water level in the beaker.

f) Calculate the volume of the wood block by subtracting the initial water level from the final water level.

g) Divide the mass of the wood block by the volume calculated in step f to determine the density of the wood block.

Comparing the results from both experiments will provide insights into the porosity of the wood block. If the density calculated in the first experiment is lower than in the second experiment, it suggests that the wood block is porous and some of the water has been absorbed.

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Answer:

Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below

Always use the upper case for the first character in the element name and the lower case for the second character.

To enter an electron into a chemical equation use {-} or e

To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}. Example: Fe{3+} + I{-} =...

Substitute immutable groups in chemical compounds to avoid ambiguity. For instance equation C6H5C2H5 + O2 = C6H5OH + CO2...

Explanation:

Answer:

7 Seconds

Explanation:

P=W/t

t=W/P

t=875,000/125,000

t=7 seconds

When the absorption spectrum of light from distant galaxies is measured it is found that lines in absorption spectrum are shifted towards the red end of  spectrum.

What is Absorption Spectrum ?

The Absorption Spectrum is constituted by the frequencies of light transmitted with dark bands when electrons absorb energy in ground state to reach higher energy states. Absorption Spectrum is produced when atoms absorb energy .

The Absorption Spectroscopic technique that is used for measuring the absorption of radiation as it interacts with sample.

So , we conclude that , after measurement of absorption spectrum of light it is found that the lines in absorption spectrum are shifted towards the red end of  spectrum.

Therefore , the result after measurement of absorption spectrum of light from distant galaxies is explained above .

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If heavier cars were used, the barricade would need to be designed to absorb more kinetic energy. In order to design a barricade that can absorb more kinetic energy from heavier cars, the design of the barricade must be modified. The key to designing a barricade that can absorb more kinetic energy is to use a material that can do so.

In addition, the barricade would need to be designed in such a way that it would be able to absorb as much kinetic energy as possible. One way to do this is to make the barricade thicker and heavier. This would increase its mass, which would increase the amount of kinetic energy that it could absorb. The design of the barricade would also need to take into account the work that would be required to stop the car.

The work required to stop a car is directly proportional to the kinetic energy of the car. Therefore, in order to stop a heavier car, more work would need to be done. In order to minimize the work required to stop the car, the barricade would need to be designed in such a way that it can absorb the kinetic energy of the car with minimal work.

This could be achieved by using materials that are able to absorb large amounts of energy without breaking or deforming too much. By using such materials, the barricade would be able to absorb more energy with less work.

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Well we know the hypotenuse of the triangle which is 253 m. And we know the angle of the triangle which is 55.8 degrees. So we want to find y. And to find y we use sin. And sin is a ratio, the ratio of the opposite leg, and hypotenuse. So sin(55.8) = y/253. Now we solve for y by multiplying both sides by 253. And finally we get 209.25 as the length of the y component.

Motion occurs when there is a change in an object's position with respect to a reference point. This change can be caused by upsetting the equilibrium of the body, such as by applying a force to it or by changing its weight distribution.

Rotary motion occurs when an object rotates around an axis of rotation, while linear motion involves the transfer of motion to outside forces. Therefore, all of these conditions are necessary for motion to occur, whether it is in a straight line or in a circular path. Understanding the conditions for motion is essential in physics and engineering, where it is necessary to study how objects move and how to control their motion to achieve specific goals.
To have motion, all of the answers are correct (option d). This means that for an object to have motion:

a. The equilibrium of the body must be upset: When a force is applied to an object in equilibrium, it will disrupt the balance and cause the object to move.

b. Rotary motion must occur around the axis of rotation: In order for an object to have rotational motion, it must rotate around a specific axis.

c. Linear motion must be transferred to outside forces: When an object experiences linear motion, the forces acting upon it must be transferred to other objects or systems for the motion to occur.

In summary, motion can be achieved by upsetting the equilibrium of the body, having rotary motion around an axis of rotation, and transferring linear motion to outside forces.

