A ________ refers to a way of standing.
stance
strength
upright
posture

These two forces are called action and reaction forces and are the subject of Newton's third law of motion.

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The only vehicle that is accelerating is: C: a race car that is rounding a sharp turn at a constant speed.

Acceleration refers to a change in velocity, which can mean a change in speed or direction. In the case of option C, the race car is constantly changing its direction, so it is experiencing acceleration even though its speed remains constant.

Option A is cruising at a steady speed, so it is not accelerating.

Option B is parked and not moving, so it is not accelerating.

What is velocity?

Velocity is a physical quantity that describes the rate and direction of the motion of an object. It is a vector quantity, which means it has both magnitude and direction.

The magnitude of velocity is the speed of an object in a given direction. For example, if a car is traveling at a speed of 50 miles per hour (mph) in the north direction, its velocity is 50 mph north.

The direction of velocity is the direction in which the object is moving. It is usually specified as an angle relative to a reference axis or direction. In the example above, the direction of the car's velocity is north.

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Explanation:

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When comparing the motions of a baseball thrown from a height of 10 ft and a ball that is simply dropped from the same height, there are distinct differences.

The thrown baseball exhibits a combination of vertical and horizontal motion. It follows a curved path due to the initial throwing velocity and the force of gravity, resulting in a parabolic trajectory. In contrast, the dropped ball experiences only vertical motion, falling straight down toward the ground in a vertical line. While both objects are affected by gravity, the thrown baseball's additional horizontal velocity allows it to cover a longer distance and follow a more complex path compared to the vertically descending dropped the ball.

Therefore, the thrown baseball exhibits both vertical and horizontal motion, following a curved trajectory due to the combination of the initial throwing velocity and the force of gravity. The dropped ball, on the other hand, experiences only vertical motion, falling straight down toward the ground along a vertical line.

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Water vapor typically occupies about 1-4% of the air's volume near the earth's surface.

The exact percentage varies depending on factors such as temperature, humidity, and altitude. Warmer air can hold more water vapor than cooler air, so the percentage of water vapor in the air tends to be higher in hot and humid conditions. Conversely, cold air can hold less water vapor, so the percentage of water vapor in the air tends to be lower in cold and dry conditions.

Altitude can also affect the percentage of water vapor in the air, with lower altitudes typically having higher percentages due to the greater amount of moisture available near the surface. Overall, water vapor plays an important role in regulating the earth's climate and weather patterns.

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Answer:

The first person to "measure gravity" is sir Issac newton

Option A and F are correct. If the angle of the slope is increased, the change of gravitational potential energy between the two heights: (A) increases, and (F) depends only on the difference between the two heights.

Gravitational potential energy is determined by the height and mass of an object. When an object moves up or down a slope, the angle of the slope affects the height change between two points. Increasing the angle of the slope means that the object moves to a higher height in a shorter distance. As a result, the change in height increases, leading to an increase in gravitational potential energy. Therefore, option A is correct.

The change in gravitational potential energy between two heights depends on the difference in height and not on the path followed. It is independent of factors such as the length or shape of the slope. Hence, option F is also correct.

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The relative density of the substance is equal to the density of the substance concerning the density of the reference substance.

The relative density of the substance is known as the specific gravity.

Hence, option B is the correct answer.

False. A carbon-detonation supernova occurs in a single carbon-oxygen white dwarf star, not in a close binary system. The white dwarf undergoes a thermonuclear explosion due to the ignition of carbon fusion, leading to a supernova.

A carbon-detonation supernova does not start out as a white dwarf in a close binary system. Instead, it originates from a single carbon-oxygen white dwarf star. In a close binary system, where two stars orbit each other closely, a different type of supernova known as a Type Ia supernova occurs. In this case, the white dwarf accretes matter from its companion star until it reaches a critical mass, triggering a runaway nuclear fusion reaction and resulting in a supernova explosion. On the other hand, a carbon-detonation supernova is caused by the ignition of carbon fusion within a single white dwarf, without the involvement of a companion star.

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The KE of a 6 kg mass at 4 m/s will be 48 J. The kinetic energy is obtained, found as the product of mass and the square of the velocity.

The energy possessed by the body by the virtue of motion is known as the Kinetic energy. It is found as the product of mass and the square of the velocity.

The given data in the problem is;

The mass is, m=6 kg

The velocity is,v= 4 m/s

The kinetic energy is found as;

\(\rm KE = \frac{1}{2}mv^2 \\\\\ \rm KE = \frac{1}{2}6 (4) ^2\\\\\ KE= 48 \ J\)

Hence, the KE of a 6 kg mass at 4 m/s will be 48 J.

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Answer:

D. Forces opposing the motion of surfaces in contact with each other

Explanation:

Friction moves in the opposite direction of the object.

