What’s the answer please

Answer:

-4m/s

Explanation:

use the formula

\(f = ma\)

where f-force

m-mass

a-accleration

so

1kN=1000N

so apply

4000=1000×a

a=4m/s

(the negative is because the car was braking)

Answer:

Your answer is -4 m/s^2

Explanation:

Set Up: Let +x be the direction the car is traveling.  

List the known & unknown quantities:  

   m = mass of the car = 1000 kg

  υ = 30 m/s

  Fx = –4 kN = –4000 N (negative since it is a braking force)

  ax = acceleration =?  

Solve: Use Newton’s second law of motion.  

Fx=max    

ax=Fx/m = −4000 N /1000 kg = −4000 kg·m/s^2 / 1000 kg =−4m/s^2

Answer:

= 316.67 m/s^2

Explanation:

Acceleration formula =

A = \(\frac{V_{f} - V_{i} }{t}\)

\(A = \frac{1000 - 50}{3}\)

= \(\frac{950}{3}\)

= 316.67 m/s^2

The frequency of its circular motion is\(2.67 *10^8 Hz\). This frequency represents the number of complete circles that the electron makes in one second. It is also known as the cyclotron frequency.

To calculate the speed of the electron, we need to use the equations for the motion of a charged particle in a magnetic field.

First, we can calculate the acceleration of the electron due to the potential difference. We know that the potential difference is 450 V, which is also equal to the electron's kinetic energy. Therefore, we can use the equation for kinetic energy:

\(KE =\frac{ 1}{2} mv^2\)

where KE is the kinetic energy, m is the mass of the electron, and v is its velocity. We can rearrange this equation to solve for v:

\(v = \sqrt(\frac{2KE}{m})\)

We know that KE = eV, where e is the charge of the electron and V is the potential difference, so we can substitute:

\(v = \sqrt(\frac{2eV}{m})\)

where e is the elementary charge \((-1.602 * 10^{-19 }C)\) and m is the mass of the electron\((9.109 *10^{-31} kg)\). Plugging in the values, we get:

\(v = \sqrt\frac{(2*(-1.602 *10^{-19} C)*(450 V)}{(9.109 * 10^{-31} kg)}) \\ = 6.02 x 10^6 m/s\)

This is the initial speed of the electron as it enters the magnetic field.

Next, we need to consider the motion of the electron in the magnetic field. Since the electron's velocity is perpendicular to the magnetic field, it will experience a force that is perpendicular to both its velocity and the magnetic field. This force can be calculated using the equation:

F = qvB

where F is the magnetic force, q is the charge of the electron, v is its velocity, and B is the magnetic field strength.

The magnetic force will cause the electron to move in a circular path with a radius given by the equation:

\(r =\frac{ mv }{ (qB)}\)

where r is the radius of the circular path.

Since we know the velocity of the electron and the magnetic field strength, we can calculate the radius of the circular path:

\(r = \frac{mv }{ (qB)}\)

\(=\frac{ (9.109 * 10^{-31} kg) * (6.02 * 10^{6 }m/s) }{ (1.602 *10^{-19 }C * 0.170 T) }\\\\= 1.18 * 10^{-2} m\)

Finally, we can use the speed of the electron and the radius of its circular path to calculate the frequency of its circular motion:

\(f =\frac{v}{ (2\pi r) }\\ = \frac{(6.02 * 10^{6 }m/s) }{ (2\pi * 1.18 * 10^{-2 }m)} \\= 2.67 * 10^{8 }Hz\)

This frequency represents the number of complete circles that the electron makes in one second. It is also known as the cyclotron frequency, and is a useful parameter in many applications involving charged particles in magnetic fields.

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a. the voltage across one lamp is also 6V/2 = 3V.

b)

i) When the second battery is added in series, the total voltage of the circuit doubles to 12V. Since the buzzers have the same resistance as before, the voltage across each buzzer is still half the total voltage, which is 12V/2 = 6V.

bii)

the current in the circuit increases proportionally to the increase in voltage. Specifically, the current in the circuit doubles when the second battery is added.

