A stone dropped from the top of a building reaches the ground with a velocity of 49ms¹. If the acceleration due to gravity is 9.8ms², calculate the time for which the stone is falling freely. [Answer: 5s]​

Answer: absorb

Explanation: ligh goes in ur eyes

Answer:

An object's velocity will only remain constant in the absence of any forces or if the forces ... The pendulum doesn't move because all the forces cancel each other out (add ... Note that an object that has a mass of one kilogram on earth would have a ... frames of animation

Explanation:

ANSWER:

B. mechanical

STEP-BY-STEP EXPLANATION:

Sound or sonic waves are a mechanical waves created by a vibrating object.

So the correct answer is B. mechanical

Answer:

Its also know as atomic mass its the mass of isotopes.

Explanation:

relative atomic masses of sources in the local environment of the Earth's crust and atmosphere as determined by the atomic weight.

Answer:

The information shows the masses after the compounds are balanced.

2MgO + 2Cl2 → 2MgCl2 + O2

85g + 156g → 188g + 53g

53gas total mass in reactant is equal to product.

A.

53g of O2, because all mass must be conserved.

Answer:The disturbance created by a source of sound in the medium travels through the medium and not the particles of the medium

Explanation:i hope this is right

Answer:

A Bow wave is produced when a speed boat moves faster than the waves it produces.

Explanation: A Bow wave is a progressive disturbance that propagates through a fluid, such as water or air, as a result of a displacement of the anterior point of an object passing through the fluid that is greater than the speed of the wave travelling across the fluid, produced by the same object. If the speed of the object is slower than the waves it produces, then no Bow waves will be generated. In the above scenario, when the speed boat moves faster than the waves it generates, it produces the Bow wave in the water.

The potential energy of a rocket increases when its escapes from the influence of the earth. It increases when it escapes the earth's boundary.

Escape velocity or escape speed is the minimum speed required for a free, non-propelled object to escape from the gravitational pull of the main body and reach an infinite distance from it in celestial physics.

It is commonly expressed as an ideal speed, neglecting atmospheric friction.

If a spacecraft is launched from the moon at the escape speed of the earth then the value of escape speed will be the difference in both the velocities.

An object's height above the zero position directly relates to its gravitational potential energy.

The kinetic energy of motion is converted into gravitational potential power as your rocket ascends.

The rocket possesses gravitational potential energy as it climbs because it is becoming farther away from the Earth's surface, much as a positive and negative charge moving apart.

The potential energy of a rocket increases when its escapes from the influence of the earth. It increases when it escapes the earth's boundary.

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Answer:

Social media has helped many businesses grow and promote itself, and has helped people find a better way to connect and communicate with one another. On the other hand, it's also provided many people with problems involving mental health, emotional insecurities, and waste of time

Explanation:

what they said is correct

Answer: C

Explanation: I just finished the test on A P E X :)

Planets A and B have the same mass, but planet A is half the size of planet B, hence you would weigh more on planet A because the distance between you and the planet's center of gravity would be smaller, so option C is correct.

A fundamental characteristic of an object, its inertia is quantified by its mass, which is a basic indicator of the volume of substance inside the thing. Because mass is such a fundamental quantity and is difficult to define in terms of another, definitions of it frequently appear circular.

It is possible to define every mechanical quantity in terms of mass, length, and time. The SI unit for mass, denoted by the letter m, is the kilogram. While mass is typically thought of as an immutable feature of an item, relativistic mass must be taken into account when traveling at speeds close to the speed of light.

Therefore, You would weigh more on planet A because the distance between you and the planet's center of gravity would be smaller.

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Answer:

both magnesium and strontium have 2 valence electrons

Explanation:

potassium has 8 valence electrons, and nitrogen has 5.

Answer:

vector quantity............

Explanation:

Mark me braimlist

Answer:

scalar

Explanation:

Since the box is pulled upward,  work done by gravity is negative, so the answer is (A) -140 J.

Force by which any planet or other body draws objects toward its center is called as gravity.

As ΔPE = mgh

ΔPE is the change in potential energy, m is mass of the box, g is acceleration due to gravity, and h is change in height.

Given : h = 6.0 m sin 37° = 3.6 m

Given, 37° is the angle of the ramp.

