A block is pulled to the right by a rope as shown above. Which of the following statements are true about the block?I. The normal force is equal to the weight.II. The normal force is mgcosθ.III. The horizontal component of F is Fcosθ.answer choice-I only.II and III onlyIII only.II only.I and III only.

The final velocity V is 40 km/h.

The final velocity V.

Mass of wagon m = 1000 kg

Initial velocity of wagon v = 50 km/h

Mass dropped velocity M = 250 kg

The final velocity =V

Initial system linear momentum [tex]P_{i}[/tex] = mv

=1000*50

=5*[tex]10^{4}[/tex] kg km/h

The system with the final velocity (wagon + mass dropped) be V .

Final system linear momentum [tex]P_{f}[/tex] = (m + M) V

=(1000+250)V

=1250 V

Basic principle of conservation of linear momentum,

[tex]P_{f}[/tex] = [tex]P_{i}[/tex]

1250V=5*[tex]10^{4}[/tex]

V=[tex]\frac{5*10^{4} }{1250}[/tex]

V= 40 km/h

So, the final velocity V is 40 km/h.

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Answer:

Chromatography is a process for separating components of a mixture. To get the process started, the mixture is dissolved in a substance called the mobile phase, which carries it through a second substance called the stationary phase.

Explanation:

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Answer:

Chromatography is a process for separating components of a mixture.

Explanation:

To get the process started, the mixture is dissolved in a substance called the mobile phase, which carries it through a second substance called the stationary phase.

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The ribbon was observed to oscillate perpendicular to the wave direction. Option A.

In transverse waves, particles move perpendicular to the direction of wave propagation. Examples of transverse waves are string vibrations and water waves. By moving the Slinky vertically up and down, you can create horizontal transverse waves. Her one type of mechanical wave is the transverse wave.

where the motion of the medium is perpendicular to the direction of energy propagation. A transverse wave is a wave whose vibration is perpendicular to the direction of wave propagation. This is in contrast to longitudinal waves, which propagate in the direction of oscillation. Water waves are an example of transverse waves.

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3.7996 seconds are needed to accelerate it.

acceleration is the rate of change in both speed and direction of velocity over time. When anything moves faster or slower in a straight line, it is said to have been accelerated. Because the direction is always shifting, motion on a circle accelerates even while the speed is constant.

So we have u= 0m/s, v=15m/s, s= 200m

So,2as= v^2-u^2

A= V^2 - U^2/2s

= 225/400

=0.5625 m/s^2

V=u + a*(t^2)

15=0+0.5625(t^2)

15-0.5625= t^2

=14.4375=t^2

root14.4375= root(t)

Time= 3.7996 seconds

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The time taken for the bullet moving with a speed of 600 m/s to hit a target  200 meters away is 3.33 s.

Time is the measured or measurable period during which an action, process, or condition exists or continues.

To calculate the time it takes the bullet to hit the target, we use the formula below.

Formula:

Where:

Make t the subject of the equation

From the question,

Given:

Substitute these values into into equation 2

Hence, the time it will take to hut the target is 3.33 seconds.

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Linear velocity (V) = r* w

where:

r = radius = diameter/2= 0.35 /2 = 0.175 m

w= angular velocity = rpm = 2500 = 2500/60 = 125/3 rps

1 revolution = 360° = 2pi rad/s = 125/3 2pi rad/s

= 261.8 rad/s

v = 0.175 m * 261.8 m/s = 45.8 m/s

The correct option is option (D)  occur in Nashville occur at the same coordinates.

In general proper time is the time interval  between two events as measured by an observer who sees the event occur at the same position.

In geometry, a coordinate system is a device that makes use of one or more numbers, or coordinates, to uniquely determine the location of the points or different geometric factors on a manifold which includes Euclidean area.

Math coordinates discover the vicinity of a factor on a graph or map. The ordered pair, (x, y) is the cope with of the factor. The Cartesian coordinate gadget is the graph used to locate the point. The graph is split up into four quadrants.

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The rollercoaster be moving once it reaches ground level with a speed of 23.21 m/s.

Applying work-energy theorem,

Work done by conservative forces on the body + work done by none conservative forces on the body = Total change in Kinetic Energy of the body.

Here, conservative forces are gravitational force and non-conservative force is frictional force,

MgH - Fr = 1/2MV² - 1/2MU²

Where,

M is mass of roller coaster,

g is acceleration due to gravity,

H is the height of the roller coaster,

Fr is the frictional force,

V is the final velocity of roller coaster,

U is the initial velocity of the roller coaster,

1500(9.8)(30) - 52000 = 1/2(1500)(V²-20.25)

(441000 -52000)2/1500 = V² - 20.25

518.67 = V² - 20.25

V² = 538.9

V = 23.21 m/s.

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The scientific study of all celestial objects is known as astronomy. Galaxies, planets, stars, comets, meteors, and other events affecting the celestial bodies are all observed and studied by astronomers.

The words "Astro," which means "star," and "nomos," which means "rule," are derived from ancient Greek. Astronomy, when combined, refers to "star law." The natural sciences are the ones that it is the oldest.

