A human runner has an average acceleration of 1.2 m/s/s. They ran for a total of 21 seconds. What is their change in velocity?

The projectile object have in the vertical direction after it is launched horizontally has constant velocity.

What is constant velocity?

Constant velocity is a constant speed in a particular direction. It is a type of motion in which the position of an object changes by the same amount each second. This means that the velocity of the object remains constant, which can be measured with a constant speedometer or a special device called an accelerometer. Constant velocity is the opposite of acceleration, in which an object's speed changes over time.

A projectile object launched horizontally will have a constant velocity in the vertical direction due to the force of gravity, since the only force acting on it is gravity. Therefore, it will maintain its speed and direction in the vertical direction, which is known as constant velocity.

Therefore, constant velocity is the answer.

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Answer:

Force = Mass * Acceleration

25 = Mass * 95

Mass = 95/25

Mass = 3.8 kg

Answer:

I hope the above pic will help you

I will always help you understanding your assingments

have a great day #Captainpower:)

The quantity of light energy emitted at 40W, in five minutes or 300 seconds will be 1200J.

Equation:

40 W total power

40 W = 40 J/s (joules per second)

10% efficiency

Efficiency x Power Equals Actual Power output

40x0.1 = 4W

Power x Time Equals Energy

300 s x 4 W = 1200 J

Energy of Light = 1200 J

Things like stars, lightbulbs, lasers, and hot objects all emit light energy. Light energy travels from stars like our Sun to the Earth. A natural source of light energy is the Sun.

The electromagnetic spectrum is much larger than the light we can see, which is made up of each hue in the rainbow. Other forms of light include those that are invisible to the human sight, such as radio waves, microwaves, infrared radiation, ultraviolet rays, X-rays, and gamma rays.

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Answer:

to prevent the government from abusing people's rights

Explanation:

Bill of rights is made up of the first ten amendments to the United States Constitution.

The bill of right include Freedom of religion, speech, press, assembly and petition.

The Right to keep and bear arms in order to maintain a well regulated militia.

The Right to due process of law, freedom from self-incrimination, double jeopardy.

The purpose of this bill is to protect the rights of citizens against infringement from the government,public officials and private citizens.

Gamma rays widely used in medical sector mostly in radio pathy and scientific research laboratories for sterilization.

Define gamma rays:

Electromagnetic energy which is emitted after disintegration or decaying of two different radioactive nuclei is considered as gamma rays.

Uses of gamma rays:

Gamma rays have high penetration power with particular matter and go through ionization process mostly by photoelectric effect. The impact of gamma rays can be hazardous upon human body due to high penetration and increases health risk.

Gamma rays mostly used for sterilization process which mostly use to destroy microorganism and sterilize the surgical equipment and different laboratory equipment. Food industries also use this ray to maintain quality and hygiene of food.

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The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only transformed from one form to another.

This law applies to all physical systems and is a fundamental concept in the field of thermodynamics. The first law can be expressed mathematically as:

ΔE = Q - W

where ΔE is the change in internal energy of a system, Q is the heat added to the system, and W is the work done by the system. The internal energy of a system represents the total amount of thermal, kinetic, and potential energy that is stored within it.

The first law of thermodynamics is a key principle in understanding the behavior of energy in physical systems. For example, it helps explain why energy must be input into a system to increase its temperature, and why energy is lost in the form of heat and work as a result of changes in a system's state. Additionally, the first law of thermodynamics is a critical component of many applications, such as engines, power plants, and other heat-based technologies, where energy must be converted from one form to another in order to perform useful work.

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Answer:

M a = (M1 + M2) a = F         Newton's Second Law

F = (M2 - M1) g         net force on the system

a = (M2 - M1) / (M1 + M2) g

a = (9 - 7) / (9 + 7) g = 2 / 16 * 10.0 m/s^2 = 1.25 m/s^2

The principal difference between an MHD generator and a conventional generator lies in their operational mechanisms.

While conventional generators work by converting mechanical energy into electrical energy through the use of electromagnetic induction, MHD generators produce electricity by utilizing a combination of magnetic and electric fields to ionize a conductive gas and create a flow of charged particles.

Additionally, MHD generators can operate at higher temperatures and pressures than conventional generators, allowing for more efficient energy production.

