A bullet of inertia m traveling at speed v is fired into a wooden block that has inertia 4m and rests on a level surface. The bullet passes through the block and emerges with speed v/3, taking a negligible amount of the wood with it. The block moves to the right but comes to rest after traveling a distance d. What is the magnitude of the frictional force between the block and the surface while the block is moving?

Answers

Answer 1

The magnitude of the frictional force between the block and the surface while the block is moving is 9m.

The magnitude of the frictional force between the block and the surface while the block is moving can be determined using the principle of conservation of momentum.

When the bullet passes through the block, the total momentum of the system is conserved. The initial momentum of the bullet is mv and the initial momentum of the block is 0.

After the collision, the final momentum of the bullet is (1/3)mv and the final momentum of the block is (4m)(v/3). Setting the initial and final momenta equal, we can solve for the magnitude of the frictional force.

Initial momentum of the system = Final momentum of the system

mv + 0 = (1/3)mv + (4m)(v/3)

Simplifying the equation, we get:

mv = 2mv/9

Cancelling out the m and solving for v, we get:

v = 9m

Therefore, the magnitude of the frictional force between the block and the surface while the block is moving is 9m.

For more such questions on frictional force, click on:

https://brainly.com/question/30280752

#SPJ6


Related Questions

Two objects exert a gravitational force of 3 N on one another when they are 10 m apart. What would that force be if the distance between the two objects were reduced to 5 m?

  A. 1.5 N
  B. 6 N
  C. 12 N
  D. 24 N

Answers

force= Universal gravitational constant× Mass of object1(M)× m/r^2
3N=GMm/ 10^2
thus 6NN= GMm/5^2
Thus, 6n

A _____________ can be considered as an ultrathin beam of light that travels in a straight line until it meets a reflecting or refracting surface.

Answers

I believe the correct  answer is light ray.
According to its definition, a light ray is 'a line that is perpendicular to the light's wavefronts; its tangent is collinear with the wave vector.' When this ray meets a reflecting or refracting surface, it no longer travels in a straight line but rather changes its course.
Final answer:

A ray is an ultrathin beam of light that travels in a straight line until it meets a reflecting or refracting surface. Geometric optics is the branch of physics that models the path of light as straight lines called rays.

Explanation:

A ray can be considered as an ultrathin beam of light that travels in a straight line until it meets a reflecting or refracting surface. In physics, the path of light is often modeled as straight lines called rays in the field of geometric optics. When light encounters objects several times larger than its wavelength, it behaves like a ray with subtle wave characteristics.

Learn more about Ray of Light here:

https://brainly.com/question/33230870

#SPJ11

the density of maple wood is about 755.kg/m. What is the mass of a solid piece of maple that has a volume 640.cm?

Answers

I believe that the correct given values are:

density = 755 kg/m^3

volume = 640 cm^3

 

First let us convert volume to m^3 units.

volume = 640 cm^3 * (1 m / 100 cm)^3 = 6.4 x 10^-4 m^3

 

so the mass is:

mass = 755 kg/m^3 * (6.4 x 10^-4 m^3)

mass = 0.4832 kg = 483.2 g

Final answer:

The mass of the piece of maple wood is calculated to be approximately 0.4832 kg by rearranging the formula for density (D = M/V) to solve for mass (M = D*V), and then substituting in the provided density and volume values.

Explanation:

The student is asked to find the mass of a piece of maple wood, given its volume and density. We use the formula for density which is D = M/V, where D is the density, M is the mass, and V is the volume. To find the mass, we rearrange the formula to M = D*V. Given that the density of maple wood is about 755 kg/m³ and the volume is 640 cm³ (which is equivalent to 0.00064 m³), we calculate the mass as follows: M = 755 kg/m³ * 0.00064 m³ = 0.4832 kg.

Learn more about Density here:

https://brainly.com/question/29775886

#SPJ3

An automobile traveling along a straight road increases its speed from 72 ft/s to 84 ft/s in 180 ft. if the acceleration is constant, how much time elapses while the auto moves the 180 ft? answer in units of s.