Since there are so many celestial objects to study, it is practical to divide astronomy into various branches.

Here are some of the more well-known astronomical fields-

1. Planetary Astronomy

2. Solar Astronomy

3. Stellar Astronomy

4. Galactic Astronomy

5. Observational Astronomy; etc.

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Explanation

Newton's third law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction.

let's check a box on a table

By wearing the helmet, the time isextended during which the change in momentum of the body takes place during the crash.

This increase in time for the force acting on the body will decrease the impact of force on the body.

In the given graph, the value of force on the head is less and time taken is more in the first graph.

Thus, the first graph (1) represent the wearing helmet case.

The force on the head is more and time is less in the second case.

Thus, the second graph (2) represents the without helmet case.

Answer:

a

Explanation:

after the universe reach the limit, gravity does its thing

The cannon ball will travel the highest distance when the angle of projection is 35 degrees.

The maximum height reached by a projectile is calculated using the following formula.

H = u²sin²θ/2g

where;

when the angle of projection is 25 degrees;

H = (15² (sin 25)²) / (2 x 9.8)

H = 2.05 m

when the angle of projection is 35 degrees;

H =  (15² (sin 35)²) / (2 x 9.8)

H = 3.78 m

Thus, the cannon ball will travel the highest distance when the angle of projection is 35 degrees.

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Answer:

Therefore the friction Force is 65 N.

Explanation:

Look at the image above.

The frictional force of the rubber block is 63.7N.

Friction is defined as a force that opposes the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are many types of friction such as dry friction which is defined as the force that opposes the relative lateral motion of two solid surfaces in contact.

This friction force is directed in the opposite direction to the motion of the object itself because the friction described so far between surfaces in relative motion is called kinetic friction.

For above given information,

mass of the block, m =10kg

coefficient of friction, µ=0.65

f=coefficient of the friction ×normal= µ*R

R= normal =mg = 9.8×10=98N

So, f =0.65×98=63.70N

≈65N(when g is taken as 10m/s²)

Thus, the frictional force of the rubber block is 63.7N.

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ANSWER:

0.011 J

STEP-BY-STEP EXPLANATION:

Given:

q = 150 μC

v = 75 V

r = 0.2

We calculate the work as the product between the charge and the potential difference, just like this:

The work required is 0.011 J

Given,

The radius of the wheel, r=0.300 m

The mass of the wheel, m=1.47 kg

The initial angular frequency of the wheel, f=4.00 rev/s

The time it takes for the wheel to come to a stop, t=56.4 s

The final angular velocity of the wheel, ω=0 rad/s

The initial angular velocity of the wheel is

From the equation of motion,

Where α is the angular acceleration of the wheel.

On substituting the known values,

The moment of inertia of the wheel whose mass is concentrated on the rim is given by,

The torque applied by the friction is given by,

On substituting the known values,

The negative sign of the torque indicates that the torque is applied to the wheel in the direction opposite to the direction of rotation of the wheel.

Thus the magnitude average torque due to frictional force is 0.06 Nm

The magnitude of the earth’s acceleration toward the apple with a mass of 0.38 kg is 6.2 × 10⁻²⁵ m/s².

Gravity is a fundamental force which is responsible for causing mutual attraction between all the things with mass or energy.

The gravitational force can be calculated by the formula:

F = m.a

where, F = force

m = mass of an object

a = acceleration of the object

Here, the mass of the apple, m = 0.34 kg

The acceleration of the apple towards the earth's surface (a) = 9.8 m/s²

The mass of the Earth, M = 5.98 × 10²⁴ kg

Now, by applying Newton's Law of the motion,  

The magnitude of the force on the apple due to Earth is can be calculated as:

F = m × a

F = 0.34 × 9.8

F = 3.724 N

According to the Newton's third law of motion, the apple must exert an equal but opposite force on Earth.

So, the magnitude of the force on Earth due to the apple will be:

F = 3.724 N

Let the magnitude of the earth’s acceleration towards the apple be 'A' m/s².

Thus, the magnitude of the earth’s acceleration towards the apple will be given by:

F = MA

M = mass of the Earth

A = acceleration of the Earth

3.724 = [5.8 × 10²⁴] × A

A = 3.724 / [5.8 × 10²⁴]

A = 0.6227 × 10⁻²⁴

A = 6.2 × 10⁻²⁵ m/s²

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If an electron travels 2.68 m in 6.11 × 10^-8 s, it will travel at a speed of 43.86 * [tex]10^{8}[/tex] cm / s

v = d / t

v = Velocity

d = Distance

t = Time

d = 2.68 m

t = 6.11 * [tex]10^{-8}[/tex]

v = 2.68 / 6.11 * [tex]10^{-8}[/tex]

v = 0.4386 * [tex]10^{8}[/tex] m / s

v = 0.4386 * [tex]10^{8}[/tex] * 10² cm / s

v = 43.86 * [tex]10^{8}[/tex] cm / s

One meter is equal to 100 centimeters. So in order to convert a meter value into centimeter, multiply the meter value by 100 or 10².

