Why is it important to break down a long-term physical fitness goals into short-term physical fitness goals?

Answer:

lights need elewctricity

Explanation:

She still needs to measure the distance between the slits.

To determine the correct option among all the options, we need to know about fringe width in young's double slits experiment.

(Wavelength × separation between screen and slits)/separation between the slits.

Thus, we can conclude that she needs the distance between the slits to determine the wavelength of light.

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Answer:

360 km/h

Explanation:

The truck left the diner at 1.00 pm and arrived at Jersey City at 2.00 pm - This means that the total time of the trip was 1 hour:

[tex]t = 1 h[/tex]

The distance covered between the diner and Jersey City was 360 km:

[tex]S=360 km[/tex]

So, the average speed of the truck is given by the distance covered divided by the time taken:

[tex]v=\frac{S}{t}=\frac{360 km}{1 h}=360 km/h[/tex]

Answer:

average speed of the truck will be 60 km/h

Explanation:

Truck started his Journey from diner at 1:00 PM

It reached to the Jersey City at 7:00 PM

so here we have total time interval of journey for the truck motion is given as

[tex]t = 7 - 1 = 6 hour[/tex]

total distance = 360 km

so here we know that average speed is defined as

[tex]v_{avg} = \frac{distance}{time}[/tex]

[tex]v_{avg} = \frac{360 km}{6 h}[/tex]

[tex]v_{avg} = 60 km/h[/tex]

so average speed of the truck will be 60 km/h

Answer:

a. 2000 N

b. acceleration of the motorcycle would decrease

Explanation:

a. acceleration = (final speed - initial speed)/time

a = (30 - 0)/3 = 10 m/(s^2)

Force = mass * acceleration

F = 200 * 10 = 2000 N

b. If the the coefficient of friction between the tire and the pavement increased greatly, part of the force generated by the engine would go to overcome this friction, then the force that goes into acceleration of the motorcycle would be less than case a, as a consequence, its acceleration would decrease (mass remains the same).

Gravity.  That's the only force between the two objects.

If the power rating of the motor is 8x10^4 Watts and our equation for Power is:

[tex]Power=\frac{Energy}{time}=\frac{Work}{time}=\frac{Force \times Displacement}{time}\\\\P=Force \times Velocity[/tex]

Note that:

[tex]F=ma=mg[/tex]

where g is the average gravity on Earth which is approximately 9.8 m/s^2.

And so:

[tex]P=F \times V\\P=m \times g \times V\\\\\ m=\frac{P}{gv} \\\\[/tex]

[tex]m=\frac{8.1 \times 10^4 }{9.8 \times 3} =2755.1kg[/tex]

In terms of force:

[tex]F=mg=2755.1kg \times 9.8 \frac{m}{s^2}=27000N[/tex]

The maximum weight of motor that can lifted at the given speed is of 27000 N.

Given data:

The maximum power rating of the motor is, [tex]P = 8.1 \times 10^{4} \;\rm W[/tex].

The weight of elevator is, [tex]W = 1.8 \times 10^{4} \;\rm N[/tex].

The speed of motor is, v = 3.0 m/s.

Since, the power rating of motor is obtained due to the force experienced on the elevator. Then,

[tex]P = F \times v[/tex]

Solving as,

[tex]8.1 \times 10^{4} = F \times 3.0 \\F = 27000 \;\rm N[/tex]

Now, the force experienced on the elevator is due to the weight of motor. Then,

Force (F) = Weight of motor (W')

[tex]27000 = W' \\\\W' = 27000 \;\rm N[/tex]

Thus, we can conclude that the maximum weight of motor that can lifted at the given speed is of 27000 N.

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Answer:

He should use 90 for Q3 ⇒ answer A

Explanation:

Lets explain the meaning of Q3

Q1 is the "middle" value in the first half of the data set

Q2 is the median value in the set

Q3 is the "middle" value in the second half of the data set

The data are

76 , 79 , 81 , 83 , 85 , 86 , 89 , 91 , 93

The set has nine numbers, then Q2 is the fifth one

Q2 = 85

The first half of the data are:

76 , 79 , 81 , 83

The second half of the data are:

86 , 89 , 91 , 93

They are four numbers, then the middle one is the average of the

second and the third numbers

Q3 = [tex]\frac{89+91}{2}=90[/tex]

He should use 90 for Q3

Answer: The answer to this question is A

Explanation:

The principle of popular sovereignty, which states that all political power comes from the people, is best represented by the scenario where a senator holds town hall meetings to decide on their vote for gun control legislation. This shows direct influence of people's will on government decisions.