However, MHD generators are more complex and expensive to build and maintain than conventional generators, and they require a constant source of high-temperature gas to function.

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Let's look at relationship

\(\\ \rm\rightarrowtail T=2\pi\sqrt{\dfrac{m}{k}}\)

\(\\ \rm\rightarrowtail T\propto \sqrt{m}\)

Hence

\(\\ \rm\rightarrowtail \dfrac{T_1}{T_2}=\sqrt{\dfrac{m1}{m2}}\)

\(\\ \rm\rightarrowtail \dfrac{1.5}{2}=\sqrt{\dfrac{0.5}{m2}}\)

\(\\ \rm\rightarrowtail 0.75^2=\dfrac{0.5}{m2}\)

\(\\ \rm\rightarrowtail m_2=\dfrac{0.5}{0.75^2}\)

\(\\ \rm\rightarrowtail m_2=0.889\)

Hence

Answer

Mass needs to added =0.889-0.500=0.389kg

Explanation:

The work done while slowly lowering the 20.0-kg bag of sand 1.20 m from the trunk of a car to the driveway is approximately 235.2 Joules.

To calculate the work done while lowering the bag of sand, we can use the formula:

Work = Force x Distance x cos(theta)

In this scenario, the force is the weight of the bag of sand, the distance is the vertical distance the bag is lowered, and theta is the angle between the force and the displacement. Since the bag is being lowered vertically, theta is 0 degrees, and cos(0) is equal to 1.

Calculate the force:

The force exerted by the bag of sand is equal to its weight. The weight can be calculated using the formula:

Weight = mass x gravitational acceleration

Weight = 20.0 kg x 9.8 m/s^2 (gravitational acceleration)

Weight = 196 N

Calculate the distance:

The distance the bag is lowered is given as 1.20 m.

Calculate the work done:

Using the formula for work:

Work = (196 N) x (1.20 m) x (cos 0°)

Since cos(0°) = 1:

Work = (196 N) x (1.20 m) x (1)

Work = 235.2 Joules

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Answer:

Explanation:

Fe₂O₃ + 3C ---> 2Fe + 3CO

1 mole                          3 moles

From the balanced equation above , we see that , 1 mole of Fe₂O₃ reacts with carbon to form 3 moles of CO .

So , 4 moles of  Fe₂O₃ will react with carbon to form 3 x 4  moles of CO .

moles of CO formed = 3 x 4 moles = 12 moles.

The supply curve will shift to the left.

The new equilibrium price (producer price) will be around $4.75.

The new equilibrium quantity will be approximately 18.25.

When a tax of 50 cents per liter is introduced on gasoline, it affects the price that consumers pay for gasoline, not the producer price. To analyze the effects of the tax, we need to adjust the demand and supply equations.

Given:

Supply: q = 6 + 3p

Demand: q = 36 − 3p

To incorporate the tax into the equations, we need to consider that the price consumers pay (including the tax) is higher than the producer price by the amount of the tax. Let's denote the consumer price as p_c and the producer price as p. We can relate these prices using the following equation:

p_c = p + 0.50

Now we can adjust the demand equation to reflect the consumer price:

q = 36 - 3p_c

q = 36 - 3(p + 0.50)

q = 36 - 3p - 1.50

q = 34.50 - 3p

The supply equation remains the same.

Now, let's analyze the effects of the tax on the equilibrium.

Shift in Supply/Demand:

Since the tax is imposed on producers, it affects the cost of production and supply. The supply curve will shift leftward because producers will need to increase the price to cover the additional tax burden. Therefore, the correct answer is: The supply will shift to the left.

New Equilibrium Price:

To find the new equilibrium price, we need to set the adjusted supply and demand equations equal to each other:

6 + 3p = 34.50 - 3p

Simplifying the equation:

6p = 28.50

p ≈ 4.75

Therefore, the new equilibrium price (producer price) will be around $4.75.

Change in Quantity:

To find the change in quantity, substitute the new equilibrium price into either the supply or demand equation:

q = 6 + 3(4.75)

q ≈ 18.25

Therefore, the new equilibrium quantity will be approximately 18.25.

