which of the following is the reason that a fixed pulley makes work easier?

At some speed, the drag or force of resistance will equal the gravitational pull on the object. At this point the object ceases to accelerate and continues falling at a constant speed called the terminal velocity (also called settling velocity).

Using Ohm's law, which is I = V / R, for a circuit with 250 volts and 25 ohms, the current is calculated to be 10 amps.

If a circuit has a voltage of 250 volts and a resistance of 25 ohms, we can calculate the current in amps using Ohm's law, which states that I = V / R (where I is current, V is voltage, and R is resistance). In this case, the current I equals 250 volts divided by 25 ohms, which equals 10 amps. Therefore, the circuit would have a current of 10 amps flowing through it.

Final answer:

To calculate the current in the circuit, use Ohm's law: current (I) = voltage (V) divided by resistance (R). In this case, the current in the circuit is 10 amps.

Explanation:

To calculate the current in the circuit, you can use Ohm's law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage is 250 volts and the resistance is 25 ohms. So, the current can be calculated as:

I = V/R = 250 V / 25 Ω = 10 amps

So, the current in the circuit is 10 amps.

Electromagnet is in form of solenoid

and the magnetic field due to solenoid is given as

[tex]B = \mu_0 n i[/tex]

here

i = current in the loop

so when we increase the current in electromagnet the magnetic field of the solenoid will increase

this will increase the strength of the electromagnet

so the answer would be

INCREASE

Formula

Primary Turns /Primary Voltage = Secondary Turns/Secondary Voltage

Givens

Solution

300 / x = 600 / 75                   Cross multiply

600*x = 300 * 75                   Combine the right

600*x = 22500                      Divide by 300

x = 22500/600                      Do the division

x = 37.5                                   Answer

Answer:

We know that,

  The ratio between voltages in the coils is the same as the ratio of number of turns in the coil

Equation:  (Vp / Vs) = (Np / Ns)

Ns, Np = no.of turns on secondary and primary coils respectively

Vs, Vp = no.of turns on secondary and primary voltages respectively

                   (Vp / Vs) = (Np / Ns)

                   Vp / 75 = (300 / 600)

                       Vp = 37.5 Volts

input voltage is 37.5 volts.

I would say the answer is true

light travels fastest through a vacuum which means "empty space, void"

Answer:

a). Vacuum

Explanation:

As we know that the refractive index of the medium is defined as

[tex]Refractive \: index = \frac{c}{v}[/tex]

here we know that

c = speed of light in vacuum

v = speed of light in medium

so here we know that

[tex] v = \frac{c}{\mu}[/tex]

so speed will be maximum for that medium for which value of refractive index is minimum

So here from all given options minimum refractive index is for vacuum

so correct answer will be

a). Vacuum

What? What is the question??

A mouse with curled whiskers migrates from one forest community to another?

Is there a question?

This should help look at the pictures?

mass of the bottle in each case is M = 0.250 kg

now as per given speeds we can use the formula of kinetic energy to find it

1) when speed is 2 m/s

kinetic energy is given as

[tex]K = \frac{1}{2}mv^2[/tex]

[tex]K = \frac{1}{2}(0.250)(2)^2 = 0.5 J[/tex]

2) when speed is 3 m/s

kinetic energy is given as

[tex]K = \frac{1}{2}mv^2[/tex]

[tex]K = \frac{1}{2}(0.250)(3)^2 = 1.125 J[/tex]

3) when speed is 4 m/s

kinetic energy is given as

[tex]K = \frac{1}{2}mv^2[/tex]

[tex]K = \frac{1}{2}(0.250)(4)^2 = 2 J[/tex]

4) when speed is 5 m/s

kinetic energy is given as

[tex]K = \frac{1}{2}mv^2[/tex]

[tex]K = \frac{1}{2}(0.250)(5)^2 = 3.125 J[/tex]

5) when speed is 6 m/s

kinetic energy is given as

[tex]K = \frac{1}{2}mv^2[/tex]

[tex]K = \frac{1}{2}(0.250)(6)^2 = 4.5 J[/tex]

Record your calculations in Table B of your Student Kinetic energy is the half of the product of mass and square of velocity. If the mass is given which is 0.250 kg. By putting values in the formula we will get values of the kinetic energy of different speeds. Kinetic energy depends upon the mass and velocity of the objects. When the speed of the bottle is 2 m/s, the KE is kg m2/s2. When the speed of the bottle is 3 m/s, the KE is kg m2/s2. When the speed of the bottle is 4 m/s, the KE is kg m2/s2. When the speed of the bottle is 5 m/s, the KE is kg m2/s2. When the speed of the bottle is 6 m/s, the KE is kg m2/s2.                                                                                                                                                    