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As a Haitian taptap driver, if you want a more comfortable ride and decide to replace the springs with new ones that can handle the typical heavy load on your vehicle, you would want the spring constant of your new spring system to be slightly larger than the spring constant of the old springs.

Here's why:

1. Spring constant: The spring constant determines the stiffness of the spring and how much it resists compression or stretching. A higher spring constant means a stiffer spring, while a lower spring constant means a softer spring.

2. Comfortable ride: To have a more comfortable ride, you would want the new springs to absorb more of the shocks and bumps on the road. This can be achieved by having a slightly larger spring constant for the new springs compared to the old ones.

3. Heavy load: Since you mentioned that the new springs should be able to handle the typical heavy load on your vehicle, it means that the new springs should be able to support the weight of the vehicle and passengers without compressing too much.

4. Balance: It's important to find a balance between comfort and support. If the spring constant is substantially larger than the old springs, the ride might become too stiff and uncomfortable. On the other hand, if the spring constant is substantially smaller, the springs may compress too much under the heavy load, affecting stability and safety.

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The deceleration (in m/s2) of a rocket sled if it comes to rest in 1.9 s from a speed of 1100 km/h is -160.3 m/s².The initial velocity of the rocket sled is 1100 km/h. It comes to rest in 1.9 seconds.

The deceleration caused by such deceleration caused one test subject to black out and have temporary blindness.

We need to find the deceleration (in m/s2) of a rocket sled.

We can use the formula given below to calculate the deceleration of a rocket sled.acceleration (a) = (final velocity (v) - initial velocity (u)) / time (t).

To use the above formula we need to convert km/h into m/s acceleration (a) = (final velocity (v) - initial velocity (u)) / time (t)Where initial velocity (u) = 1100 km/h Final velocity (v) = 0 km/h Time (t) = 1.9 seconds.

We know that,1 kilometer = 1000 meters.

So, we have to multiply 1000 with 1 hour and divide by 3600 to convert km/h into m/s.1100 km/h = 1100 x 1000 / 3600= 305.56 m/s.

Now, we will substitute the values in the formula and solve it.acceleration (a) = (final velocity (v) - initial velocity (u)) / time (t) = (0 - 305.56) / 1.9= -160.3 m/s².

The deceleration (in m/s2) of a rocket sled if it comes to rest in 1.9 s from a speed of 1100 km/h is -160.3 m/s².

The negative sign represents that deceleration is in the opposite direction of motion i.e., it's slowing down.

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The answer to this question is option B. The orbits of most asteroids cross the orbit of Mars.

Asteroids are a group of small, rocky bodies that circle the sun. They can be thought of as miniature planets or as debris left over from the formation of the solar system. These space rocks are typically made of rock, metal, or a combination of the two, and range in size from a few meters to hundreds of kilometers across. Most asteroids orbit the sun in a region between Mars and Jupiter, called the asteroid belt. Their orbits cross the orbit of Mars, making the choice (B) correct.

The asteroid belt is about 2.2 to 3.2 astronomical units (AU) from the sun, where 1 AU is the average distance between Earth and the sun. The orbits of a few asteroids cross the orbit of Earth, but most asteroids are concentrated in the asteroid belt, between Mars and Jupiter. The answer to this question is option B.

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Statement is True. When energy is converted from one form to another, a small amount of energy is inevitably lost due to various factors such as friction, heat dissipation, and inefficiencies in the conversion process. This phenomenon is known as energy loss or energy dissipation.

According to the law of conservation of energy, energy cannot be created or destroyed, but it can be transformed from one form to another. However, in practical situations, energy conversions are never 100% efficient, and some energy is always lost in the process. This loss occurs mainly in the form of heat.

The exact calculation of energy loss depends on the specific system and conversion process involved. For example, if electrical energy is converted into mechanical energy using an electric motor, the efficiency of the motor determines the amount of energy lost. Efficiency is usually expressed as a percentage, indicating the ratio of useful output energy to the input energy. The energy lost can then be calculated by subtracting the output energy from the input energy.

