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Answer:

Speed = 0

Restoring force = maximum

Explanation:

Suppose this situation as a spring with a mass attached to it, that oscilates.

The force that the spring does (the restoring force in this case)  is something like

F = K*L

where K is the constant of the spring, and L is the difference between the length of the spring (stretched) and the length of the spring at rest.

Then, when the harmonic oscillator is at its maximum displacement, L takes its maximum value, which means that at this point the restoring force must also have a maximum.

And for the velocity, at this point we have the maximum displacement, this means that, if the mass was moving to the right, after this point the mass stops going to the right, and then returns to the equilibrium position to the left.

Then the velocity has a change of sign, (like an object that reached its maximum height) this means that at that exact moment, the velocity must be zero.

Then:

Speed = 0

Restoring force = maximum

Answer:

Explanation:

∑Fx = 0

F1 + F2 = 0

-12 + 2 = -10

force acting against the block is Fx = 10N to the right.

Force = mass * acceleration

where acceleration = 2.0 meters per second.

                       force = 10 N

                      mass = ??

plugin values into the formula:

10 = mass * 2.0

mass = 10 / 2.0

mass = 5 kg

mass on the block = 5kg.

Answer:

activity 2

Explanation:

Answer:

See answers below

Explanation:

Rate of runner   7 km/hr

Bird   =  28 km/ hr

  TIME bird flies to finish line     7.6 km / 28 km/hr  

         the runner covers distance in this time :

                    7.6 / 28  * 7   km   = 1.9 km

                        this leaves    7.6 - 1.9 km = 5.7 km   to the finish

           .....  the bird turns around

              now the two have a closing speed of 28 + 7 = 35 km/hr to cover

                 this   5.7 remaining km

                       time to meet =  5.7 km / 35 km/hr = .16285 hr

                         so the bird flies at 28 km/ hr for this remaining time

                                       = 4.56 km     added to the original 7.6 km before turning around = 12.16 km

Total time for the runner to finish   7.6 km / 7 km/hr = 1.086 hr

   the bird is flying at 28 km/hr for this entire time = 30. 4 km

Answer:

True

Explanation:

I just took the test and got 100

Answer:

C - empathy

Explanation:

Empathy is seeing a situation from someone else's point of view or putting yourself "in their shoes." Not sure how this one is physics but that's ok :)

The relative humidity is thirty-five percent is the data in which the sling psychrometer will record and is denoted as option C.

This is defined as the amount of water vapor which is present in air and is usually expressed as a percentage of the amount needed for saturation at the same temperature.

The instrument known as psychrometer is commonly used by scientist to measure the relative humidity of a given area and it does this by taking both a wet-bulb and a dry-bulb temperature reading which is then used to calculate the relative humidity of the given area.

Thus is done using computation tools or the use of psychrometric chart in other to read the results for the required accuracy needed which therefore makes it the most appropriate choice in this scenario.

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T-Bars outside of major construction projects is as supports for a dropped ceiling.

A flat metal plate at the bottom of a ribbed "T"-shaped bar that is driven into the ground. usually used to identify the locations of a water meter pit and chain link fence posts.

Metal bar stock is the same way. Round bar (also known as rod), rectangular bar (including square bar, the exceptional case with equal sides), and hexagonal bar are the three most used shapes (usually called hex bar for short).

Although it might seem out of place at the bar, this metal rail has a useful purpose. A few Reddit users described the purpose of the service bar rail, which separates clients from the area where drinks and employees enter and exit the establishment.

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The sports car moving at constant speed that travels 110 m in 5.4 s , then brakes and comes to a stop in a time of 3.7 s, have an acceleration of: -5 m/s²

The formula and procedure we will use to solve this exercise is:

Where:

Information about the problem:

Applying the velocity formula we get the (vi):

v = x/t

vi = 110 m / 5.4 s

vi = 20.37 m/s

Applying the acceleration formula we have:

a = (vf - vi) /t

a = (0 m/s - 20.37 m/s) /3.7 s

a = (-20.37 m/s) /3.7 s

a = -5 m/s²

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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The force on the bottom of the beaker is 8.31 N.

To calculate the force on the bottom of the beaker we are using the formula,

F = PA

Here we are given,

A = area of the beaker.

To calculate the force we have to calculate the pressure P first.