As F = ma

F is the force applied to the box (30 N) and a is the acceleration of the box along the ramp. The component of the gravitational force parallel to the ramp is : Fg|| = mg sin θ

θ is the angle of ramp, and is equal to 37° in this case. The force of friction opposing the motion is : Ff = μFg⊥

μ : coefficient of kinetic friction between box and ramp, and Fg⊥ : component of gravitational force perpendicular to ramp : Fg⊥ = mg cos θ

Fnet = Fg|| - Ff = mg sin θ - μmg cos θ

and we know, ma = mg sin θ - μmg cos θ

so, m = a / (g sin θ - μg cos θ)

m = 30 N / [(9.81 ) sin 37° - (0.4)(9.81 cos 37°] = 2.32 kg

ΔPE = mgh = (2.32)(9.81 )(3.6 ) = 81.5 J

Since the box is pulled upward, the work done by gravity is negative, so the answer is (A) -140 J.

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Answer:

2.345 would be the most precious because you have more numbers to work with and exact numbers

Answer:

Explanation:

You didn't ask a question here, but I assume you want the pressure? You can use the ideal gas equation stating that:

PV = nRT

The 'P' is pressure, the 'V' is volume, the 'n is number of moles of gas, the 'R' is the ideal gas constant, and the 'T' is the temperature. First convert the Celsius degrees into Kelvin by using the following relation:

C + 273.15 = K

4 + 273.15 = 277.15K

Now, find the volume of a cylinder by using:

\(V=\pi r^2l\)

The 'l' is the length of the cylinder

Now just plug and chug everything into the ideal gas equation:

\(PV=nRT\)

\(P(\pi r^2l)=(5moles)(8.3145J/moles*K)(277.15K)P=\frac{11.52J}{\pi r^2l}\)

Light phenomena can be better explained by a transverse wave model because light exhibits the characteristics of polarization, it is better described as a transverse wave, since only transverse waves exhibit polarization (option B).

Light is an electromagnetic wave that is made up of both electrical and magnetic fields oscillating perpendicular to each other. These waves travel in the form of transverse waves with an oscillation plane that is perpendicular to the direction of the wave's travel.

Light is always polarized, which means that the oscillations of its electric field are all in the same direction. The phenomenon of polarization can be explained in a transverse wave model, since only transverse waves can be polarized. The polarization of light is used in a variety of applications, including glare-reducing sunglasses, three-dimensional cinema, and some microscopes. Because light is an electromagnetic wave, it travels at the speed of light.

However, if light were a longitudinal wave, it would be unable to exhibit the polarization phenomenon, and therefore option D) Because light is an electromagnetic wave, it is better described as a longitudinal wave, since electromagnetic waves propagate at the speed of light is incorrect.

Option A) Because light can undergo refraction, the light is better described as a longitudinal wave, since only transverse waves are refracted and Option C) Because light can undergo reflection, the light is better described as a transverse wave, since only transverse waves are reflected by a surface are also incorrect.

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Answer: -2.5

Explanation:

1/2(-5)= -2.5

-2.5(1)= -2.5

Got it right in Khan Academy. You’re welcome.

Squeezing the clutch lever to slow down is best to be done when approaching a curve and is denoted as option C.

This is a mechanical device which used in the engagement and disengagement of transmission system in a vehicle.

Slowing down will give the driver more time to maneuver the curves so as to prevent accident. This is why it is imperative to squeeze the clutch in such road condition.

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Answer:

A. Capitalist economy

Explanation:

The United States is a capitalist economy. Hope this helps, thank you !!

Answer:

Water droplets could obtain charges thru contact with other drops.

Then if two similar drops (both positively charged) came in contact

charge could be transferred because one side of the drop would be positive and one side of the other would be negative by induction.

Several Physics Labs have built experiments called "Kelvins Thunderstorm"

where objects found in the home could be used to build a charge generator that can generate several thousand volts from falling water droplets.

Lightning usually occurs because of the very large potential that can build

because of charge differences between overhead clouds and the induced charge that will then follow in the ground. Mountain climbers know that it's time to look for safer ground when sparks start to jump from the ropes.

Answer:

It is 10.75

Explanation:

To repeat the same sound clip one after another, the method used is to concatenate the sound sample arrays. By concatenating the sound sample arrays, you create a new array that contains multiple copies of the original sound clip, effectively repeating it one after another. Therefore the correct option is b. Multiply the sound sample arrays by a scalar value less than 1.

When you want to repeat the same sound clip, one after another, you can achieve this by concatenating the sound sample arrays. Here's a step-by-step explanation:

1. Load the sound clip into MATLAB and convert it into a sound sample array.

2. Determine the number of times you want to repeat the sound clip.

3. Use the concatenation operator `[ ]` to join the sound sample arrays together.

4. Repeat the sound sample array as many times as desired by appending it to itself using the concatenation operator. For example, if you want to repeat the sound clip three times, you would write `[soundClip, soundClip, soundClip]`.