Answers

Final answer:

The automobile taking approx. 178.54s (or around 3 minutes) while traveling 180ft is calculated using fundamental kinematic equations to determine constant acceleration and then time.

Explanation:

To solve this, we need to utilise some basic kinematic equations. First, let's find the acceleration using the formula a = (vf - vi)/s where vf = final velocity, vi = initial velocity, and s = displacement distance. Substituting in the provided values: a = (84ft/s - 72ft/s)/180ft = 0.067 ft/s².

Next, we use the equation t = (vf - vi) / a where t = time, vf = final velocity, vi = initial velocity, and a = acceleration. Substituting in the relevant values, we get t = (84ft/s - 72ft/s) / 0.067ft/s² ≈ 178.54s or approximately 3 minutes.

Learn more about Kinematic equations here:

https://brainly.com/question/24458315

#SPJ12

On a snowy day, max (mass = 15 kg) pulls his little sister maya in a sled (combined mass = 20 kg) through the slippery snow. when max pulls on the sled with 12 n of force, directed at an angle of 15° above the ground, how much work does max do on the sled as he pulls his sister 25 m in the snow?

Answers

Answer: 290 J

Explanation:

1) Data:

i) Max's mass = 15 kg

ii) Maya in a sled's mass = 20 kg

iii) slippery snow ⇒ no friction

iv) F = 12 N

v) α = 15°

vi) d = 25 m

2) Physical principles and formula

i) The mechanical workg, W, developed by a constant force, F, that has an angle α with the displacement d, is given by the formula:

W = F × d × cos(α).

ii) The mass of Max is not relevant for the problem, nor the mass of the sled, since the fact that there is not friction, results in that the only force acting is F (12 N, α = 12°).

3) Solution:

W = 12 N × 25m × cos (15°) ≈ 290 J

Work done by Max on the sled is about 290 J.

[tex]\texttt{ }[/tex]

Further explanation

Let's recall the Kinetic Energy and Work formula as follows:

[tex]\boxed {E_k = \frac{1}{2}mv^2 }[/tex]

Ek = kinetic energy ( J )

m = mass of object ( kg )

v = speed of object ( m/s )

[tex]\texttt{ }[/tex]

[tex]\boxed {W = F d}[/tex]

W = work done ( J )

F = force ( N )

d = displacement ( m )

Let us now tackle the problem!

[tex]\texttt{ }[/tex]

Given:

mass of Max = m = 15 kg

mass of Maya and sled = M = 20 kg

magnitude of force = F = 12 N

direction of force = θ = 15°

displacement = d = 25 m

Asked:

work done by Max = W = ?

Solution:

[tex]W = F_x \ d[/tex]

[tex]W = ( F \cos \theta ) d[/tex]

[tex]W = ( 12 \times \cos 15^o ) \times 25[/tex]

[tex]W \approx 290 \texttt{ J}[/tex]

[tex]\texttt{ }[/tex]

Conclusion:

Work done by Max on the sled is about 290 J.

[tex]\texttt{ }[/tex]

Learn moreVelocity of Runner : https://brainly.com/question/3813437Kinetic Energy : https://brainly.com/question/692781Acceleration : https://brainly.com/question/2283922The Speed of Car : https://brainly.com/question/568302

[tex]\texttt{ }[/tex]

Answer details

Grade: High School

Subject: Mathematics

Chapter: Energy

A wire with a resistance of 5.3 ω is drawn out through a die so that its new length is 4 times its original length. find the resistance of the longer wire, assuming that the resistivity and density of the material are unchanged.

Answers

The resistance of a wire is defined as
R = (ρL)/A
where
ρ = resistivity
L = length
A =  cross-sectional area

Before the wire is drawn, let 
L₁ = the length
A₁ =  the cross-sectional area.