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The magnitude of the racquetball's change in momentum is 0.59 kgm/s approximately.

Given that a racquetball with a mass of 42 g is moving with a horizontal speed of 7 m/s to the right (+x direction).

mass m  = 42g = 42/1000 = 0.042kg

initial velocity before collision u = 7 m/s

It hits the wall of the court and rebounds to the hitter with a horizontal speed of 7m/s to the left (-x direction). That is,

velocity after collision v = 7 m/s

To calculate the magnitude of the racquetball's change in momentum, we will use the formula below

Change in momentum = Mv - Mu

Since momentum is a vector quantity, we will consider the direction.

Change in momentum = 0.042 x 7 - ( 0.042 x - 7)

Change in momentum = 0.294 + 0.294

Change in momentum = 0.588 kgm/s

Therefore, the magnitude of the racquetball's change in momentum is 0.59 kgm/s approximately.

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The weight of the transformer is 138.46 N.

Weight can be calculated by dividing workdone by height

To calculate the weight of the transformer, we use the formula below.

Formula:

Where:

Substitute these values into equation 1

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The correct option is option e) cross product

The cross-product is a new way of "multiplying" two vectors. It results in a new vector that is perpendicular to both the original vectors and its magnitude is given by the area of the parallelogram formed by the two original vectors.

In three-dimensional space, cross-product is a binary operation on two vectors. It yields a vector perpendicular to both vectors. a b represents the vector product of two vectors, a and b. Its resulting vector is parallel to a and b. Cross goods are another name for vector products.

The cross-product has four basic applications:

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Answer:

a. normal

Explanation:

In the field of physics the normal is a line drawn at a right angle to a barrier. In other words the normal line is the line that is drawn perpendicular (right angle, 90 degrees) to the reflective surface of a mirror, or the particular boundary in which refraction occurs at the point of incidence of a light ray. This can be seen in the picture attached below.

Answer:

An air mass that is moving from the north pole toward the equator would be turned to the East because of the spinning of the earth on its axis

Explanation:

An air that is moving from the North pole toward the equator will be turned to the East (right) because of the spinning of the earth around its own axis.

The Coriolis Effect can be described as an apparent effect generated by a rotating frame of reference. The effect takes place when an object moving along a straight path can be viewed from a non-fixed frame of reference.

The moving frame of reference is the one in which the Earth rotates at a fixed speed.  The Coriolis effect creates wind patterns near the earth’s surface, that move to the east toward the equator and to the west toward the poles. These wind patterns are responsible for moving clouds around the globe and creating weather patterns.

Coriolis force can be described as a fictitious force resulting from the rotational movement of the earth. It only affects the wind direction and not the wind speed. The magnitude of Coriolis force can be calculated from the wind speed.

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A car with a mass of 950 kg is moving at 20 m/s when that collision with another car with a mass of 1000 kg that is moving at 15 m/s. The speed of each car prior to the collision was 2.05 m/s.

A collision, also referred as an impact, seems to be the abrupt, violent coming together in close proximity of two bodies. Examples include two pool cues, a tennis club and a ball, as hammer but a nail hammer, and two transport vehicles when they are linked.

The forces involved in a collision are equal in size and directed in the opposite direction, and they accelerate both objects. Each object accelerates equally in collisions with things of equal mass.

Momentum

m1V1 = 950 Kg * 20 m/s

= 19000 Kg*m/s

momentum = m2V2

= 1000kg*15m/s

= 15000 Kg*m/s

momentum before = (19000–15000)kg-m/s

= 4000kg-m/s

momentum after = ( 950 + 1000)V3

momentum after = momentum before

= V3

= 4000/1950

= 2.05 m/s

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Answer:

Sorry for being late. Hope this helps

Explanation:

Answer:

227 seconds.

Explanation:

Speed is equal to distance divided by time. s = d/t

We can rearrange this algebraically to solve for the time it will take to cover a certain distance at a certain speed. Time is equal to distance divided by speed.  t = d/s

Then we substiture our known values for the variables and solve for our unknown.

t = 454m / 2m/s = 227s

Answer:

If the lady is traveling 2 meters per second and she travels 454 meters then you will have to divide 454 by 2 to get the amount of time she walked.

