Problem
20. A toy car is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s. What is
the final velocity after 6.0 s?

It is important on diagrams to represent a force with an arrow because force is a vector quantity but it is not important to represent a mass since it is scalar quantity.

Vector quantities are always represented with arrows because they have magnitude and direction.

Scalar quantities have only magnitude, and cannot be represented with arrows.

Thus,  it is important on diagrams to represent a force with an arrow because force is a vector quantity but it is not important to represent a mass since it is scalar quantity.

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The net force required to horizontally accelerate a 90 kg person from rest to 66 m/s is  4596.3 N.

Acceleration is the rate of change of the velocity of an item with appreciation to time. Accelerations are vector quantities. The orientation of an item's acceleration is given by the orientation of the net pressure appearing on that object.

Given;

mass = 90 kg

initial velocity = 0

final velocity = 66 m/s

time = 1.3 sec

V = u + at

66 = 0 + a × 1.3

a = 66/1.3

a = 50.77 m/s²

F = ma

   = 90 × 50.77 N

   = 4596.3 N

Acceleration is the charge at which velocity modifications with time, in terms of each speed and route. A factor or an object moving in a straight line is accelerated if it quickens or slows down. movement on a circle is extended despite the fact that the rate is consistent because the course is continually changing.

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Answer:

270 m

Explanation:

d = depth

   waves must travel   down and back up  = 2 d

2d =  .40 s  * 1350 m/s

2d = 540 m

d=270m

The approximate TOD of the victim is Maybe around 4:30 pm.

The liver temperature can provide a more accurate representation of the genuine core body temperature, hence it is ideal to take the temperature either rectally or by monitoring the liver temperature.To do this, a tiny incision must be made in the right upper belly, and the thermometer must be inserted into the liver tissue.

This stiffening process, known as rigor mortis, occurs at a fairly known time, making it possible to predict when someone will pass away.In overall: If the body is warm and there is no rigidity, the time of death was less than three hours ago.If the body is stiff and warm, death happened 3 to 8 hours earlier.

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False

Virtual image cannot be caught on a screen

The pressure that is created within the blood vessels when the heart beats is called systolic pressure.

Systolic pressure refers to the maximum pressure exerted on the walls of the arteries when the heart contracts and pumps blood into the circulation. It is the higher number typically seen in blood pressure measurements, such as 120/80 mmHg.

During each heartbeat, the heart muscle contracts, pushing oxygenated blood from the left ventricle into the aorta, which is the largest artery in the body. This forceful ejection of blood generates a surge of pressure that travels through the arterial system, reaching smaller blood vessels and capillaries.

Systolic pressure is a vital measurement as it reflects the force required to deliver blood to various organs and tissues throughout the body. It is influenced by factors such as the strength of the heart's contraction, the volume of blood being pumped, the elasticity of the arterial walls, and the resistance encountered within the circulatory system. Monitoring and maintaining a healthy systolic pressure range are important for overall cardiovascular health.

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Simon's idea of placing a diffraction grating at a corner to bend light towards his eyes so that he could see the light coming from around the corner would not work.

The diffraction grating works to split a beam of light into its constituent colors based on the interference patterns created by the multiple slits that the beam passes through.

Therefore, if the diffraction grating was used at a corner, it would split the light into its constituent colors and not bend it towards Simon's eyes. Hence, Simon's idea is impossible.

Diffraction gratings work on a specific range of wavelengths, which means that Simon would not be able to see objects beyond that range. Diffraction gratings require a particular angle of incidence of the light beam.

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Jack and jill travel up a hill at a speed of 2 mi/h. They travel back down the hill at a speed of 4 mi/h. Their average speed for the entire trip is 8/3 mi/h

The average speed is the total distance traveled by the object in a particular time interval. The average speed is a scalar quantity

Let x be the distance of hill from one side.

⇒ Distance for round trip = 2x

Let t1 and t2 be the time taken by them when going and returning back respectively.

Total time taken for round trip = t1+ t2

we have,

speed = distance/ time

⇒time = distance/speed

so, t1 = x/2

t2= x/4

Average speed for round trip = total distance/ total time

\(average speed = \frac{2x}{ \frac{x}{2} + \frac{x}{4} } \)

= 8/3 mi/h

therefore, Their average speed for the entire trip is 8/3 mi/h.

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¡Hellow!

For this problem, first, lets convert the seconds in hours:

5,4x10³\(\rightarrow\) 5400

h = sec / 3600

h = 5400 s / 3600

h = 1,5

Let's recabe information:

d (Distance) = 386 km

t (Time) = 1,5 h

v (Velocity) = ?