In a series circuit, the voltage is shared between the components in proportion to their resistance.

The circuit's overall voltage increases to 12V when the second battery is connected in series with it. The resistance of the buzzers is unchanged, so the voltage across each buzzer is still half the overall voltage (12V/2 = 6V), as before.

ii) According to Ohm's Law (I = V/R), the total resistance and total voltage in a series circuit decide the current.

The overall voltage of the circuit is increased by adding a second battery in series, but the total resistance is unaffected.

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Given data

*The given mass of the uniform disk is m = 2.01 kg

*The given radius of the disk is r = 0.100 m

*The given frequency is

The formula for the angular momentum is given as

Substitute the known values in the above expression as

To express the moment of the couple acting on the pipe assembly in Cartesian vector form, we need to first define the axis of rotation. Let's assume that the pipe assembly is rotating about the z-axis.

Now, let's suppose that the couple has a magnitude of M and acts in the xy-plane, at a perpendicular distance of d from the z-axis. The direction of the moment can be determined by the right-hand rule: if the fingers of your right hand curl in the direction of rotation, then your thumb points in the direction of the moment.

Using the right-hand rule, we can see that the moment of the couple is in the positive z-direction. Therefore, we can express the moment of the couple acting on the pipe assembly in Cartesian vector form as:

M = (0, 0, M)

Note that this vector points along the positive z-axis, since that is the axis about which the pipe assembly is rotating, and the magnitude of the vector is equal to the magnitude of the couple, M.

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A heat engine with a total heat input of 1.3 kJ and a thermal efficiency of 51 percent will produce 0.663 kJ of work.

To find out how much work a heat engine will produce with a total heat input of 1.3 kJ and a thermal efficiency of 51 percent, follow these steps:

1. Convert the thermal efficiency percentage to a decimal by dividing it by 100. In this case, 51 / 100 = 0.51.
2. Multiply the total heat input by the thermal efficiency. In this case, 1.3 kJ × 0.51 = 0.663 kJ.

So, the answer is 0.663 kJ.

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Answer:

Sophie

Explanation:

Only Sophie's results supported Newton's second law. The other students' measured accelerations were significantly lower than expected. This could indicate that their experimental designs had not sufficiently eliminated drag forces.

F=ma         Rearranging when solving for acceleration gives:  a=F/m

A 25.5 kg video cart is rolled down a hallway. It is accelerated at 0.12 m/s2. If a force of 30 N is applied to move the cart . The wheels have 26.4 N  force of friction against the floor

Force of friction is that force  that resists the sliding or rolling of one solid object over another

F(applied) - friction = F net

30 - fr = mass * acceleration

30 - fr  = 25.5  *  0.12  

fr = 30 - 3.06

  = 26.4 N

The wheels have 26.4 N  force of friction against the floor

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Answer:

658.2 nm

Explanation:

Since the galaxy is moving at relavitistic speed, we use the equation for relativistic Doppler shift of light.

So, the wavelength of light observed on the Earth is λ

λ = λ'(\(\sqrt{\frac{ 1 + \frac{v}{c} }{1 - \frac{v}{c} } }\))

where  λ' = wavelength of light emitted by galaxy = 656 nm, v = speed of galaxy = 1000 km/s (positive since the galaxy is moving away from the Earth) and c = speed of light = 300000 km/s

So, substituting the values of the variables into the equation, we have

λ = λ'(√[{1 + (v/c)}/(1 - (v/c)]

λ = 656 nm(√[{1 + (1000 km/s/300000 km/s)}/(1 - (1000 km/s/300000 km/s)]

λ = 656 nm(√[{1 + 1/300}/(1 - 1/300]

λ = 656 nm(√[{(300 + 1)/300}/{(300 - 1)/300}]

λ = 656 nm(√[{(301)/300}/{(299)/300}]

λ = 656 nm(√[301/299])

λ = 656 nm(√1.0067)

λ = 656 nm × 1.0033

λ = 658.19 nm

λ ≅ 658.2 nm

So, the wavelength observed on Earth is 658.2 nm

Answer:

Answer is negative -2 think about this is basically a sbrtaction problem the number starts at 12 and then it moves 14 to left which means backwards so 12-14=-2 so thats were u get -2 as your answer.