The volume of the wire and its resistivity remain unchanged after it is drawn.
After it is drawn, the new length is
L₂ = 4L₁
To preserve the volume, the new cross-sectional area is
A₂ = (L₁A₁)/L₂ = (L₁A₁)/(4L₁) = A₁/4

The initial resistance is given as
R₁ = (ρL₁)/A₁ = 5.3 Ω

The final resistance is
[tex]R_{2}= \frac{\rho L_{2}}{A_{2}} = \frac{\rho (4L_{1})}{A_{1}/4} = 16 (\frac{\rho L_{1}}{A_{1}}) = 16*5.3 \, \Omega = 84.8 \, \Omega[/tex]

Answer: 84.8 Ω

Since resistance is based on cross-sectional area, the new wire would be thinner and its resistance will go up. Neglecting any change to the atomic structure of the wire, and a constant volume over the stretching, the cross section would be reduced by 4 times and its resistance would go up 4 times to 21.2 Ohms

The velocity of a spinning gyroscope drops from 12 rad/s to 6 rad/s due to deceleration of -1.2 rad/s^2. how much time expires during this process? how many radians does the top spin during the process?

Answers

5 seconds expired during the deceleration. Top rotated 45 radians during these 5 seconds. First, calculate the chance in velocity, by subtracting the initial velocity from the final velocity. So 6 rad/s - 12 rad/s = -6 rad/s So we lost a total of 6 rad/s. Divide that by the deceleration to give the number of seconds. So -6 rad/s / -1.2 rad/s^2 = 5 s So it takes 5 seconds for the deceleration to happen. The equation that expresses the number of radians performed under constant deceleration with an initial velocity is d = VT + 0.5 AT^2 where d = distance V = initial velocity T = time A = acceleration Substituting the known values gives. d = VT + 0.5 AT^2 d = 12 rad/s * 5s + 0.5 * -1.2 rad/s^2 (5s)^2 d = 60 rad -0.6 rad/s^2 *25s^2 d = 60 rad -15 rad d = 45 rad So the top rotated 45 radians while decelerating from 12 rad/s to 6 rad/s

Classify each of these soluble solutes as a strong electrolyte, a weak electrolyte, or a nonelectrolyte. drag each item to the appropriate bin.

Answers

Three of these are strong electrolytes: 
- HCl (Hydrochloric acid) 
- HNO3 (Nitric acid) 
- NaOH (Sodium hydroxide) 

Two of these are Weak electrolytes: 
- HF (Hydrogen fluoride) 
- HC2H3O2 (Acetic acid) 

And the other two are Non-electrolytes: 
- C6H12O6 (Glucose) 
- C2H5OH (Ethanol) 
Strong electrolytes: HCl, NaOH, HNO₃ Weak electrolytes: HF, HC₂H₃O₂ Nonelectrolytes: C₂H₅OH, C₆H₁₂O₆ Further explanation Electrolyte solutions are substances that produce ions when dissolved in water and can conduct electricity. A strong electrolyte is a solution that has the strongest electrical conductivity because the solute is completely ionized when dissolved in water. A weak electrolyte is a solution with low electrical conductivity and partially ionized. Nonelectrolytes are solutions that cannot conduct electric current because the solute cannot produce ions.

One of the most significant properties of water is its ability to dissolve a wide variety of substances. Solutions in which water is properly the dissolving medium are called aqueous solutions. For electrolytes, water comes by the most primary solvent.  

HCl = hydrochloric acid, a strong acid. HNO₃ = nitric acid, a strong acid .NaOH = sodium hydroxide, a strong base .HF = hydrofluoric acid, a weak acid .HC₂H₃O₂ or CH₃COOH = acetic acid, a weak acid .C₂H₅OH = ethanol, a nonelectrolyte .C₆H₁₂O₆ = glucose, a nonelectrolyte .

Notes:

Some acids ionize completely in water, some partially. Thus acids are not all of equal strength in terms of the production of H⁺ ions in solution. If an acid ionizes completely, it is strong acid. If we pass hydrogen chloride gas through water, almost all the molecules ionize to give H⁺ and Cl⁻ ions. Hence, HCl is a strong acid.  If an acid ionizes partially, on the other hand, it is a weak acid. In the ionization of weak acids, some of the ions recombine and remain as molecules. HF is a weak acid. If we pass hydrogen fluoride gas through water, some of it will ionize to give H⁺ and F⁻. Most of the dissolved hydrogen fluoride will remain as HF molecules in water. Bases that completely ionize in water are called strong bases. The bases of alkali metals and some alkaline earth metals are strong, e.g., NaOH, KOH, and Ba(OH)₂. They conduct electricity well in an aqueous solution. Bases that dissociate in water slightly are weak bases, e.g., Mg(OH)₂ and NH₃. Water solutions of weak bases are poor conductors of electricity. Learn more About the solution as a homogeneous mixture  https://brainly.com/question/637791 Calculating the pH value of weak base https://brainly.com/question/9040743 Flammability as one of the chemical properties https://brainly.com/question/1767022

