Ahemingway2948
01/11/2020
Physics
College
answered • expert verified
You throw a softball (of mass 300 g) straight up into the air. It reaches a maximum altitude of 10.1 m and then returns to you. What is the gravitational potential energy of the softball at its highest position? Assume the ball departed from and returned to ground level.
Assume no energy is lost by the softball while it is in the air. What is the kinetic energy of the softball as soon as it leaves your hand? Answer in units of J.
What is the kinetic energy of the softball when it returns to your hand? Answer in units of J.
What is the speed of the ball? Answer in units of m per s.

According to the solving  the value of average speed m =5 and value of n =2.

The average speed is the total distance it travels in a predetermined amount of time. The typical speed is represented by a scalar value. It is characterised by the magnitude and lacks direction.

150 million kilometers separate the planet from the sun.

We are aware that a million

= 10^6 and 1 km= 10^3 m

Hence,

150 million km = 150× 10^6 ×10^3 metre=150×10^9 m

                                                                                 =1.5×10^11 m

The speed of light in a vacuum is 2.999... m/s, which is roughly equivalent to 3.0 108 m/s.

Calculating the time it takes for the light beam to travel from the sun to Earth is demanded of us.

we know that average velocity v = distance/time

                                                      Time ⇒ distance/velocity

Here distance=1.5×10^11 m and v=c= 3.0×10^8 m/s

                           hence time

                                                         =0.5×10^3 s

                                                           =5.0×10^2 s

m10n [where m is the magnitude and n is the power of 10] is the proper way to write a scientific notation.                                                  

Hence the value of m =5 and value of n =2

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The largest momentum transferred to the skater is the skater catches the Frisbee, holds it momentarily, and throws it back to her friend.

The skater stands on a frictionless surface and his friend Frisbee starts moving behind him. The lack of friction makes the skater unstoppable.

However, when the skater returns to his friend through the Frisbee again, there is a backward force that increases the skater's speed. So and momentum is directly proportional to velocity, so as velocity increases so does momentum.

In Newtonian mechanics, momentum (more precisely, linear or translational momentum) is the product of an object's mass and velocity. A vector quantity that has magnitude and direction. If m is the object's mass and v is its velocity (which is also a vector quantity), then the object's momentum p is p = mv.

Advanced formulations of classical, Lagrangian and Hamiltonian mechanics allow the choice of coordinate systems containing symmetries and constraints. In these systems the conserved quantity is the generalized momentum, which is generally different from the momentum defined above. The generalized concept of momentum carries over into quantum mechanics and becomes the operator of the wavefunction. The momentum and position operators are related by the Heisenberg uncertainty principle.

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The angular velocity of a rotating object is 2.1 rad/s. So option A is correct.

It is defined as the rate of change of its angular position, and it is measured in units of radians per second (rad/s).

The angular velocity of a rotating platform can be calculated using the formula: angular velocity = 2 * pi * (frequency of rotation)

Frequency of rotation = 1 / time for one complete rotation = 1 / 3 sec = 0.33 Hz

Therefore, the angular velocity of the platform is 2 * pi * 0.33 Hz = 2.09 rad/s

The answer is closest to A 2.1 rad/s

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The height of Cliff is 45 m

It is given that

Velocity with which rock dropped from cliff =

30 m/s

intial velocity = 0 m/s

acceleration due to gravity = 10 m/s^2

We have to find how high was the cliff

v^2 - u^2 = 2as

(30)^2 - 0 = 2 x (-10) x s

900 = -20s

s = 45 m

Hence, height of Cliff is 45 m

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Scientists were surprised to discover that just like Saturn, all of the Jovian planets had rings.

Jovian planets include Jupiter, Saturn, Uranus, and Neptune and these planets have larger sizes and masses. Jovian planets do not have solid surfaces and they are sometimes called gas giants because they are large and made mostly of gases.

Jovian planets had rings but they were not as large or as well-known as Saturn's rings, but they were still present and visible under certain conditions. Unlike the terrestrial planets that make up our inner solar system,  Jovian planets do not have solid surfaces.