To calculate the pressure P we are using the formula,

P= ρgh

ρ=  density of water.

g= the acceleration due to gravity.

h=the height of the water.

Now we put the values in the formula, we get,

P= ρgh

Or, P= (1000)×(9.8)×(0.30)

Or, P= 2940 Pa.

From the above calculation we can say that the pressure P= 2940 Pa.

Now we put the values in the force formula,

F=PA

Or, F=  2940×[tex]\pi r^{2}[/tex]

Or, F = 2940×π×(0.03)²

Or, F= 8.31N

From the above calculation we can conclude that, The force on the bottom of the beaker is 8.31 N.

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Explanation:

A chemical change is one in which a new kind of matter has formed. It involves chemical reactions occurring within a given substance. For the mashed potato, some of the observations might be;

Answer:

380.1 kg

Explanation:

Answer:

F_{resultant} = 1 [m/s]

Explanation:

These types of problems can be solved by means of relative velocities, where vectors (forces or velocities) are necessarily handled, these velocities depending on the velocity are added or subtracted.

Forces to the right are taken as positive and negative to the left.

[tex]F_{velocity}-F_{air}=F_{resultant}\\2-1 = F_{resultant}\\\\F_{resultant} = 1 [m/s][/tex]

Answer:

People who may take this drug may have potential health risk because there is poor quality in that drug just because a drug doesn't exceed the weight limit doesn't mean quality doesn't matter quality matters just as much as the weight limit does  

Explanation:

Answer:

People who may take this drug may have potential health risk because there is poor quality in that drug just because a drug doesn't exceed the weight limit doesn't mean quality doesn't matter quality matters just as much as the weight limit does  

Explanation:

What must be known to determine the direction of the magnetic force on a charge? Check all that apply.

B- the amount of the charge

E- the strength of the magnetic field

To determine the direction of the magnetic force :

A) The type of the charge.

C) The direction of the magnetic field.

D) The velocity of the charge.

To determine the direction of the magnetic force on a charge is the type of the charge, the direction of the magnetic field, and the velocity of the charge.

The magnetic force, attraction or repulsion that emerges between electrically charged particles since of their movement.

It is the fundamental constrain dependable for such impacts as the activity of electric engines and the fascination of magnets for press.

Thus, the correct answer is A, C and D.

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Answer: Decomposition reaction.

Explanation:

Decomposition is a type of chemical reaction in which one reactant forms two or more than two products.

Decomposition reactions require breaking of bonds which require energy and thus all of the decomposition reactions are endothermic reactions. They require energy in the form of heat, electricity or sunlight and thus called as thermal, electrolytic and photolytic decomposition respectively.

The given reaction [tex]AB\rightarrow A+B[/tex] is a type of decpomposition reaction.

The rock's speed just before impact is 49 m/s and it will be the maximum speed of the rock.

The velocity of the rock before the impact is the final velocity of the rock and it depends on the initial velocity of the rock, time of motion and acceleration due to gravity.

The speed of the rock before the impact is calculated as follows;

v = u + at

where;

Substitute the given parameters and solve for the final velocity.

v = 0 + 9.8 m/s² x 5 s

v = 49 m/s

Thus, the rock's speed just before impact is 49 m/s and it will be the maximum speed of the rock.

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The wavelength of the displacement amplitudes is 124cm.

Frequency is the distance between two pinnacles (or box) of a wave and is consequently estimated in meters. Because of waves coming in all shapes and sizes, the prefix related with meters can change decisively from km for radio waves, micrometers for noticeable light (albeit frequently given in nanometers), to picometers for gamma beams. Albeit X-beams have numerous useful applications, utilizing them requires alert since openness can cause visual impairment, disease and different wounds. Frequency and recurrence are conversely related so that more drawn out waves have lower frequencies, and more limited waves have higher frequencies.

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Given that,

Electrical energy of the motor = 2280 J

Kinetic energy = 1606 J

Wasted energy in thermal and sound energy = 550 J

To find,

The efficiency of the motor in percent.

Solution,

Efficiency is defined as the ratio of useful output energy to the total energy.

Total energy = 2280 J

Useful energy = 1606 J

[tex]\eta=\dfrac{1606}{2280}\times 100\\\\=70.43\%[/tex]

So, the efficiency of the motor is 70.43%.