5. Store the concatenated sound sample array in a new variable.

6. If needed, you can then play the repeated sound clip using the `sound()` function in MATLAB.

By concatenating the sound sample arrays, you create a new array that contains multiple copies of the original sound clip, effectively repeating it one after another.

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A preserved quantity is momentum. Snowball and skater's initial system momentum is 0 because everything is motionless. A snowball must have zero motion overall after being thrown. To make the skater's momentum equal zero, she skates backward (in the opposite direction of the snowball).

The conservation of momentum is a general law of physics which states that the total momentum of a system remains constant and that the quantity called momentum which characterizes motion never changes in an isolated collection of objects. Momentum is the force necessary to bring an item to a complete stop in a unit of time, and is determined by multiplying an object's mass by its velocity.

The total momentum is equal to the sum of the individual momenta for any array of multiple objects. The momenta of objects moving in opposite directions might cancel out to produce an overall sum of zero, due to the oddity that momentum is a vector that includes both the direction and the amplitude of motion.

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If a warm air mass is located in the southwest united states and a cold air mass is located in the southeast united states, from west to east direction will the winds blow.

The prevailing westerlies blow from west to east, meaning that if a warm air mass is located in the southwest United States and a cold air mass is located in the southeast United States, the winds will blow eastward.

Therefore, from the east, the winds will blow. The winds will blow from the direction in which the pressure gradient force directs them.

The pressure gradient force is perpendicular to the isobars and directed from higher to lower pressure.

Wind is deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere as a result of the Coriolis force, which is a consequence of the Earth's rotation.

The prevailing westerlies are winds that blow west to east between 30° and 60° latitude in both hemispheres.

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The answer is 0.568 A.

The mathematical equation depicting the relationship of a charge and current is

Q = It

(1 faraday = 96500 C)

Here,

I - - > current

t - - > time

Standard value of atomic mass of nickel is 58.69 g/mol.

Using the moles formula,

n = m/M          

where n is number of moles

m is mass of substance and

M is the atomic mass.

Putting the values,

n = 2.8/ 58.69

n = 0.04770 mol

Now the charge on the Nickel ion is 2 hence

Q = 2 x 0.04770 F

  = 0.0954 x (96500C/1F)

  = 9206.1 C

Now, Q = It

Putting the values

9206.1 C = I x 4.5 hours

Now 4.5 hours = 16,200 seconds.

I = (9206.1)/(16200)

I = 0.56827 C/s or 0.56827 A

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Answer:

d. zero

Explanation:

Constant velocity means the acceleration is zero. In this case the velocity does not change,

hope this helps you

have a good day :)

The number of hydrogen atoms in the sun is 1.19 x 10⁵⁷.

Mass of the sun, M = 2 x 10³⁰kg

Mass of hydrogen, m = 1.67 x 10⁻²⁷kg

There are roughly 1057 hydrogen atoms in the Sun. There are 1080 atoms in the known universe, which is equal to the product of the number of atoms per star (1057) and the estimated number of stars in the universe (1023).

The equation for the number of hydrogen atoms in the sun is given by,

n = M/m

n = 2 x 10³⁰/1.67 x 10⁻²⁷

n = 1.19 x 10⁵⁷

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Vega is a main-sequence star of spectral type A, with a mass of about 2.1 times that of the Sun. As a main-sequence star, Vega is burning hydrogen in its core to produce energy, and it will continue to do so for several billion years.

After it exhausts the hydrogen in its core, Vega will enter a new phase of its life known as the red giant phase. During this phase, Vega will expand to become a much larger star, with a radius that may be several hundred times larger than its current radius. The outer layers of Vega will cool and become less luminous, causing the star to appear redder in color.

As the red giant phase progresses, the core of Vega will contract and heat up, eventually becoming hot enough to fuse helium into heavier elements. This process will release a large amount of energy, causing the outer layers of the star to be blown away in a massive explosion known as a planetary nebula. The hot, compact core that remains will eventually cool down and become a white dwarf, the final stage of stellar evolution for stars like Vega.

So, Vega is expected to expand into a red giant star before evolving into a white dwarf.

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If the energy input to an electric motor is 560J/s and 170J/s of energy is transferred to thermal energy when in use, the efficiency of the motor would be

It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.

As given in the problem If the energy input to an electric motor is 560J/s and 170J/s of energy is transferred to thermal energy when in use,

Useful energy = electrical energy - thermal energy lost

                        =560 J/s - 170 J/s

                        = 390 J/s

the efficiency of the motor = useful energy /electrical energy ×100

                                            = 390/560 ×100

                                            =69.64%

Thus, the efficiency of the motor would be 69.64%.

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