an object is moving on a horizontal frictionless surface. if the net force applied to the object in the direction of motion is doubled, the magnitude of the acceleration of the object is
1. halved
2. doubled
3. unchanged
4. quadrupled

Answer:

The part of an experiment that is not being tested but is used for comparison is the controls or the controlled variables.

Answer:

4000N left

Explanation:

6000N-1000N-1000N

6000N-2000N

8000N

This experiment help us understand their behavior as well as how the people will cop up with the rules and regulation the society wants to apply on them

In a two-week simulation of a prison setting, the Stanford prison experiment was meant to look at the impact of situational factors on participants' responses and behaviors.

Hence, this experiment allows us to better understand their behavior, as well as how individuals will respond to the laws and regulations imposed by society.

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The energy of the ejected photoelectron is 1.89 eV.


Energy of radiation, E = 4.2 eV Work function of photocell, φ = 2.31 eV

Energy of ejected photoelectron is given by the difference of the energy of incident radiation and the work function of the metal. That is, KE = hυ - φ where, h is Planck's constant, υ is the frequency of radiation, c = λυ is the speed of lightλ is the wavelength of radiation and c is the speed of light.

From the energy formula of radiation, E = hυE = hc / λ, by substituting h and c values

KE = hc / λ - φ

Given, h = 6.626 x 10^-34 J-s, c = 3 x 10^8 m/s

λ = hc / E

= (6.626 x 10^-34 J-s x 3 x 10^8 m/s) / (4.2 eV x 1.6 x 10^-19 J/eV)

= 4.93 x 10^-7 m

KE = hc / λ - φ

= (6.626 x 10^-34 J-s x 3 x 10^8 m/s) / (4.93 x 10^-7 m) - (2.31 eV x 1.6 x 10^-19 J/eV)

= 1.89 eV

Therefore, the energy of the ejected photoelectron is 1.89 eV.

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Answer:

8.89 m/s

Explanation:

rate = distance/time

40m/4.5 sec = 8.8888889 m/s

For a person running 1 km, faster speed requires more total energy.

What does kinetic energy mean?

Kinetic energy is the energy possessed by an object caused by the force of motion. Therefore, an object moving at a certain speed must have kinetic energy, while an object that is not moving does not have kinetic energy.

According to the given question:

Total energy comprises of kinetic energy and potential.

Since in running potential energy is zero, only kinetic energy is at play.

Kinetic energy is also called motion energy, where the movement of an object can produce other energy.

Hence, faster the speed of the object, more energy required in the form of Kinetic Energy.

Complete question:

A person runs 1 km. How does his speed affect the total energy needed to cover this distance?

A. A faster speed requires less total energy.

B. A faster speed requires more total energy.

C. The total energy is about the same for a fast speed and a slow speed.

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Work done required to overcome friction is 696.96 J. Efficiency of work is 95.5 %.

Work is done when a force does displacement in an object in the direction of the force. The energy required to do work translates into work. Its converse is also true. Work done gets stored in the form of potential energy.

Work = Force × displacement in the direction of the force

Work is a scalar quantity even though it is the dot product of two vector quantities - force and displacement.

Total distance to be displaced = 6.40m + 1.28m

= 7.68m

Net force acting on the barrel = 95-4.25 N

= 90.75 N

So, W = F × S

= 90.75 ×7.68 J

= 696.96 J

Efficiency of work = (output/ input ) × 100

     If there would be no weight force and no friction, then amount of work would be =  95 × 7.68 J

                          = 729.6 J

So, efficiency of work = (696.96 / 729.6 ) × 100

                                    =  95.5%

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Answer:

456

Explanation:

impulse = Force x (time of contact)

this isn't really much information but hope this helps !: )

Answer:

It has low frequency and can travel through a vacuum

Explanation:

C.

Explanation:

Using conservation of momentum

  the bullets momentum   must equal the rifle's momnetum

5 000 gm * v  = 50 gm * 100 m/s

v = 1 m/s

Hi there!

Acceleration:

a = Δv / Δt, so:

a = 20/9 ≈ 2.22 m/s²

Displacement:

We can use the equation Δd = v₀t + 1/2at² to solve. (Initial velocity is 0).

