A ball rolls down a hill. it starts with velocity of 2 ms. after 2 seconds, the ball has a velocity of 12 ms. what is the acceleration of the ball? responses 2 ms2 2 m per s squared, 4 ms2 4 m per s squared, 5 ms2 5 m per s squared, 7 ms2

The bicycle's average speed was 54.43 kilometers per hour. the bicycle's average speed in kilometers per hour.

what is speed ?

Speed is a measure of how quickly an object moves or changes its position over time. It is a scalar quantity, which means it is described by a magnitude only and does not have a direction. Speed is measured in units such as meters per second (m/s), kilometers per hour (km/h), and miles per hour (mph). The faster an object moves, the greater its speed.

Speed is often confused with velocity, which is a vector quantity that includes both magnitude and direction. Acceleration is the rate at which an object's speed changes over time. An object with a constant speed will have an acceleration of zero, while an object increasing its speed will have a positive acceleration and an object decreasing its speed will have a negative acceleration.

To learn about more speed.

https://brainly.com/question/4931057

#SPJ4

The 18 kg child must sit 3.3 meters from the fulcrum to balance the system.

To determine the distance from the fulcrum at which an 18 kg child must sit on a seesaw to balance a 30 kg child sitting 2.0 m away from the fulcrum, you can use the principle of moments.

The principle of moments states that for a system to be in equilibrium (i.e., balanced), the clockwise moments (force x distance) must be equal to the counterclockwise moments.

We know the weight of the 30 kg child is 30 x 9.8 = 294 N (Newtons), and it is 2.0 m away from the fulcrum. Therefore, the clockwise moment is 294 x 2 = 588 Nm.

The weight of the 18 kg child is 18 x 9.8 = 176.4 N.

To balance the system, the counterclockwise moment must also be 588 Nm. Therefore, the distance from the fulcrum at which the 18 kg child must sit is:

588 Nm = 176.4 N x d

d = 588/176.4 = 3.3 meters

So, the 18 kg child must sit 3.3 meters from the fulcrum to balance the system.

Learn more about balancing a seesaw here: https://brainly.com/question/13939005

#SPJ4

The impulse experienced by an object is the force applied to it multiplied by the time during which the force is applied. In this case, the impulse experienced by the ball is equal to the force exerted by the spring on the ball multiplied by the time over which the force is applied. Since the force is equal to the mass of the ball multiplied by the acceleration of the ball, we can use the following equation to calculate the impulse:

Impulse = Force x time = (mass x acceleration) x time

We know that the mass of the ball is 1 kg, and the final velocity of the ball is 200 m/s, but we don't know the time of the acceleration, so we need more information to calculate the impulse.

Another way to calculate the impulse is using the change of momentum principle. The impulse is equal to the change in momentum. The change in momentum = final momentum - initial momentum = m * vf - m * vi = m * (vf - vi)

Since the initial velocity was 0 and the final velocity is 200 m/s, the impulse is equal to m * vf = 1 kg * 200 m/s = 200 Ns

So, the impulse experienced by the ball is 200 Ns

I hope this helps :)

A bullet with mass is fired with an initial velocity from a gun with a mass of 4.50 kg the speed of the recoil of the gun is -7.67 m/s.

Given information:

Mass, (m) = 60.0 g,

velocity, (v) = 575 m/s,

Mass, (M) = 4.50 kg,

The speed of the recoil of gun V is calculated by the conservation of momentum:

momentum conservation:

0 = mv + MV

Rearrange:

V = (-mv) ÷ M

V = (-60 × 575) ÷ (4500)

V = -7.67 m/s

Here negative means the direction is opposite to v.

Therefore, The speed of the recoil of the gun is -7.67 m/s.

To know more about momentum conservation:

https://brainly.com/question/33316833

#SPJ12

If you walked at an average speed of 1.2 m/s, 13.3 s  long would it take to cross a road that is 16-m wide.

What is speed ?