Explanation:

wanted to help people plus I am doing the quiz right now.

The potential energy is highest on a marble roller coaster at the highest point of the track.

The potential energy of an object is directly related to its height and its position relative to the reference point. In the case of a marble roller coaster, as the marble climbs up the track, it gains potential energy due to its increased height.

At the highest point of the roller coaster track, the marble reaches its maximum elevation, and thus, its potential energy is at its highest point.

As the marble moves downhill from the highest point, its potential energy decreases and is converted into kinetic energy, which is the energy of motion.

At the bottom of the track, where the marble reaches its lowest point, the potential energy is at its minimum because the height is at its lowest and the marble has converted most of its potential energy into kinetic energy.

The potential energy is highest on a marble roller coaster at the highest point of the track. This is where the marble reaches its maximum elevation and has the greatest amount of potential energy due to its height. As the marble moves downhill, its potential energy decreases and is converted into kinetic energy.

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Toner blows in the air when you use a vacuum cleaner, which could be dangerous for you. Paper, toner, and dust fragments may collect inside the printer during printing.

The picture is kept in place at the same time by the push and reaction forces provided by the wall. The painting's position or state with respect to time do not change as a result of these forces. As a result, it makes for an excellent illustration of static force.

Voltage, commonly referred to as electromotive force, is the quantity of energy contained in a charge. Voltage, then, is the variation in electric potential between two places. Simply put, current is the pace at which electric charge flows.

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The current in the milliamperes produced by the solar cells of a pocket is 0.278mA

Magnitude of charge passing through the solar cells, C=4.00C

Time period,  t=4.00h

The current is expressed as the rate at which the electric charge is passing through an electrical appliance. So, the current produced by the solar cells is expressed by the following equation:

I =C/t

Substituting values in the above equation we get

I =0.278mA

The current is defined in physics as the amount of charge that passes through an electrical appliance in a certain amount of time. The magnitude of the current is usually measured in amperes. We can convert the current from amperes to milliamperes by utilizing the appropriate conversion factors.

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Answer:

No. 1 is the correct answer.

Explanation:

The natural resources which deplets after long and continious use and are unable to be recreated/ takes a lot of time to renew are non renewable resources

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 10 × 16

We have the final answer as

Hope this helps you

Answer:

Both particle and wave properties

Explanation:

Light is defined as a particle and a wave, and even as a combination of a particle and a wave. A unit of light is the photon. Higher energy photons behave like particles and low energy photons behave like waves.

Experiments performed with light indicate that light exhibits both particle and wave properties.

Answer:

10 V

Explanation:

RMS Voltage (Root Mean Square Voltage) of a Waveform is the amount of AC power that produces the same heating effect equal to that of a DC.

The peak voltage is the highest value the voltage of any waveform can attain (that is it is the maximum voltage attained).

The RMS voltage is given as:

\(V_{rms}=\frac{V_p}{\sqrt{2} } \\\\Given\ V_p=14.14\ V,hence:\\\\V_{rms}=\frac{14.14}{\sqrt{2} } \\\\V_{rms}=10\ V\)

The angular momentum of the mother around the center of the merry-go-round is 14,165 kg m/s.  

The angular momentum of an object is given by the equation:

L = mrω

ω = L / mr

Since the mass of the mother is m and the radius of the circular path is r, we can substitute these values into the equation to find her angular velocity:

ω = L / mr

Since the mother's speed is v and the radius of the circular path is r, we can substitute these values into the equation to find her linear velocity:

v = ωr

Substituting the values for v (3.7 m/s) and r (1.5 m), we can solve for ω:

ω = v / r

ω = 3.7 m/s / 1.5 m

ω = 2.42 rad/s

Therefore, the angular velocity of the mother is 2.42 rad/s.

