A truck covers 40.0 m in 8.55 s while uniformly slowing down to a final velocity of 2.45 m/s.(a) Find the truck's original speed. ________m/s(b) Find its acceleration. _______m/s2

Answer:

0 J

Explanation:

1. We know that U = mgh,
h = U/mg
or h = 73.5/3*9.8 = 2.5 m

2. When the book falls on the ground, there will be no kinetic energy by the book as the book will once again be stationary, and will convert this kinetic energy to other forms, so your answer must be 0 J.  

Answer:

Divide by 1000

Explanation:

Answer:

the distance x increases as the student increase the mass of the cannon.

Explanation:

a) From the question ; we get to understand that for each launch, the students use a different mass which is launch at  speed v relative to the ground.

This changes in the mass used brought about a change in the momentum at the same speed v ; perhaps an increase in momentum. However; since the conservation of the momentum is considered at each launching.

The momentum of the marble = momentum of the cannon

But since the momentum of the cannon increase ; therefore the same equivalent changes takes place in its kinetic energy . Therefore , the kinetic energy will increase and the distance will also increase in the bid to quench the amount of energy generated. Thus, the distance x increases as the student increase the mass of the cannon.

b)We all know that  conservation of the momentum will definitely  takes place after launching of the cannon.

Let assume that \(\rho\) is the momentum of the cannon with mass \(M_C\)

The kinetic energy of the canon will be:

\(\frac{\rho ^2 }{2 M_C}\)

Also the frictional force acting on the cannon is :

\(f = \mu mg\)

If the cannon move at an  additional distance x; the frictional force acting at this area quench the amount of the energy generated and consume the kinetic energy of the cannon;

So;

\(fx = K.E\)

\(fx = \frac{\rho ^2 }{2 M_C}\)

\(\mu mg x = \frac{\rho ^2 }{2 M_C}\)

\(x = \frac{\rho ^2 }{2 \mu mg M_C}\)

\(x = \frac{m_m^2 V^2 }{2 \mu mg M_C}\)

Thus; it is consistent with the answer in (a) as increase in the mass of the marble will bring about an increase in distance x

The increase in the mass of the marble increase the distance of the cannon.

Momentum:

Momentum of an object is equal to the product of the mass and the velocity of the object.

The kinetic energy of the cannon

\(K_C = \dfrac {\rho^2}{2 M_C}\)

Where,

\(\bold{\rho}\) - momentum of the cannon

Mc -  mass

The frictional force on cannon

\(\bold{F_f = \mu mg}\)

Cannon move a distance x,

Hence,

\(\bold {F_f \times x = K_C}\\\\\bold {\mu m g \times x = \dfrac {\rho^2}{2 M_C }}\\\\\bold {x = \dfrac {\rho^2}{2\mu m g M_C }} }\\\\\bold {x = \dfrac {m^2 V^2}{2\mu m g M_C } }\)

Therefore, The increase in the mass of the marble increase the distance of the cannon.

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The time at which the Alejandra will stop accelerating is 14 seconds.

As the stated question:

Alejandra's acceleration a = 2.0 m/s².

Initial time t1 = 3.0 s.

Initial velocity u = 5.0 m/s

Final velocity v = 27 m/s.

Final time t2:

The formula for the acceleration is:

a = (v - u)/ (t2 - t1)

2.0 = (27 - 5)/(t2 - 3)

t2 - 3 = 22/2

t2 = 11 + 3

t2 = 14 seconds

Thus, the time at which the Alejandra will stop accelerating is 14 seconds.

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The correct question is question 9.

Single Wire moves down, loop rotates left.

A single-wire system is a method of transmitting power or signals using only a single conductor. This is in contrast to the usual use of a pair of wires to provide a complete circuit, or an electrical cable containing (at least) two conductors for this purpose.

A single-wire transmission line is not the same as a single-wire earth return system. This is beyond the scope of this article. The latter system relies on reverse current flow through earth, using earth as a second conductor between earth terminal electrodes. A single-wire transmission line does not have a second conductor of any kind. 