The principle of popular sovereignty, which holds that all powers of

government are directly or indirectly derived from the people, is best illustrated by the scenario where 'A senator holds town hall meetings to find out how citizens think she should vote on gun control legislation' (Option C). This scenario illustrates popular sovereignty as it exemplifies how the people's will is directly influencing governmental decisions. The senator is seeking the opinion of the citizens she represents before making a decision, thereby extending the power to the people. In the other options, the actions are either reactions to misconduct or a decision made by office holders rather than a direct involvement or representation of the citizens who form the true sovereign base of the government.

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A neutral atom must contain an equal number of protons and electrons. To have a neutral charge with two electrons, an atom would need two protons — as such, it is likely a helium atom. The number of neutrons doesn't affect the charge and can vary.

Your question involves understanding the structure of an atom, particularly relating to its protons, neutrons, and electrons. An atom is made up of two sections: the nucleus, which consists of protons and neutrons, and a surrounding region that contains electrons. The number of both protons and electrons in an atom determines its atomic number, and this in turn identifies the element.

For an atom to be neutral, it should have an equal number of protons (positively charged particles) and electrons (negatively charged particles). So if an atom has two electrons outside its nucleus, it must contain two protons in its nucleus to be neutral. This corresponds with the element helium. The number of neutrons can vary without affecting the charge, so while the most common isotope of helium contains two neutrons, alternatives with one or no neutrons exist.

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Hey there!

If you're working with Newton's  Laws / Acceleration, the formula would mostly like look like this

[tex]F= MA[/tex] or you could say → [tex]A = \frac{F}{M}[/tex]

While the [tex]F[/tex] variable represents [tex]net[/tex]    [tex]forces[/tex] of your car  and the [tex]m[/tex] represents the mass of the car [tex]mass[/tex]

Denominator: [tex]2,410[/tex]

Numerator: [tex]698[/tex]

Your equation: [tex]\frac{2410}{698}[/tex] ( if you simplify that ←) then you have found your result!

[tex]Answer: \boxed{C) 3.45 m/s^2}[/tex]

Good luck on your assignment and enjoy your day!

~[tex]LoveYourselfFirst:)[/tex]

Magnet

In general the magnet is a special kind of metal (alloy), it attracts other metals or or magnet closer to it.

The earth is a magnet, because it attracts everything towards it.

compass:

A compass is needle, which is magnetized and mounted in measuring devices (like, pressure gauge, voltmeter, watt meter, etc.) such that it rotates freely. In the measuring devices the needle turns until one end points north and other south.

Demonstration:

Let us consider an ordinary bar magnet and a regular compass, Now move  the regular compass around the bar magnet (circling) , and observe it, what happen?

Yes, you will notice the needle rotates in the regular compass. When you  bring the compass  near the bar magnet, the needle of the compass points to the south and when the compass away from a bar magnet, the needle moves to the  north pole. So we conclude that the north end of the compass attracted to the south end of the magnet.  

Correct answer is Availability of soil minerals.

There are two types of limiting factors that affect plant population in a ecosystem. They are:

Biotic factors includes food, diseases etc. Such as Invasive weed species, seed dispersal by wind, disease-causing fungal spores are examples of biotic limiting factor.

Abiotic factors include sunlight, temperature and chemical environment. The availability of soil mineral is an example of abiotic limiting factor. Growth of plant population depends on availability of soil minerals.

In the context of an ecosystem, an abiotic limiting factor refers to non-living elements that may limit a plant's survival or growth. Among the options provided, 'Availability of soil minerals' serves as an abiotic limiting factor.

The question asks for an abiotic limiting factor, which refers to non-living aspects of an ecosystem that could limit a plant's growth or survival. In this case, the correct answer would be 'Availability of soil minerals.' Soil minerals are considered abiotic because they are non-living elements of the environment. They can limit plant growth if they are in short supply, as plants require specific minerals to carry out various biological functions. For example, nitrogen is a critical soil mineral that plants use to produce proteins and DNA.

