Why does an object in motion stay in motion unless acted on by an unbalanced force? A) because forces are what stop and start motion B) because balanced forces can not exist in nature C) because motion is the inherent state of all matter Eliminate D) because motion, once begun, continues to accelerate

he speed up the incline is 300m/5s = 60m/s

the horizontal component of that is 60 cos 15 = 57.95m/s

The instant it was dropped, the ball had zero speed.

After falling for 1 second, its speed was 9.8 m/s straight down (gravity).

Its AVERAGE speed for that 1 second was (1/2) (0 + 9.8) = 4.9 m/s.

Falling for 1 second at an average speed of 4.9 m/s, is covered 4.9 meters.

ANYTHING you drop does that, if air resistance doesn't hold it back.

The Answer is A)

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Answer: Option D. The total amount of both matter and energy does not change.

Explanation:

From Law of conservation of energy and Einstein's mass-energy relation, we know that, energy neither is formed not is destroyed. It converts from one form to another. Einstein's mass-energy relation: E = mc². It means, Matter is a form of energy i.e. matter holds energy equivalent to product of its mass and square of speed of light. Matter and energy can change forms but the total amount does not change in a closed system. Thus, correct option is D.

Answer: the total amount of both matter and energy does not change (d)

Explanation:

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B. a 400Hz tuning fork

Answer:  The correct answer is 400 Hz tuning fork.

Explanation:

Resonance occurs when the natural frequency of the object matches with frequency of the others.

In the given problem, there are multiple tuning forks present in the room, and Annie strikes one with a natural frequency of 400 Hz.  

Therefore, the tuning fork having frequency of 400 Hz will begin to vibrate through resonance and the sound louder.  

The metal that is the most abundant in the earths crust is Aluminum

I believe it is iron (Fe).

Iron + oxygen are usually found together.

the right answer is C

Sir Isaac Newton discovered and described the laws of motion in his book Principia Mathematica published on July 5th, 1687.

D. Isaac Newton

Answer:

D, Isaac Newton.

Explanation:

Newton's laws of motion, relations between the forces acting on a body and the motion of the body, first formulated by English physicist and mathematician Sir Isaac Newton.

Answer: Electronic geometry is tetrahedral, molecular geometry is trigonal pyramidal and hybridization is [tex]sp_3[/tex]

Explanation: Formula used for calculating the no of electrons:

[tex]:{\text{Number of electrons}} =\frac{1}{2}[V+N-C+A][/tex]

where, V = number of valence electrons present in central atom i.e. carbon = 4

N = number of monovalent atoms bonded to central atom=3

C = charge of cation = 0

A = charge of anion = -1

[tex]CBr_3^{-}:[/tex]

[tex]{\text{Number of electrons}} =\frac{1}{2}[4+3-0+1]=4[/tex]

The number of electrons is 4 that means the hybridization will be [tex]sp^3[/tex] and the electronic geometry of the molecule will be tetrahedral.

But as there are three atoms around the central carbon, the fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be trigonal pyramidal.

The CBr₃ compound has a tetrahedral electron geometry and molecular geometry because it has four regions of electron density. As a result, the carbon atom undergoes sp3 hybridization. The structure and chemical bonding of a molecule, which are indicated by its electron pair geometry, molecular geometry, and hybridization, are key in predicting its properties and reactivity.

The compound CBr₃ has an electron geometry and molecular geometry that are both tetrahedral due to the presence of four regions of electron density (three for the bonded Bromine atoms and one for the lone pair). This also results in the carbon atom undergoing sp3 hybridization. As a result, the electron pair geometries and molecular structures for CBr₃ are tetrahedral.

An easy way to figure this out is by using the valence shell electron pair repulsion (VSEPR) theory, where the molecular structure is largely determined by the repulsion between the electron pairs in the valence shell of the atoms in the molecule. Overall, the electron pair geometry, molecular geometry, and hybridization of a molecule provide key information about its structure and chemical bonding which are crucial to predicting its properties and reactivity.

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Answer:

8.6 m

Explanation:

The motion of a soccer ball is a motion of a projectile, with a uniform motion along the horizontal (x-) direction and an accelerated motion along the vertical (y-) direction, with constant acceleration [tex]a=g=-9.8 m/s^2[/tex] towards the ground (we take upward as positive direction, so acceleration is negative).