The rate of a directionally changing object's location. The distance travelled divided by the time required to travel that distance is the definition of speed. Speed is a scalar quantity because it only has an angular component and no magnitude.

What is velocity ?

An object's velocity is a key factor in determining its position and rate of motion. It is comprehensible as the distance an object moves in a single interval of time. The term "velocity" describes how far an object travels in a predetermined length of time.

T = D/S = 16m/1.2m/s = 13.3 s

Therefore, If you walked at an average speed of 1.2 m/s, 13.3 s  long would it take to cross a road that is 16-m wide.

Learn more about speed from the given link.

https://brainly.com/question/13262646

#SPJ4

The distance from home plate to second base on a softball diamond is 84.85 m and on a  baseball diamond is 127.28 m.

The illustration is a stylized drawing of a group of people gathered together in a circle, their arms linked together in a gesture of solidarity. The figures are all various shades of blue, and their faces are uplifted and smiling. The image conveys the idea of collective strength and unity. It is a powerful visual representation of coming together to support each other, and of the strength that can be found in community.

Using the Pythagorean Theorem

c = [tex]\sqrt{a^2 + b^2}[/tex]

Diagonal = c =  d(s) = √2s2

d(s) = [tex]\sqrt{2s^2}[/tex]

d(s) = [tex]\sqrt{s^2 + s^2}[/tex]

The function represents Pythagorean theorem

Given s is 90m

d(90) = [tex]\sqrt{90^2 + 90^2}[/tex]

d(90) = 127.28 m

In the same way

d(60) = [tex]\sqrt{60^2 + 60^2}[/tex]

d(60) = 84.85 m

Thus, The distance from home plate to second base on a softball diamond is 84.85 m and on a  baseball diamond is 127.28 m.

To learn more about illustration

https://brainly.com/question/28513747

#SPJ4

The resultant couple moment acting on the beam is found to be 740Nm.

When a force is applied perpendicular to a point at a specific distance from that point, a moment is a rotational force that results. It is computed by multiplying the perpendicular force by the separation from the point. A bending moment is just the bend brought on by a moment in a beam.

M resultant couple moment = F x d

                         = (300 x 5 + 200 x 0.2 - 400 x 2)

                                 => 740Nm.

A building experiences a reaction force when it rests against another object. Calculating the reaction forces at the supports as a result of the forces operating on the beam is a necessary step in the analysis of a beam structure. The reaction forces can be calculated using a free body diagram of the entire beam.

Learn more about beam here:

brainly.com/question/21133992

#SPJ4

The momentum of the ball after being hit by the club can be calculated using the formula p = mv, where p is momentum, m is mass, and v is velocity. Since the force exerted on the ball is known (2380 N) and the time over which the force is exerted is also known (0.00100 s), we can use the formula F = ma to find the acceleration of the ball, where F is force, m is mass, and a is acceleration.

F = m*a

a = F/m

a = 2380 N / 0.0459 kg

The acceleration of the ball is 51760 m/s^2

Next, we can use the kinematic equation v = u + at to find the velocity of the ball, where v is final velocity, u is initial velocity and t is time.

v = u + at

u = 0 m/s (initial velocity)

t = 0.00100 s (time)

v = 0 + (51760 m/s^2)*(0.00100 s)

v = 5.176 m/s

Finally, we can use the momentum formula

p = m*v

p = (0.0459 kg)*(5.176 m/s)

p = 238.64 Ns (Newton second)

Therefore, the momentum of the ball after being hit is 238.64 Ns.

Answer:

1) ignition temperature- the minimum temperature that is required to start or cause combustion.

2) combustion - a chemical process in which a substance reacts rapidly with oxygen and gives off heat.

3) fuel - material such as coal, gas, or oil that is burned to produce heat or power.

4) calorific value of a fuel - the quantity of heat produced by its combustion – at constant pressure and under “normal” (standard) conditions

The density of seawater is 1025 kg per meter cube, the G is 9.8 m per second square, and the depth is 40 m, thus we switched to the power three pascal plus.