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Answer:

W= 40 J

P=8 W

Explanation:

solution for work:

w=f d

= 4n (10 m)

= 40 J

Solution for Power

p= w/t

= 40 J/5 s

= 8 W

The current in the circuit 25 µs later, given that the switch is changed to position "b" is 0.36 A

From the question given above, the following data were obtained:

The current in the circuit can be obtain as illustrated below:

Q = It

But,

Q = CV

Thus,

It = CV

I × 25×10⁻⁶ = 1×10⁻⁶ × 9

I × 25×10⁻⁶ = 9×10⁻⁶

Divide both sides by 25×10⁻⁶

I = 9×10⁻⁶ / 25×10⁻⁶

I = 0.36 A

Thus, from the above calculation, we can conclude that the current in the circuit is 0.36 A

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Answer:

The mass will be 227kg.

Explanation:

Mass is a measure of how much "stuff" is in an object. It's a measure of the number and type of atoms in something, and is fixed. If you and I went to the moon right now, our bodies wouldn't change what they were made of. I would still be made up of all the same "stuff," as would you! So my mass would be the same and so would yours.

Weight would change on the moon, because weight is a measure of the local pull of gravity on an object's mass. Earth's gravitational force is about 10m/s2 and the moon's is about 1.6m/s2. So on the moon, I would have a weight of about 1/6 my weight on Earth... but I'd still wear the same size jeans!

Answer:

3.03 seconds, 29.51 m/s

Explanation:

To solve this problem, we can use the kinematic equations of motion. The equation we will use is:

y = vi * t + 0.5 * a * t^2

where y is the displacement (height), vi is the initial velocity, a is the acceleration due to gravity (9.81 m/s^2), and t is the time.

At the top of the building, the displacement is 22 m (the height of the building), the initial velocity is 15 m/s (downward), and the acceleration is -9.81 m/s^2 (due to gravity, and negative because it is acting in the opposite direction to the initial velocity).

We can rearrange the equation to solve for time:

y = vi * t + 0.5 * a * t^2

22 = 15t - 0.5 * 9.81 * t^2

0.5 * 9.81 * t^2 - 15t + 22 = 0

Solving for t using the quadratic formula, we get:

t = (-(-15) ± sqrt((-15)^2 - 4 * 0.5 * 9.81 * 22)) / (2 * 0.5 * 9.81)

t = 3.03 s (rounded to two decimal places)

Therefore, it takes approximately 3.03 seconds for the ball to hit the ground.

To find the velocity of the ball when it hits the ground, we can use the equation:

v = vi + a * t

where v is the final velocity (unknown), vi is the initial velocity (15 m/s downward), a is the acceleration due to gravity (-9.81 m/s^2 downward), and t is the time (3.03 s).

Substituting the values, we get:

v = 15 - 9.81 * 3.03

v = -29.51 m/s

The negative sign indicates that the final velocity is in the opposite direction to the initial velocity (upward). However, since we were only asked for the speed (not velocity), we can take the absolute value of the answer to get:

|v| = 29.51 m/s

Therefore, the ball is going approximately 29.51 m/s when it hits the ground below.

A. The value of x in the given circular geometry is determined as 9.75.

The value of x can be calculated by applying the following rules of geometry as shown below.

angle AC = angle at the center

angle at center = twice angle at circumference

147 = 2(6x + 15)

147 = 12x + 30

147 - 30 = 12x

117  = 12x

x = 117/12

x = 9.75

Thus, the value of x in the given circular geometry is determined as 9.75.

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Answer: 100n

Explanation: 1+1=2

Answer:

the correct options are A and B.

Explanation:

The two main benefits which the scientists have using a diagram to model the water cycle are it can show changes that occur in many different parts of the Earth at the same time and it can also be used to show how the parts of the cycle relate to one another

Explanation:

\(from \: einstein \: equation : \\ E = m {c}^{2} \\ E = 1.5 \times {(3 \times {10}^{8} )}^{2} \\ E = 1.35 \times {10}^{17} \: joules\)

According to Myers-Briggs, a charcteristic that is common to judging is  liking things settled and organized.

The term judging has to do with the quest for order and organization. It is one of the personality traits as outlined by Myers-Briggs.

The characteristic that is common among the people that exhibit the judging personality trait is liking things settled and organized.

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Answer:likes to have things settled and organized

Explanation:

bc I just took the test so ik it’s right

Fan made of plastic bottle is an innovative way to reuse plastic bottles and can be easily made at home. This can be done by following simple steps, and a few materials are required to make it. The fan can be created by using a plastic bottle, scissors, string, a ruler, and a marker.