MASS(kg)      SPEED(m/s)       FORMULA       KINETIC ENERGY(kgm2/s2)

0.250                   2                = ½ (0.250)(2)^2                0.5

0.250                   3                = ½ (0.250)(3)^2               1.125

0.250                   4                = ½ (0.250)(4)^2.                2

0.250                   5                = ½ (0.250)(5)^2               3.125

0.250                   6                = ½ (0.250)(6)^2                 4.5

Answer:

D.  825 km/hr westward

Explanation:

In order to solve the problem, we should define a positive and a negative direction for the velocities.

Let's take positive (+) as westward and negative (-) as eastward.

1) Relative to the ground, the air is moving eastward at 82 km/h, so the air velocity is [tex]v'=-82 km/h[/tex]

2) Relative to the air, the airplane is moving westward at 907 km/h, so its velocity is [tex]v=+907 km/h[/tex]

In the reference system of the ground, the velocity of the airplane will be given by the velocity of the airplane in the reference system of the air (v) plus the velocity of the reference system of the air relative to the ground (v'):

[tex]V=v+v'[/tex]

Therefore, substituting:

[tex]V=907 km/h+(-82 km/h)=+825 km/h[/tex]

And the sign (+) means its direction is westward.

Answer:

Option 2)

Burned gases will not be released into the surrounding air.

Explanation:

Given that the exhaust system on a heat engine is not functioning properly.

An exhaust system is a system which transfers  waste gases and other combustion products away from an automobile engine.

This system is the reason for  the vehicle to operate with minimal noise, smoke and pollution transmitted to the environment.

An improperly maintained exhaust system leads to the storage of burned gases inside only because the system is essential to the clean and efficient operation of the car

So option 2 is right.

Final answer:

The malfunctioning exhaust system will result in burned gases not being released into the surrounding air, interrupting the engine's ongoing cycle of operations. Option B

Explanation:

If the exhaust system on a heat engine is not functioning properly, the most accurate effect this will have on the engine is that burned gases will not be released into the surrounding air.

The exhaust system's primary function is to expel the combustion byproducts, which is crucial for making room for the fresh fuel-air mixture to enter and start the next combustion cycle.

Without this operation, the engine would not be able to sustain the series of intake, compression, combustion, and exhaust cycles that are necessary for continuous operation.

3700000 no problem ok

To increase the voltage from 30 V to 150 V with seven turns in the primary coil of a step-up transformer, the secondary coil would need to have 35 turns.

The subject of the question is the calculation of the number of turns in the secondary coil of a step-up transformer which is used to increase the voltage from 30 V to 150 V. When working with transformers, we apply the transformer equation which relates the number of turns in the primary coil (Np) to the number of turns in the secondary coil (Ns), as well as the primary voltage (Vp) to the secondary voltage (Vs):

Vp / Vs = Np / Ns

Using the values provided in the question, we have 30 V for the primary voltage (Vp) and 150 V for the secondary voltage (Vs). Also, there are seven turns in the primary coil (Np). Plugging these values into the formula, we can solve for Ns (number of turns in the secondary coil):

30 V / 150 V = 7 turns / Ns

Cross multiply to find:

Ns = (150 V * 7 turns) / 30 V

Ns = 1050 turns / 30

Ns = 35 turns

Therefore, the secondary coil would need to have 35 turns to achieve the desired step-up in voltage.

Given that:

mass (m) = 70 Kg ,

height (h) = 4 m = S ,

time (t) = 12 s,

Determine Power P = ?

                            P = rate of doing work = Work ÷  time    

                             Work = F × S         Joules                

                                       =  (70 × 9.81 ) × 4           since F = m.g

                                       =  2746.8 × 4

                                       =  10987.2  J

                                 Work  = 10.98 KJ

                        Now, Power = 10.98 ÷ 12

                                          P  =  0.915 KW  or 915 W

Answer:

Power, P = 228.67 Watts

Explanation:

It is given that,

Mass of bed, m = 70 kg

It is lifted to a top of 4 meter i.e. h = 4 m

Time taken, t = 12 seconds

We have to find the power required to lift the bed. The work done per unit time is called power. Mathematically, it is given by :

[tex]P=\dfrac{W}{t}[/tex]

[tex]P=\dfrac{mgh}{t}[/tex]

[tex]P=\dfrac{70\ kg\times 9.8\ m/s^2\times 4\ m}{12\ s}[/tex]

P = 228.67 watts

Hence, the power required to lift the bed is 228.67 Watts.

a=Δv/Δt=(30.0-18.0)/8.0=12.0/8.0=1.5 m/s²

Answer:

Acceleration of the car, [tex]a=1.5\ m/s^2[/tex]

Explanation:

It is given that,

Initial speed of the car, u = 18 m/s

Final speed of the car, v = 30 m/s

Time taken, t = 8 s

We need to find the acceleration of the car. Let it is given by a. It can be calculated using the first equation of motion.