The initial velocity along the vertical direction is

[tex]v_{y0} = v_0 sin \theta = (26 m/s)(sin 30^{\circ})=13 m/s[/tex]

Now we can consider the motion along the vertical direction only. the vertical velocity at time t is given by:

[tex]v_y(t)=v_{y0} +at[/tex]

At the point of maximum height, [tex]v_y(t)=0[/tex], so we can find the time t at which the ball reaches the maximum height:

[tex]0=v_{y0}+at\\t=-\frac{v_{y0}}{a}=-\frac{13 m/s}{-9.8 m/s^2}=1.33 s[/tex]

And now we can use the equation of motion along the y-axis to find the vertical position of the ball at t=1.33 s, which corresponds to the maximum height of the ball:

[tex]y(t)=v_{y0}t + \frac{1}{2}at^2=(13 m/s)(1.33 s)+\frac{1}{2}(-9.8 m/s^2)(1.33 s)^2=8.6 m[/tex]

it is colliding with a proton or neutron, it is deflecting toward point X. is the best explanation for why a particle is striking point X.

Alpha particles, also known as alpha rays or alpha radiation, are made up of two protons and two neutrons bonded together to form a helium-4 nucleus-like particle.

The experiment demonstrates Rutherford's atomic model, and he reasoned that every atom has a nucleus that holds all of its positive charge and the majority of its mass.

it means that most of the space inside it is vacant, but when it strikes the nucleus directly, it returns at 180°, and when it passes through the nucleus, it bends away at a 90°.

Hence it is colliding with a proton or neutron, it is deflecting toward point X. is the best explanation for why a particle is striking point X.

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Answer: The magnitude of impulse imparted to the ball by the golf club is 2.2 N seconds

Explanation:

Force applied on the golf ball = [tex]5.0\times 10^3 N[/tex]

Mass of the ball = 0.05 kg

Velocity with which ball is accelerating = 44 m/s

Time period over which forece applied = t

[tex]f=ma=\frac{m\times v}{t}[/tex]

[tex]t=\frac{0.05 kg\times 44m/s}{5.0\times 10^3 N}=4.4\times 10^{-4} seconds[/tex]

[tex]Impulse=(force)\times (time)=f\times t = 5.0\times 10^3\times 4.4\times 10^{-4} seconds=2.2[/tex] Newton seconds

The magnitude of impulse imparted to the ball by the golf club is 2.2 N seconds

The magnitude of impulse imparted to the ball by the golf club is 2.2 N-s.

Given data:

The mass of golf is, m = 0.05 kg.

The magnitude of average force on ball is, [tex]F = 5.0 \times 10^{-3} \;\rm N[/tex].

The velocity of the ball is, v = 44 m/s.

Apply the impulse-momentum theorem, which says that the average force acting on the body is equal to the change in momentum with respect to time. therefore,

[tex]F = \dfrac{dp}{dt} \\\\F = \dfrac{m \times v}{t} \\F \times t = m \times v[/tex]

Here, t is the impact time and the expression [tex](F \times t)[/tex]  is known as impulse (I).

Solving as,

[tex]F \times t = m \times v\\I = 0.05 \times 44\\I = 2.2 \;\rm N-s[/tex]

Thus, the magnitude of impulse imparted to the ball by the golf club is 2.2 N-s.

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Answer:

False

Explanation:

When 3 (non zero) forces are in equilibrium, the resultant (net) force is 0. The sum of any two components will therefore be non-zero and consequently not equal to the original resultant.

Equation

d = m/v

Givens

Solution

Answer C

Answer:

Newtons II law:

    It  is defined as "the net force acting on the object is a product of mass and acceleration of the body" . Also it defines that the "acceleration of an object is dependent on net force and mass of the body".

Let us assume that,a string is attached to the cart, which passes over a pulley along the track. At another end of the string a weight is attached which hangs over the pulley. The hanging weight provides tension in the spring, and it helps in accelerating the cart. We assume that the string is massless and no friction between pulley and the string.

Whenever the hanging weight moves downwards, the cart will accelerate to right side.

For the hanging weight/mass

When hanging weight of mass is m₁ and accelerate due to gravitational force g.

           Therefore we can write F = m₁ .g

and the tension acts in upward direction T (negetive)

        Now, Fnet = m₁ .g - T

                          = m₁.a

So From Newtons II law F =  m.a

Answer:

Sample Response: How do force and mass affect the acceleration of an object?