Δd = 1/2at²

Plug in the acceleration and time:

Δd = 1/2(2.22)(9)² ≈ 89.91 m

A 15 kg flywheel has all its mass around its outer rim. A string is wrapped around it and a m = 3.7 kg weight is hanging on the string. The flywheel has radius R = 0.25 m.

a) When the 3.7 kg weight is dropping with a speed of 1.7 m/s,  the angular velocity of the flywheel 6.8 rad/s.

b) When the 3.7 kg weight is moving with a speed of 1.7 m/s,  the kinetic energy of the entire system is 22.5 J.

c) If the system started from rest, the height weight fallen is 0.719 m

d)  the angular acceleration at this point is 39.2 rad/s².

a) Angular velocity of the flywheel is given by :

w = v / r

Where, w = angular velocity of flywheel v = velocity of weight R = radius of flywheel

Therefore,w = v / r = 1.7 m/s / 0.25 m = 6.8 rad/s

Therefore, the angular velocity of the flywheel is 6.8 rad/s.

b) Kinetic energy of the entire system is given by :

K.E. = 1/2 * I * w²

Where, I = moment of inertia = mass of the flywheel * radius²

Thus,I = 15 kg * (0.25 m)²I = 0.9375 kg.m²

Therefore, K.E. = 1/2 * I * w²= 1/2 * 0.9375 kg.m² * (6.8 rad/s)²= 22.5 J

Therefore, the kinetic energy of the entire system is 22.5 J.

c) Potential energy of the weight at the top of the wheel is given by:

U = mgh

Where, m = mass of the weight = 3.7 kg g = acceleration due to gravity = 9.8 m/s² h = height fallen

Thus,U = 3.7 kg * 9.8 m/s² * h

Therefore, h = U / (mg) = (1.7 * 3.7 * 9.8) / (15 * 9.8)= 0.719 m

Therefore, the height fallen by the weight is 0.719 m

d) At this point, angular acceleration is given by:

a = alpha * r

Where, alpha = angular acceleration of flywheel

Therefore, alpha = a / r = g / r= 9.8 m/s² / 0.25 m= 39.2 rad/s²

Therefore, the angular acceleration at this point is 39.2 rad/s².

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Answer:

The new force will be 4times the original

Explanation

An Ampere is in the SI base unit of electric current equal to one coulomb per second.

and remember that the charge of an electron is

Step 1

a) let

so

b) now , to find the number o f electrons , divide the total a}charge by the charge of an electron

therefore, the answer is

I hope this helps you

The magnitude of the acceleration of the electron is 3.34797e+32 m/s².

The speed of the electron after 7.50 ✕ 10−9 s is 2.24097e+31 m/s.

(a) The magnitude of the acceleration of the electron is:

a = E / m = 305 N/C / 9.11e-31 kg

a = 3.34797e+32 m/s²

where:

a is the acceleration of the electron (m/s²)

E is the magnitude of the electric field (N/C)

m is the mass of the electron (kg)

(b) The electron's speed after 7.50 ✕ 10−9 s is:

v = at = 3.34797e+32 m/s² * 7.50e-9 s

v = 2.24097e+31 m/s

where:

v is the speed of the electron (m/s)

a is the acceleration of the electron (m/s²)

t is the time (s)

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Answer:

Mass of water: 43 g

Explanation

hope it helps

Answer:

4 m/s

Explanation:

10/2.5= 4 m/s

Answer:

79 N     ( the same)

Explanation:

Spring constant of the clutch spring is 60000 N/m.

We know maximum force of static friction between the clutch and flywheel is 6000 N and the coefficient of friction is 0.25. Therefore, the maximum force that can be exerted by the spring is:

F = μsN

where μs is the coefficient of static friction and N is the normal force.

N = Fspring

where Fspring is the force exerted by the spring.

Substituting these values into the equation we have:

F = μsFspring

Fspring = F/μs = \(6000 N / 0.25 = 24000 N\)

Now we can use the formula for spring constant to find k:

\(k = Fspring / x = 24000 N / 0.4 m = 60000 N/m\)

Therefore, the spring constant of the clutch spring is 60000 N/m.

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A battery is connected to two capacitors shown below. the capacitors have air between the plates. The total charge coming out of the power supply: 8.16 × 10⁻⁹ C.

Capacitor 1 has a plate area of 1.5 cm² and an electric field between its plates of 2000 V/m and Capacitor 2 has a plate area of 0.7 cm² and an electric field of 1500 V/m.