Keywords: classify, each of these soluble solutes, as a strong electrolyte, a weak, a nonelectrolyte. drag each item to the appropriate bin, acids, bases, dissolve, ionize, conduct electricity, water

Calculate the acceleration if you push with a 20-N horizontal force against a 2-kg block on a horizontal friction- free air table

Answers

10 meters per second. The formula is F = ma, so to solve we substitute 20 for F, 2 for m and then solve for a. 20 divided by 2 - 10, therefore the acceleration is 10 meters per second.

If the total dissipated power is to be reduced by 10%, how much should the voltage be reduced to maintain the same leakage current? note: power is defi ned as the product of voltage and current

Answers

Final answer:

To reduce the dissipated power by 10% while maintaining the same leakage current, the voltage needs to be reduced in such a way that the new power dissipation equals 90% of the original power, due to the direct proportionality between power and voltage in the formula P = IV.

Explanation:

The question asks: If the total dissipated power is to be reduced by 10%, how much should the voltage be reduced to maintain the same leakage current? Power dissipation in an electrical circuit is described by the formula P = IV, where P is the power in watts, I is the current in amperes, and V is the voltage in volts.

To find the new voltage required to reduce the power dissipation by 10%, we first have to understand that if the leakage current remains constant, the power reduction is directly proportional to the reduction in voltage. Given the initial power Pm = 1.0 × 10³ W, reducing this power by 10% results in Pnew = 0.9Pm = 0.9 × 1.0 × 10³ W.

Since P = IV and I remains constant, the new power equation after reduction can be written as 0.9Pm = I × Vnew. Substituting the values and assuming the initial current remains unchanged, we solve for Vnew, resulting in a voltage reduction proportionate to the desired 10% power reduction.

When the ground gets warm, it emits an invisible type of light called infrared light. This light can travel into the atmosphere and heat the air that it encounters.

What type of heat transfer is described above

Answers

Radiation. However it isn't exclusively radiation; the warm ground tends to warm the air next to the ground (conduction) and the warm air rises and mixes with the cool air above (convection) so all three methods of heat transfer are used

Answer:

Radiation

Explanation:

Infrared radiation, that portion of the electromagnetic spectrum that extends from the long wavelength, or red, end of the visible-light range to the microwave range. ... Most of the radiation emitted by a moderately heated surface is infrared; it forms a continuous spectrum.

What is the kinectic energy of 150kg object that is moving at 72 m/s

Answers

k.e = ½mv² = ½×150×72 = 75×72 = 5400joules

the answer it actually 388800

A dog in an open field runs 11.0m east and then 30.0 m in a direction 55.0 west of north
In what direction must the dog run to end up 10.0m south of her original starting point?

Answers

The direction of the resultant displacement of the dog is determined as 58.2⁰.

How to calculate the direction of the resultant displacement?

The direction of the resultant displacement of the dog is calculated by applying the following formula as shown below.

The sum of the x - component of the displacement;

Dx = 11 m  - 30 m x cos(55)

Dx = - 6.21 m

If the dog must end the run 10 m south of her original starting point, then the resultant displacement in y - direction is 10 m.

Dy = - 10 m

The direction of the resultant displacement of the dog is;

tan θ = Dy / Dx

tan θ = -10 / -6.21

tan θ = 1.61

θ = arc tan (1.61)

θ = 58.2⁰

A system absorbs 186 kj of heat and the surroundings do 110 kj of work on the system. what is the change in internal energy of the system? express the internal energy in kilojoules to three significant figures.

Answers

Final answer:

The change in internal energy of the system is 296 kJ, calculated using the first law of thermodynamics by adding the heat absorbed by the system (186 kJ) to the work done on the system by the surroundings (110 kJ).