[tex]v=u+at[/tex]

Where

a is the acceleration of the car.

[tex]a=\dfrac{v-u}{t}[/tex]

[tex]a=\dfrac{30-18}{8}[/tex]      

[tex]a=1.5\ m/s^2[/tex]

So, the magnitude of the car's acceleration is [tex]1.5\ m/s^2[/tex]. Hence, this is the required solution.                                          

Explanation :  

1. Four types of traditional state of matter.

Solid state : in this state , the molecules of the matter  very close to each other that means molecules closely bound together. they are not capable to move. in solid, particles have very low kinetic energy. solid have definite shape.

Liquid state : In this state, the molecules of the matter are far away to each other. They are capable to move. in liquid , particles have more kinetic energy . liquid have  a definite volume.

Gases state : In this state, the molecules of the matter are not bound together that means the molecules are free to move . they have high kinetic energy .

gas has no definite volume and no definite shape.

Plasma state : Plasma consist of charged particle with high kinetic energy.

2. Two parts of the atomic theory of atoms.

(I). All matter is made of atom.

(II). Compounds are made by  the combination of two or more different type of atoms.

3. Element is a matter which is made by the atoms.

Example : hydrogen is made by one proton and one electron.

So, we can say that hydrogen is the element and one proton and one electron are the atoms.

4.  Scientific theory : Scientific theory is based on the real fact and logical system of science. this theory is experimentally proof.

Scientific theory is always true .

5. Plasma is the different state from the other state of matter.  Because plasma made by the group of positive and negative charge particle.

6. Plasma  : Plasma is the one state of the matter. it is consist of charged particles which have high kinetic energy .

Example : stars, lighting

Answer:Data collected from one seismic station can only determine the distance from the epicentre to this station, thus producing a circle with a radius of that distance. If we have two stations, there will be two circles, and these two circles will have two intercepting points (can't determine the exact location). Therefore we need to add another circle, hence another station to know the exact location of the epicentre.

Explanation:

Answer:

Example of Newton's III law

Force = mass × acceleration

We know that the force is 80 Newtons and our mass is 20 kilograms therefore by substituting those values in our equation we have:

[tex]F=ma\\\\a=\frac{F}{m}=\frac{80N}{20kg}=4m/s^2[/tex]

Therefore the acceleration is 4 m/s^2.

Using Newton's second law of motion, the acceleration of an object with a mass of 20 kg and a net force of 80 Newtons on it can be calculated by dividing the net force by the mass. Thus, the acceleration of the object is 4 m/s².

The question is asking for the acceleration of an object with a given mass and net force acting on it. According to Newton's second law of motion, the acceleration of an object is the net force acting on it divided by its mass. Thus, to find the acceleration, we use the formula F = ma, where F is the net force, m is the mass, and a is the acceleration.

For an object with a mass of 20 kg and a net force of 80 Newtons acting on it, we replace F with 80 N and m with 20 kg, and solve for a:

a = F/m = 80 N/20 kg = 4 m/s².

So, the acceleration of the object is 4 meters per second squared (4 m/s²).

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D. Land is heated by conduction

Answer:

Land is heated through radiant energy.

Explanation:

Hope this helps!

A carpenter using saws and cutting tools as the tools make loud noises.

Answer:

a carpenter using saws and cutting tools

Explanation:

In noise cancelling system we know that two sounds are cancelled just by using the concept of destructive interference.

Here when two sounds which are in opposite phase are superimposed with each other then due to this superposition of waves the resultant intensity will be less than the intensity of any individual wave.

This phenomenon is known as destructive interference.