Therefore, the electron travels at 43.86 * [tex]10^{8}[/tex] cm / s

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Explanation

Step 1

let the fractions

so

a)This year the managers of the farm will change the fraction for the budget for housing to 1/8

so

b) hence,the total budget is

this year

Step 2

find the fractions for maintenance on each year:

as we are using fraction of the total budget, we need to set the sum of the fractions equals 1, hence

a) past year

b) this year

Step 3

now, find the difference

therefore, the answer is 5/24

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Since there is a wind speed of 50 km/h to the west, this speed needs to be compensated by the heading of the plane.

If we decompose the plane speed, one component will be used to cancel out the wind speed:

To find the orientation theta, we can calculate the east component of the plane speed and equate it to the wind speed:

Now, let's calculate the south component:

Calculating the required time of flight, we have:

Therefore the orientation is 9.59° east of south and the time required is 8.45 hours.

There are six half lives that have passed within 34,200 years. When we assume that we have some of the products present initially, then we overestimate the age of the sample.

The half life is the time taken to obtain only half of the number of atoms that were originally present in the radioactive material. We know that living things do contain the carbon- 14 isotope together with the carbon - 12 isotope in the substance. When the organism dies, the carbon - 14 which is radioactive begins to decay and its half life could be used to estimate the age of the sample as we know.

Given that after each half life, we have only half of the original amount that remains. We would have 1/64 of the original amount left after six half lives and this means that 34,200 years have passed.

If we  the daughter product of carbon-14 is present in the sample when it forms (even before any radioactive decay happens), then we would over estimate the  age of the sample.

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1) Solid ,whose molecules are compactly arranged . so ,letter N  

2) liquid state -the state in which molecules are arranged neither too compact nor loose . SO, letter O is pure liquid

3) letter Q is a pure gas

The quantity of heat energy needed to convert a substance from a solid to a liquid is known as the heat of fusion. Enthalpy of fusion is another name for it. Joules per gram (J/g) or calories per gram (Cal/g) are typically used as its units. The solution to this example problem shows how to determine how much energy is needed to melt a sample of water ice.

The quantity of heat energy required to convert solid stuff into liquid is known as the heat of fusion (melting.)

Q = mHf is the formula for calculating heat of fusion.

The temperature is not a factor in the equation or the computation because matter does not truly change temperature when it changes states.

Heat of fusion is usually a positive value, with the exception of when melting helium.

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The average acceleration a of an object that changes its speed from v_0 to v_f during a time interval t is:

Since the car is initially moving at 25.0m/s and it stops in 3.00 seconds, then its final speed is 0m/s.

Replace v_f=0, v_0=25.0m/s and t=3.00s to find the average acceleration of the car:

Therefore, the average acceleration of the car when it stops from 25.0m/s in 3.00 seconds, is -8.33m/s^2.

The spring constant is  400 N/m and The mass which would produce an extension of 3.0 cm is 0.0459 kg.

Here we are dealing with a problem related to hook's law which states that the force required to expand or compress a spring by a few distances is corresponding to that distance. This can be expressed scientifically as F= -kx, where F is the force connected to the spring and x is the displacement of the spring, with negative esteem illustrating the displacement of the spring once it is extended; and here k is the spring constant.

For the first case, we are given the force applied which is 20 N, and the extended length which is 5cm =0.05 m,

So the spring constant will be, k= F/x=  20/0.05 = 400 N/m

For the second  case we are given that the spring constant which is 15 N/m  and the extension is 3.0 cm =0.03 m.

Since we know F= mg ( where g is the acceleration due to gravity )

So the hanging mass, will be

=>F= kx

=>mg=kx

=>m=kx/g

      =15 x0.03/9.8

     = 0.0459 kg

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Answer:

4500 N

Explanation:

Bc f is equal to mass times acceleration and the acceleration is 60

If a 75 kg student drives a 650 kg car, then the car starts from rest and accelerates to 60 m/s in 8 seconds, then the applied force on the car would be 5437.5 Newtons.

Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.

The mathematical expression for Newton's second law is as follows

F = m × a

As given in problem an If a 75 kg student drives a 650 kg car, the car starts from rest and accelerates to 60 m/s in 8 seconds.

The acceleration of the car = 60 / 8

                                             = 7.5 m / s²

The force applied on the car = 725 × 7.5

                                                = 5437.5 Newtons

Thus,  the applied force on the car would be 5437.5 Newtons.

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We will have the following:

1. Windmill: From wnd energy to mechanical energy.

2. Flashlight: From chemical energy to ligth energy and thermal energy.

3. Firecracker: From chemical energy to thermal energy and kinetic energy.

4. Bycicle: From mechanical energy to kinetic energy.

5. Microwave: From electric energy to thermal energy,

Ecology is the study of the way all living things relate to each other in the world.

This is referred to as the science which deals with the study of organisms and how they interact with their environment. It comprises of the study of the organisms present and their habitat.

Their habitat is the area where they live which comprises of many resources such as food, water etc which are needed for their growth and survival. The living things interact with it for beneficial reasons and is the reason why Ecology was chosen as the correct choice.

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