Explanation:

The question involves the concept of change in internal energy of a system which is a part of thermodynamics in Chemistry. To determine the change in internal energy, we use the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (Q) added to the system minus the work (W) done by the system on the surroundings.

In this case, the system absorbs 186 kJ of heat and the surroundings do 110 kJ of work on the system. As work is done on the system, it is treated as positive input of energy. Therefore, the change in internal energy (ΔU) for the system can be calculated as follows:

ΔU = Q + W

ΔU = 186 kJ + 110 kJ

ΔU = 296 kJ

The change in internal energy of the system is 296 kJ, assuming all quantities are in the same units (in this case, kilojoules).

Which device converts electrical energy into kinetic energy?

an electric generator
an electric motor
a step-down transformer
a step-up transformer

Answers

Answer;

Electric motor

Explanation;Energy is the ability to do work. According to the law of conservation of energy, energy can not be created nor destroyed but can be changed from one form to another.Changing energy from one form to another is done by devices we call transducers. These are elements that convert energy from one form to another.In this case, electrical motor is an example of a transducer that converts electrical energy to kinetic energy. Electrical energy is supplied to a the motor which converts it to rotational energy or mechanical energy then to kinetic energy.

Answer:

A). Electric generator

Explanation:

One part of a freely swinging magnet always points
a. east.
b. to Earth’s geographic north pole.
c. toward Earth’s core.
d. to Earth’s magnetic pole in the Northern Hemisphere.

Answers

One part of a freely swinging magnet always points to the Earth's magnetic pole in the Northern Hemisphere.

Answer: The correct answer is (d).

Explanation:

Magnet has two poles: South pole and North pole. The same poles of the magnets repel each other. The opposite poles of the magnets attract each other.

In the absence of other magnet, a freely swinging magnet points in North-South direction. The earth has a magnetic field. The magnetic field of the bar magnet is same as the magnetic field of the earth's magnet.

The position of  the earth's magnetic poles are not fixed. The south pole of the earth's magnet lies in the geographic north as it attracts the north pole of the freely swinging magnet.

If one part of a freely suspended magnet always points to Earth's magnetic pole in the Northern Hemisphere.

A power station delivers 510 kw of power at 12,000 v to a factory through wires of total resistance of 2.5 ω. how much less power is wasted if the electricity is delivered at 47,000 v rather than 12,000 v?

Answers

The currents (Amperes) in the two cases are calculated as power/voltage: 

510000W / 12000V = 42.5 A 
510000W / 47000V = 10.85 A 

And that the power wasted in the two cases is calculated as current^2 x resistance:

(42.5 A)^2 (2.5 Ohms) = 4,515.625 W 
(10.85 A)^2 (2.5 Ohms) = 294.30625 W 

So the amount of power saved is the difference:
4,515.625 - 294.30625  = 4221.32 Watts

This is the main reason why distribution grids aim to operate at the highest voltages possible.

Which property do metalloids share with nonmetals?

Both are brittle.
Both are shiny.
Both have low melting points.
Both are very conductive.

Answers

Answer: Both are Brittle

Explanation:

Metals are lustrous, malleable and ductile. Metals are good conductors of heat and electricity.

Non-metals are poor conductors of heat and electricity. Non-metals are brittle and non-lustrous elements.

Elements which have properties between metals and non-metals are known as metalloids.

Some mettaloids are lustrous and conductors of electricity. One property that these elements share with non-metals is that these are brittle i.e. they can easily break.

The property metalloids share with nonmetals is [tex]\boxed{{\text{Both are brittle}}}[/tex].

Further explanation:

Nonmetals:

Elements that gain electrons in a chemical reaction are non-metals. They are the electronegative element that has high ionization energy. Non-metals are either gas, liquid or solid. Nonmetal oxides react with bases and form salts.

Properties of Nonmetals:

Physical State: Most non-metals exist in the form of gas and solid. The exception includes bromine that exists as liquid at room temperature.

Non-Malleable and Ductile: They are brittle and cannot be transformed into wires.

Conduction: Poor conductor of heat.