This is used to decrease the level of sound in such a part of work where we have large sound in output so here correct answer will be

a carpenter using saws and cutting tools

This is because it produce large noise while we use this cutting tools

Before a person walks through burning coal, the person will make sure their feet are very wet. When they start walking on the coal, this moisture will evaporate and form a protective gas layer underneath the person's feet. You can see examples of this if you happen to drip some water on a hot stove or any very hot surface. The water will very easily glide around on top of a newly formed layer of air underneath it -- like air hockey pucks on an air hockey table. Note that when someone walks through burning coal, typically this is also done very quickly to prevent a great deal of exposure to possible harm. By walking quickly, thinking positively, and letting the water cushion you from immediate danger over a short distance, such a task is possible. You may have also heard of physics teachers demonstrating how this principle works by sticking their hand first in a bucket of water and then quickly in a bucket of boiling molten lead. In the lead, their hand is protected briefly by a layer of gas from the evaporated water (the water vapor). I'm fairly sure that there is a name for this particular layer of gas, but I'm afraid the name is beyond me at the moment. In other words, water vapor has a low heat capacity and poor thermal conduction. Very often, the coals or wood embers that are used in fire walking also have a low heat capacity. Sweat produced on the bottom of people's feet also helps form a protective water vapor. All of this together makes it possible, if moving quickly enough, to walk across hot coals without getting burned. WARNING: Do not attempt to perform any of the actions described above. You can seriously injure yourself. Answered by: Ted Pavlic, Electrical Engineering Undergrad Student, Ohio St.  (citing my source)

The sensation of feeling cold while walking barefoot on a tile floor after being on a carpet can be explained by the different rates of heat transfer. Conduction is the main mechanism at play, where heat is transferred through direct contact between objects. The tile floor conducts heat more effectively than the carpet, leading to a quicker loss of heat from the feet.

The sensation of feeling cold on the kitchen tile floor after walking barefoot across the living room carpet can be explained by different rates of heat transfer. Heat is transferred through three main mechanisms: conduction, convection, and radiation. In this case, conduction is the main mechanism at play.

Conduction is the transfer of heat through direct contact between objects. The rate of heat transfer through conduction depends on factors such as the temperature difference between the objects, the thermal conductivity of the objects, and the contact area between the objects.

In the given scenario, the tile floor conducts heat more effectively than the carpet, causing a quicker loss of heat from the feet in contact with it. This makes the sensation of cold more intense compared to the carpet.

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Answer:

63.0 N

Explanation:

According to Newton's second law, the resultant of the forces acting along the horizontal direction is equal to the product of mass and acceleration:

[tex]F_{net}=ma[/tex] (1)

The box is moving at constant velocity, so the acceleration is zero: a=0, and so the net force is also zero.

The net force consists of two forces:

- The horizontal component of the push, given by:

[tex]F_x = F cos \theta[/tex]

where [tex]\theta=20^{\circ}[/tex]

- The frictional force, acting in the opposite direction of the push:

[tex]F_f = \mu mg[/tex]

where [tex]\mu=0.3021[/tex] is the coefficient of friction, m=20 kg is the mass of the box and g=9.8 m/s^2.

Therefore, eq.(1) becomes

[tex]F_x - F_f =0\\F cos \theta - \mu mg =0[/tex]

From which we find the push, F:

[tex]F=\frac{\mu mg}{cos \theta}=\frac{(0.3021)(20 kg)(9.8 m/s^2)}{cos 20^{\circ}}=63.0 N[/tex]

To keep a 20kg box moving at a constant velocity, a force of 58.836 N is needed.

To keep a 20kg box moving at a constant velocity, we need to apply a force equal to the force of friction. The force of friction is calculated by multiplying the coefficient of friction (0.3021) by the normal force on the box. The normal force is equal to the weight of the box, which is 20kg multiplied by the acceleration due to gravity (9.8 m/s²). Therefore, the force of friction is (0.3021)(20kg)(9.8 m/s²) = 58.836 N.

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B. 24 ohms. D. Touch/hold feature

D. From negative to positive =negative charges

B. 24 ohms.

in parallel, combined resistance is less than the lowest resistance

Final answer:

The Touch/Hold feature of a DMM allows measurement reading after removing the probes. Electrons travel from negative to positive, and the total resistance of a 40 ohm and 60 ohm resistor in parallel is 24 ohms.

Explanation:

The feature of a Digital Multimeter (DMM) that allows you to connect the test probes in the circuit, remove the probes, and then read the measured value on the display is known as the Touch/Hold feature. When answering the direction electrons travel, they move from negative to positive, which corresponds to conventional current direction from positive to negative in circuit theory.

Regarding the circuit containing a 40 ohm resistor and a 60 ohm resistor connected in parallel, the total resistance value you should read with a DMM is calculated by using the formula for parallel resistance: 1/R_total = 1/R1 + 1/R2. In this case, it would be 1/R_total = 1/40 + 1/60, which gives R_total = 24 ohms after calculating the sum and inverting it.