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Dialogic communication is the open sharing of ideas in an atmosphere of respect (in order to achieve understanding between the speaker and listener(s).

Dialogic communication is a method of communication that promotes dialogue between a speaker and their audience. In presenting their ideas to an audience, dialogic communication encourages speakers to be assertive (calm, respectful, and open). The dialogic theory is founded on three guiding principles: Monologue is less natural than dialogue. Meaning is found in people, not words. Perceived meanings are influenced by contexts and social situations (Bakhtin, 2001a; Bakhtin, 2001b). Mutuality, propinquity, empathy, risk, and commitment are the five principles underlying dialogic theory (Kent & Taylor, 2002). Mutuality is defined by an orientation toward inclusion or collaboration, as well as a spirit of mutual equality. Mutuality has two characteristics: collaboration and a spirit of mutual equality.

Here,

Dialogic communication is the open exchange of ideas in a respectful environment (to achieve understanding between the speaker and listener) (s).

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The best option that accounts for the pressure remaining constant in the vessel as the volume decreases below 0.21L is the ideal gas law PV = nRT

According to the ideal gas law, the ratio of a gas's pressure (P) and volume (V) to its moles (n) multiplied by its gas constant (R) multiplied by its temperature (T) is known as the ideal gas equation. The pressure and volume are inversely related when the number of moles and the temperature are held constant, which means that as the volume falls, the pressure increases and vice versa.

However, in this case, as the volume falls below 0.21L, the pressure inside the vessel stays constant. This could be explained by the use of outside forces, such a membrane or a piston, which can keep the gas under pressure even as it decreases.

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Force = 5.6N

Mass = 340g = 0.34kg

Acceleration= Force/mass

= 5.6/0.34 = 16.4m/s²

(A) When an air particle bombards a smoke particles, the smoke particle moves to the same direction as the air particle that hit it. When another air particle hits the smoke particle, it changes its direction to that of the second air particle, and so on. This is called Brownian motion.

(B) If the temperature of the surroundings is increased the air particles would gain kinetic energy resulting in more frequent collisions with the smoke particles. Therefore, the smoke particles would be seen moving haphazardly.

(C) The microscope helps magnify the smoke particles for a much more better observation. The lens help in focusing. As the air particles are really small and cannot be observed; therefore, smoke particles are used as they are easy to see and observe; thus, ensuring a better experiment.

A collision at 30 mph will take any loose object in your car and give it the same force as if it were: shot from a canon.

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Suppose exactly 6.95 g of each reactant is taken and the following details are given by A and B then 6.95 g of A is equivalent to 6.95/molar mass of A moles of A. 6.95 g of B is equivalent to 6.95/molar mass of B moles of B.

To determine which reactant is limiting, we need to compare the amount of each reactant to the stoichiometry of the reaction.

The stoichiometry of the reaction is 1:2 for reactants A and B, respectively.

Therefore, if we have 6.95 g of A and 6.95 g of B, we can calculate the ratio of A to B to determine which reactant is limiting.

6.95 g of A is equivalent to 6.95/molar mass of A moles of A.

6.95 g of B is equivalent to 6.95/molar mass of B moles of B.

Comparing the moles of A and moles of B, we can see that A is limiting, as there is less A than required by the stoichiometry of the reaction.

To determine the mass of the excess reagent (B) that will remain after the limiting reactant (A) is consumed, we need to calculate the moles of B that are in excess.

We can calculate the moles of B that are used up by the reaction (based on the stoichiometry of the reaction) and subtract this from the total moles of B that were initially present.

The remaining moles of B can then be converted back into grams to find the mass of B that will remain.

Using the above method, the mass of the B remaining after A is consumed can be calculated.

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Answer:

17,753.24 J (Joules)

Explanation:

To calculate the kinetic energy of an object, we use the formula:

Kinetic energy = 1/2 * mass * velocity^2

where mass is measured in kilograms and velocity is measured in meters per second.

Given that the boat has a mass of 1,678 kilograms and a velocity of 4.6 meters per second, we can substitute these values into the formula to find its kinetic energy:

Kinetic energy = 1/2 * 1,678 * (4.6)^2

Kinetic energy = 1/2 * 1,678 * 21.16

Kinetic energy = 17,753.24 J (Joules)

So the kinetic energy of the 1,678-kilogram boat moving at 4.6 m/s is 17,753.24 J (Joules).

The strength of the Sun's gravitational field at this distance is [tex]0.622m/s^2[/tex]

A gravitational field is defined as the model used to explain the effects that a massive body exerts in the space around it exerts a force on another massive body. Therefore, a gravitational field is used to explain gravitational phenomena, and it is measured in newtons per kilogram.

The acceleration due to gravity on the surface of the earth is given by;

[tex]g = GM/R^2[/tex]

Where, g is the acceleration due to gravity

G  is Gravitational constant [tex](6.673 * 10^-^1^1 Nm^2 kg^-^2)[/tex]

M is the mass of the planet [tex](1.99* 10^3^0 kg)[/tex]

R is the radius of planet

So, for above given information, [tex]g= \frac{6.022 * 10^-^1^1* 1.99* 10^-^3^0}{(1.46* 10^1^1)^2}[/tex]= [tex]0.622m/s^2[/tex]

Thus, the strength of the Sun's gravitational field at this distance is [tex]0.622m/s^2[/tex].

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The percentage at which the transferred electrons change the mass of the penny is [- (n x 9.1 x 10⁻³¹)/m] x 100 .

The deficiency  or excess  of electrons in an atom leads to the development of charge.

The total mass of coin after loosing electrons is calculated as follows;

= m - (n x 9.1 × 10⁻³¹ ) Kg

where;

There will be decrease in the mass of the penny.  So the amount of decrease in mass will be;

= final mass - initial mass

= m - (n x 9.1 × 10⁻³¹ ) - m

= - (n x 9.1 ×10⁻³¹ )

This negative sign indicates that the mass has decreased.

The percentage decrease in the amount of mass transferring the electrons is calculated as;

[- (n x 9.1 x 10⁻³¹)/m] x 100    

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Wycleff is on block 1, Lilly is on block 4, Emilia is on block 12, and Quincy is on block 17 is the correct statement about each person standing at block.

As a source and observer move closer or farther apart, the Doppler effect, which is a phenomenon in physics, causes the frequency of sound, light, or other waves to rise or fall. When a source emits waves, those waves are compressed as they approach the observer.

Wycleff could hear a low-pitched sound the entire time, indicating that the police car was relocating away from him. He was thus in block 1.

A Doppler effect (change in pitch) was the first thing Lilly noticed. She was at block 4, so the car must have passed her first.

After Lilly, Emilia noticed a Doppler effect. She was at block 12 when the car passed Lilly before passing her.

The entire time, Quincy heard a high-pitched sound, which indicated that the police car was approaching. He was thus in block 17.

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If we drop 2 objects of different weights from the same height, both of them will reach the ground at the same time.

Gravity, at the surface of a body like Earth, provides an acceleration to bodies and this acceleration is constant and its value is equal to 9.8m/s².  This is because the Earth attracts big objects more than little ones, but the big ones have more inertia, which cancels out. So, all the bodies on the earth's surface fall at the same acceleration of 9.8m/s²

This acceleration due to gravity,g is independent of the mass of the body. The time of flight for any freely falling object depends on the value of acceleration due to gravity and its initial speed. So both the bodies reach the ground at the same time.

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Answer:

Yes, you are correct. In order to be in equilibrium, two charges must have equal but opposite charges. So, if the total charge is -6 x 10^-9 C, dividing it into equal and opposite charges would give each charge a value of 3 x 10^-9 C. This is because (-6 x 10^-9 C) / 2 = 3 x 10^-9 C.

It will take 207.9 sec for the pendulum's swing to be reduced to half its initial amplitude.

given:

T= time period initial  = 1 sec

time constant = 300 sec

The pendulum's  oscillation will eventually be stopped due to the air resistance offered by air .  Oscillations will die down in a manner such that it makes an exponential curve.

We want the time at which the pendulum will stop due to friction

We know the formula for damping

[tex]A = A[/tex]'  [tex]e^{-(\frac{t}{300} )}[/tex]

A= initial amplitude

A' = final amplitude = A/2

so 't'  at

[tex]A = \frac{A}{2} \ 300[/tex] ㏑ (2 )

t= 207.94 sec

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Uneven heating patterns Uneven heating causes Hadley cells, which disperse heat; convection currents, which redistribute heat; wind currents, which redistribute heat; and ocean currents, which redistribute.

If you have access to natural gas as a heating source where you live, it will probably end up being the least expensive way of heat a house. Despite price increases, natural gas remains the most affordable space heating option. Electricity, gas, and heating oil are next, going from the next least expensive from the most expensive.

The most effective type of house heating is a heat pump. Their biggest flaw is that they don't work well at extremely high or low temperatures. You can require space heaters all over your house during extremely cold weather, which reduces efficiency.

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In this case, member be is in compression because force Fbe = -Fec - Fed is negative. Member ef is in tension because force Fef = -Fed - Fae is positive. Member cb is in compression because force Fcb = -Fae - Fec is negative.

Equilibrium is the condition of a system when neither its state of motion nor its internal energy state tends to change with the time.

For member be:

Fbe = Fce + Fde

Fbe = -Fec - Fed

And For member ef:

Fef = Fde + Fae

Fef = -Fed - Fae

For member cb:

Fcb = Fae + Fce

Fcb = -Fae - Fec

If the force is positive it is in tension, if it is negative it is in compression.

And, in this case, member be is in compression because force Fbe = -Fec - Fed is negative. Member ef is in tension because  force Fef = -Fed - Fae is positive. Member cb is in compression because force Fcb = -Fae - Fec is negative.

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The right block must have a mass of 7.9 kg to balance the forces and remain stationary.

The two blocks remain stationary when the net force on the system is zero. In this case, the force of gravity on the two blocks is balanced by the tension in the rope connecting them. The tension in the rope can be determined using the sine of the angles and the masses of the blocks.

Tension = (mass1 × gravity) × sin(angle1) + (mass2 × gravity) × sin(angle2)

Substituting the known values:

Tension = (10 kg × 9.8 m/s²) × sin(23°) + (mass2 × 9.8 m/s²) × sin(40°)

Solving for mass2:

mass2 = (Tension - (10 kg × 9.8 m/s²) × sin(23°)) / (9.8 m/s² × sin(40°)).

The mass of the right block must be 7.9 kg for the two blocks to remain stationary.

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The question is -

Two blocks in the Figure below are at rest on frictionless surfaces What must be the mass of the right block so that the two blocks remain stationary? 4.9kg 6.1kg 7.9kg 9.8kg

Heat emitted from a candle, Microwaves from a microwave oven, Radio waves transmitted between towers, Sound waves from a car radio.

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Answer:

The power of the pump can be calculated using the following equation: Power = (Volume of water * Density of water * gravity * height) / (Time * Efficiency)

Therefore, the power of the pump is (12 * 1000 * 10 * 15) / (40 * 0.65) = 18,750 Watts.

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For best results, if not tested immediately, a semen sample should remain at a temperature 37 ºC. Thus, option C is correct.

Temperature is a physical property of matter that quantitatively expresses the common notions of hot and cold. Temperature is measured with a thermometer, which may be calibrated to a variety of temperature scales, including Celsius, Fahrenheit, Kelvin, and Rankine. The most commonly used scales are Celsius (formerly called centigrade) and Fahrenheit.

In scientific terms, temperature is the measure of the average kinetic energy of particles in a system. Temperature is an intensive property, meaning it is independent of the amount of matter in a system. For example, water at a given temperature is the same regardless of whether it is in a glass, a bucket, or an ocean.