First, the bottle needs to be cut into half, and the upper part needs to be cut into three equal sections, then fold each section to make a blade. With the help of a ruler and marker, make a mark on each section, then make a hole in the center of each blade. Insert a string through the holes and tie the ends of the strings. The fan is ready to use by holding the string and swinging it back and forth.

The use of plastic bottle fans can significantly reduce the number of plastic waste and provide a practical solution to avoid environmental pollution. Besides, it is easy to make, and the materials are readily available, which can be used for various occasions, such as picnics, camping, or any outdoor activities.

In conclusion, the creation of a fan made of plastic bottle with string is an excellent way to reuse plastic bottles and can be made with simple steps. This project encourages everyone to contribute to environmental protection by utilizing what is available at home and reducing the number of plastic wastes.

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Answer:

Kinetic energy.

The explanation never existed

Answer: Kinetic Energy

The time elapsed between the first splash and the second splash is approximately 0.69 seconds.

To calculate this, we consider the motion of two rocks thrown simultaneously from a bridge. Heather throws a rock straight down with a speed of 14 m/s, while Jerry throws a rock straight up with the same speed.

We use the equation for displacement in uniformly accelerated motion: s = ut + (1/2)at^2.

For Heather's rock, which is thrown downwards, the initial velocity (u) is positive and the acceleration (a) due to gravity is negative (-9.8 m/s^2). The displacement (s) is the height of the bridge (46 m).

Solving the equation, we find two possible values for the time (t): t ≈ -4.91 s and t ≈ 1.91 s.

Since time cannot be negative in this context, we discard the negative value and consider t ≈ 1.91 s as the time it takes for Heather's rock to hit the water.

For Jerry's rock, thrown upwards, we use the same equation with the same initial velocity and acceleration. The displacement is also the height of the bridge, but negative.

Solving the equation, we find t ≈ -5.68 s and t ≈ 1.22 s. Again, we discard the negative value and consider t ≈ 1.22 s as the time it takes for Jerry's rock to reach its maximum height before falling back down.

To find the time difference between the first and second splash, we subtract t ≈ 1.91 s (Heather's rock) from t ≈ 1.22 s (Jerry's rock). This gives us a time difference of approximately 0.69 seconds.

Therefore, the time elapsed between the first splash and the second splash is approximately 0.69 seconds.

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1. Of the nine strategies for making ethical decisions, Evaluate the alternatives stands out for me because I want to consider alternative outcomes.

2. When I must choose to lie for personal gain or say the truth for the benefit of others.

3. To handle the various ethical situations that arise in their job.

An ethical situation is a situation in which an individual must choose between two possible often conflicting choices which in themselves may not be unlawful.

Our choices in an ethical situation is as a result of the individual's moral compass- a set of moral beliefs we use to guide our choices in ethical situations.

1. Based on the nine strategies for making ethical decisions, the one that stands out for me is Evaluate the alternatives.

This strategy stands out for me because I want to consider alternative outcomes.

2. Evaluating the alternatives can be applied in my life when I must choose to lie for personal gain or say the truth for the benefit of others.

3. Employers seek employees with strong ethical reasoning abilities because they are able to handle the various ethical situations that arise in their job.

In conclusion, ethical situations require good ethical decision making.

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We can use the formula:

velocity = distance / time

To find the velocity of the supersonic jet.

The distance traveled by the jet is 1,000 kilometers, and the time taken is 0.5 hours. So:

velocity = 1,000 km / 0.5 hours

velocity = 2,000 km/hour

Now, we need to find the velocity of the airplane that the jet passed during its flight. The airplane's velocity is given as 903 km/hour.

Since the jet and the airplane were traveling in opposite directions, we can add their velocities to find the relative velocity between them:

relative velocity = velocity of jet + velocity of airplane

relative velocity = 2,000 km/hour + 903 km/hour

relative velocity = 2,903 km/hour

So, the velocity of the supersonic jet is 2,000 km/hour.

Answer:

Because that is how God created things

Explanation:

The acceleration of the object is 11.11 m/\(s^2\) (approximately).