Why is it important for scuba divers to practice and be well-prepared before venturing into the ocean's depths?

You run the risk of passing out. The bends decompression sickness. If you rise from deep water to the surface too rapidly, this syndrome may develop. Your body emits nitrogen gas, which causes bubbles to form in your blood.

What pressure exists 100 meters under the water's surface?

Water pressure is 10bar at 100 meters below the surface. Although atmospheric pressure is 1 bar, the absolute pressure is 11 bar.

To know more about pascal visit:

https://brainly.com/question/12550364

#SPJ4

a) The amplitude of the oscillating electric field is 2.34453×10⁻⁶T.

b) The amplitude of the oscillating magnetic field is 703.359V/m.

The area in which magnetism acts, called the magnetic field, is where a magnetic substance or a moving electric charge is located. An illustration of the magnetic field that shows how a magnetic force is distributed both inside and outside of a magnetic material

µ₀ = Vacuum permeability = 4π×10⁻⁷H/m

I = Flux = 2800 W/m²

c = Speed of light is 3×10⁸m/s

The magnetic field's oscillation's amplitude

B₀ = √2µ₀I/c

B₀ = √2× 4π×10⁻⁷×2800/ 3×10⁸

B₀ = 2.34453×10⁻⁶T

The oscillating magnetic field's amplitude is 2.34453×10⁻⁶T

The electric field's oscillation's amplitude

E₀ = c ×B₀

E₀ = 3×10⁸× 2.34453×10⁻⁶

E₀ = 703.359V/m.

The oscillating electric field's amplitude is 703.359V/m.

To know more about electric field visit:

https://brainly.com/question/13770520

#SPJ4

a) The distance from the end of the string is calculated to be 0.24 m.

b) The wavelength of the string is 0.98 m.

c) The wavelength of the sound produced is 0.69 m.

Given that,

Length L₁ = 0.73 m

Frequency F₁ = 330 Hz

Frequency F₂ = 494 Hz

Let us find out L₂ using the relation, L₁ F₁ = L₂ F₂

Making L₂ as subject, we have,

L₂ = L₁ F₁/F₂ = (0.73 × 330)/494 = 240.9/494 = 0.49 m

The length from the end is said to be 0.73-0.49 = 0.24 m

Wavelength of the string is given by the formula, Δ = 2 L₂ = 2(0.49) = 0.98 m

Frequency of the wave = 494 Hz

We know the relation, V = Δ × f

where, Δ is wavelength

f is frequency

V is velocity

As we know, V = 343 m/s

Let us make Δ as subject, as place f value.

Δ = V/ f = 343/494 = 0.69 m

To know more about strings:

https://brainly.com/question/14700387

#SPJ4

Answer:

D.It allows scientists to make calculations more easily

Explanation:

For example; the number 0.00236 is written in scientific notation as 2.36×10−3 or as 2.36E-3. This helps mathematicians and scientists work easily with too large or too small numbers.

The magnitude of the charge on the ball is 0.467 μC.

The magnitude of the charge on the ball is calculated by applying Newton's second law of motion Coulomb's law as follows;

Mathematically, the formula for Newton's second law of motion and coulomb's law is given as;

F = mg

F = kq²/r²

where;

kq²/r² = mg

q² = ( mgr² ) / ( k )

q = √ ( mgr² / k )

The magnitude of the charge on the ball is calculated as follows;

q = √ ( 0.005 x 9.8 x 0.2² / 9 x 10⁹ )

q = 4.67 x 10⁻⁷ C

q = 0.467 x 10⁻⁶ C = 0.467 μC

Learn more about charge here: https://brainly.com/question/25923373

#SPJ1

The vertical plane mirror is a flat, vertical surface, usually made of glass or metal.

Virtual image is an optical illusion created by a lens or mirror. It is a two dimensional representation of an object which appears to be the same distance away from the lens as the original object. It is formed by the convergence of light rays that are not actually present, but seem to be originating from the image. Virtual images can be viewed on a screen or projected onto a wall. Virtual images cannot be projected onto a surface for viewing.