For calculate velocity, let's applicate formula:

                                                    \(\boxed{\boxed{\textbf{d = v * t} } }\)

Reeplace according we information:

386 km = v * 1,5 h

v = 386 km / 1,5 h

v = 257,33 km/h

The velocity of the train is of 257,33 kilometers for hour.

Extra:

For convert km/h to m/s, we divide the velocity of km/h for 3,6:

m/s = km/h / 3,6

Let's reeplace:

m/s = 257,33 km/h / 3,6

m/s = 71,48

¿Good Luck?

The induced current in the loop will flow in a counterclockwise direction, as it opposes the change in magnetic flux and follows the right-hand rule.

To determine the direction of the induced current within the loop, we can use Lenz's Law and the right-hand rule.
Step 1: Lenz's Law states that the induced current will flow in a direction that opposes the change in magnetic flux through the loop. In this case, since the loop is being pulled to the right, the magnetic flux is decreasing.
Step 2: Using the right-hand rule, point your right thumb in the direction of the magnetic field (away from you). Then, curl your fingers in the direction of the loop's motion (to the right). The direction of your fingers curling indicates the direction of the induced current.
Based on these steps, the induced current in the loop will flow in a counterclockwise direction, as it opposes the change in magnetic flux and follows the right-hand rule.

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Answer:

a = 5 m / s²   and    x = 562.5 m

Explanation:

Let's apply the kinematics relations

          v = v₀ + at

          v² = v₀² + 2a x

In this case, as the car stops, its final speed is zero (v = 0) and the acceleration must be opposite to the speed, that is, negative

           0 = v₀ - a t

           a = v₀ / t

let's calculate

           a = 75/15

           a = 5 m / s²

let's look for the distance

           0 = v₀² - 2a x

           x = v₀² / 2a

let's calculate

           x = \(\frac{75^2}{2 \ 5 }\)

           x = 562.5 m

The symbol V in the given equation is explained by the quantity theory of money. Here, V denotes the velocity of money circulation.

The quantity theory of money helps to explain the relationship between the good's price and the money supply. This relationship is explained by the Fisher equation as M×V=P×Y. Here, the total amount of the money or money supply is denoted by M, the velocity of money circulation is denoted by V, the price level is denoted by P, and the real output or real income is denoted by Y.

This theory helps to determine the value of money. This also helps to stop inflation.

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Answer:

A. 25 m/s2

hope it's right

If a  car accelerates from 7.0 m/s to 12.0 m/s in 5 s, then the average acceleration for this time interval would be 1 m/s2.

Therefore the correct answer is option C.

The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².

As given in the problem If a  car accelerates from 7.0 m/s to 12.0 m/s in 5 s, then w have to calculate the average acceleration for this time interval,

By using the first equation of motion,

v = u +at

12 = 7 + 5a

5a = 5

a = 1 m/s²

Thus, the average acceleration of the car comes out to be 1 m/s², therefore the correct answer is option C.

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Answer:

Friction = 2 N

Explanation:

F = ma

  = .4 * 24.5 = 9.8 N   net force      10 N by stick means Ffriction = 2 N

The frictional force acting on the shuffleboard puck is 6.08 N.

Frictional force is defined as the resistive force that prevents the relative motion between two surfaces that are in contact with each other.

Here,

Horizontal force applied on the shuffleboard puck, F = 10 N

Mass of the shuffleboard puck, m = 400 g = 0.4 kg

Acceleration of the shuffleboard puck, a = 24.5 m/s²

According to Newton's third law,

F - f = ma

where f is the frictional force acting on the shuffleboard puck.

So, the frictional force,

f = F - ma

f = 10 - (0.4 x 9.8)

f = 10 - 3.92

f = 6.08 N

Hence,

The frictional force acting on the shuffleboard puck is 6.08 N.

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Answer:

80 J

Explanation:

PE = mgh

PE = (4 kg)(9.8 m/s^2)(2 m)

PE = 78.4 J and with sig figs, it would be 80 J

The equation below is completed by the chromium nucleus.

Chromium is mostly found in chromite. The locations where this ore can be found include South Africa, India, Kazakhstan, and Turkey. In an electric arc furnace, chromite is often reduced with carbon to generate chromium metal, as is chromium(III) oxide when it is reduced with silicon or aluminum.

An important mineral called chromium helps insulin work properly in the body by regulating blood sugar levels. Your body uses the hormone insulin to convert sugar, starchy carbs, and other foods into the energy you require for daily activities.

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A convex spherical mirror has a radius of curvature of magnitude 38.0 cm. We have calculated the position of the virtual image and the magnification for object distances of 33.0 cm and 43.0 cm. The images formed are virtual, and the image formed is erect.

