the linear impulse delivered by the hit of a boxer is 272 n · s during the 0.148 s of contact. what is the magnitude of the average force exerted on the glove by the other boxer? answer in units of n.

Answer:

6.25 m/s

Explanation:

Given parameters

Initial mark = 65

Final mark  = 15

time taken = 8s

Unknown:

Velocity of the runner  = ?

Solution:

Velocity is the displacement divided by time;

        Velocity  = \(\frac{displacement}{time}\)  

Displacement  = Initial mark - final mark  = 65 - 15 = 50m

Now, insert the parameters and solve;

       Velocity  = \(\frac{50}{8}\)   = 6.25m/s

Answer:

Option (c) - Kg, m, s

Explanation:

The internationally agreed system of units for physical quantities is based on the fact that kg(kilogram) is the unit of mass, m(meter) is the unit of length and (second) is the unit of Time.

They are the foundation of classical mechanics.

A hypothesis is a speculative explanation that may be tested by more research. A theory is a well-supported explanation for observed phenomena. A scientific law is a summary of the relationship between variables. A regulated way of evaluating a hypothesis is an experiment. A significant feature shared by a scientific hypothesis, theory, and rule is that they are all founded on observations. A scientific observer notices a phenomena and attempts to explain what they saw.

The terms “IF” and “THEN.” Are frequently used in hypothesis writing. “If I do not study, then I will fail the test.” For example. Your independent and dependent variables are reflected in the “if” and “then” statements. Your theory should be related to your

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empty space or vaccum the Electro magnetic wave travels the fastest.

Answer:

1400g/L

Explanation:

Change 25ml into litres.

Use the formula d=m/v

Devide 35g by 0.025L

A convex lens forms an image by refracting light rays that pass through it. When parallel rays of light pass through a convex lens, they converge or come together at a point called the focal point.

1. The distance between the lens and the focal point is called the focal length. The image formed by a convex lens can be either real or virtual, depending on where the object is placed in relation to the focal point.
2. A concave lens, on the other hand, forms an image by diverging or spreading out light rays that pass through it. When parallel rays of light pass through a concave lens, they diverge or spread apart. The image formed by a concave lens is always virtual and smaller than the object.
3. A concave mirror forms an image by reflecting light rays that strike it. When parallel rays of light strike a concave mirror, they converge at a point called the focal point. The distance between the mirror and the focal point is called the focal length. The image formed by a concave mirror can be either real or virtual, depending on where the object is placed in relation to the focal point.
4. A convex mirror forms an image by reflecting light rays that strike it. When parallel rays of light strike a convex mirror, they diverge or spread apart. The image formed by a convex mirror is always virtual and smaller than the object.
5. A concave mirror and a convex lens are similar in that they both converge light rays. However, a concave mirror forms images through reflection, while a convex lens forms images through refraction. Additionally, a concave mirror can form both real and virtual images, while a convex lens can only form real images.

A convex lens converges light beams that are travelling parallel to its principal axis (the incident rays are pointed in the direction of the principal axis). A convex lens is also referred to as a converging lens because all of the light rays it bends eventually come together to form a picture at a single location. When an object is positioned in front of the focal point of a converging lens, a virtual image is created.

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The movement of the area with the most cloud cover throughout the year is generally from the southern hemisphere to the northern hemisphere and back again.

The area with the most cloud cover varies throughout the year due to changes in the amount of incoming solar radiation. The Intertropical Convergence Zone (ITCZ) is a region near the equator where the trade winds from the northern and southern hemispheres converge. This convergence causes warm, moist air to rise, leading to the formation of clouds and thunderstorms. During the northern hemisphere summer, the ITCZ moves northward, following the path of the sun. This leads to increased cloud cover over the tropics and subtropics of the northern hemisphere, including areas such as Southeast Asia, India, and parts of Africa. As the northern hemisphere moves into winter, the ITCZ begins to move southward, bringing the area of most cloud cover back to the southern hemisphere. However, the movement of the ITCZ is not a simple north-south migration. Its position can be affected by factors such as the El Niño Southern Oscillation (ENSO) and the Madden-Julian Oscillation (MJO), which can cause shifts in the location and intensity of the ITCZ. In addition, other weather patterns such as monsoons and tropical cyclones can also influence cloud cover in specific regions. Overall, the movement of the area with the most cloud cover throughout the year is complex and influenced by a variety of factors, but it generally follows the path of the sun from the southern hemisphere to the northern hemisphere and back again.

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Answer:

40kg

Explanation:

that the answer

The height of the bleachers when a tennis ball dropped from the top and takes 3 seconds in flight is 45 m.

Height can be defined as the vertical distance between two points.

To calculate the height of the bleachers, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the height of the bleachers is 45 m.

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Answer:

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Answer:

It represents Distance.

Explanation:

Answer: nuclear energy, fossil energy -- like oil, coal and natural gas -- and renewable sources like wind, solar, geothermal and hydro power

Explanation:

Energy can be in many forms like the ones I stated but the sun is probably the biggest source also and play's a big part.

Answer:

See below

Explanation:

a  PE only...the ball is not moving

b and c     PE  and KE

d  KE only  

e and f      PE and KE

The energy of the ball at its highest position is potential energy.

The law of conservation of energy states that, energy can neither be created nor destroyed. Despite this, it is capable of changing its form. The sum of the energies in an isolated system is constant regardless of the types of energy present.

Here,

According to law of conservation of energy, at each position of the ball, it will have some amount of energy.

At point A

The ball is at its highest position, that means maximum height. So, the energy of the ball at that position is potential energy and it doesn't have any kinetic energy.

At points B and C

At these positions the ball is moving downwards. That means the potential energy is being converted into kinetic energy of the ball. So, it has both PE and KE.

At point D

The ball is at the lowest position, on the ground. So, the potential energy is zero. Therefore, it has the kinetic energy.

At points E and F

At these positions, the ball is moving upwards. So, it has both PE and KE.

Hence,

The energy of the ball at its highest position is potential energy.

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The energy stored in the solenoid is 0.01299 J.

To calculate the energy stored in a solenoid, we can use the formula:

E = (1/2) * L * I^2

where E is the energy stored, L is the inductance of the solenoid, and I is the current passing through the solenoid.

First, let's find the inductance of the solenoid using the formula:

L = (μ₀ * N² * A) / l

where μ₀ is the permeability of free space, N is the number of turns, A is the cross-sectional area of the solenoid, and l is the length of the solenoid.

Given:
Diameter = 2.50 cm
Radius (r) = Diameter / 2 = 2.50 cm / 2 = 1.25 cm = 0.0125 m
Length (l) = 12.0 cm = 0.12 m
Number of turns (N) = 170
Current (I) = 0.750 A

First, we need to calculate the cross-sectional area (A) of the solenoid using the formula:

A = π * r²

Substituting the value of r, we get:

A = π * (0.0125 m)²

Now we can calculate the inductance (L):

L = (μ₀ * N² * A) / l

Substituting the values, we get:

L = (4π × 10^-7 T·m/A * (170)² * π * (0.0125 m)²) / 0.12 m

Simplifying the equation, we get:

L = (4π × 10^-7 T·m/A * 28900 * π * 0.00015625 m²) / 0.12 m

L = (1.16 × 10^-4 * 28900 * 0.00015625) / 0.12

L = 0.04636 H

Now, we can calculate the energy stored (E):

E = (1/2) * L * I²

Substituting the values, we get:

E = (1/2) * 0.04636 H * (0.750 A)²

Simplifying the equation, we get:

E = (0.5 * 0.04636 H * 0.5625 A²)

E = 0.01299 J

Therefore, the energy stored in the solenoid is 0.01299 J.

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Answer:

Kinetic Energy = 1/2mv^2

Kinetic Energy = 1/2(150 kg)(20 m/s)^2

Kinetic Energy = 75 kg(400 m/s)

Kinetic Energy = 30000 J

Let me know if this helps!

The slope of song 2's graph between minute 6 and 7 is positive.

The slope of a graph represents the rate of change between two points on the graph. In this case, we are looking at the slope of the graph of song 2 between minute 6 and minute 7.

Based on the shape of the graph, we can see that the line is trending upwards from minute 6 to minute 7.

Therefore, the slope is positive. This means that as time increases by one minute, the value on the y-axis (likely representing the volume or intensity of the song) is also increasing.

In other words, the song is getting louder or more intense over the course of this minute.

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The magnitude of the linear velocity is increasing in time based on the given position equation x(t) = 4t² - 2t + 3. The correct answer is a

The linear velocity of a particle is the rate at which it changes its position with respect to time. To determine whether the magnitude of the linear velocity is increasing, constant, decreasing, or undefined, we need to analyze the given position equation.

The position equation is given by x(t) = 4t² - 2t + 3.

To find the linear velocity, we take the derivative of the position equation with respect to time.

v(t) = d/dt (x(t)) = d/dt (4t² - 2t + 3)

Simplifying the derivative, we get v(t) = 8t - 2.

Now, let's analyze the expression for linear velocity:

(a) The magnitude of the linear velocity is increasing in time:

For this to be true, the derivative v(t) must be positive and increasing. In our case, v(t) = 8t - 2, which is a linear function. Since the coefficient of t (8) is positive, the linear velocity is increasing as time progresses. Therefore, the answer is (a) the magnitude of the linear velocity is increasing in time.

To summarize, the magnitude of the linear velocity is increasing in time based on the given position equation x(t) = 4t² - 2t + 3.

The explanation provided is accurate and provides the steps to determine the change in linear velocity over time based on the given position equation. The conclusion is supported by the analysis of the derivative of the position equation, showing that the magnitude of the linear velocity is indeed increasing in time. This explanation provides a clear understanding of the concept and answers the question with proper conclusion.

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a) The fundamental frequency is 382.2 Hz.

b) The frequency of the first overtone is f2 = 3f1.

c) The frequency of the second overtone is f3 = 5f1.

d) The frequency of the third overtone is 2675.4 Hz.

e) The highest harmonic that may be heard is the 52nd overtone.

The fundamental frequency of a pipe open at both ends is given by:

f1 = v / (2L)

where v is the speed of sound and L is the length of the pipe. Substituting the given values, we get:

f1 = 344 m/s / (2 × 0.45 m) = 382.2 Hz

a) The fundamental frequency is 382.2 Hz.

The frequency of the first overtone is given by:

f2 = 3f1

b) Substituting the value of f1, we get:

f2 = 3 × 382.2 Hz = 1146.6 Hz

The frequency of the second overtone is given by:

f3 = 5f1

c) Substituting the value of f1, we get:

f3 = 5 × 382.2 Hz = 1911 Hz

The frequency of the third overtone is given by:

f4 = 7f1

d) Substituting the value of f1, we get:

f4 = 7 × 382.2 Hz = 2675.4 Hz

The highest harmonic that may be heard by a person who can hear frequencies from 20 Hz to 20000 Hz is given by:

n = (fmax / f1)

where fmax is the maximum frequency that can be heard (i.e., 20000 Hz).

e) Substituting the values, we get:

n = 20000 Hz / 382.2 Hz = 52.3

Therefore, the highest harmonic that may be heard is the 52nd overtone. However, it is important to note that in practice, the higher harmonics may not be audible or may be perceived as a combination of lower frequency sounds due to the limited sensitivity of the human ear.

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Answer:

c

Explanation:

The time a baseball that is thrown horizontally with a velocity of 15 m/s off a cliff that is 100 meters tall will be in the air is 4.54 seconds.

Velocity can be defined as the rate of change of the object's position with respect to a frame of reference and time.

If a baseball is thrown off a cliff that is 100 meters tall. The ball is thrown horizontally (forwards) with a velocity of 15 m/s. The baseball will be 4.54 seconds in the air.

From the equation, the given parameters are

height of cliff =  100 m

velocity = 15m/s

time = ?

g = acceleration due to gravity = 9.81 m/s²

we have that

S = u + 1/2gt²

100 = 5 + 1/2 * 9.8 * t²

100 - 5 = 4.9 * t²

95 /4.9 = t²

t = √20.65

t = 4.54 seconds.

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Answer:

Gravity does no work on the Moon

Explanation:

Fatima is skating at a speed of 5 m/s. if she accelerates uniformly to a new speed of 15 m/s and it takes 13 seconds, the distance that she travels is 130 meters.

When an object accelerates uniformly, its average velocity can be calculated by taking the average of the initial and final velocities. In this case, the average velocity is (5 + 15) / 2 = 10 m/s.

To find the distance travelled, we can use the formula:

distance = average velocity * time

Since the object is accelerating uniformly, the average velocity can also be represented as (initial velocity + final velocity) / 2.

To calculate the distance Fatima travels while accelerating uniformly from 5 m/s to 15 m/s in 13 seconds:

distance = (initial velocity + final velocity) * time / 2

Given:

Initial velocity (u) = 5 m/s

Final velocity (v) = 15 m/s

Time (t) = 13 seconds

Using the formula:

distance = (u + v) * t / 2

distance = (5 + 15) * 13 / 2

distance = 20 * 13 / 2

distance = 260 / 2

distance = 130 meters

Therefore, Fatima travels a distance of 130 meters while accelerating uniformly from 5 m/s to 15 m/s in 13 seconds.

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Answer:

Heavier than 2.2 pounds

Explanation:

This question involves the concept of Colomb's Law and electrostatic force.

The electrostatic force will be "0.2 N".

According to Colomb's Law, every charge exerts an electrostatic force on the other charge, which is directly proportional to the product of the magnitudes of both the charges and inversely proportional to the square of the distance between them.

\(F=\frac{kq_1q_2}{r^2}\)

where,

In case of +2 C charges:

Therefore,

\(0.1\ N = \frac{(9\ x\ 10^9\ N.m^2/C^2)(2\ C)(2\ C)}{r^2}\\\\r^2=\frac{(9\ x\ 10^9\ N.m^2/C^2)(2\ C)(2\ C)}{0.1\ N}\\\\r^2=3.6\ x\ 10^{11}\ m^2\)

Now, for the second case:

Therefore,

\(F=\frac{(9\ x\ 10^9\ N.m^2/C^2)(2\ C)(4\ C)}{3.6\ x\ 10^{11}\ m^2}\)

F = 0.2 N

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Answer:

\(\boxed{ V_{2}= 0.03189 m^3}\)

Explanation:

According to Charles Law

=> \(\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\)

Where \(V_{1}\) = 0.0279 m³, \(T_{1}\) = 280 K and \(T_{2}\) = 320 K

=> \(\frac{0.0279}{280} = \frac{V_{2}}{320}\)

=> \(V_{2}\) = 0.03189 m³

Answer: \(2.7*10^{-2} km/h\)

Explanation:

First you need to know the units that your quantity has. Velocity is given in length divided by time. So to transform from m/day to km/h we need to convert separately length from m to km and time from day to h. For length we have:

1km -------- 1000m

x ------------ 64m

x = 64/1000 = 64*\(10^{-3}\) km

Next we convert the time:

1 day = 24h

And now we just make the proper substitution:

\(64\frac{m}{day} = \frac{64m}{1 day} = \frac{64*10^{-3} km}{24 h} = \frac{64*10^{-3}}{24} \frac{km}{h} = 2.7*10^{-2} km/h\)

Note that our result has two significant figures (2.7) since 10 to -2 does not count as significant figures.

The product among alcohol, gasoline, travel souvenirs, cigarettes that will have elastic demand is cigarettes.

Elastic demand refers to a situation in which a change in the price of a good or service results in a more significant change in the amount demanded. When the percentage change in quantity demanded is greater than the percentage change in price, the demand for the product is said to be elastic.

When the quantity demanded of a product decreases significantly when the price rises, the demand for the product is said to be elastic. Similarly, when a slight change in price causes a significant change in quantity demanded, the demand is said to be elastic. Conversely, if a product's price increases by a small percentage, and the demand for the product decreases by a smaller percentage, the demand for the product is said to be inelastic.

Cigarettes, of all the products listed above, are likely to have an elastic demand.

This is because smokers who are addicted to cigarettes are more likely to quit smoking or reduce their consumption in response to an increase in the price of cigarettes compared to the other goods.

Thus, a slight increase in the price of cigarettes is likely to cause a significant decrease in the number of cigarettes consumed.

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Answer:

v = 2.85 m/s

Explanation:

Given that,

A skipper on a boat notices wave crests passing his anchor chain every 5.6 s.

The distance between wave crests to be 16 m.

We need to find the speed of the waves. The speed of a wave can be calculated by the formula as follows :

\(v=f\lambda\\\\v=\dfrac{\lambda}{T}\\\\v=\dfrac{16}{5.6}\\\\v=2.85\ m/s\)

So, the speed of the wave is 2.85 m/s.

The max speed before child starts to slip is 2 rad/s when the coefficients of static and kinetic friction are given.

The greatest relation of applied force to normal force when there is no motion is known as the coefficient of static friction. We all understand that a force called friction resists motion. If we carefully observe, there is a moment at which the body resists movement once force is applied to move it from rest. The applied force must be larger to move the body against this resistance. The coefficient of static friction is the maximum resistance the body can muster in order to maintain its condition of motion.

It is known as a force that works between moving surfaces as kinetic friction. A force acting in the opposing direction of the movement of a body on the surface is felt. The coefficient of kinetic friction between the two materials will determine the amount of the energy.

In this question,

At critical speed, centrifugal force on child must be equal to maximum static friction mω²r=μv,

Where radius is 2m.

coefficient of static friction μ=0.8

and M= mass of child.

Reaction force, N = mg.

mω²r= μmg

= √(μg/r)

Substituting the values, we get,

ω= √(0.8×10)/2

ω= 2 rad/s

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The charge on the positive plate of a parallel plate capacitor remains the same when a dielectric material is inserted between its plates.


In an ideal parallel plate capacitor, the charge on the plates is determined by the voltage applied and the capacitance of the capacitor. When a dielectric material is inserted between the plates, it increases the capacitance of the capacitor.
The dielectric material affects the electric field between the plates by reducing the electric field strength. This reduction in electric field strength results in an increase in the capacitance of the capacitor. However, the charge on the plates remains constant.
To understand this, consider the formula for capacitance:
C = ε0 * A / d
where C is the capacitance, ε0 is the permittivity of free space, A is the area of the plates, and d is the distance between the plates.
When a dielectric material is inserted, the permittivity (ε) of the material comes into play. The permittivity of the dielectric material is greater than ε0, which leads to an increase in the capacitance. However, since the charge on the plates remains constant, the increase in capacitance is compensated by a decrease in the electric field strength between the plates.

In conclusion, when a dielectric material is inserted between the plates of an ideal parallel plate capacitor, the charge on the positive plate remains the same. The presence of the dielectric material only affects the capacitance of the capacitor, not the charge on the plates.

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