The rate of change of velocity of a body with respect to time is known as acceleration. Due to having both magnitude and direction, it is a vector quantity having SI unit m/s^2.

Given parameter,

The mass of the object, m = 45 Kg.

Net force acting on the object, F = 500 N.

Acceleration of the object, a= ?

From Newton's 2nd law of motion,

Force = mass × acceleration

⇒ F = ma

⇒ a = F/m

= 500 N /45 Kg

= 11.11 m/s^2. (approximate)

Hence, the approximate value of acceleration of the object, a = 11.11 m/s^2.

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Radius of the planet has the greatest influence on the width of the light curve of a transiting planet.

"Radius is a straight line from the centre to the circumference of a circle or sphere."

"Planets are the largest objects in the solar system after the Sun."

"A light curve is a graph of light intensity of a celestial object or region, as a function of time."

"A transit occurs when a planet passes between a star and its observer."

According to Kepler, size of the planet is proportional to how much light is blocked . Hence , more deeper the transits are , more the size of the planet will be. This implies radius has the greatest influence on the width of the light curve of a transiting planet.

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Answer:

ITS A

ebnjhgfdfghj

Answer:

A.

Explanation:

Because the force of gas is pushing the rocket upward, while the force of gravity is trying to keep the rocket on the ground. (I'm sorry if this is wrong, I haven't been learning about Newton very much recently XD. But based on general knowledge and Google, I'm confident this is correct.)

Answer:

After it started, the fireball went up and then fell back down. These are my own words if you would like the example off of Edmentum here it is: After the launch, the fireball moves upward, then it falls back down to Earth.

Explanation:

Hope this helps if anyone needs it! :)

Exact answer:

After the launch, the fireball moves upward, then it falls back down to Earth.

Answer:

La energía potencial elástica es la energía asociada con los materiales elásticos. Por ejemplo, un resorte al ser comprimido o elongado almacena energía potencial elástica y, al ser soltado, puede realizar trabajo sobre un objeto.

Para mantener el resorte comprimido o alargado una cierta longitud x, a partir de su largo natural, es necesario que, en este caso, la mano aplique una fuerza F_{M} sobre el resorte; esta fuerza es directamente proporcional a x.

Explanation:

ón conocida como ley de Hooke.

Para encontrar una expresión que describa la energía potencial asociada con la fuerza del resorte, se determina el trabajo que se requiere para comprimir el resorte desde su posición de equilibrio hasta cierta posición final arbitraria x. Debido a que la fuerza varía desde O hasta kx, se utiliza la fuerza promedio \frac{(F_{0}+F_{X})}{2}.

 \[ \bar{F}=\frac{0+K X}{2}=\frac{1}{2}kx \]

fuerza-sobre-un-resorte

Fuerza sobre un resorte. La fuerza para estirar un resorte aumenta linealmente con su elongación .

El trabajo realizado por la fuerza aplicada será: W=\bar{Fx}=\frac{1}{2}kx^{2}

El trabajo realizado se almacena en el resorte comprimido en forma de energía potencial elástica como:

 \[ \boxed{ Ep_{elas}=\frac{1}{2}kx^{2}} \]

Una vez que se ha comprimido o estirado el resorte respecto a su posición de equilibrio, la energía potencial elástica se puede considerar como la energía almacenada en el resorte deformado. Esta energía siempre es positiva en un objeto deformado al depender de x^{2}.

Por ejemplo, en la figura se observa que un resorte realiza trabajo sobre un bloque. El resorte que se encuentra sin deformar (a) cuando es empujado por un bloque de masa m, se comprime una distancia x (b). Cuando el bloque se suelta (c), partiendo del reposo, la energía potencial plástica almacenada en el sistema se transforma en energía cinética del bloque.

energia-potencial

Answer: thermal conductivity

The difference in the rate at which these two materials transfer thermal energy throughout the cups is known as thermal conductivity.

It is the rate where the heat is to be transferred from conduction via the cross section area of the unit with respect to the material at the time when the temperature should be gradient and existed with the perpendicular to the area.

Also, in this, two material is to be transferred via the thermal energy with the help of cups.

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Answer: i don’t know the answer but

Explanation:

Divide the distance by the speed. That gives the travel time.

t = d/v = (4200 km) / (800 km/hr) = ? hrs