How a Inkjet printer uses electrical charges and tiny particles to print the image is discussed below.

We have a Inkjet printer which uses electrical charges and heat to fuse tiny plastic particles (called toner) to the paper.

The sufficiency or deficiency of electrons in a body leads to the development of electric charge in a body. Its unit is Coulomb. It can be either Positive or Negative in nature.

According to the question -

The statement mentioned in the question is true. The inkjet printers use electrical charges and heat to fuse tiny plastic particles (called toner) to the paper. Printers attract toner particles (with the help of electric charge) to a transfer roller. Toner particles are pressed onto a piece of paper, while heat and pressure from the fuser unit permanently fix the image onto the page.

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Answer:

23.1mL

Explanation:

Given parameters:

Initial volume of the gas = 25ml

Initial pressure  = 740torr

Final pressure  = 800torr

Unknown:

Final volume  = ?

Solution:

To solve this problem, we apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant"

         P₁ V₁   = P₂ V₂

P and V are pressure and volume

1 and 2 are initial and final states

       Insert the parameters and solve;

      740 x 25  = 800 x v₂

            v₂  = 23.1mL

Answer: Wave frequency can be measured by counting the number of crests (high points) of waves that pass the fixed point in 1 second or some other time period. The higher the number is, the greater the frequency of the waves. The SI unit for wave frequency is the hertz ( Hz ), where 1 hertz equals 1 wave passing a fixed point in 1 second.

Explanation:

Answer: friction has no role to play in this case. because friction usually occurs between to parts which come in contacts. examples (a)our joints in the human body (b)two mechanical parts (shafts).

Explanation:

However what this topic relates to is gravity. The pebble and paper both weigh one gram, but have different density this is the sole reason why if both are drop from same height the pebble would reach the ground faster than the paper because it is more denser. unlike the paper with a lesser density which would take a longer time to reach the ground.

Answer:

D is the correct answer

Explanation:

A) shows low accuracy and high precision since they missed the bull's-eye but are all grouped together.      

B) Shows high accuracy and high precision

C) Shows high precision

D  is the only one that shows both low accuracy and low precision

The illustration represents low accuracy and low precision is according to option D.

When in an experiment, a value is measured 5 times, then if the values measured are same for most of the time or like three times out of five, it said to be accurate. The phenomenon is accuracy.

Precision is about comparing the values to each other then find them near to each other.

Accuracy compares the experimental value to the theoretical value.

So, when all the values are close to each other but not nearest to the theoretical value, then it is said to be precise but not accurate.

Thus, the correct option for low accuracy and precision is D.

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Answer:

F = 9.81 [N]

Explanation:

To solve this problem we must use Newton's third le which tells us that the sum of forces on a body that remains static must be equal to one resulting from these forces in the opposite direction.

Let's perform a summation of forces on the vertical axis-y to determine the normal force N.

∑F = 0 (axis-y)

[tex]N - m*g = 0[/tex]

where:

m = mass = 4 [kg]

g = gravity acceleration = 9.81 [m/s²]

[tex]N - (4*9.81)=0\\N = 39.24 [N][/tex]

Now we know that the frictional force can be calculated using the following equation.

f = μ*N

where:

f = friction force [N]

μ = friction coefficient = 0.25

N = normal force = 39.24 [N]

Now replacing:

[tex]f = 0.25*39.24\\f = 9.81[N][/tex]

Then we perform a sum of forces on the X-axis equal to zero. This sum of forces allows us to determine the minimum force to be able to move the object in a horizontal direction.

∑F = 0 (axis-x)

[tex]F-f=0\\F-9.81=0\\F= 9.81[N][/tex]

If the coefficient was smaller, a smaller force (F) would be needed to start the movement, this can be easily seen by replacing the value of 0.25, by smaller values, such as 0.1 or 0.05.

If the coefficient were larger, a larger force would be needed.

The main morphological types of galaxies are elliptical, spiral, and irregular.

Based on their morphology , galaxies have been classified into 3 types namely elliptical, spiral, and irregular.

These galaxies have various sizes and shapes ranging from dwarf galaxies to giant galaxies.

Elliptical Galaxy:

Spiral Galaxy:

Irregular Galaxy:

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