Answer:

0.39 km west

Explanation:

The position of Runner A is:

x = -5.7 + 8.8 t

The position of Runner B is:

x = 4.2 − 7.6 t

When the positions are equal:

-5.7 + 8.8 t = 4.2 − 7.6 t

16.4 t = 9.9

t = 0.604

Plug into either equation to find the position at this time:

x = -5.7 + 8.8 (0.604)

x = -0.39

The runners are 0.39 km west of the flagpole when they meet.

Option A and B are correct.

We have a spinning satellite which begins to unfold two solar panels as shown in the figure.

We have to investigate which of the given statements are true.

The relation the linear velocity (v) and angular velocity (ω) of a body undergoing circular motion in the circle of radius r is -

v = rω

According to the question - two solar panels unfolded themselves. The key point to understand here is that initially when the panels were folded, each and every individual particle inside the panel were closer to the rotational axis. However, when they unfolded, each and every particle inside the panels went away from the rotational axis. In a general sense, for a individual particle inside the panel, assume that initially the its distance from center was 'r' and after unfolding it became 'R' such that R > r. Therefore, using the formula -

v = rω

ω = \(\frac{v}{r}\)

Now, ω \(\alpha\) \(\frac{1}{r}\) ,

As r increased to R, the angular velocity decreases.

Now, we know that the angular momentum (L) is given by -

L = mvr

As r increases, L increases.

Therefore, the angular momentum increases.

Hence, Option A and B are correct.

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Answer: B

Explanation:

Due to the rubbing of the balloons on their hair, the balloons have gained negative charges which lie on the balloons surfaces. Like charges will repel each other according to the Coulomb force

Answer: The volume and shape of a solid could be changed by force.

Explanation: Solids can only change their shape by force, as when broken or cut.

Answer:

force

Explanation:

Answer:

ii) Insulating materials that gain electrons when rubbed become negatively charged. c) An electric current is a flow of charge. d) An isolated metal object that is initially uncharged will gain charge if it is brought into contact with a charged object. e) A metal object is earthed by connecting it to the ground.

Explanation:

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With angular momentum quantum number l = 2. in units of ħ, the value of l will be 2.4494 h.

The total angular momentum quantum number in quantum mechanics parametrizes the total angular momentum of a particular particle by combining its orbital angular momentum and intrinsic angular momentum.

Given the angular momentum quantum number l = 2. in units of ħ. Therefore, the value of L can be written as,

L = √[l (l + 1)]

L = √[2 (2 + 1)]

L = √[2 (3)]

L = √6

L = 2.4494 h

Hence, With angular momentum quantum number l = 2. in units of ħ, the value of l will be 2.4494 h.

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Answer:

C, B, D, A

Explanation:

Stress is F/A, where F = 9.8*mass and A = pi(d/2)^2

Do the math for each and the stress from least to greatest is C, B, D, A.

The height column is unnecessary information.

When four different cylinders(A,B,C,D) were each subjected to a force by placing four different masses on top of them. the Rank of stress on these cylinders from least to greatest is D, C, B, A.

Stress is defined as applied force(F) per unit cross sectional area(A) on which force is applied. it I.e. Stress = F/A. its SI unit is N/m². More force on small area leads to higher stress.

Given,

For A

Mass m = 5.2 kg

Diameter = 2.6 cm

Radius r = 1.3 cm = 0.013 m

Height =  32.5

Stress on A = Force ÷ A = mg ÷ πr²

Stress = (5.2×9.8) ÷ (3.14×0.013²)

Stress = 96031 N/m²

For B

Mass m = 3.6 kg

Diameter = 2.3 cm

Radius r = 1.15 cm = 0.011 m

Height = 27.3

Stress on B = Force ÷ A = mg ÷ πr²

Stress = (3.6 ×9.8) ÷ (3.14×0.011 ²)

Stress = 92856 N/m²

C

Mass m = 4.7 kg

Diameter = 2.7 cm

Radius r = 1.35 cm = 0.0135 m

Height = 16.9

Stress on C= Force ÷ A = mg ÷ πr²

Stress = (4.7 ×9.8) ÷ (3.14×0.0135²)

Stress = 80487 N/m²

D

Mass m = 2.9 kg

Diameter = 32.2 cm

Radius r = 16.1 cm = 0.16 m

Stress on D = Force ÷ A = mg ÷ πr²

Stress = (2.9×9.8) ÷ (3.14×0.16²)

Stress = 353 N/m²

Hence Rank of stresses on the 4 cylinders are D, C, B, A

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Answer:Answer is A:The energy from the waves of light coming from bright lights would add up and free an electron.

Explanation:

1. They collect evidence and make sure that the model can be used with reasoning to explain the evidence.

2. The energy from the waves of light coming from bright lights would add up and free an electron.

3. The spots are the result of interference, which happens with waves but not particles.

4. This is not something that waves do because they need a medium to travel through, while particles do not.

5. When the electromagnetic wave peaks overlap, a bright fringe forms.

I promise this is correct because i failed and this is what it said if this is ever wrong they must have changed the quick check

Answer:

Explanation:

A is not correct. That means that D is since they offer exactly the opposite meanings.  

C is rubbish. One pole could not be stronger than the other. Heaven help us if touched the stronger pole.