When you stand in front of it, the light from the object that you are looking at reflects off the mirror and creates an image of the object in the mirror. This is because light travels in straight lines and when it meets the mirror it bounces off it in the same direction.

When you are standing close to the mirror, the image of the object in the mirror is upright and appears to be the same height as the original object. This is because the light from the object is reflected off the mirror and reaches your eyes in a straight line. As you move away from the mirror, the distance between the object and the mirror increases and the light is no longer traveling in a straight line. The light is now traveling at an angle and this causes the image to appear tilted in the mirror. This tilt causes the image to appear shorter than the original object.

To know more about virtual image click-
https://brainly.com/question/23864253
#SPJ4

The sun has a mass of 1.9891 x 10^30 kg. The planet's orbital speed causes the earth to orbit the sun in an approximately circular orbit with a radius of 1.50*10^11m once every year.

A essential quality of a body is its mass. It was widely believed to be connected to the volume of matter in a physical body before to the atom's discovery and the development of particle physics. Theoretically, the same chemical might be included in different atoms and elementary particles. In celestial physics, an orbit is a curved path. Orbital velocity equals (9.424 x 1011 m)/31536000 s orbital velocity is 29883.307 m/s.

The Earth's orbital speed is therefore 29883.307 m/s.

There are 1.9891 x 10^30 kilogrammes in the sun.

Learn more about mass here

https://brainly.com/question/18064917

#SPJ4

The type of system in which mass and energy are constantly transferred in form, quantity, and location is a(n) open system.

An open system is a system that allows the exchange of energy and matter with its surroundings. The energy and matter can flow in and out of the system, and can change its form, quantity, and location. An open system is also known as a non-isolated system.

This statement is accurate for the patterns seen on the electromagnetic spectrum, which reveal patterns in which the frequency of radiation increases as the wavelength decreases.

The wavelengths are smaller and the vibrations are greater as you move from left to right. The relation among both wave and frequency is inverse in this case. (As one rises, the other falls.) This is due to the fact that the frequency of ALL electromagnetic waves is 300,000 km/s.

In increasing frequency and decreasing wavelength order, radio waves, microwaves, infrared, white spectrum, ultraviolet radiation, X-rays, gamma rays, and cosmic rays make up the full electromagnetic spectrum.

To know more about electromagnetic visit :

https://brainly.com/question/17057080

#SPJ4

Answer:

Explanation:

Friction between two surfaces is caused by the contact between them. When two surfaces interact, the roughness of the surfaces combine with the contact force to create a force that resists the motion of the surfaces. When two surfaces are moving relative to each other, the contact force must overcome the friction force in order for the surfaces to move.

Friction can be reduced by either reducing the contact force, or by making the surfaces smoother. One way to reduce the contact force is by using a lubricant, such as oil or grease, to reduce the amount of contact between the surfaces. This reduces the force of friction and allows the surfaces to move more easily. Another way is to make the surfaces smoother, which reduces the amount of roughness and therefore reduces the friction. This can be done with sandpaper or other abrasive materials.

The final velocity of the two vehicles as they move as a single mass is 18.42 m/s.

The total momentum of the two vehicles before the collision is:

momentum_initial = mass_suv ×velocity_suv + mass_car × velocity_car

The total momentum of the two vehicles after the collision is:

momentum_final = (mass_suv + mass_car) ×velocity_final

Since momentum is conserved, the initial momentum is equal to the final momentum:

momentum_initial = momentum_final

mass_suv × velocity_suv + mass_car × velocity_car = (mass_suv + mass_car) ×velocity_final

By substituting the given values, we can solve for the final velocity_final:

1217 kg * 20.8 m/s + 1087 kg * 14 m/s = (1217 kg + 1087 kg) * velocity_final

velocity_final = (1217 kg * 20.8 m/s + 1087 kg * 14 m/s) / (1217 kg + 1087 kg)

velocity_final = 18.42 m/s

The final velocity of the two vehicles as they move as a single mass is 18.42 m/s.

If you need to learn more about finding the velocity, click here

https://brainly.com/question/20668174?referrer=searchResults

#SPJ4

From the given circuit the current in resistor R is 2A, the resistance R is 5ohm,  the unknown emf E is 42V and if the circuit is broken at point x, the current in resistor R is zero.

Given the diagram, the voltage passing through resistor R (V) =  28V

The current passing through resistor R is = I1

The resistance of second resistor (R2) =6 ohm.

The current passing through R2 = 4A

The resistance of third resistor (R3) = 3 ohm

The current passing through R3 = 6A

The emf at resistor R2 = e

Here we can see that current passing through R3 is split into I1 and I2 such that I1 + I2 = I3. Then, I1 + 4 = 6A

I1 = 2A

(a) The current in resistor R = 2A

(b) From ohms law we know that V = IR. Then V1 - I3R3 -I1R1 = 0

28 - (3 x 6) - (2 x R) = 0. then R = 5ohm.

The resistance R = 5 ohm

(c) Similarly, e - (3 x 6) - ( 6 x 4) = 0

Then e = 42V

The unknown emf = 42V

(d) When the circuit is broken at x, that branch is eliminated from the circuit. It will stop carrying current. The distribution of currents and voltages in the other portions of the circuit will vary as a result.

To learn more about resistance click here https://brainly.com/question/29427458

#SPJ4

Answer:

Explanation:  First list the parameters

m = 54 g, d = 40 cm, v = 48 m/s, f =?

Then, convert the distance to meters

That is d = 40/ 100

d = 0.4 m

Now, let's find the force

f = ma

From the question, a is not given

Therefore, we find a

a = v/ t

a = 48 / 0.4

a = 120 m/s^2

Now, back to f

f = ma

f = 54 x 120

f = 6480N

When magnets are pushed together, the north poles of one magnet will repel the north pole of the other magnet, and the south pole of one magnet will repel the south pole of the other magnet. This is known as repulsion.

When magnets are let go after being pushed together, they will naturally move away from each other as the repulsion force is no longer being applied. This is known as "releasing."

When two magnets are brought close to each other, the invisible lines of magnetic force, called magnetic fields, interact with each other. Opposite poles, such as the north pole of one magnet and the south pole of another magnet, are attracted to each other. This phenomenon is known as attraction. On the other hand, similar poles, such as the north pole of one magnet and the north pole of another magnet, will push away from each other. This is known as repulsion.

When magnets are pushed together, the repulsion force between them is greater than the attraction force. This is why they will move away from each other when they are let go. However, if the magnets are very strong or if they are physically prevented from moving away from each other, they will not move away from each other when they are let go.

In addition to this, the strength of the magnetic field decreases as you move farther away from the magnet, so the farther apart the magnets are, the weaker the force of attraction or repulsion between them will be.

Learn more about magnets:

https://brainly.com/question/2841288

#SPJ4

The mass of the fish is 6.71kg.

First, we will calculate the angular speed of the system:

w = 2πf

where,

ω = angular speed = ?

f = frequency = 2.50 Hz

Therefore,

w = 2 π * 2.50

w = 15.7 rad/s

Now, we will use Hooke's Law to find out the spring constant of the spring:

K=f/Δx

where,

K = spring constant =?

F = force applied = maximum weight = 240 N

Δx = extension = 14.5 cm = 0.145 m

Therefore,

K=1655N/m

Now, we will use the formula for the angular speed of a spring-mass system to find out the mass of the fish:

w = [tex]\sqrt{k/m}[/tex]

m = k/w²

m = 1655/(15.7)²

m = 6.71kg

Hooke's law states that the amount of force applied to an elastic object is proportional to how far it stretches. However, if the object is overstretched it will not spring back. Hooke's Law only applies if an elastic object is not overstretched.