454 divided by 2 = 227

This means that the lady traveled for 227 seconds or about 3.78 minutes.

Answer:

b) Quartz Clock

Explanation:

It's is a very type of clock which uses the vibration of quartz crystals to measure time accurately

Answer:

...wow...

interesting

Heat is a form of energy that is transferred from one body to another as a result of a difference in temperature. This transfer of thermal energy can occur through conduction, convection, and radiation. Correct option is A.

Water, on the other hand, is not a form of energy, but it is a crucial component in many energy-producing processes. For example, water is used in hydropower generation to generate electricity.

Light is a form of electromagnetic radiation that is visible to the human eye. Light energy travels in waves and can be harnessed for various purposes, such as lighting and solar power generation.

X-radiation, also known as X-rays, is a form of high-energy electromagnetic radiation. X-rays are used in medical imaging to produce images of bones and other internal structures of the body. X-rays are also used in scientific research and in industrial applications, such as material testing and inspection.

In conclusion, heat, light, and x-radiation are all forms of energy, while water is not a form of energy, but it is a necessary component in many energy-producing processes.

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Answer:

wrapping around the wire around iron core several times

Explanation:

adding more turns to the coil. increasing the current flowing through the coil.

Answer:

No.

Explanation:

A feather is less dense and thus less force exerted while a rock is very dense thus exerting more force .

Answer:

A 220 N

Explanation:

it’s the only one not marked out on the photo. Hope this helps!

Explanation:

Given that,

Initial position, h₀ = 50 m

A rock is tossed straight up into the air with a velocity of 20.0m/s

(a) When the rock reaches its maximum height, its final velocity, v = 0. Using equation of kinematics as follows :

v=u+at

here, a = -g

\(t=\dfrac{u}{g}\\\\t=\dfrac{20\ m/s}{10\ m/s^2}\\\\t=2\ s\)

(b) Let h is the maximum height reached by the toss. It can be given by :

\(h=h_0+ut-\dfrac{1}{2}gt^2\\\\h=50+20\times 2-\dfrac{1}{2}\times 10\times 2^2\\\\h=70\ m\)

(c) Let T is the time it takes the rock to reach the ground. It is equal to the sum of time reaches to its maximum height and the remaining time. It can be calculated as follows :

\(T=t+\sqrt{\dfrac{2h}{g}}\)

Putting all the values,

\(T=2+\sqrt{\dfrac{2\times 70}{10}}\\\\T=5.74\ s\)

(d) Let v is the velocity of the rock as it hits the ground. It can be calculated as follows :

v = u - gt

\(v = 20 - (10)(5.74)\\\\v=-37.4\ m/s\)

Negative sign shows it comes in downward direction.

Answer:

An electric bell is placed inside a transparent glass jar. The bell can be turned on and off using a switch on the outside of the jar. A vacuum is created inside the jar by sucking out the air. Then the bell is rung using the switch. What will we see and hear?

A.

We’ll see the bell move, but we won’t hear it ring.

B.

We won’t see the bell move, but we’ll hear it ring.

C.

We’ll see the bell move and hear it ring.

D.

We won’t see the bell move or hear it ring.

E.

We’ll see the sound waves exit the vacuum pump.

Explanation:

so, the answer to the question is

A.

We'll see the bell move, but we won’t hear it ring.

Answer:

A.

We’ll see the bell move, but we won’t hear it ring.

Explanation:

Sound waves need a medium to travel and cannot travel in vaccuum

The jovian planets in our solar system include Jupiter, Saturn, Uranus, and Neptune. These gas giants are distinct from the terrestrial planets like Mercury, Venus, Earth, and Mars.

Jovian planets, namely Jupiter, Saturn, Uranus, and Neptune, are characterized by their composition and physical properties. They are primarily composed of gases and lack a solid surface. Jovian planets are much larger in size compared to the terrestrial planets.

They possess thick atmospheres with swirling cloud formations and dynamic weather systems. These gas giants also have a significant number of moons and are accompanied by planetary rings made up of dust and ice particles.

Jovian planets are located farther away from the Sun and have lower densities compared to the terrestrial planets. Their unique characteristics distinguish them from the rocky, inner planets like Mercury, Venus, Earth, and Mars.

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