An object accelerates uniformly from rest for t seconds. The average speed for this time interval is

Answer:

S = Vo t + 1/2 g t^2     where g is in opposite direction to Vo

564.2 = 225 t - 4.9 t^2

4.9 t^2 - 225 t + 564.2 = 0

t^2 - 45.92 + 115.1 = 0       quadratic equation

t = 2.665       one solution

Check:

225 * 2.665 - 4.9 * 7.102 = 564.8      would need more significant figures for exact match

Answer:

The answer would be 91.9 or 91.8635

Hope this helps

A driver sees a boy and his dog on the road, and it takes the driver 0.50 seconds to put on the brakes, If the car travels 14 meters during that time, the velocity of the car would have been 56 m/s,

There are three equations of motion given by  Newton

The first equation is given as follows

v = u + at

the second equation is given as follows

S = ut + 1/2×a×t²

the third equation is given as follows

v² - u² = 2×a×s

As given in the problem a driver sees a boy and his dog on the road, and it takes the driver 0.50 seconds to put on the brakes, If the car travels 14 meters during that time,

t = 0.5 s , s = 14 m

By using the first equation of the motion,

v = u+at

0 = u+a×0.5

a = -2u m/s²

Now by using the second equation of motion,

s = ut+1/2at²

By substituting t=0.5 and a = -2u m/s² in the equation ,

14 = u/2-u/4 = u/4

u = 56 m/s

Thus, the velocity of the car would have been 56 m/s,

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Answer:

During charging by conduction, both objects acquire the same type of charge. If a negative object is used to charge a neutral object, then both objects become charged negatively. ... In this case, electrons are transferred from the neutral object to the positively charged rod and the sphere becomes charged positively.

Answer:

starch into simple sugars

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The surface of planet X where the acceleration due to gravity is 3.5 m/s2 and there is no atmosphere: The speed of the hammer after 8.0 s is 0 m/s.

When the hammer is thrown upward, it experiences the acceleration due to gravity acting in the opposite direction of its motion. In this case, the acceleration due to gravity on planet X is 3.5 m/s².

As the hammer moves upward, its velocity decreases due to the opposing acceleration until it comes to a momentary stop at the highest point of its trajectory. At this point, the hammer momentarily changes its direction and starts to fall back down.

Since the hammer reaches its highest point and comes to a stop after a certain time, its upward motion stops and it starts to fall downward. Thus, after 8.0 seconds, the hammer will have reached its highest point and started to descend, with a velocity of 0 m/s.

Therefore, the speed of the hammer after 8.0 s is 0 m/s.

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Answer:

(C)

Explanation:

its C ok

The transition that will lead to the emission of light with longer wavelengths is n = 3 to n = 2. The correct option is c.

The largest energy change, and hence the shortest wavelength, x nm, would occur during the transition from the highest to the lowest energy levels. When an electron moves from the n = 5 to the n = 1 level, an atom emits yellow light.

The Bohr model of the atom is named for Niels Bohr, who created a model of the electron in which electrons were arranged into energy levels using observations of atomic spectra.

Because electrons can only exist in the energy levels and not in the intermediate states, they must absorb or emit a certain amount of energy to change energy levels.

Therefore, the correct option is c. n = 3 to n = 2.

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The question is incomplete. Your most probably complete question is given below:

a. n = 1 to n = 3

b. n = 4 to n = 3

c. n = 3 to n = 2

d. n = 3 to n = 1

e. n = 2 to n = 3

We are asked to determine the net rate of radiation of a roof given its area and its emisivity. To do that we will use the following formula:

Where:

The Stefan-Boltzmann's constant is given by:

Now, we need to convert the temperature to Kelvin. To do that we use the following:

Where:

For the 33°C we have:

For the 14°C:

Now, we substitute the values:

Solving the operation:

Therefore, the net rate of radiation is -27870.84 Watts.

The displacement of the object is determined as 3.0 m.

The displacement of an object is the change in the position of the object.

displacement = Δx = xf - xi

where;

Δx = xf - xi

Δx = 8.0 m - 5.0 m

Δx = 3.0 m

Thus, the displacement of the object is determined as 3.0 m.

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Answer:

The average densities of both matches the expected density for objects made from water ice.

Explanation:

Charon's density is 1.2 to 1.3 g / cm3, while Pluto's density is 1.8 to 2.1 g / cm3. This was discovered in many researches and measurements of these two celestial bodies, with the objective of understanding them and promoting efficient scientific knowledge.

With the measurements of the average densities between pluto and Charon it was possible to conclude several statements about them. Firstly, it is possible to see that the two formed independently and at different times, in addition to indicating the existence of few rocks in charon, which is consistent with the average density of objects made mostly of water ice.

Answer:

A

Explanation:

In a wave phenomenon, energy can move from one location to another, yet the particles of matter in the medium return to their fixed position. A wave transports its energy without transporting matter.

Answer:

36km/h

Explanation:

since the acceleration of the train was 0.5m/s² i.e it is constant . since the acceleration is constant you can use one of the "SUVAT" equations to find the answer.

the equation that best fits this question is: v²=u² + 2āS.

v stands for final velocity

u stands for intial velocity

v²=u² + 2āS since the car started from rest the intial velocity is zero.

v²=u² + 2āS

v²= 0 + 2(0.5m/s²)*100m

v²= 1m/s²*100m

√v²=√100m²/s²

v=10m/s

1km/hr = 1/3.6m/s

x. = 10m/s.

use criss cross method to find the value of x

x=( 1km/hr* 10m/s)

1/3.6m/s

x= 36km/hr

The range or distance before and behind the main focus with relatively sharp objects is called depth of field.

In photography, the term used to describe the range or distance in front of and behind the main focus of a shot, within which objects appear relatively sharp and clear, is known as the depth of field.

It refers to the area in the image that is in acceptable focus and contributes to the overall composition and visual impact of the photograph.

The depth of field is influenced by various factors, including the aperture setting, the focal length of the lens, the distance between the camera and the subject, and the camera's sensor size.

By adjusting these parameters, photographers can control and manipulate the depth of field to achieve specific creative effects. For example, a shallow depth of field can be used to isolate the main subject and create a blurred background, while a deep depth of field can ensure that objects in both the foreground and background appear sharp.

Understanding and effectively utilizing the concept of depth of field is essential for photographers to achieve their desired artistic and storytelling goals.

It allows them to control the visual emphasis, direct the viewer's attention, and create a sense of depth and dimension within the image.

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Clear question is;

An ideal gas is enclosed in a piston-cylinder apparatus with the piston being freely movable. Given that ΔE is positive and ΔH is negative following a process,

pick one

A) the system absorbs heat and expands during the process.

B) the system absorbs heat and contracts during the process.

C) the system loses heat and expands during the process.

D) the system loses heat and contracts during the process.

E) the system loses heat but neither expands nor contracts during the process.

Answer:

Option A is correct.

Explanation:

In thermodynamics, when the change in energy which is ΔE of a system is positive, it means that the system is undergoing an endothermic process. An endothermic process is simply one where heat is absorbed from the surroundings

Now, when change in enthalpy which is ΔH is negative, it means that it's an exothermic reaction. Exothermic means it releases heat to the surroundings. This means work is positive because the system does work on the surroundings. Thus it will expand.

So the correct answer is;

heat is absorbed from the surroundings and will expand during the process.

The strength of the magnetic field is approximately 9.53 × 10^-3 T (Tesla).

The magnetic force experienced by a charged particle moving in a magnetic field can be calculated using the equation:

F = q * v * B * sin(θ),

where F is the magnetic force, q is the charge of the particle, v is its velocity, B is the strength of the magnetic field, and θ is the angle between the velocity vector and the magnetic field.

In this case, the particle has a charge of 2.7 μC (2.7 × 10^-6 C), a velocity of 773 m/s, and experiences a magnetic force of 5.75 × 10^-3 N.

Rearranging the equation, we can solve for the strength of the magnetic field:

B = F / (q * v * sin(θ)).

Assuming the angle between the velocity vector and the magnetic field is 90 degrees (sin(90) = 1), the calculation becomes:

B = (5.75 × 10^-3 N) / (2.7 × 10^-6 C * 773 m/s).

Evaluating the expression, the strength of the magnetic field is approximately 9.53 × 10^-3 T (Tesla).

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Answer:

Vector, in physics, a quantity that has both magnitude and direction. It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity's magnitude. Although a vector has magnitude and direction, it does not have position

Explanation:

300m÷60s=5m/s

hope this can help maybe

The total weight of screws and nails that Henry bought to build the skate board ramp is 13/20 pounds.

To find the total weight of screws and nails, we need to add the weight of the screws and the weight of the nails.

Henry bought 1/4 pound of screws and 2/5 pounds of nails, so

Total weight = 1/4 + 2/5 pounds

Total weight = (1 x 5)/(4 x 5) + (2 x 4)/(5 x 4) pounds

Total weight = (5/20) + (8/20) pounds

Now that both fractions have the same denominator, we can add them together,

Total weight = 13/20 pounds

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--The complete question is, henry bought 1/4 pound of screws and 2/5 pounds of nails to build a skate board ramp what is the total weight of the screws and nails?--

If the tension is doubled, the new wave speed on a string under tension is approximately 325.27 m/s.

When the tension is doubled, the wave speed on a string under tension becomes twice its previous value. The wave speed on a string under tension is directly proportional to the square root of the tension. This is according to the wave equation.

Here is how to determine the new wave speed if the tension is doubled on a string under tension, given that the wave speed on the string is 230 m/s.

First, we can use the wave equation to determine the wave speed of a string under tension.

It is given as V = √(T/μ)

Where T is the tension, μ is the mass per unit length, and V is the wave speed.

If T doubles, then the new tension will be 2T and the new wave speed will be V1.

Thus,V1 = √((2T)/μ)

= √(2(T/μ))

= √2(√(T/μ))

= √2(V)

The new wave speed V1 is equal to √2 times the original wave speed V.

Thus, the new wave speed is;

V1 = √2(V)

= √2(230)

= 325.27 m/s

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The linear acceleration of the disk is \(8.17 m/s^{2}\).

We know that, a rotating disk has two acceleration:

                       Radial acceleration (\(a_{r}\)) = ω^2 * r  and  

                       Tangential acceleration\((a_{t} )\) = \(\alpha r\)

where ω = angular velocity

           \(\alpha\) = angular velocity

           r = radius

Given, ω = 4 m/s , \(\alpha\) = 3.4 \(m/s^{2}\) , r = 0.5m

Putting these values in above equation we get

           \(a_{r} = 8 m/s^{2} \\a_{t} = 1.7 m/s^{2}\)

The linear acceleration is given by:

           \(a = \sqrt{a_{r} ^{2} + a_{t} ^{2} }\)

Putting respected values in above equation we get a = 8.17 \(m/s^{2}\).

So the linear acceleration of the disk is \(8.17 m/s^{2}\).        

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Driving at 100 km/h (62 mph) would require 3.3 minutes to cover the distance required to breathe air.

The breathable atmosphere has a 6 km thickness.

The closest approximation is A: speed=100 km/h; time=thickness/speed=6 / 100; 0.06 hours; 3.6 minutes.

The air's oxygen content declines as the temperature rises.

Around 5.15 x 1018 kg of the atmosphere's mass is located within 11 km (6.8 mi; 36,000 ft) of the surface. With altitude comes a thinning of the atmosphere, yet there is no clear separation between it and space. As the boundary between the atmosphere and outer space, the Kármán line, at 100 km (62 mi) or 1.57% of the radius of the Earth, is frequently employed. When a spacecraft enters the atmosphere for the second time, atmospheric effects become apparent at an altitude of around 120 km (75 mi). Based on elements like temperature and composition, different levels of the atmosphere can be identified.

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Answer:

B

Explanation:

Forces are pushes or pulls. They can be balanced or unbalanced. If unbalanced they can change the shape of objects and change the way they are moving (speed-wise)

Answer:

Acceleration = Final velocity - initial velocity / time take

65-35=30 , 30/5=6

Acceleration = 6m s-2

Explanation:

The magnitude of the change in momentum is therefore 6.12 kg*m/s, and the direction is downward and the floor exerts an average net force of 51 N upward on the ball during the collision.

(a) To find the magnitude and direction of the ball's change in momentum, we need to first find the initial and final momenta of the ball. The initial momentum is given by:

\(p_i = m*v_i\)

where m is the mass of the ball, and \(v_i\) is the initial velocity of the ball before it hits the floor. Substituting the given values, we get:

\(p_i\) = (0.60 kg)(6.0 m/s) = 3.6 kg*m/s

The final momentum is given by:

\(p_f = m*v_f\)

where \(v_f\) is the velocity of the ball after it rebounds from the floor. Substituting the given values, we get:

\(p_f\)= (0.60 kg)(-4.2 m/s) = -2.52 kg*m/s

Note that the negative sign indicates that the direction of the final momentum is opposite to that of the initial momentum.

The change in momentum is given by:

Δp = \(p_f - p_i\)

Substituting the calculated values, we get:

Δp = -2.52 kgm/s - 3.6 kgm/s = -6.12 kg*m/s

The magnitude of the change in momentum is therefore 6.12 kg*m/s, and the direction is downward.

(b) To find the average net force that the floor exerts on the ball, we can use the impulse-momentum theorem:

Δp = \(F_avg\) * Δt

where Δt is the time duration of the collision. Substituting the calculated value of Δp and the given value of Δt, we get:

-6.12 kg*m/s = \(F_avg\) * 0.12 s

Solving for \(F_avg\), we get:

\(F_avg\) = -6.12 kg*m/s / 0.12 s = -51 N

Note that the negative sign indicates that the direction of the average net force is opposite to that of the change in momentum, i.e., upward. Therefore, the floor exerts an average net force of 51 N upward on the ball during the collision.

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Answer:

B. Obtaining Wind does not harm the environment, but Obtaining coal does

Explanation:

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

Answer:

Obtaining

Explanation:

VERY VERY biased question and answers....

 Wind turbines do significant damage to the environment.....from all of the mining required to obtain rare earth metals for the generator magnets to the non-recyclable blades to the enormous amounts of concrete required in pedestal construction ( mega - co2 emissions to make the concrete) to the transportation costs to the construction site  .   The also kill a significant number of birds and bats  AND contribute to noise pollution.  They ALSO require significant investment/costs/construction of transmission lines across the land to get from where the wind is to where the electricity is used.....  They are NOT great....but I think the answer they want you to spout is the second one.    But do not be brainwashed into believing they can replace fossil fuels.

Answer:

b

Explanation:

In order to get a stone slab to move, one would have to apply force to it. This can be done in a number of ways, depending on the situation. Here are a few possible laws that could be proposed for moving a stone slab:1. Newton's first law of motion: This law states that an object at rest will stay at rest unless acted upon by an external force. Therefore, to move a stone slab, one would need to apply a force to it.

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The temperature of the gas will increase due to the direct relationship between volume and temperature in accordance with Charles's Law.

According to the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature. When the pressure of a given mass of gas is kept constant and the volume increases, we can observe the effect on temperature.

In this scenario, the gas is considered ideal, meaning it follows certain assumptions such as negligible intermolecular forces and volume occupied by gas particles. According to Charles's Law, which states that the volume of an ideal gas is directly proportional to its temperature (assuming pressure remains constant), if the volume increases, the temperature will also increase.

This relationship can be understood by considering the behavior of gas particles. As the volume expands, the gas particles have more space to move around, resulting in an increase in their kinetic energy. This increase in kinetic energy corresponds to an increase in temperature, as temperature is a measure of the average kinetic energy of gas particles.

In conclusion, for an ideal gas of a given mass, if the pressure remains constant and the volume increases, the temperature of the gas will also increase according to Charles's Law.

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The resultant vector C' is 3i - 4.5k.

To calculate the cross product C = A × B, we can use the formula:

C = |i j k |

|Ax Ay Az|

|Bx By Bz|

Given that A = 3x + 2y - 12 and B = -1.5x + 0y + 1.5z, we can substitute the components of A and B into the cross product formula:

C = |i j k |

|3 2 -12|

|-1.5 0 1.5|

Expanding the determinant, we have:

C = (2 * 1.5 - (-12) * 0)i - (3 * 1.5 - (-12) * 0)j + (3 * 0 - 2 * (-1.5))k

C = 3i - 4.5k

Therefore, the resultant vector C' is 3i - 4.5k.

The y-component is zero because the y-component of B is zero, and it does not contribute to the cross product.

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