Therefore, the total charge coming out of the power supply can be calculated by using the following formula:

Q = C × V,

where Q is the total charge coming out of the power supply.

C is the capacitance of the capacitors.

V is the voltage of the capacitors.

The capacitance of a parallel plate capacitor can be calculated by using the following formula:

C = εA/d,

where C is the capacitance of the capacitor.

ε is the permittivity of air.

A is the area of the capacitor plates.

d is the distance between the plates of the capacitor.

let's calculate the capacitance of the capacitors:

For capacitor 1:

ε = ε₀ = 8.85 × 10⁻¹² F/m²

A = 1.5 cm² = 1.5 × 10⁻⁴ m²d = ?

E = 2000 V/mQ = CV

C = εA/dC₁ = ε₀A/d

C₁ = ε₀A/E₁

C₁ = ε₀A/(V/d)

C₁ = (ε₀A/d) × V⁻¹

C₁ = ε₀A₁/E₁

C₁ = (8.85 × 10⁻¹² F/m²)(1.5 × 10⁻⁴ m²)/(2000 V/m)

C₁ = 6.63 × 10⁻¹⁰ F

For capacitor 2:

ε = ε₀ = 8.85 × 10⁻¹² F/m²

A = 0.7 cm² = 0.7 × 10⁻⁴ m²

d = E = 1500 V/m

Q = CV

C = εA/d

C₂ = ε₀A/d

C₂ = ε₀A/E₂

C₂ = (8.85 × 10⁻¹² F/m²)(0.7 × 10⁻⁴ m²)/(1500 V/m)

C₂ = 3.95 × 10⁻¹¹ F

Total charge coming out of the power supply: Q = C₁V + C₂VQ = (6.63 × 10⁻¹⁰ F)(12 V) + (3.95 × 10⁻¹¹ F)(12 V)Q = 8.16 × 10⁻⁹ C. Therefore, the total charge coming out of the power supply is 8.16 × 10⁻⁹ C.

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Answer:

Yes.

Explanation: the magnitude of the force is extremely small because the masses of the students are small relative to Earth's mass.

The gravitational force between two students sitting in classroom exists but its effect are not visible because the distance between these students is very very very small.

We have two students sitting in a classroom.

We have to investigate whether or not there is gravitational force between these two students.

Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Mathematically -

\($F=\frac{GMm}{r^{2} }\)

According to the question, we have - Two students sitting in a classroom.

Take a close look and you will identify that the distance between any two students in classroom is very small. Gravitational force is also the weakest force since the value of Universal gravitation constant (G) = 6.674 x \(10^{-11}\) \(m^{3}kg^{-1}s^{-2}\) is very small. Moreover, the force of gravitation is inversely proportional to square of distance between two bodies -

\($F \alpha \frac{1}{r^{2} }\)

This will make the gravitational force even more weak. This is the main reason why you don't observe any effects of this force. The gravitational force exists between any two bodies that have mass and energy, but its magnitude might depend upon other factors to.

Hence, the gravitational force between two students sitting in classroom exists but its effect are not visible because the distance between these students is very very very small.

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The total energy of an electron traveling at a speed of 8.60 x 10^7 m/s is (3.68 x 10^-15) J.

The total energy of an electron can be calculated by the formula E=0.5mv², where E is the total energy, m is the mass of the electron and v is the velocity of the electron. We know that the speed of the electron is 8.60 x 10^7 m/s. The mass of an electron is 9.109 x 10^-31 kg.Using the formula, we can calculate the total energy as follows:E = 0.5 x (9.109 x 10^-31 kg) x (8.60 x 10^7 m/s)²E = 3.68 x 10^-15 JTherefore, the total energy of an electron traveling at a speed of 8.60 x 10^7 m/s is (3.68 x 10^-15) J. The total energy is dependent on the velocity of the electron and the mass of the electron.

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When the momentum of an object is increased by a factor of 4 in magnitude, the kinetic energy of the object is changed by a factor of 16. Here option A is the correct answer.

The kinetic energy of an object is given by the equation KE = (1/2)mv², where m represents the mass of the object and v represents its velocity.

The momentum of an object is defined as p = mv, where p represents the momentum, m is the mass, and v is the velocity.

If the momentum of an object is increased by a factor of 4 in magnitude, it means the new momentum is 4 times larger than the original momentum. Mathematically, we can write this as p' = 4p, where p' is the new momentum and p is the original momentum.

Since p = mv, we can substitute this into the equation above to obtain p' = 4mv.

Now, let's consider the kinetic energy. The original kinetic energy is KE = (1/2)mv², and the new kinetic energy is KE' = (1/2)m(v')², where v' is the new velocity.

We know that p' = 4mv, so we can rewrite it as 4mv = m(v').

Dividing both sides of the equation by m, we get 4v = v'.

Now, substituting this into the equation for kinetic energy, we have KE' = (1/2)m(4v)².

Simplifying the equation, we have KE' = (1/2)m(16v²).

Notice that v² appears in both the original and new kinetic energy equations. Since the mass (m) is the same for both cases, we can cancel it out.

Therefore, the ratio of the new kinetic energy to the original kinetic energy is (1/2)(16v²)/(1/2)(v²) = 16.

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Complete question:

The momentum of an object is increased by a factor of 4 in magnitude. By what factor is its kinetic energy changed?(a) 16 (b) 8 (c) 4 (d) 2(e) 1

ANSWER

False.

EXPLANATION

In radioactive decay (or nuclei decay), an unstable nucleus emits radiation into a nucleus that is table and has less energy and a lower mass.

Therefore, nuclei decay from a less stable form to a more stable form.

The answer is false.

Answer:

A

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Answer:

The football shoes have spikes or studs because the studs or spikes provides larger frictional force than normal shoes while running on the grass. The studs prevents player from slipping on the grass and help to run faster and change direction quickly without slipping.

Respuesta:

24m

Explicación:

Según la ecuación de movimiento

v = u + en

Dado

Velocidad final v = 12 m / s

velocidad inicial u = 0 m / s

tiempo t = 4s

Sustituir

12 = 0 + 4a

a = 12/4

a = 3 m / s²

Lo siguiente es obtener la distancia;

S = ut + 1 / 2at²

S = 0 (4) + 1/2 (3) (4) ²

S = 3 * 16/2

S = 48/2

S = 24 m

Por lo tanto, la distancia requerida es de 24 m.

Answer:

The biggest difference between the two is in how they produce light. Incandescent bulbs produce light by a heating a metallic filament until it starts to radiate light. On the other hand, fluorescent lamps produce light by exciting a gas and causing it to glow.

Explanation:

To calculate the volume of the bottle, we can use the fact that the difference in mass when the bottle is empty and full of alcohol is equal to the mass of the alcohol it contains. So:

Mass of alcohol = 47 g - 15 g = 32 g

We know that the density of alcohol is 0.8 g/cm³, so:

Density = Mass / Volume

0.8 g/cm³ = 32 g / V

Solving for V, we get:

V = 32 g / 0.8 g/cm³ = 40 cm³

Volume of water = 40 cm³

Mass of water = Density x Volume

Mass of water = 1 g/cm³ x 40 cm³ = 40 g

Volume of mercury = 40 cm³

Mass of mercury = Density x Volume

Mass of mercury = 13.6 g/cm³ x 40 cm³ = 544 g

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Mechanical, chemical, electrical, electromagnetic, thermal, acoustic, and radioactive energy are examples of different types of energy.

To avoid energetic connection with other individuals, there may be some compacting—holding back—of energy in the heart centre, and the energy field begins to divide during the early stages of death. The bottom three bodies (energy field layers) separate and disintegrate.

According to experts, energy conservation does not equate to energy savings. Energy is neither generated nor destroyed, according to the rule of conservation of energy. Energy doesn't evaporate when it is used by people. Energy may transform from one kind of energy into another.

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Forms of energy include mechanical, chemical, electrical, electromagnetic, thermal, sound, and nuclear energy.

Chemical energy is the power stored in the bonds between atoms and molecules. Things like batteries, biomass, oil, natural gas, and coal all contain chemical energy. Chemical energy is converted into thermal energy, for example, when people burn wood in a fireplace or gasoline in a car's engine.

Tension in objects is a form of mechanical energy. Rubber bands that have been stretched and compressed are two examples of mechanical energy that has been stored.

The energy that an atom's nucleus stores and uses to preserve its structural integrity is known as nuclear energy. Significant amounts of energy may be released during the joining or splitting of the nuclei.

Electrical energy is produced by tiny charged particles called electrons, which typically move along a wire. a specific instance of electrical energy in nature is lightning.

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