The letter k represents the “spring constant,” a number that essentially tells us how “stiff” a spring is. If you have a large value of k, that means more force is required to stretch it a certain length than you would need to stretch a less stiff spring the same length.

Thus, the mass of the fish is 6.71kg

To know more about Hooke's law:

brainly.com/question/2648431

#SPJ4

Answer: Yes!

Explanation: Think of a number graph. If we go right it will be positive and if we go left it'll be negative. Like this the velocity can me negative or positive based on the direction.

The fundamental frequency of the air column is 150 Hz.

The fundamental frequency of an air column in a pipe closed at one end is related to the frequency of the first harmonic (also known as the first overtone or the fundamental mode) by the equation:

f1 = (2Lc)/n

where L is the length of the air column, c is the speed of sound in air, and n is the harmonic number (1 for the fundamental frequency, 2 for the second harmonic, etc.).

If two consecutive harmonics of an air column have frequencies of 150Hz and 250Hz, we can use these frequencies to calculate the fundamental frequency by solving the equation for n=1 and n=2.

For n=1:

150Hz = (2Lc)/1

For n=2:

250Hz = (2Lc)/2

Dividing the two equations:

(250Hz * 2) = (150Hz * 1)

Lc = (150Hz * 1) / 2

And now we can calculate the fundamental frequency

f1 = (2Lc) / 1 = 2 * (150Hz * 1) / 2 = 150Hz

The fundamental frequency of the air column is 150 Hz.

Learn more about fundamental frequency in brainly.com/question/29264927

#SPJ1

If qa and qb are positive, and qc and qd are negative, and the magnitude of all charges is the same,then the net force on the positive charge q is zero

Charged material feels a force when it's exposed to a magnetic wave because of the physical property of electric charge. You can carry a positive or negative electric charge. Unlike charges attract each other while like charges repel one another.

Negatively charged electrons is pulled to positive-charged protons because opposing charges attract. Because of how they behave in an electric field, electrons are considered to be negative particles.

To know more about charge visit :

https://brainly.com/question/14950658

#SPJ4

With emission wavelengths ranging from 500 to 10,600 nm, all dental lasers now on the market can be classified as either visible or invisible (infrared) nonionizing radiation.

Most dental lasers work in the visible and ultraviolet ranges of the electromagnetic spectrum. The sign, with nm units, stands for the laser wavelength. It is dictated by the resonator length of the chip structure and the crystal material's bandgap. The wavelengths of ultraviolet radiation used in lasers range from 180 to 400 nanometers (nm). Radiation with wavelengths between 400 and 700 nm makes up the visible range. A particular kind of laser made for use in oral surgery or dentistry is known as a dental laser.

To learn more about wavelength click here https://brainly.com/question/13533093

#SPJ4

To determine the work done by a force on a particle, we need to consider the displacement of the particle and the angle between the force and the displacement vector.

When the force acts on a particle, it causes the particle to undergo a displacement. The work done by the force is equal to the magnitude of the force multiplied by the magnitude of the displacement vector, and then multiplied by the cosine of the angle between the force and displacement vector.

To find the work done by the force, you must first calculate the magnitude of the force, the magnitude of the displacement vector, and the angle between the force and displacement vector.

Once these three components have been calculated, the work done by the force can be calculated using the equation W = F * r * cos(θ).

To learn more about force, click here:

https://brainly.com/question/13191643

#SPJ4

The vertical height in which the runner’s center of mass is raised during the jump is 0.43 m.

The vertical height reached by the runner is calculated by applying the third kinematic equation as shown below.

Mathematically, the formula is given as;

v² = u² - 2gh

where;

at maximum height, the final velocity, v = 0

The vertical height reached by the runner is calculated as;

0 =  u² - 2gh

2gh = u²

h = u² / 2g

h = ( 2.9² ) / ( 2 x 9.8 )

h = 0.43 m

Learn more about vertical height here: https://brainly.com/question/27101452

#SPJ1