B the very point of a magnet is that it does matter how the atoms are orientated.

The formula L = Ft0R states that the change in angular momentum of the cylinder from time t=0 to time t=t0 is directly proportional to the force exerted on the string and the length of time over which it is applied.

The pace at which an angle changes in a situation where a rotation occurs in time t is known as the angular velocity. Radians per second (rad/s) are the units used to measure angular velocity.

The student can use the following equation to calculate the cylinder's change in angular momentum from t=0 to t=t0:

ΔL = Lf - Li

The equation: can be used to determine the cylinder's ultimate angular momentum, Lf.

Lf = Iωf

A uniform cylinder's rotational inertia about an axis that passes through its centre of mass and is parallel to its axis of symmetry is given by:

I = 1/2 MR²

Substituting this expression for I and ωf into the equation for Lf, we get:

Lf = (1/2)MR²ωf

Therefore, the change in angular momentum ΔL of the cylinder from t=0 to t=t0 is:

ΔL = (1/2)MR²ωf - 0

ΔL = (1/2)MR²ωf

The student can use the rotational motion equation to calculate the cylinder's ultimate angular velocity, f:

τ = Iα

The angular acceleration α is related to the angular velocity ω by the equation:

α = (ωf - ωi)/t0

where t0 is the period of time during which the force is applied, and i is the starting angular velocity, which is zero.

When we enter these expressions into the torque equation, we obtain:

Fr = (1/2)MR²(ωf - ωi)/t0

Solving for ωf, we get:

ωf = (2Ft0)/(MR)

When we add this expression for f to the equation for L, we obtain:

ΔL = (1/2)MR²(2Ft0)/(MR)

ΔL = Ft0R

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The speed of the skier at the bottom of the slope is 15.1 m/s.

The speed of the skier at the bottom of the slope is calculated by applying the principle of conservation of energy.

Kinetic energy at bottom = percentage of potential energy converted into kinetic energy.

K.E = 20%P.E

K.E = 0.2P.E

¹/₂mv² = 0.2 mgh

¹/₂v² = 0.2gh

v² = 2 (0.2gh)

v = √2(0.2gh)

where;

sin (6.4) = h /L

h = L x sin(6.4)

h = 500m x sin (6.4)

h = 58.28 m

v =  √2(0.2 x 9.8 x 58.28 )

v = 15.1 m/s

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Answer:

Assuming that the sound wave reflected only once off the surface of the water and traveled straight back up to the person, we can calculate the distance between the person and the surface of the water in the well as follows:

Distance = (Speed of sound in air x Time)/2

Where the speed of sound in air is approximately 343 meters per second at standard temperature and pressure, and the time is 0.3 seconds.

Distance = (343 m/s x 0.3 s)/2

Where the speed of sound in air is approximately 343 meters per second at standard temperature and pressure, and the time is 0.3 seconds.

Distance = (343 m/s x 0.3 s)/2

Distance = 51.45 meters

Therefore, the distance between the person and the surface of the water in the well is approximately 51.45 meters.

Answer:

I think the answer is 1 m per second.

The prove of  Angle XYZ- Angle NYM is given below:

Note that from the image given;

Since ∠XYZ is said to be congruent to ∠NYM it can be proven by the use of the reflexive property.

The reflexive property is one that informs that any shape is regarded congruent to itself.

Since ∠NYM has a different way to call ∠XYZ that uses a different vertexes, but the sides are made up of the two angles which are said to be the same.

Therefore , ∠XYZ ≡ ∠NYM are proved by the reflexive property.

Since ΔXYZ is the same with Δ NYM, it can be proven by the AA (angle-angle) similarity theorem.

We have 2 angles Δ XYZ and Δ NYM:

Note that ∠YXZ ≡ ∠YNM

              ∠XYZ ≡ ∠NYM

So,  ΔXYZ is said to be the same to ΔNYM and it is proven by the AA similarity theorem.

Therefore, The prove of  Angle XYZ- Angle NYM is given below:

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Answer:

1. parrael

2. corresponding angles theorem

3. NYM

4. AA

Explanation:

just took it

In such a motion, the rigid body rotates along a fixed axis that is parallel to a fixed plane.

In other words, with respect to an inertial frame of reference, the axis is stationary and does not move or change direction. I=jmjr2j, where mj is the mass of the point particle and rj is its distance from the rotation axis, is the moment of inertia for a system of point particles revolving about a fixed axis. The angle of rotation is the angle at which an object revolves (turns) around a given point. Constant angular speed rotation is the most basic type of rotation around a fixed axis. The total torque then becomes zero.

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Answer:

The ball hit with 12N

Explanation:

Just took the quiz and got it right

Explanation:

A vertical column of elements in the periodic table is called a group

A horizontal row of elements in the periodic table is called a period

Atoms of elements in the same group have the same number of valence electrons

As you move from left to right on the periodic table, the atomic number increases

Answer: the first one is group

2. Period

3. Number of valence elections

4. increases