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θ = angle of the incline surface from the horizontal surface = 25⁰

μ = Coefficient of friction = 0.15

m = mass of the person = 65 kg

[tex]f_{k}[/tex] = kinetic frictional force acting on the person as he slides down

mg = weight of the person acting in down direction

[tex]F_{n}[/tex] = normal force by the incline surface on the person

the free body diagram showing the forces acting on the person is given as

A. The vector goes from (4,0) to (3-2)

(x,y)

Answer:

10.0 kg

Explanation:

The problem can be solved by applying the law of conservation of momentum - the total momentum before the collision must be equal to the total momentum after the collision:

[tex]p_i = p_f\\m_A u_A + m_B u_B = m_A v_A + m_B v_B[/tex]

where:

[tex]m_A = 5.0 kg[/tex] is the mass of ball A

[tex]u_A = +20 m/s[/tex] is the velocity of ball A before the collision

[tex]m_B = ?[/tex] is the mass of ball B

[tex]u_B = +10 m/s[/tex] is the velocity of ball B before the collision (same sign of uA, since they are moving in same direction)

[tex]v_A = +10 m/s[/tex] is the velocity of ball A after collision

[tex]v_B = +15 m/s[/tex] is the velocity of ball B after collision

Re-arranging the equation, we can solve to find mB, the mass of ball B:

[tex]m_B u_B - m_B v_B = m_A v_A - m_A u_A\\m_B = \frac{m_A (v_A -u_A)}{u_B -v_B}=\frac{(5.0 kg)(10 m/s-20 m/s)}{10 m/s-15 m/s}=10.0 kg[/tex]

car suspension

guitar string

clips for hanging clothes

keyboards buttons

elevators

The five examples from daily life in which you see periodic motion caused by a spring or cord are car suspension, guitar string, clips for hanging clothes, keyboards buttons and elevators.

The motion which repeats itself after a fixed time period is called the periodic motion.

In daily life, every machine or simple machine we use is operated from a mechanism. The mechanism which involves the use of spring or cord for giving motion is elevator. The other examples are car suspension, guitar string, clips for hanging clothes and keyboards button.

Thus, the examples which shows periodic motion are listed above.

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Work done to move the box is 100Joules.

The work done by any object is equal to the product of force applied and the distance moved by the object.

W =F.s

Given is the Force F =10N and distance moved s =10m

Then , the work done will be

W =10N x 10m

W =100J

Thus, the work done is 100J

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Answer:A Male,age 50

Explanation:

From forensic odontology description of a Male at age 50 to have a skull characteristic of no milk teeth, deep rooted maxillary due to change in structure of the canine teeth and no wisdom tooth.

The skull fits that data, if the data is A forensic deontologist examines the teeth of a skull and finds no baby teeth, no wisdom teeth, deep roots in the maxillary cuspids, and substantial tooth degeneration to a male of age 50, so option A is correct.

The skull's supporting bones. The skull is made up of facial bones and cranial bones, which surround and protect the brain (bones that form the eye sockets, nose, cheeks, jaw, and other parts of the face). The spinal cord and brain are joined by a gap at the base of the skull. Similar to the cranium.

According to forensic ontology, a male with a skull characteristic of age 50 had no milk teeth, a deep-rooted maxilla due to a change in the structure of the canines, and no wisdom teeth.

Therefore, the skull fits that data, if the data is A forensic deontologist examines the teeth of a skull and finds no baby teeth, no wisdom teeth, deep roots in the maxillary cuspids, and substantial tooth degeneration to a male of age 50.

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Light behaves like both waves and particles.

The correct answer is C) Light behaves like both waves and particles.

The statement that best describes how today’s scientific community views light is "Light behaves like both waves and particles."

Light comes from the Sun. Light travels at 186 miles per second. The distance between the Sun and the Earth is 93 million miles. So energy travels in waves of light scientists called electromagnetic energy, that is vibrating patterns of electricity and magnetism. It was Isaac Newton that said that light was a particle, but Christian Huygens said that it was a wave. But today’s scientific community views light is that light behaves like both waves and particles.

4.89-4.18/4.18x100 = 0.71/4.18x100~1/6x100~16.7%

Answer:

16.98%

Explanation:

Given:

True value of specific heat of water = 4.18 J/g°C

Measured value of specific heat of water = 4.89 J/g°C

Percentage error can be calculated as follows:

[tex]error\% = \frac{|\text{True value-measured value}|}{\text{True value}}\times 100\% \\ e = \frac{|4.18-4.89|}{4.18}\times 100\% = 16.98\%[/tex]

Answer:

A) remain at 0 m/s2.

Explanation:

A skydiver has reached the point where the force of air resistance equals the force of gravity. Until she opens her parachute, her acceleration will

A) remain at 0 m/s2.

B) continue increasing.

C) continue decreasing.

D) remain at 9.8 m/s2.

resistive force is the force exerted by air on an object passing through it.

at the point point where the force of air resistance equals the force of gravity.we say the sky driver has reached the terminal speed

Terminal speed is the speed at which the force from the weight of the skydriver equals the force of air resistance, so the acceleration is zero. when the change in velocity is zero, then the acceleration becomes zero.