Explanation:

Correct answer is B. Designing a space with sound-absorbing tiles.

In order to limit the destructive interference of reflected sound waves in an auditorium, the acoustic engineers needs to provide sound-absorbing tiles in that area. Due to reflection of sound waves, destructive interference is created in the hall of auditorium. Sound-absorbing tiles have ability to absorb those waves and provide good sound ecosystem to the auditorium room.  

Answer:

A. When the force of the water increases, the reaction force pushing the hose back also increases.

When the force of the water increases, so does the reaction force pulling the hose back. The law of action reaction is the concept used to explain.

According to Newton's third law of motion, every action has an equal and opposite reaction. As well as, the action and reaction are always acted in pairs.

The water flow in pipe increases the force of the water because of the law of action-reaction.

When the force of the water increases, so does the reaction force pulling the hose back. The law of action reaction is the concept used to explain.

Hence, due to the more reaction force or firefighters needed to help hold the fire hose when the increase of water flow increases the force of the water.

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32 meters per second

Answer:

32 m/sec

Explanation:

Given,

⇒ Distance that is covered= 960 meters

⇒ Time taken= 30 seconds

We know that,

⇒ [tex]Speed=\frac{distance}{time taken}[/tex]

⇒ [tex]Speed =\frac{960}{30}[/tex]

Therefore, speed = 32 m/sec.

Answer:

A.137.2N

B 137.2N

C.41.16 N

D.Yes

E. 34.3N

Explanation:

THe weight of any object is calculated by multiplying the mass of the object by the gravity of where they are in, in this case is the earth, the gravity of earth is [tex]9.8\frac{m}{s^{2} }[/tex], so the weight of the dog would be:

[tex]w=(14kg)(9.8\frac{m}{s^{2}})[/tex]

[tex]m=137.2 N[/tex]

Now the normal force is the same as the weight.

[tex]Nf=w= 137.2N[/tex]

The maximum force of static friction is calculated by multiplying the weight by the coefficient of static friction:

[tex]Sf=(w)(coefficient)[/tex]

[tex]Sf=(137.2N)(0.3)[/tex]

[tex]Sf=41.16[/tex]

To know this you just have to know the total static force to know if the dog moves, since the force pulling the dog towards the floor is on the Y axis and you are pushing on the x axis, that force is nulified, but you have the friction froce, which is 41.16N, since the force you are pushing with is 50N the dog moves.

When you are sliding somthing over any surface you just have to multiply the weight of the object by the coefficient kinetic friction.

[tex]Kf=(w)(coefficient)[/tex]

[tex]Kf=(137.2N)(.25)[/tex]

[tex]Kf=34.3N[/tex]

About 90 percent of the stars in space are Main Sequence stars. (c)

Answer:

c. Main Sequence

Explanation:

90% of the stars in space are in the main sequence stage.

Nebula is a cloud of dust and hot gases where stars are born. Giant and white dwarf are types of stars.

A plot of star temperature vs luminosity is used to classify all the stars. This plot is known as HR diagram. When plotted on the HR diagram, 90% of the known stars lie on the main sequence stage of the HR Diagram.

Kinetic energy of an object is the energy it contains due to movement. If an object is at rest, it doesn't have kinetic energy. If it's moving, then it has kinetic energy. It's pretty simple! The amount of kinetic energy of an object is dependent upon two variables, one being the mass of the object

In a gravitational field, an object gains potential energy as it moves to a higher position, and loses this energy, transforming it into kinetic energy, as it descends. This is a manifestation of energy conservation where total energy remains constant while energy types (potential and kinetic) transform into each other.

The relationship between potential energy and kinetic energy involves the concept of energy conservation and transfer. In a gravitational field, an object gains potential energy as it moves to a higher position. This potential energy is stored energy due to its position in the gravitational field.

As the object descends, its gravitational potential energy decreases, and this energy gets transferred to kinetic energy. Hence, the kinetic energy of the object increases as it falls downwards. The kinetic energy of the object is related to its speed. The faster the object moves, the larger its kinetic energy. This energy transformation from potential to kinetic energy may continue until all potential energy is converted into kinetic energy, assuming there's no other form of energy loss like air resistance.

This interchange between potential and kinetic energy is a key aspect of energy conservation, which states that the total energy of an isolated system remains constant. In the case of this gravitational field scenario, the conversion from potential to kinetic energy illustrates the principle of energy being neither created nor destroyed, but simply transformed from one type to another.