Luster: Non-metals have no metallic luster.

Melting and Boiling Point: Melting point of non-metals is lower than metals. Also, it is highly variable.

Metalloid:

An element that is a mixture of metals and nonmetals is called metalloids. The six known metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium.

Properties of Metalloids:

Metalloids are metallic brittle solids.

Mostmetalloids are semiconductors and thermal conductors.

Some metalloids conduct electricity like metals.

1. Metalloids are brittle and also nonmetals are very brittle. Hence, both metalloids and nonmetals have this property. Hence option 1 is correct.

2. Metalloids can be either shiny or dull but nonmetals are dull. Hence, option 2 is incorrect.

3. Metalloids have melting points as similar to metals whereas nonmetals have melting points lower than metals. Hence, option 3 is incorrect.

4. Some metalloids conduct electricity like metals whereas nonmetal does not conduct electricity. Hence, option 4 is incorrect.

Learn more:

1. Calculate the equilibrium constant of pure water at  ? https://brainly.com/question/3467841

2. Calculate the wavelength of the electron: https://brainly.com/question/6352445

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Metals and non-metals

Keywords: metalloids, brittle, lustrous, conductors, melting point, nonmetals, low, metals, high and shiny.

. Why must the cyclist accelerate before reaching the hillock?

Answers

Short answer:

So that the cyclist does not slide back down

 

Long answer:

The main forces a cyclist must conquer are air resistance and gravity. Air resistance increases exponentially with speed. In the switch from cycling on a flat road to hiking a hill, the decreased speed reduces air resistance to the point where drafting other riders offers small benefit. At this point, smaller cyclists, who have finer power-to-weight ratios, will be able to break away from the peloton. Climbing skill can be improved by minimizing weight, and also by pedalling at a constantly elevated rhythm. Large cyclists can attain greater downhill speeds, but on mountainous courses smaller cyclists still have a benefit. 

If the pulley was not set so that the string was parallel to the track, what effect would this have on the acceleration of the system? what effect would this have on the normal force from the track? would this be a random or systematic error? explain your reasoning.

Answers

the string would affect it .......

Final answer:

If the pulley is not set parallel to the track, it will introduce a perpendicular component of the tension force, resulting in a reduction in the acceleration of the system. The normal force from the track will also increase, opposing the motion. This would be a systematic error as it stems from a consistent deviation from the correct setup.

Explanation:

If the pulley is not set so that the string is parallel to the track, it will introduce a component of the tension force that is perpendicular to the track. This perpendicular component will result in a normal force from the track which will oppose the motion of the system. Consequently, the acceleration of the system will be reduced. This effect can be understood by breaking down the tension force into components parallel and perpendicular to the track.

When the string is not parallel to the track, let's say at an angle theta, the tension force can be resolved into two components:

1. A component parallel to the track (T_parallel = T * cos(theta))

2. A component perpendicular to the track (T_perpendicular = T * sin(theta))

The parallel component (T_parallel) is responsible for providing the force that accelerates the system. The tension force is equal to the product of mass and acceleration (T_parallel = m * a). Therefore, any decrease in the parallel component of the tension force will result in a decrease in acceleration.

The perpendicular component (T_perpendicular) introduces a force perpendicular to the track, which is counterbalanced by the normal force from the track. As the angle theta increases, the normal force increases, opposing the motion and reducing the acceleration of the system.

This would be a systematic error because it is a consistent deviation from the correct setup. Systematic errors occur due to flaws in the experimental setup or technique. In this case, the error arises from the misalignment of the pulley and the track.

A ball thrown horizontally at vi = 30.0 m/s travels a horizontal distance of d = 55.0 m before hitting the ground. from what height h was the ball thrown?

Answers

Final answer:

To find the height from which the ball was thrown, we can use the equations of motion for projectile motion. The ball was thrown from a height of 44.1 meters.

Explanation:

To find the height from which the ball was thrown, we can use the equations of motion for projectile motion. Since the ball is thrown horizontally, the initial vertical velocity is 0. We can use the equation h = (1/2) g t^2, where h is the height, g is the acceleration due to gravity, and t is the total time the ball is in the air.