A long distance runner is running the 10000 m race. He runs the first 2000 m in 5 minutes, the next 5000 m in 14 minutes and the final 3000 meters in 7 minutes so the runner’s average speed is 6.41 m/sec.

The average speed is the total distance travelled by the object in a particular time interval. The average speed is a scalar quantity. It is represented by the magnitude and does not have direction.

Divide the whole distance by the total time required for him to go from the starting point to the finishing point to solve this type of problem. The entire distance in this instance is ten thousand meters, and the total time is the sum of the timings that were stated (which is 26 minutes, or 1560 seconds). By dividing these two figures, the following is the average speed,

average speed = 1000÷1560

average speed =  6.41 m/sec

The runner’s average speed is 6.41 m/sec.

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The atomic number is unique to each element and represents the number of protons in the nucleus of that atom. Therefore, it can be used to identify which element an atom belongs to.

The atomic number of an atom signifies the number of protons in the nucleus of that atom.

This number is unique to each element, making it a reliable identifier.

For example, Hydrogen has an atomic number of 1, which means it has 1 proton, while Helium has an atomic number of 2, indicating it has 2 protons.

No two elements share the same atomic number, hence, the atomic number can be used to identify an atom and determine which element it belongs to.

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Answer:

C.As the two objects touch, thermal energy flows as heat from the warmer block to the colder block until particles in both blocks move at the same rate and reach the same temperature.

Explanation:

Heat is the transfer of thermal energy from an object at higher temperature to an object at colder temperature.

The temperature of an object is a measure of how fast the particles in the object move: the higher its temperature, the faster the particles move, the higher the average kinetic energy of the particles in the object. As a result, the particles of the object at higher temperature tend to transfer more energy (called thermal energy) to the particles of the object at colder temperature by colliding with them: this process continues until the particles of the colder object reach the same average kinetic energy as the particles of the warmer object, and this means that the two objects have reached the same temperature.

Remember the headline:  ENERGY IS NEVER CREATED OR DESTROYED

The amount of energy before and after are always equal.  All we ever do with energy is move it around from one place to another.

a). A crane can't create energy.  Lifting the same rock in 20 different ways always takes the same amount of work.  It doesn't matter whether one person picks the rock straight up, or 50 people get around it and lift it, or roll it up a ramp, or lift it with 16 pulleys and a mile of rope, or use a giant steam crane.

You want to lift a 2200N weight up 25m, you're going to have to supply

(2200N) x (25m) = 55,000 Joules of work.

c). YOU put out 55,000 Joules of energy.  It had to GO someplace. Where is it now ? ===>  It's the potential energy the rock has now, from being 25m higher than it was before.  That 55,000 Joules is NOW the potential energy  of the rock.

No energy was created or destroyed.  It just got moved around.  

55,000 Joules of energy began as nuclear energy in the core of the sun. Solar radiation carried it to the Earth. Plants absorbed it, and stored it as chemical energy.  You ... or a cow that you ate later ... ate the plants and took the chemical energy.  One way or the other, the chemical energy got stored in your blood and fat.  When you needed to put it out somewhere, you moved it into your muscles, and they converted it into mechanical energy.  Then you used the mechanical energy to exert forces.  Today, you used the original 55,000 joules to lift the flagstone, and NOW that energy is in the flagstone, 25 meters up off the ground !

The potential energy of the flagstone when it is 25m above the ground is  55000J.

The question concerns two aspects of physics: calculating the work done on an object and understanding the concept of potential energy. First, you correctly calculated the work done on the flagstone as 55000J. Now, for the potential energy of the flagstone when it is 25m above the ground, we use the formula for gravitational potential energy, which is P.E = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m/s2 on the surface of the Earth), and h is the height in meters.

To find the mass (m) of the flagstone, we use the relationship F = ma where F is the force (weight in this case, which is 2200N) and a is the acceleration due to gravity. This gives m = F/g. Substituting the values, we get the mass of the flagstone which allows us to calculate its potential energy at a height of 25m, using P.E = mgh.

It's important to understand that the potential energy of an object is directly related to its height above the ground and represents the energy stored within the object due to its position. In this case, assuming the flagstone is lifted vertically and no energy is lost, the potential energy at 25 meters would be equal to the work done to lift it, which is 55000J.

