A ball is thrown upward at time t=0 from the ground with an initial velocity of 18 m/s (~ 40 mph). what is the total time it is in the air? assume that g = 10 m/s2.

Answer:

Explanation:

the diagonal of the rectangular plot of land  can be found using Pythagoras theorem (the diagonal is the hypotenuse)

Given

length of land x= 48m

width of land y= 20m

digonal z= ?

\(z^2= x^2+y^2\\\\z=\sqrt{ x^2+y^2} \\\)

substituting the values of x and y into the equation we can solve for z

\(z=\sqrt{ 48^2+20^2} \\\\z=\sqrt{ 2304+400} \\z=\sqrt{ 2704} \\z=52m\\\)

The diagonal is 52m

Hence since the interval = 22m the number if treee is

\(\frac{52}{22} = 2.36\\\)

The number of trees must be whole numbers , the number of tree is 2

Answer:

A

Explanation:

Trust me I just took it !

Answer:This is the Difference Between a Hypothesis and a Theory. ... In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data.

Explanation:

Charge-coupled devices (CCDs) are electronic imaging sensors that are widely used in digital cameras, telescopes, and other imaging devices. Some of the major advantages of CCDs over other imaging techniques include:

High sensitivity: CCDs are highly sensitive to light, allowing them to capture clear and detailed images even in low-light conditions. This makes them ideal for applications such as astrophotography and microscopy, where light levels are often very low.

Low noise: CCDs produce very little electronic noise, which means that images captured using CCDs tend to be very clean and free of unwanted artifacts. This makes CCDs particularly well-suited for scientific imaging applications, where accuracy and precision are critical.

High resolution: CCDs can capture images with very high spatial resolution, allowing them to resolve fine details in images. This makes them ideal for applications such as digital microscopy, where the ability to capture and analyze fine details is essential.

Overall, CCDs offer a powerful combination of high sensitivity, low noise, and high resolution that makes them well-suited for a wide range of imaging applications, from scientific research to artistic photography.

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The order of convergence of the Newton-Raphson method is 2nd order. Option A is the correct answer.

The Newton-Raphson method is an iterative root-finding algorithm commonly used to approximate the solutions of nonlinear equations. It exhibits a second-order convergence, which means that the number of correct digits doubles with each iteration. This rapid convergence is advantageous as it leads to faster convergence rates compared to methods with lower orders.

The second-order convergence is achieved by using the local linear approximation of the function near the solution and iteratively updating the approximation to approach the actual root. However, it's important to note that the convergence may be affected by the choice of initial guess and the behavior of the function itself, particularly in cases with multiple roots or near-singular points.

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The thickness of the shifter is given as t = λ / 2n.

The given equation of the phase of light of wavelength λ traveling through a shifter with a refractive index n is given by: Øs = 2πntλ-1, where t is the thickness of the shifter.

The phase of the same light wave traveling through air for a distance equal to t is Øa= 2ntλ-1.

We are supposed to derive an expression for the thickness of the shifter as a function of λ and n to get a phase shift of 180°.

Given, The phase of light of wavelength λ traveling through a shifter with a refractive index n is given by: Øs = 2πntλ-1

The phase of the same light wave traveling through air for a distance equal to t is Øa = 2ntλ-1

To obtain a phase shift of 180°, we have: Øs - Øa = πi where i is an integer.

Substituting the value of Øs and Øa in the above expression, we have:

2πntλ-1 - 2ntλ-1 = πi2πntλ-1 - 2ntλ-1

                         = π(2nλt) / λ2πntλ-1

                         = 2nλt / λπt

                         = λ / 2n

Hence, the thickness of the shifter is given as t = λ / 2n.

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The speed of the river is 0.5 Km/hr

Let X be the speed of the boat.

Let Y be the speed of the river.

Downstream speed

X - Y = 4

Upstream speed

X + Y = 5

By solving, we get

2X = 9

X =  4.5 Km/hr

Y =  0.5Km/hr

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Simple machines make work easier but do not reduce the amount of work required to complete the task.

1. Putting a motorcycle into the back of a trailer: The use of a ramp (inclined plane) would make it easier to roll the motorcycle up the ramp and into the trailer, reducing the amount of force required to lift it.

2. Lifting a flag to the top of the flagpole: A pulley can be used to lift the flag to the top of the flagpole. This reduces the amount of force needed to lift the flag, as the pulley allows the force to be spread out over multiple strands of rope.

3. Moving dirt from the front yard to the backyard: A wheelbarrow (lever) can be used to move the dirt. The wheel makes it easier to move the dirt by reducing the amount of force needed to lift and move it.

4. Attaching two boards together: A screw (inclined plane) can be used to attach the two boards together. The screw reduces the amount of force needed to attach the boards by allowing the user to turn the screw rather than apply a direct force.