In summary, when energy is converted from one form to another, a small amount of energy is inevitably lost due to various factors. This loss is a result of real-world inefficiencies in the conversion process, such as friction and heat dissipation. Therefore, it is important to consider energy losses when designing systems or evaluating the overall efficiency of energy conversion processes.

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Answer:

Potential Energy

Explanation:

The force exerted by the elevator on the man is 0N if a man weight is 800N.

We know very well for an elevator which is rising upward,its acceleration is given by the formula,

Net acceleration=g+a where g is the acceleration due to gravity and a is acceleration of elevator.

We know that g= 9.8m/sec² if we assume downward direction as positive direction, now we have given that value of a=-9.8m/sec².

Net acceleration is = 9.8 + (-9.8)=0m/sec²

Now, we know that according to newton second law of motion -. The acceleration of the body is straightforwardly relative to the net power following up on the body and conversely corresponding to the mass of the body. This really intends that as the power following up on an article is expanded, the speed increase of the item is expanded.

In other words,we have F=ma

where m is the mass of the body and a is the acceleration of the body.

We have a=0

So,F=m×0

=>F=0N

Hence, exerted force is 0N.

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Root means square speed of nitrogen is 345.24 m/s.

The Kinetic Molecular Theory postulates that gaseous particles are in a state of continuous random motion, whereby they move at varying speeds while reversing directions and colliding with one another. We consider both speed and direction when using velocity to describe the motion of gas particles.

The distribution of velocities remains constant even though the velocity of gaseous particles changes constantly. Since we are unable to determine each particle's velocity individually, we frequently make decisions using the behavior of the particles as a whole. The velocities of particles traveling in opposing directions have opposite signs.

root mean square speed of hydrogen = 1055 m/s

root mean square speed of nitrogen = ?

Vrms = ( 3RT/M) ^ (1/2)

where,

Vrms = root mean square speed

R = Universal gas constant

M = molar mass

T = temperature

for hydrogen ,

1055 = ( 3 RT / M ) ^( 1/2)

= > 1055 =  ( 8.3145 x 3 x T / 0.01) ^(1/2)

= > 1055 ^2 = 8.3145 x 3x T / 0.01

= > 1338 K = T

for nitrogen,

Vrms = ( 3 x 8.3145 x 1338 / 0.28)^ (1/2)  =  345.24 m/s

Therefore, root means square speed of nitrogen is 345.24 m/s.

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A) The frequency of the electric field in an electromagnetic wave is the same as the frequency of the magnetic field. Therefore, the frequency of the electric field is 95.0 kHz.

B) To find the rms strength of the electric field (E), we use the relationship between the electric and magnetic fields in free space: E = cB, where c is the speed of light (3.00 × 10^8 m/s) and B is the rms strength of the magnetic field.

E = (3.00 × 10^8 m/s)(7.35 × 10^-9 T) = 2.21 × 10^-1 V/m

C) In an electromagnetic wave, the electric field oscillates perpendicular to both the magnetic field and the direction of propagation. Since the magnetic field oscillates vertically (up and down) and the wave is traveling west, the electric field must oscillate along the horizontal north-south line.

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The frequency of the electric field is also 95.0 kHz. The RMS strength of the electric field is also 7.35×10−9T. The direction of its oscillation is along the horizontal north-south line.

A) The frequency of the electric field in an EM wave is the same as the frequency of the magnetic field. Therefore, the frequency of the electric field is 95.0 kHz.

B) To find the rms strength of the electric field, we can use the formula: E_rms = B_rms * c, where E_rms is the electric field strength, B_rms is the magnetic field strength (7.35×10−9 T), and c is the speed of light in free space (3.00×10^8 m/s).

E_rms = (7.35×10^(-9) T) * (3.00×10^8 m/s) = 2.21×10^(-1) V/m

C) For the direction of oscillation of the electric field, we use the right-hand rule. With the thumb pointing in the direction of the EM wave (west), and the fingers pointing in the direction of the B field oscillation (up and down vertically), the palm of the hand will show the direction of the electric field oscillation. In this case, it oscillates along the horizontal north-south line.

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