Using the given values, we can substitute g = 9.8 m/s^2 and t = 3 s into the equation to solve for h: h = (1/2) * 9.8 m/s^2 * (3 s)^2 = 44.1 m.

Therefore, the ball was thrown from a height of 44.1 meters.

"recall that the speed of sound in water is 1507 meters/second (4944 feet/second). if a sonar sounding had a total travel time of 5 seconds, what is the water depth?"

Answers

If the sonar total travel time is 5 second, then it must be travel down for 2.5 seconds then travel up for another 2.5 seconds. Then, to find the water depth, you need to multiply the sound speed with the duration. The calculation would be:

1507m/s * 2.5s= 3767.5 meter

A wheel which is initially at rest starts to turn with a constant angular acceleration. after 4 seconds it has made 4 complete revolutions. 1) how many revolutions has it made after 8 seconds?

Answers

In order to make 4 complete revolutions in 4 seconds, the wheel must have a constant angular acceleration of 144° (or 2.5 radians) per square second, hence after 8 seconds the wheel will have made 14,4 revolutions, or 5184° in total.

What was a key feature of the roman confederation?

Answers

The key feature of the Roman Confederation is giving status to the people living in their territory. It gave people rights and social roles in their society. It guides them on how and what they should do. It also gave people sovereignty by allowing to vote, participate in government duties as well as gave them rights.

Ella has a mass of 56 kg, and Tyrone has a mass of 68 kg. Ella is standing at the top of a skateboard ramp that is 1.5 meters tall. Which conclusion is best supported by the given information?

If Tyrone stands at the top of the same ramp, his potential energy will be less than Ella’s.
If Tyrone stands at the top of a 1 m high ramp, his potential energy will be greater than Ella’s.
If Tyrone stands at the top of the same ramp, his potential energy will be the same as Ella’s.
If Tyrone stands at the top of a 2 m high ramp, his potential energy will be greater than Ella’s.

Answers

D because if you are heavier and standing higher up then you will have greater potential energy than someone who weighs less and is standing at a  lower height.

THE ANSWER IS D YOUR WELCOME:)

Calculate the pressure of an enclosed fluid on which a force of 150 N is exerted over an area of 10 cm2. give the answer in pascals.

Answers

The pressure of the enclosed fluid is 150000Pa

The pressure of an enclosed fluid on which force is applied is 150 N over an area of 10 cm² will be 1500 N/m² or 1500 Pa.

What is Pressure?

In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a particular location within a confined fluid The force divided by the area over which it is exerted, or one-half pound per square inch, determines the pressure that a 42-pound box with an 84-square-inch bottom will impose on a surface.

Atmospheric pressure, which at sea level is roughly 15 pounds per square inch, is the amount of weight that the atmosphere exerts on each unit area of the Earth's surface. One pascal equals one newton per square meter when expressed in SI units, which is how pressure is calculated.

According to the question :

Pressure, P = F / A

P = 150 N

A = 10 cm² or

A = 0.1 m²

P = 150 / 0.1

P = 1500 Pa.

Hence, the Pressure on the enclosed fluid is 1500 Pa.

To get more information about Pressure :

https://brainly.com/question/15175692

#SPJ2

Which word is described by this riddle poem. (hint: jails and phones)


My first is in cars but isn't in bars
My second's in dance,but not in pants
My third is in lame, my fourth is the same.
What word could i possibly be?

Answers

cell is the answer because cell phone and jail cell that both work

If you drop a silver dollar off a building and it hits the ground in 10 seconds, how fast was the coin going just before?

Answers

v = u + at 
= 0 + (9.81)(10) 
= 98.1m/s 

Ignoring air resistance.

A group of students were collecting soil samples near a river. One student noted there was a lot of sand in one of the samples. He said" All this sand must have washed up from beach where the river enters the ocean." Another student said, "I think it came from the rocks in the mountains. But there aren't any mountains near us. I don't understand how the sand got there." What would you tell the students to help them solve where the sand came from?

Answers

You would tell them that sand comes from weathered rocks that have been eroded by water over time. Since there must be rocks by the river and the water is always moving along it, the rocks must have gotten weathered and turned into sand. That's where the sand comes from. 