A convex spherical mirror has a radius of curvature of magnitude 38.0 cm. The position of the virtual image and the magnification for object distances of 33.0 cm are:

Image location: 22.5 cm

Magnification: 0.58

The magnification formula is given by:

magnification = -v / u

Where ,-u is the object distance-v is the image distance for a concave mirror (negative for virtual image)-v is the image distance for a convex mirror (positive for virtual image)

Therefore, -u = -33 cm

33 cm (as the object is on the same side as the virtual image and the center of curvature)-v

33 = 1 / f (where f is the focal length of the convex mirror, which is half the radius of curvature)

v / 33 = 1 / (38/2)

v / 33 = 0.0263

v = 0.0263

33 = 0.868 cm (up to three significant figures)-

087 cm

The position of the virtual image is 0.87 cm in front of the mirror. Since the image is virtual, it is formed behind the mirror. Therefore, the sign of the answer is negative. Magnification is given by:

magnification = -v / u= -0.868

33= -0.0263

Magnification is equal to -0.0263.

The position of the virtual image and the magnification for object distances of 43.0 cm are:

Image location: 31.4 cm

Magnification: 0.93The magnification formula is given by:

magnification = -v / u

Where, -u is the object distance-v is the image distance for a concave mirror (negative for virtual image)-v is the image distance for a convex mirror (positive for virtual image)

Therefore, -u = -43 cm (as the object is on the same side as the virtual image and the center of curvature)-v / 43 = 1 / f (where f is the focal length of the convex mirror, which is half the radius of curvature)

v / 43 = 1 / (38/2)-v / 43

0.0263-v

0.0263 × 43 1.13 cm (up to three significant figures)

v ≈ 1.13 cm

The position of the virtual image is 1.13 cm in front of the mirror. Since the image is virtual, it is formed behind the mirror. Therefore, the sign of the answer is negative. Magnification is given by: magnification

v / u= -1.13 / 43

-0.0263

Magnification is equal to -0.93. The images in parts (a) and (b) are upright, as the magnification is less than 1. They are virtual, and the image formed is erect. Hence, the answer is as follows:

Image location: -0.87 cm

Magnification: -0.0263

Image location: -1.13 cm

Magnification: -0.93

A convex spherical mirror has a radius of curvature of magnitude 38.0 cm. We have calculated the position of the virtual image and the magnification for object distances of 33.0 cm and 43.0 cm. The images formed are virtual, and the image formed is erect. The images in parts (a) and (b) are upright, as the magnification is less than 1.

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The circumference of the circle that can be drawn with a string that is 7 cm long is 7π or approximately 21.99 cm.

To find the circumference of the circle that can be drawn with a string that is 7 cm long, we need to use the formula for circumference. The formula for circumference is C = 2πr, where r is the radius of the circle.

Since we have a piece of string that is 7 cm long, this means that the radius of the circle is half of the length of the string, which is 7/2 = 3.5 cm.

Now, we can use the formula for circumference to calculate the value:
C = 2πr
C = 2π(3.5)
C = 7π

Therefore, the circumference of the circle that can be drawn with a string that is 7 cm long is 7π, which is approximately 21.99 cm (since π is approximately 3.14).

In conclusion, the circumference of the circle that can be drawn with a string that is 7 cm long is 7π or approximately 21.99 cm.

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The image where the rod is held near to the left side of the sphere on the stand, making the left side of the sphere become positively charged, best represents the resulting charge distribution on the conducting sphere.

Since the rod is too far away to contact the remaining portion of the sphere, it will remain neutral. The electrons in the sphere's substance will be drawn away from the positive charge on the left side of the sphere, leaving a region of positive charge there. The electrons will stay put on the right side of the sphere, creating a neutral charge there.

The image is provided below

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Answer:

Well, a fresh off the fruit peel, although smooth by touch, has enough friction to prevent a major slip and fall. ... As the banana peel stays on the ground, it begins to rot and get slimy. If someone were to then step on that rotting, slimy banana peel, they would be in for a decent slip.

Explanation:

Nuclear fusion reactions, like those in the Sun, take place only at high temperatures because the high temperatures are needed to ionize the atoms (to strip them of their electrons) so that the bare nuclei can interact. The correct option is B.

Nuclear fusion is a reaction that occurs when two light atomic nuclei combine to form a heavier nucleus. Nuclear fusion reactions require high temperatures and high pressures to occur. On Earth, scientists have yet to perfect a method for controlling nuclear fusion, but they have been successful in recreating the conditions that cause it to occur.