We can also rearrange the equation to solve for L:

L = mr\(w^2\)

Since the mass of the mother is m and the radius of the circular path is r, we can substitute these values into the equation to find her angular momentum:

ω = v / r

ω = 3.7 m/s / 1.5 m

ω = 2.42 rad/s

Therefore, the angular momentum of the mother is L = mrω = (70 kg) x (1.5 m) x (2.42 rad/s) = 14,165 kg m^2/s.

Therefore, the angular momentum of the mother around the center of the merry-go-round is 14,165 kg m/s.  

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Explanation:

Answer: B

Explanation:

Got it right on edge

Option (b) is correct, the second transition from the n=2 level to the n=1 level results in the emission of the longest-wavelength photon.

In hydrogen atom transitions, the energy of a photon emitted during a transition is given by the equation ΔE = E_final - E_initial = hc/λ, where ΔE is the energy difference between the initial and final levels, h is Planck's constant, c is the speed of light, and λ is the wavelength of the emitted photon.

When a hydrogen atom transitions from the n=3 level to the n=2 level, it undergoes an energy decrease, resulting in the emission of a photon. This transition corresponds to the Balmer series in the hydrogen spectrum. However, the transition from the n=2 level to the n=1 level is associated with the Lyman series, which involves higher energy differences.

Since the energy differences increase as we move from higher energy levels to lower energy levels, the transition from the n=2 level to the n=1 level has a larger energy difference compared to the transition from the n=3 level to the n=2 level. Consequently, the second transition emits a photon with a longer wavelength than the first transition.

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Answer:

The brain is controlling the movement and it’s called the nervous system

Explanation:

I took the test

The work done on the Puck by the applied force from the most positive to the most negative is c, b, a respectively.

According to Newton's second law of motion, the force applied to an object is directly proportional to the product of mass and acceleration of the object.

F = ma

\(F= \frac{mv}{t}\)

The force applied to an object increases with increases in the velocity of the object.

In the given diagram, the resultant velocity of the puck is calculated as follows;

Figure a:

\(\Delta v = v_f -v_i\\\\\Delta v = 5 - 6 = - 1 \ m/s\)

Figure b:

\(v = \sqrt{4^2 + 3^2} \\\\v = 5 \ m/s\)

Figure c:

\(\Delta v = 4 - (-2)\\\\\Delta v = 6 \ m/s\)

Thus, the work done on the Puck by the applied force from the most positive to the most negative is c, b, a respectively.

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Answer: its low

Explanation:

The emotion that occurs more often to more drivers is frustration.

What is frustration? Frustration is a feeling of dissatisfaction, displeasure, and discontent that arises as a result of an inability to fulfill a need or a goal. In driving, frustration is a common emotional state that occurs when a person is prevented from driving at their preferred pace, or when a person experiences unexpected events while driving, such as traffic jams or sudden accidents. Frustration may be caused by a variety of factors, including:

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Answer:

Option D. 9.47 V

Explanation:

We'll begin by calculating the equivalent resistance of the circuit. This can be obtained as follow:

Resistor 1 (R₁) = 20 Ω

Resistor 2 (R₂) = 30 Ω

Resistor 3 (R₃) = 45 Ω

Equivalent Resistance (R) =?

R = R₁ + R₂ + R₃ (series connections)

R = 20 + 30 + 45

R = 95 Ω

Next, we shall determine the current in the circuit. This can be obtained as follow:

Voltage (V) = 45 V

Equivalent Resistance (R) = 95 Ω

Current (I) =?

V = IR

45 = I × 95

Divide both side by 95

I = 45 / 95

I = 0.4737 A

Finally, we shall determine, the voltage across R₁. This can be obtained as follow:

NOTE: Since the resistors are in series connection, the same current will pass through them.

Current (I) = 0.4737 A

Resistor 1 (R₁) = 20 Ω

Voltage 1 (V₁) =?

V₁ = IR₁

V₁ = 0.4737 × 20

V₁ = 9.47 V

Therefore, the voltage across R₁ is 9.47 V.

Answer:

9.47

Explanation:

Just Took the Test

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 300 × 10

We have the final answer as

Hope this helps you