5. Splitting a log in half: A wedge can be used to split the log in half. The wedge allows the user to apply a greater force over a smaller area, making it easier to split the log.

6. Cutting paper: A pair of scissors (lever) can be used to cut the paper. The scissors make it easier to cut the paper by reducing the amount of force needed to cut through it.

7. Lifting a car to change the tire: A hydraulic jack (hydraulic system) can be used to lift the car to change the tire. The hydraulic system allows the user to apply a smaller force to lift the car by using the pressure of a fluid to increase the force.

8. Moving from the bottom floor of the house to the top floor: A staircase (inclined plane) can be used to move from the bottom floor to the top floor. The staircase reduces the amount of force needed to move vertically by spreading out the force over a longer distance.

9. Opening a can of peaches: A can opener (lever) can be used to open the can of peaches. The can opener makes it easier to open the can by reducing the amount of force needed to puncture and remove the lid.

10. Cutting a piece of cheese: A knife (wedge) can be used to cut the cheese. The wedge shape of the knife allows the user to apply a greater force over a smaller area, making it easier to cut through the cheese.

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Answer:

Explanation:

There are three states of matter; solid, liquid and gaseous states.

The solid state of matter has it's particles tightly packed with very restricted  or no movement within the molecule hence the reason for it's definite shape.

The liquid state of matter has it's particles with a free movement (better than solid but not as free as gases) within the molecule hence it's particles are loosely packed within the molecule. Hence, they (liquids) assume the shape of the container in which they are stored and they move freely when released from the container.

The gaseous state of matter has it's particles totally loosely packed as a result of it's particles moving freely and colliding against one another.

Thus, we can use the above descriptions to answer the statements from the question.

1) The atoms in a  ----- are closely packed, but able to slide past each other. Answer: From the description above, it can be deduced that the atoms here are in a solid because the particles within a solid are closely packed.

2) The atoms in a  -------- spread as far apart as possible.

Answer: The atoms here are in gaseous form because, as described earlier, they are loosely packed and  can thus be as far apart as possible.

3) A  ----- has a definite shape and volume.

Answer: As described earlier, a solid substance would have a definite shape and volume because it's particles are tightly packed.

4) The shape of a  ----- can change, but the volume is definite.

Answer: The substance here is a liquid because the particles are free (but not as free as gases) and would have a definite volume but will assume the shape of the any container they are placed in (hence they have an irregular shape).

Answer:

The atoms in a

✔ liquid

are closely packed, but able to slide past each other.

The atoms in a

✔ gas

spread as far apart as possible.

A

✔ solid

has a definite shape and volume.

The shape of a

✔ liquid

can change, but the volume is definite.

Explanation:

Answer:

According to Newton's third law of motion, the reaction force is equal to the action force.

Explanation:

Newton's third law of motion states that for every action there is an equal and opposite reaction. This means that if one object exerts a force on a second object, the second object exerts an equal force in the opposite direction. When Plate X pushes on Plate Y with the action force (Fx), Plate Y must push back with an equal force (Fy).

Therefore, the best explanation is that according to Newton's third law of motion, the reaction force is equal to the action force.

For every action, there has equal and opposite reaction - this statement best describes the action and reaction forces on the plates.

As a result of this interaction, there are two forces: one from plate X and one from plate Y. The third law of motion of Newton deals with these two forces, which are referred to as action and reaction forces. Newton's third law is officially expressed as follows: There is an equal and opposite reaction to every action.

The implication of the statement is that there are always two forces acting on the two interacting objects. The force acting on the first object is equal in size to the force acting on the second. The force acting on the first object is acting in the opposite direction to the force acting on the second object. Force pairs—equal and opposing action-reaction force pairs—always exist in pairs.

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Answer:

C is the correct answer.

Explanation:

we have given about light and we have to compare the speed of light in air as well as in glass. So let's take the expression of refractive index of glass. Suppose we are representing a refractive index of glass with respect to air. So this will be equal to the fraction or the ratio of the speed of light in air divided by the speed of light in glass. Hence we get the expression in the modified form as speed of light in glass is equal to speed of light in air, divided by the refractive index of glass with respect to air. So obviously when we consider the refractive index of class with respect to air, it is a number which is more than one. Hence from equation number A we get that the speed of light in glass will be less than that speed of light in air. Hence we can get it the correct answer. As the choice number C means the answer is less. This is our final answer.

Thank you.

The potential difference across the ends of a wire is doubled in magnitude. If ohm’s law is obeyed, the resistance is not changed. Thus, option A is correct.

The current is the stream of charges which flow inside the conductors when connected across the end of voltage.

From Ohm's law, V =IR

Here, R is the proportionality constant called the resistance of the resistor.

The complete question is given in the image attached.

The potential difference across the ends of a wire is doubled in magnitude.2V = IRR =2 V/IAs, the resistance is a constant value, it does not change.

The following statements concerning the resistance of the wire true is :

The resistance is not changed

Thus, the correct option is A.

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Answer:

mass is in kg and velocity is in m/s for the answer to be in Joules

Explanation:

Answer:

acceleration = final velocity - initial velocity / time

V-U/T

Explanation:

Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt.

Answer:

2.45 x 10^-2

Explanation:

All numbers in scientific notation or standard form are written in the form

m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.

To convert 0.0245 into scientific notation, follow these steps:

Step 1) Move the decimal 2 times to right in the number so that the resulting number, m = 2.45, is greater than or equal to 1 but less than 10

Step 2) Since we moved the decimal to the right the exponent n is negative

n = -2

Step 3) Write in the scientific notation form m × 10n

= 2.45 × 10-2

Therefore,

2.45 × 10-2 is the scientific notation form of 0.0245 number and 2.45e-2 is the scientific e-notation form for 0.0245

Here are some examples of decimal to scientific notation calculator

Answer:

C. Alkynes

Explanation:

It is false that the vector u results when a vector u-v is added to the vector v.

The basic definition of the vector it that it is any physical quantity that has a magnitude as well as direction and it follows vector laws of addition. i.e. Parallelogram law of vector addition or triangle law of vector addition.

Now, it is stated that the vector u results when a vector u-v is added to the vector v, this statement may or may not be true because we cannot be certain about it. Because we do not know the direction of the two vectors u and v. This is why we conclude that the statement is false.

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im pretty sure is a?

Explanation:

non given you awnser only

Answer:

Bump

Explanation:

Also called the forearm pass; An underhand pass hit with your forearms when the ball is below your shoulders; used to receive the serve.

Answer:

Explanation:

\(a = \frac{v_f-v_0}{t}\) which is the final velocity minus the initial velocity in the numerator, and the change in time in the denominator.  For us:

\(a=\frac{2.7-1.6}{1.2}\) so

a = .92 m/s/s (NOT negative because you're speeding up)

Two situations in which light behaves like a wave are diffraction and interference. The two situations in which light behaves like a particle photoelectric effect and Compton scattering.

Two situations in which light behaves like a wave are:

Diffraction: When light waves pass through an opening or around an obstacle, they bend and spread out, creating a pattern of bright and dark regions. This phenomenon is known as diffraction and is a characteristic property of waves.

Interference: When two or more light waves overlap, they can reinforce or cancel each other out, producing a pattern of bright and dark regions. This phenomenon is known as interference and is also a characteristic property of waves.

Two situations in which light behaves like a particle are:

Photoelectric effect: When light shines on a metal surface, electrons can be ejected from the surface. This phenomenon is known as the photoelectric effect and can be explained by the particle-like behavior of light, where light is considered to consist of discrete packets of energy called photons.

Compton scattering: When X-rays or gamma rays collide with matter, they can scatter off the particles in the matter, causing a decrease in energy and a change in the direction of the radiation. This phenomenon is known as Compton scattering and can also be explained by the particle-like behavior of light, where photons are considered to collide with the particles in the matter and transfer some of their energy to them.

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Answer:

if they both face each other they cancel out

Explanation:if there is one on 1 side and on the other as well they cancel out and it is 0

Answer:

If the forces are equal and the forces act in oppposite direction then the net force is equal to zero

Please find the attached photo for your answer. Hope it helps..

Answer:

4 km/hr

Explanation:

The computation of the actual velocity is shown below:

Because the path of its paddles is opposed to the current direction, the real velocity can be determined by deducting the current velocity to its velocity while paddling

So, the actual velocity is

= Upstream - downstream

= 19 km/hr - 15 km/hr

= 4 km/hr

As we can see it is in positive, so it is an upstream direction  

Answer:

since the direction of his paddles is opposite of the the direction of the current, so the actual velocity can be calculated by subtracting the velocity of current to to his velocity when paddling

v = 19 - 15

v = 4 since the answer is positive, then the direction is upstream

Explanation:

If the speed of an object does NOT change, the object is traveling at uniform speed.

Answer:

answer is uniform

Explanation:

The velocity of the cart is 19.8 m/s.

The velocity of the cart is calculated by applying the principle of conservation of energy as shown below;

P.E ( at the top) = K.E (at the bottom)

mgh = ¹/₂mv²

v = √ (2gh)

where;

The velocity of the cart is calculated as follows;

v = √ (2gh)

v = √ (2 x 9.8 x 20 )

v = 19.8 m/s

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Answer:

164

Explanation:

The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

Neutrons: 90

Mass number?

Atomic number of Tungsten: 74

90 + 74 = 164

Answer:

positive acceleration.

Explanation:

As its slowing down gradually, its positive acceleration. When the ball slows down, its acceleration vector is in the opposite direction of its motion. Therefore positive acceleration.