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The period of a wave with a speed of 34 cm/s and a wavelength of 18 cm is 0.53 seconds. Regions of compression and rarefaction define longitudinal waves, not transverse waves.

Calculate the period of a wave, we can use the relationship between speed (v), wavelength (λ) , and period (T). This relationship is expressed as

v = λ / T

which can be rearranged to find T

Given that the speed of the wave is 34 cm/s and its wavelength is 18 cm, we substitute these values into the equation to find the period:

T = 18 cm / 34 cm/s.

Calculating this gives us T = 0.5294117647 seconds, which rounds to 0.53 seconds.

As for the second part of your question, the regions of compression and rarefaction help define longitudinal waves, but not transverse waves. Transverse waves have crests and troughs, while longitudinal waves consist of compressions and rarefactions.

Answer:

D) Jumping with greater initial velocity would increase the height of his jump.

Explanation:

As the center of the team jumps, his motion is an accelerated motion with initial velocity [tex]v_0[/tex] upward and constant acceleration [tex]g=9.8 m/s^2[/tex] (acceleration due to gravity) towards the ground.

According to the law of conservation of energy, the gravitational potential energy of the center as it reaches its maximum height (h) is equal to the initial kinetic energy just after he starts the jump:

[tex]U=K\\mgh=\frac{1}{2}mv_0^2[/tex]

where

m is the mass of the center

g is the acceleration due to gravity

h is the maximum height

v0 is the initial velocity

Re-arranging the formula, we find:

[tex]h=\frac{v_0^2}{2g}[/tex]

Therefore, we see that the greater the initial velocity v0, the higher the center will jump.

Yes. Partly.  Also on the size and shape of the object, and also on what material it's IN at the time ... like air, water, Helium, Jello, etc.

An object's natural frequency depends partially on the material from which it is made.

true - material determines its strength, hardness, elasticity n other physical properties dat affect its natural frequency. other factors include the shape n size of the object.

Number c is right answer because it doesn't talk about forces rather it talks about planetary motions and orbits

The net external force on the falling ball is 62.87 N.

To find the net external force on the falling ball, we can use Newton's second law, which states that force is equal to mass multiplied by acceleration. In this case, the mass of the ball is 5.5 kg and the acceleration can be found using the equation of motion: d = (1/2)at^2, where d is the distance and t is the time. Plugging in the given values, we can calculate the acceleration to be approximately 11.43 m/s^2. Now, we can use Newton's second law: force = mass x acceleration = 5.5 kg x 11.43 m/s^2 = 62.87 N.

Answer:

All matter on Earth is made up of atoms.

The electron is negatively charged and is located in a cloud surrounding the nucleus.

The proton is positively charged and is found in the nucleus.

Explanation:

As we know that the atom is made up of three sub atomic particles give as

1). Electrons

2). Protons

3). Neutrons

Now we know that neutrons do not have any charge but it stays inside the nucleus and more than 50% of mass of the nucleus is due to neutrons.

Protons are of positive charge and it also stays inside the nucleus and number of protons inside the nucleus is same as atomic number.

Electrons are always of negative charge and it stays outside the nucleus in form of electron cloud and total negative charge of electron must be equal to total positive charge of proton in neutral atom.

Atoms are the basic building blocks of all matter on Earth. The subatomic particles retain the properties of the element, and the electron is negatively charged and located in a cloud surrounding the nucleus.

The statements that correctly describe the atom are:

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1. HP is the output horsepower rating of an engine, while Brake horse power is the input brake horsepower of an engine. ...  Brake horse power is the measurement of an engine's power without any power losses, while HP is  less the power losses Brake horse power

Final answer:

Brake horsepower (BHP) and thrust horsepower (THP) are two different measurements of power in engines. BHP refers to the power output of an engine, while THP is the power generated by a jet engine or propeller to produce thrust.

Explanation:

In physics, brake horsepower (BHP) and thrust horsepower (THP) are two different measurements of power, particularly in the context of engines.

Brake horsepower refers to the power output of an engine measured at the engine's crankshaft, before any losses due to friction or other factors. It is commonly used to describe the power of internal combustion engines in vehicles.

On the other hand, thrust horsepower is a measurement of power specifically for jet engines or propellers. It is the power that the engine or propeller generates in order to produce thrust and propel the aircraft forward.

v=d/t=110/72=1.5277 m/s