Keeping in mind the kinetic energy of a moving vehicle, how can a driver best prepare to enter sharp curves in the roadway?

Answers

A driver can best prepare themselves to enter a sharp curve in the roadway by slowing down. This will decrease the vehicle's kinetic energy, making it easier to control on the road. 
Other Questions
I am k years old and my daughter is y years younger.What is the sum of our ages?What will be the sum of our ages next year?What will be the difference of our ages next year?The sum of our ages is , the sum of our ages next year will be , the difference of our ages next year will be One day after we left a shop I said under my breath, I wish you wouldnt do that, telling everybody Im your daughter. My mother stopped walking. Crowds of people with heavy bags pushed past us on the sidewalk, bumping into first one shoulder, then another. Aiii-ya. So shame be with mother? She grasped my hand even tighter as she glared at me. I looked down. Its not that, its just so obvious. Its just so embarrassing. Embarrass you be my daughter? Her voice was cracking with anger. Thats not what I meant. Thats not what I said. What you say? I knew it was a mistake to say anything more, but I heard my voice speaking, Why do you have to use me to show off? If you want to show off, then why dont you learn to play chess? My mothers eyes turned into dangerous black slits. She had no words for me, just sharp silence. What is the primary conflict occurring in this excerpt? internal: Lindo vs. Meimei external: Meimei vs. Meimei internal: Meimei vs. Meimei external: Lindo vs. Meimei When you have a severe fever, what may be a grave consequence if this is not controlled? A Recipe for party mix calls for 3/4 cup of cereal , 1/4 Cup of walnuts, 5/8 cup of crackers , and 1/2 cup of raisins . determine the number of cups in the mix. write the answer in the simplist form ? A. 2 1/8B. 1 1/8C. 10/18D. 17/8 Where did Emanuel Leutze get ideas for his painting, Washington Crossing the Delaware? You are going to bake an over-sized sheet cake. The recipe calls for 2 cups of sugar for every 3 cups of flour. How many cups of flour are needed if you use 18 cups of sugar? Select the forms or examples of solar energy:heat energysolar ovenrock sedimentspetroleumcoallight energythere is more than one answer (tco 5) _____ is defined as a pathway for the flow of authority from one management level to the next. The enzymes of the krebs cycle function in the cytosol of bacteria but among eukaryotes the enzymes function mostly in the mitochondria. pose a scientific question that connects the subcellular location of the enzymes of the krebs cycle to the evolution of eukaryotes. which material did Egyptian and Roman artist paint frescos on?A.) PaperB.) woodC.) plasterorD.) silk True or false earthquakes and volcanic eruptions always occur along plate boundaries If a radical is multiplied by a number or variable, you should put the number or variable _____ the radical sign. In what country and continent did the renaissance began in Which inference is most supported by the passage?wealhtheow is more interested in wealth and power than she is in the safety of her people.wealhtheow is not pleased that beowulf and his men have arrived to fight with grendel.wealhtheow is nervous speaking in front of beowulf and his men because she is afraid of them. wealhtheow has not been impressed by the men who have fought grendel up to this point? Dos elementos se encuentran en este verso "que ecos mil discurre, enzordeciendo" analiza como se representan estas dos oposiciones use prime factorization to find gcf of 57 and 27 What country claimed the largest amount of land in the America The cerebellar ________ receives somatosensory information and influences the vestibulospinal and reticulospinal tracts. dentate nucleus pontine nucleus vermis flocculonodular node intermediate and lateral zones Paula is a regular at gino's italian bistro. she likes going there because the staff always recognizes her, greets her by name, and makes her feel welcome at the restaurant, so she feels an emotional connection with the staff and the restaurant. this is an example of the ________ component of her attitude toward gino's. situational cognitive conative perspective affective Which sentence correctly identifies an adjective clause?Question 4 options:While you load the washing machine, I'll load the dryer.The paper towels that Dad bought have a flowered pattern.I had never seen a play until my grandparents took me to Los Angeles.After the tomato plants were watered, they grew much faster Steam Workshop Downloader