This temperature range is the optimal temperature for preserving the viability of the sperm cells. If the sample is not tested immediately, it should be stored in a refrigerator or cooler with a temperature at or below this range to ensure the best possible results.

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Complete question:

For BEST results, if not tested immediately, a semen sample should remain at which of the following temperatures following collection?

a) 4 ºC

b) Room temperature

c) 37 ºC

d) -40 ºC

When two long wires are separated by a distance x and oriented perpendicular to each other, a charge placed at certain points will remain stationary due to the balance of electric forces acting on it.

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Changes in the quantity and quality of light can have significant impacts on aquatic environments, both on the organisms that live there and on the physical characteristics of the water. Some key impacts include:

What are the changes in quantity and quality of light that can have significant impact?

Overall, changes in the quantity and quality of light can have significant and wide-ranging impacts on aquatic environments, affecting everything from the productivity and temperature of the water to the distribution and survival of different species.

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A. Speed ; B. kinetic energy ; C. Kf = K1 + W ; D. The statements are false. E. Kf = K1 + (FD) ; F. v = sqrt(2Kf/M).

In physics, kinetic energy of an object is the energy that it possesses due to motion.

A. If the force is applied for a fixed interval of time t, then speed of the particle will increase by an amount at.

B. If the force is applied over  given distance D, along the path of  particle, then kinetic energy of the particle will increase by FD.

C. Kf in terms of K1 and work W done on particle is : Kf = K1 + W

D. The statements are false. The dot product does not guarantee that the integrand is always nonnegative and also it does not indicate that only the component of force perpendicular or parallel to the path contributes to integral.

E.  Final kinetic energy Kf in terms of v1, M, F, and D is Kf = K1 + (FD)

F. Final speed can be determined using the formula, Kf = 1/2 * M * v^2. where v is final speed. It can be rearranged to find v = sqrt(2Kf/M).

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The correct answer is b. They are required to establish the OCPD's typical ampere rating.

What are the benefits of performing short-circuit calculations in an electrical system?

Performing short circuit calculations in an electrical system can provide a number of benefits.

Short circuit calculations can help prevent potential safety hazards and maximize the efficiency of the electrical system.

By performing these calculations, the system can be designed to ensure that any overcurrent are limited to safe levels and that the equipment is not overloaded.

Additionally, the calculations can be used to determine the fault level of the system, allowing for the selection of components and the assignment of protective devices that can effectively manage any overcurrent that occur.

By having an understanding of the fault level, the system can be designed to prevent any outages that could occur due to overloading or short circuiting of the system.

Short circuit calculations also provide a way to verify the functionality and performance of the system, as well as identify any areas that require improvement.

Overall, short circuit calculations are an invaluable tool for designing and maintaining a safe and reliable electrical system.

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Correct options are the gravitational force is inversely to proportional to the distance, and the electrical force is inversely proportional to the square o the distance.

Electrical force is the force that is exerted on charged particles due to the presence of other charged particles. It is a fundamental force of nature, and it is one of the four fundamental forces of physics, along with the strong nuclear force, the weak nuclear force, and the gravitational force. Electrical force is responsible for the behavior of charged particles in electric and magnetic fields, and it is the force that holds atoms and molecules together. The electrical force is mediated by the exchange of virtual photons.

Both gravitational and electric forces, according to Coulomb's law, decrease with the square of the distance between the objects, and both act along a line between them. However, in Coulomb's law, the magnitude and sign of an object's electric force are determined by its electric charge rather than its mass. Charge thus governs how electromagnetism influences the motion of charged objects.

[tex]$ F = k \frac{q_1q_2}{r^2}[/tex]

F = electric force

k = Coulomb constant

q₁, q₂= charges

r = distance of separation

And

[tex]$F=G{\frac{m_1m_2}{r^2}}[/tex]

F = force

G = gravitational constant

m₁ = mass of object 1

m₂ = mass of object 2

r = distance between centers of the masses

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The complete question is given below:

Alpha Centauri (4.4 ly from the Solar system) in 70 years. The speed should be around 6.8×107 kph.

What is meant by speed ?

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