The high temperatures are needed to ionize the atoms (to strip them of their electrons) so that the bare nuclei can interact. All nuclei are positive, and high temperatures and the high velocities that go with them are necessary to force these repulsive nuclei together, as in the Sun and other stars. The Sun's core temperature is 15 million °C, which is sufficient to initiate fusion reactions. When hydrogen is ionized, the nuclei of the atoms are released and may interact with one another to form a heavier nucleus. This process generates a lot of energy that is released in the form of heat and light.

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The gravitational force will decrease when we increase the distance between the objects and decrease the mass of both objects.

The factors affecting gravitational force are the masses of the objects and the distance separating the objects.

The gravitational force increases with increase in mass and decreases with increase in distance of separation and vice versa.

Therefore, the gravitational force will decrease when we increase the distance between the objects and decrease the mass of both objects.

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Explanation:

According to newtons first law of motion " A body is at a state of rest or uniform motion unless acted upon by a force (external)" which will either

1. change the direction

2. change the acceleration

3. change the velocity(moves or stop the body from moving)

4. change the shape or size

Answer:

history

Explanation:

Answer:

20.41 m

Explanation:

Let's list out the relevant variables in this problem. Take the upwards direction to be positive and the downwards to be negative.

We are using the fact that at maximum height, the object's velocity is 0 m/s right before it changes direction to fall vertically back down to Earth.

Find the constant acceleration equation that contains these four variables.

Substitute the known values into the equation and solve for Δy, the maximum height.

The maximum height of the stone is 20.41 m. Notice that its mass was irrelevant when solving for its maximum height when thrown.

Answer:

A chain reaction will be sustained in a sub-critical mass.

Explanation:

Hope this helps!

If not, I am sorry.

Answer:

The answer is A

Explanation:

I got it right duh

The extension of the spring is 4.83 m, if work done is 35 Newton and spring constant is 3 k N/m.

The spring constant, k, is a measure of the stiffness of the spring. it's far one of a kind for unique springs and materials. the larger the spring regular, the stiffer the spring and the greater.

Spring constant of 3 k N/m,

The amount of work done in extending is 35 N

WORK DONE by spring force = 1/2 k X²

                                                 ⇒0.5 * 3 * X²

                                   35 N = 0.5 * 3 * X²

                                 X² = 35/1.5

                                  x = \(\sqrt{23.33}\)

                                     X = 4.83 m

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The extension of the spring is can be found out by using the Work Done due to extension in Spring Constant K. The extension in the spring is 4.83m.

The spring constant, k, is a measure of the stiffness of the spring. It is for springs and materials which measures the ratio of force that affects the spring and the displacement caused by the force action.

Spring constant depends on the stiffness of the spring, wire thickness, number of turns in wound coil, length of spring and diameter of the coil.

Given:

Spring constant = 3000 N/m

Work Done in extension= 35 N

Let the extension in spring by x.

∴ Work Done by spring force = 1/2 kx²

                        Work done   = 0.5 × 3 × x²

    ⇒                                 35 N = 0.5 × 3 × x²

    ⇒                                      x² = 35/1.5

     ⇒                                         x = 4.83m

Hence, the extension of spring is 4.83m.

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Answer:

C. Exothermic Reaction

Explanation:

Let's go through the choices

A. Combustion - Combustion is a highly exothermic / redox reaction which produces light and heat (i.e basically it bursts into flames). In the description, the only reaction is that it feels warm, hence this is not the answer.

B. Endothermic - Recall that endothermic reactions absorbs heat and thus cools the surroundings thereby making test tube feel cooler. this is obviously not the case so this is not the answer.

C. Exothermic - Recall that exothermic reactions releases heat and thus causes the surroundings thereby making the test tube feel warmer (or hotter in some cases). This describes our situation so THIS IS THE ANSWER.

D. Endergonic reactions require an input of energy from an external source that is adsorbed by the reaction (for example if heat was applied by an external source). In this case, there is no mention of additional energy sources. Hence this is probably not the answer.

The atoms in a solid sample typically have the least kinetic energy compared to those in a liquid or gas sample.

In a solid, the atoms are tightly packed and have limited freedom of movement. They primarily vibrate in fixed positions around their equilibrium points. The intermolecular forces in solids are stronger, holding the atoms in a relatively fixed arrangement.

As a result, the atoms in a solid have lower kinetic energy compared to those in a liquid or gas. In a liquid, the atoms have slightly more kinetic energy as they are able to move more freely and take on various positions and orientations. In a gas, the atoms have the highest kinetic energy as they move rapidly and randomly in all directions.

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