Displacement is a vector which means it has direction and can have positive or negative values. Distance is a scalar which means it has no direction and positive only.

Sally walks 10 meters forward and then 5 meters backwards. Forward is postive and backward is negative. Her displacement is +10+(-5) = +5m and her distance is 10+5=15m. So the answer is B) Sally's displacement is 10m less than her distance travelled.

Newton 2nd law states that force = ma.  In free fall, the only force is gravity force which is equal to mg where g is gravitational acceleration.  The acceleration is always the same because B) acceleration due to gravity is always the same.

Sally walks 10 meters forward and then 5 meters backwards.

forward + backward -

displacement= +10 -5 = +5

distance= 10 + 5 = 15

15-5=10m

so B) Sally's displacement is 10m less than her distance travelled.

Free fall is a situation in which the only force acting upon an object is gravity. force=massxacceleration n gravity force=massx gravity acceleration

so acceleration=gravity acceleration=constant.

ans is B) acceleration due to gravity is always the same

Acceleration is slower, so it's going to be negative:

a=Δv/Δt=(v-v₀)/t=(60-45)/5.0=15/5.0=3 m/s²

Answer:

Acceleration of the car is 3 m/s^2

Explanation:

Given that,

Initial speed of the car, u = 60 m/s (towards north)

Final speed of the car, v = 45 m/s (towards north)

Time taken, t = 5 s

To find :

The magnitude of the acceleration of the car.

Solve :

Let a is the acceleration of the car. It is equal to the rate of change of velocity. Its formula is given by :

[tex]a=\dfrac{v-u}{t}[/tex]

[tex]a=\dfrac{(45-60)\ m/s}{5\ s}[/tex]

[tex]a=-3\ m/s^2[/tex]

[tex]|a|=3\ m/s^2[/tex]

Negative sign shows the car is decelerating.

Therefore, the magnitude of the car's acceleration is 3 m/s^2.

Given that,

Distance, s = 14 m

Time, t = 2 minutes = 2*60 = 120 s

Velocity = ?

Since, we know that,

Velocity = Distance / time

V = s/t

V = 14/ 120

V= 0.11667 m/s

The average velocity of Sandra will be 0.11667 m/s

Sandra’s average velocity is 0.1166 m/s

Explanation:

Velocity is a vector quantity and it is defined as the rate of change in displacement with respect to time. So ratio of displacement to time taken for that displacement or distance covered will give the magnitude of velocity.

Average velocity is defined as the average of different velocities exhibited by the object to cover different distances in different time intervals. As here only one distance and one time interval is given, average velocity of Sandra will be equal to the magnitude of velocity of Sandra.

So as Sandra moves 14 m distance in 2 m time, the velocity is

            [tex]\text {Average velocity }=\text {Magnitude of Velocity}=\frac{\text {Distance}}{\text {Time}}[/tex]

As the time is given in the units of minute, it should be converted to seconds. So the next step will be

    [tex]\text { Average Velocity }=\frac{14 \mathrm{m}}{2 \times 60 \mathrm{s}}[/tex] = 0.1166 m/s

The answer option which not true about mechanical waves is: B. they transfer matter.

A wave can be defined as a disturbance in a medium that progressively transports energy from its source to another location, without the transfer (transportation) of matter.

In Science (Physics), there are two main (2) types of wave and these are:

Some of the properties or characteristics of mechanical waves include the following:

I. Mechanical waves generally carry energy.

II. Mechanical waves can be longitudinal in nature.

III. Mechanical waves require a medium of propagation.

IV. Mechanical waves do not transfer matter.

In conclusion, both electromagnetic and mechanical waves do not transfer matter at all.

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Refractive index is expressed as a ratio of speed of light in vacuum relative to the speed of considered medium. As it is a ratio and the units m/s or km/h cancel out each other. Therefore, the qauntity refractive index does not have any unit. I hope it will be helpful to you. Thank you

Final answer:

The normal force on the box resting on an inclined plane with a specific angle and coefficient of static friction is is 425 N.

Explanation:

The normal force on the box can be calculated using the formula:

N = mg cos(θ)

where N is the normal force, m is the mass of the box, g is the acceleration due to gravity, and θ is the angle of the incline. Plugging in the values:

N = 50 kg * 9.8 m/s^2 * cos(30°) = 425 N

Therefore, the normal force on the box is 425 N.