A is the answer. If an object is at rest and is in a state of equilibrium, then we would say that the object is at static equilibrium. Static means stationary or at rest. A common physics lab is to hang an object by two or more strings and to measure the forces that are exerted at angles upon the object to support its weight.

Answer:

A).  A platypus lies motionless on the sand.

Explanation:

As we know that equilibrium is defined as the system in the state of ZERO net force or zero acceleration condition.

So equilibrium is of two types

1) Static equilibrium : Here object will remain at rest and do not have any type of motion.

2) Dynamic equilibrium : Here object may move with constant speed in same direction so it will not have any acceleration.

So here

B.A tuna speeds up from 2 m/s to 3 m/s

C.A dolphin jumps out of the water

Not in equilibrium as speed is changing so acceleration is not zero

D.A zebra shark swims at a constant speed of 8 m/s

It is in dynamic equilibrium case where speed is constant

so correct answer will be

A.A platypus lies motionless on the sand.

V = speed of the plane with no wind = 250 mph

v = speed of wind  

consider the motion of the plane while traveling with the wind :

V' = speed of plane travelling in the direction of wind = V + v = 250 + v

d' = distance traveled = 300 miles  

t' = time taken to travel the distance  

time taken to travel the distance is given as  

t' = d'/V'

t' = 300/(250 + v)                                           eq-1

consider the motion of the plane while traveling against the wind :

V'' = speed of plane travelling against the direction of wind = V - v = 250 - v

d'' = distance traveled = 200 miles  

t'' = time taken to travel the distance  

time taken to travel the distance is given as  

t'' = d''/V''

t'' = 200/(250 - v)                                           eq-2

Given that :

time taken to travel 300 miles = time taken to travel 200 miles  

t' = t''

using eq-1  and eq-2

300/(250 + v)  = 200/(250 - v)

3/(250 + v)  = 2/(250 - v)

750 - 3 v = 500 + 2 v  

5 v = 250

v = 50 mph

By setting up an equation based on the given information and the concept of relative velocity, the speed of the wind can be found to be 50 mph.

You're looking for the speed of the wind, a classic problem that involves the concept of relative velocity. Here, the airplane's speed is impacted by the wind, either aiding its motion when it's flying with the wind, or hindering its motion when it's flying against the wind.

To calculate this, let's denote the speed of the wind as 'w'. When the plane is flying with the wind, its effective speed is (250 + w) mph, and when it's flying against the wind, its effective speed is (250 - w) mph.

Given the equation of speed which is the distance divided by time, we know that the time it takes to travel with the wind and the time it takes against the wind are the same from the question. Thus, distance over speed for both situations can be equated, i.e.:

300 / (250 + w) = 200 / (250 - w)

Solving that equation gives w = 50 mph.

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Answer:

Reactance

Explanation:

In an AC circuit, the capacitive reactance of a capacitor is given by:

[tex]X_C = \frac{1}{2 \pi f C}[/tex]

where

f is the frequency of the AC current

C is the capacitance of the capacitor

The reactance of the capacitor tells somehow the "resistance" of the capacitor to the passage of current through it. In fact:

- When the frequency of the AC current is zero (this means, we are in regime of DC current), the reactance becomes infinite, and this is true because the capacitor does not let the current pass through it)

- When the frequency of the AC current tends to infinite, the reactance becomes zero, and this is true because in this case the current changes direction so fast that the capacitor has not enough time to "block" the current, so the current almost no feels the presence of the capacitor.

B. The beam in a cathode ray tube was moved by an electric force.

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Answer: Quality is one of the characteristic of the sound which is not affected by the relative motion of an object.

Explanation: There are three characteristics of the sound which are pitch, loudness and quality.

Pitch depends on the frequency of the sound. The frequency varies in the case of the relative motion of the object.

Loudness depends on the amplitudes of the vibration. The amplitude also varies in the case of the relative motion of the object.

Quality is described by the word timber. The different sounds are produced by different sources. Therefore, It is not affected by the relative motion of the object.

Answer:

the answer is intensity on gradpoint

Explanation:

m = mass of the person = 82 kg

g = acceleration due to gravity acting on the person = 9.8 m/s²

F = normal force by the surface on the person

f = kinetic frictional force acting on the person by the surface

μ = Coefficient of kinetic friction = 0.45

The normal force by the surface in upward direction balances the weight of the person in down direction , hence

F = mg                                          eq-1

kinetic frictional force on the person acting is given as

f = μ F

using eq-1

f = μ mg

inserting the values

f = (0.45) (82) (9.8)

f = 361.6 N

Answer:

362 rounded, a p e x users

Explanation: