A drive is driving a car at 36 km per hour. When he applies brake they cause a deceleration of 3 ms-2. If he takes 1s to apply the brakes ______is the distance travelled by the car during this period
A)16.67m
B)16m
C)21.75m
D)15

Answer:

Formula = D = m/v

Given value of D = 19.3 and m = 13g

19.3 = 13/v

V × 19.3 = 13

v = 13/19.3

v = 0.67

Answer: lot

Explanation: because you just climbed a mountain

Answer:

1. Formula = distance/time

D= 112.0 meters, time =4 secs

Speed = d/t =112.0/4

= 28m/s

2.Formula = distance/time

D= 1/4 x 16093.44 m

= 402.35m

Time = 15secs

Speed= d/t

= 402.35/15

=26m/s

The wavelength emitted in the transition from level U to level L is 1615 A°, a four-level laser system.

The energy level between the energy levels U 0.820 eV to level L 0.051 eV,

E = E₂ - E₁

  = 0.820 - 0.051

 = 0.769 eV

The difference between energy levels, E is 0.769 eV.

The energy,

E = hc / λ

Energy (E) = 0.769 eV

h (Planck's constant) = 6.626 ×10⁻³⁴

c (speed of the light) = 3×10⁸ m/s

λ (wavelength) =?

λ = hc / E

 = (6.626 ×10⁻³⁴ × 3×10⁸ m/s) / 0.769 eV

 = (6.626 ×10⁻³⁴ × 3×10⁸ m/s) / (0.769×1.6×10⁻¹⁹)

 = (1.9878×10⁻²⁵) / (1.2304×10⁻¹⁹)

 = 1.6155×10⁻⁶

= 1615 ×10⁻¹⁰

= 1615 A°

The wavelength of radiation emitted in the transition from level U to

level L, 1615 A°.

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Answer:

1.5g/cm³

Explanation:

Given parameters:

Initial volume of the liquid  = 30cm³

Final volume of the liquid  = 50cm³

Mass of the liquid  = 30g

Unknown:

Density of the liquid  = ?

Solution:

Density is the mass per unit volume of a substance.

  Density  = \(\frac{mass}{volume}\)  

volume of the liquid  = final volume - initial volume  =  50cm³  -  30cm³

 volume of the liquid  = 20cm³

Density  = \(\frac{30}{20}\)   = 1.5g/cm³

Question :-

Answer :-

Explanation :-

As per the provided information in the given question, we have been given that the Speed of scooter is 15 m/s . And, we have been asked to calculate the Distance , covered by the scooter in 45 seconds .

For calculating the Distance , we will use the Formula :-

\( \bigstar \: \: \boxed{ \sf{ \: Distance \: = \: Speed \: \times \: Time \: }} \)

Therefore , by Substituting the given values in the above Formula :-

\( \dag \: \: \: \sf { Distance \: = \: Speed \: \times \: Time \: } \)

\( \longmapsto \: \: \: \sf { Distance \: = \: 15 \: \times \: 45 \: } \)

\( \longmapsto \: \: \textbf {\textsf { Distance \: = \: 675 meter}} \)

\( \underline {\rule {180pt} {4pt}} \)

Answer:

The second type of body wave is the S wave or secondary wave, which is the second wave you feel in an earthquake. An S wave is slower than a P wave and can only move through solid rock, not through any liquid medium.

Answer:

The new Coulomb force is q₁q₂/9πε₀r²

Explanation

The coulomb force between the two charges q₁ and q₂ at a distance r in air is given by F = q₁q₂/4πε₀r².

Now, let us assume the material of dielectric constant κ = 9 is placed between them on the side of the q₁ charge. The value of its effective charge is now q₃ = q₁/κ at a distance of d = r/2 from the q₂ charge.

Since we have air between q₂ and q₃, the coulomb force between them is

F' = q₂q₃/4πε₀d²

= q₂(q₁/κ)/4πε₀(r/2)²

=  4q₂q₁/κ4πε₀r²

= 4/κ(q₂q₁/4πε₀r²)

= 4/9 × (q₂q₁/4πε₀r²)

= q₁q₂/9πε₀r²

So, the new Coulomb force is q₁q₂/9πε₀r²

The magnitude of the magnetic force on the wire due to the Earth's magnetic field at this point is estimated to be 8.4 x \(10^{-3}\) N if A 1.5-m length of wire carrying 4.5 A of current is oriented horizontally

The magnitude of the magnetic force on the wire due to the Earth's magnetic field of 5.5x105 T at this point can be estimated using the formula F = BILsinθ, where F is the magnetic force, B is the magnetic field strength, I is the current in the wire, L is the length of the wire, and θ is the angle between the wire and the magnetic field vector.  

This formula is known as the Lorentz force equation.In this case, the magnetic field strength B is given as 5.5x105 T, the current I is 4.5 A, the length L is 1.5 m, and the angle θ is 38°. Hence, substituting the values into the formula we have:F = BILsinθF = (5.5x105 T) x (4.5 A) x (1.5 m) x sin(38°)F = 8.4 x 10^-3 N

This force is directed perpendicular to both the current direction and the magnetic field vector direction, according to the right-hand rule for the direction of the magnetic force. The magnitude of the magnetic force on the wire depends on the current in the wire, the length of the wire, the strength of the magnetic field, and the angle between the wire and the magnetic field vector.

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Answer:

17.56N

Explanation:

Wx=mgsin(21)=5*9.8*sin21=17.56N

Answer:

Hope I Helped

Explanation:

gravitational attraction on the Moon is much less than it is here on Earth, and a person weighs less on the Moon. This weaker gravity is why we have the famous images of the Apollo astronauts taking “one giant leap for mankind” on the Moon's surface.

The work accomplished is positive if you are pushing the wheelbarrow in the direction of its motion.

Work is the application of a force over a distance to transfer energy from one system to another.

The International System of Units' Joule (J) is commonly used as the unit of work (SI).

When an object is being moved and a force is being applied, work is being done. Given that you are pushing the wheelbarrow, the force you are exerting is in a direction that corresponds to the displacement (increase in speed) of the wheelbarrow, so the effort you have done is beneficial.

Work is created by multiplying force by displacement as a scalar. Work is accomplished when the directions of force and displacement are identical. Negative work is done when the forces of force and displacement are in conflict. As a result, work accomplished is positive if you are pushing the wheelbarrow in the direction of its motion, and negative if you are not.

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The coefficient of friction is the ratio of frictional force to the normal force. The normal force acting on 15 Kg object is 147 N and the coefficient of friction is 0.149.

Friction is a kind of resistive force acting on a body that resist it from motion. Thus, frictional force will be always opposite to the applied force for the displacement of an object.

The normal force acting on a body of mass m is mg. Where, g is the acceleration due to gravity. Normal force acting on 15 kg object is :

N = mg

   = 15 × 9.8 m/s²

   = 147 N.

The coefficient of friction = Normal force / frictional force

                                          = 22 N/147 N

                                          = 0.149

Therefore, the coefficient of friction for an object with 15 kg and 22 N frictional force is 0.149.

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The marking on the scale is 4.79 cm

A crucial numeracy skill is the ability to read scales. Additionally, it supports theories about the density of the number line. Students require a firm grasp of decimal notation in order to make readings between labeled points on a scale. If it's a scale, such as a bathroom scale, it effectively tells you how much pressure is exerted on it. A weight or mass might be the reading since they are proportionate. However, since your weight would be lower there, if you used that scale on the surface of the moon, it would read lower. Scale factor = Dimension of the new shape Dimension of the original shape is the fundamental formula used to calculate it.

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The increase in length of the copper with original length of 120 m is  8.16×10⁻² m.

A change in length ΔL is produced when a force is applied to a wire or rod parallel to its length L0, either stretching it (a tension) or compressing it.

To calculate the increase in length of the copper, we use the formula below

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

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From the calculation, the mass of the dummies head is 1647.44 Kg

We know that the momentum after collision is equal to the momentum before collision.

Mass of the headrest = 2005.6 kg

Initial velocity of the head rest = 4.524 m/s

Final velocity of the head rest =  4.487 m/s

Mass of the dummy = m

Initial velocity of the dummy = -1.005 m/s

Final velocity of the dummy = 9.965 m/s

Then;

(m *  -1.005) + (2005.6 * 4.524 ) = (2005.6 *   4.487) + (m * 9.965)

-1.005m + 9073.33 = 8999.13 + 9.965m

9073.33 - 8999.13  = 9.965m + 1.005m

18072.46 = 10.97m

m = 18072.46/ 10.97

m = 1647.44 Kg

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The forces acting on the baseball are air resistance, and force of gravity.

The forces which act on an object moving upward will either oppose the motion of the object or help to speed up the object.

The forces present during upward motion include;

The forces acting on a baseball thrown upwards which also travels rightward include the following;

Thus, the forces acting on the baseball are air resistance, and force of gravity.

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The complete question is below:

Consider this situation: A baseball travels upward and

rightward through the air. Of the forces listed, identify which

act upon the baseball. (force of air resistance, force of gravity, weight of the ball, frictional force).

The wavelength of q101 is equal to 2.946 meters.  

The wavelength of a radio wave is determined by the frequency, and for q101 the frequency is 101.7 MHz.

The formula for calculating wavelength is: wavelength = speed of light (3 x 10^8 m/s) divided by the frequency (101.7 MHz).

The wavelength of a radio wave is the distance from the crest of one wave to the crest of the next, and the frequency is the number of waves passing a point in a second.

As the frequency increases, the wavelength decreases, and vice versa.

Since q101 is operating at 101.7 MHz, its wavelength is much shorter than a station operating at a lower frequency, such as the FM station 88.3 MHz, which has a wavelength of 3.41 meters.

The wavelength is also important in antenna design. An antenna needs to be designed according to the specific wavelength of the station in order to pick up the signal. In the case of q101, a 2.946 meter antenna is needed.

q101 is a local radio station operating at 101.7 MHz, and its wavelength is 2.946 meters. The wavelength is determined by the frequency, and is also important in antenna design.

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The kinetic energy of the moving express train with the given value of mass and velocity is 7.5 × 10⁵Joules.

Kinetic energy is simply a form of energy a particle or object possesses due to its motion.

It is expressed as;

K = (1/2)mv²

Where m is mass of the object and v is its velocity.

Given the data in the question;

To determine the kinetic energy of the train, we substitute our given values into the above expression.

K = (1/2)mv²

K = (1/2) × 600kg × (50m/s)²

K = 0.5 × 600kg × 2500m²/s²

K = 750000kgm²/s²

K = 7.5 × 10⁵J

Therefore, the kinetic energy of the moving express train with the given value of mass and velocity is 7.5 × 10⁵Joules.

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Therefore, the image is formed at a distance of -70 cm from the lens and it is an inverted image with a height of 2.0 cm.

Given data:

Object height (h) = 2.0 cm, Object distance (u) = -70 cm, Focal length (f) = 35 cm

Lens formula is given as follows:

`1/f = 1/u + 1/v`

where, f = focal length of the lens, u = object distance from the lens, v = image distance from the lens

By using the lens formula,

the image distance (v) can be calculated as

:1/f = 1/u + 1/v1/35 = 1/-70 + 1/v1/v = 1/-70 - 1/35 = -3/210 = -1/70v = -70 cm

The negative sign indicates that the image is formed on the same side of the lens as the object.

Therefore, it is an inverted image.

The image height can be calculated using the magnification formula which is given as follows:

`m = -v/u`

where, m = magnification

v = image distance from the lens, u = object distance from the lens

Substituting the values, we get:

`m = -v/u`

`m = -(-70)/(-70)

`m = 1

The positive value of magnification indicates that the image is an upright image.

The height of the image can be calculated as:

`m = -v/u``1 = -v/(-70)`v = -70 cm

`h_i = m × h_o`

`h_i = 1 × 2.0 = 2.0 cm

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When the temperature is low,\(P \alpha T^{5/2}\) as the particles are in their ground state and have no kinetic energy.  P0 can be regarded as zero because the number of particles in the ground state (N0) is very small.

a.) Given the ideal gas law equation is: PV = NkT where (N) Neff is the effective number of particles. At low temperatures, the particles occupy mostly the ground state, and the number of particles in higher energy states is negligible. Hence, their energy is entirely due to quantum mechanical effects, which means that the pressure is proportional to the number of particles, Neff. Thus the pressure of an ideal Bose gas is proportional to the fifth power of the temperature at low temperatures, \(P \alpha T^(5/2).\)

b.) Given the ground state contribution to the pressure is:

\(P0 = kT/V ln(N0 + 1)\) where N0 is the number of particles in the ground state. Here pressure is proportional to the number of particles and temperature. As number of particles is small and constant P0 can be regarded as zero.

Also at temperatures below the critical temperature (Tc), the Bose gas enters a condensate phase, where a large fraction of the particles occupy the ground state. In this state, the pressure of the Bose gas is independent of the volume because the number of particles in the ground state is unaffected by the volume. Thus, the pressure of the Bose gas is determined solely by the temperature and number of particles in the system, and is independent of the volume.

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Answer:

30 m\ s Ans .....

Explanation:

Data:

f = 10 Hz

w = 3 m

v = ?

Formula:

v = fw

Solution:

v = ( 10)(3)

v = 30 m\ s Ans ........

Answer:

She will travel 180 kilometers.

Explanation:

You take the time and multiply it by your distance, and you get your total distance.

d = v.t

d = 60 km/h x 3 h

d = 180 km

Answer:

3.125×10²¹ N/C

Explanation:

Electric Field: This can be defined as the force experienced per unit charge. The S.I unit of electric Field is N/C

Applying,

E = F/q.................. Equation 1

Where E = Electric Field, F = Force experienced, q = Charge of an electron.

From the question,

Given: F = 500 N, q = 1.6×10⁻¹⁹ C

Substitute these values into equation 1

E = 500/(1.6×10⁻¹⁹)

E = 312.5×10¹⁹

E = 3.125×10²¹ N/C

ANSWER:

16 N

STEP-BY-STEP EXPLANATION:

The force is given by the multiplication of the mass and the acceleration, like this:

We repalce and calculate the force, like this:

The force is 16 newtons

Answer:

Avery

Explanation:

15 Kilometers is faster than 10 Kilometers

people who express being madly in love are likely to report feeling intense emotions such as euphoria, happiness, excitement, and a strong desire for closeness. However, it's essential to recognize that the experience of love is complex and involves multiple neurochemical processes.

Because of the release of the neurotransmitter dopamine, people who express that they are madly in love are likely to report feeling a range of intense emotions. Dopamine is associated with feelings of pleasure, reward, and motivation, and its release in the brain can contribute to the euphoric sensations commonly experienced in the early stages of romantic love.

Individuals who are madly in love often describe feeling a sense of exhilaration, happiness, and an overall heightened state of well-being. They may experience increased energy levels, a sense of excitement and anticipation, and a general feeling of being "on top of the world." Additionally, the release of dopamine can enhance feelings of attraction and attachment, leading to an intense desire to be close to the person they love.

However, it is important to note that while dopamine plays a significant role in the initial stages of romantic love, long-term love and attachment involve other neurotransmitters and hormones, such as oxytocin and vasopressin. These chemicals contribute to feelings of trust, bonding, and long-term commitment.

In conclusion, people who express being madly in love are likely to report feeling intense emotions such as euphoria, happiness, excitement, and a strong desire for closeness. However, it's essential to recognize that the experience of love is complex and involves multiple neurochemical processes.

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Answer: A negatively-charged ion always has more electrons than protons

Explanation:

First, we know that the elementary negative charge is the electron, while the positive one is the proton. Such that both have the same charge in magnitude, but a different sign. Such that if we have the same number of electrons and protons in an atom, the charge of this atom will be neutral.

And an ion is an atom with a different number of electrons and protons, so the charge of the atom is not neutral.

Then if we have a negatively-charged ion, the charge of this atom is negative. Then we must have a larger number of electrons (the negative ones) than protons (the positive ones)

Then the correct option is:

A negatively-charged ion always has more electrons than protons

The conduction of current on the postsynaptic neuron in an electrical synapse occurs through direct flow of ions between the presynaptic and postsynaptic neurons.

In electrical synapses, the conduction of current on the postsynaptic neuron occurs through direct flow of ions between the presynaptic and postsynaptic neurons. These synapses are formed by specialized structures called gap junctions, which create channels between the cells, allowing ions to pass through. The channels are formed by connexin proteins that span the plasma membranes of adjacent neurons.

When an action potential reaches the presynaptic neuron, it depolarizes the cell membrane and triggers the opening of voltage-gated ion channels. This results in the influx of positively charged ions, such as sodium (Na+), into the presynaptic neuron. As a result, the electrical potential of the presynaptic neuron becomes more positive.

Due to the direct connection provided by the gap junctions, these positive ions can flow through the channels into the postsynaptic neuron. This movement of ions generates an electrical current that spreads across the postsynaptic neuron. The current causes depolarization of the postsynaptic membrane, leading to the initiation of an action potential in the postsynaptic neuron.

The strength of the electrical synapse is determined by the size of the gap junctions and the number of connexin proteins present. The larger the gap junctions and the more connexin proteins, the more ions can pass through, resulting in a stronger electrical coupling between the neurons.

at electrical synapses, the conduction of current on the postsynaptic neuron occurs through the direct flow of ions between the presynaptic and postsynaptic neurons via specialized gap junctions. This direct electrical coupling allows for rapid and synchronized transmission of signals. Electrical synapses are particularly important in neural circuits that require fast and coordinated communication, such as in reflex arcs or the synchronization of cardiac muscle cells.

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The calculated tension is 500 N. The direction of pulling is pull and is named tension. Therefore, tension points away from the mass in the direction of the cord/rope.

In hanging weights, the string/rope exerts an upward force on the weight as the string pulls the weight upwards. This is the force generated when a load is applied to the edge of an object, usually its cross section. Also called tensile force, tension, or tension. This type of force is only applied when the cable and object are in contact. Tension also allows power to be transmitted over relatively long distances.

mg= 50 *10

=500 N

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