You are driving at the speed of 27.7 m/s (61.9764 mph) when suddenly the car in front of you (previously traveling at the same speed) brakes and begins to slow down with the largest deceleration possible without skid- ding. Considering an average human reaction, you press your brakes 0.507 s later. You also brake and decelerate as rapidly as possible without skidding. Assume that the coefficient of static friction is 0.868 between both cars’ wheels and the road. The acceleration of gravity is 9.8 m/s2 . Calculate the acceleration of the car in front of you when it brakes. Answer in units of m/s2.

by superposition method we can find current in R5

here first let say only 2V battery is present in the circuit

now the equivalent resistance to be found for which we can say

2.2 k ohm and 1 k ohm is connected in parallel

[tex]r_1 = \frac{2.2 * 1}{2.2 + 1}[/tex]

[tex]r_1 = 0.6875 k ohm[/tex]

now it is in series with 1 k ohm and then that part is in parallel with 2.2 k ohm

[tex]r_2 = \frac{2.2* (1+0.6875)}{2.2 + (1+0.6875)}[/tex]

[tex]r_2 = 0.95 k ohm[/tex]

now the current flowing through the battery is

[tex]i = \frac{2}{1 + 0.95} = 1.02 mA[/tex]

now this will divide into R3 and R2 so current flowing in R3 will be

[tex]i_1 = \frac{2.2}{2.2+1.6875}*1.02 = 0.58 mA[/tex]

now this will again divide in R4 and R5

so current in R5 will be

[tex]i_5 = \frac{R_4}{R_4 + R_5}* i_1 [/tex]

[tex]i_5 = 0.18 mA[/tex]

now when only 3 V battery is present in the circuit

R1 and R2 is in parallel and then it is in series with R3

so parallel combination will be

[tex]r_1 = \frac{1*2.2}{2.2 +1} = 0.6875k ohm[/tex]

also after its series with R3

[tex]r_2 = 1 + 0.6875 = 1.6875 k ohm[/tex]

now it is in parallel with R5 on other side

[tex]r_3 = \frac{1.6875 * 2.2}{1.6875 + 2.2} = 0.95 k ohm[/tex]

now current through the battery will be given as

[tex]i = \frac{3}{1 + 0.95} = 1.53 mA[/tex]

now it is divide in r2 and R5

so current in R5 is given as

[tex]i_5 = \frac{r_2}{r_2 + R_5}*i[/tex]

[tex]i_5 = \frac{1.6875}{2.2 + 1.6875} * 1.53[/tex]

[tex]i_5 = 0.67 mA[/tex]

now the total current in R5 will be given by super position which is

[tex]i = 0.67 + 0.18 = 0.85 mA[/tex]

so there is 0.85 mA current through R5 resistance

To calculate the current through R5 in Figure 8-71 using the superposition method, follow these steps: calculate the current through R1, find the voltage applied to the parallel combination of R2 and R3, calculate the current through R2, and conclude that the current through R5 is equal to that.

To calculate the current through R5 in Figure 8-71 using the superposition method, we need to consider the currents flowing through each resistor individually and then combine them. Here are the steps:

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Here ya go.  Check it out.

A time-varying magnetic field can be caused by fluctuating electric fields.

Answer:

-fluctuating electric fields

Explanation:

As we know that electric field and magnetic field is related by the equation given as

[tex]\int E. dl = -\frac{d\phi}{dt}[/tex]

here we know that

[tex]\phi = B.A[/tex]

now we have magnetic field is time varying

[tex]\int E.dl = -A\frac{dB}{dt}[/tex]

now for closed loop of radius "r" we will have

[tex]E(2\pi r) = - A\frac{dB}{dt}[/tex]

[tex]E = -\frac{A}{2\pi r}\frac{dB}{dt}[/tex]

so here this produce electric field as per above formula and it is also known as non conservative electric field.

It would be alto. I hope that is one of your answers.

Which cloud type is confined to the middle height range?

A.  cumulonimbus

B.  cirrus

C.  cirrostratus

D.  altostratus

Answer:

D.  Altostratus

Explanation:

Altostratus cloud is a type of physical stratiform: a cloud which can be identified by its gray or blueish gray colour. It is a middle level cloud, that is associated with a storm and excessive rain or snow. It contains ice crystals and water droplets, and it is lighter in colour when compared to nimbostratus, while it is darker in appearance when compared to cirrostratus.

The process of scientific method involves making hypotheses , driving predictions from them as logical consequences , and then carrying out experiments or empirical observations based on those predictions. A hypotheses is a conjecture , based on knowledge obtained while seeking  answers to the questions.

Answer: The scientific method is a systematic approach used by scientists to investigate and understand the natural world. It consists of several steps that help to ensure objectivity, accuracy, and reliability in the process of scientific inquiry.

It's important to note that the scientific method is an iterative process, meaning that scientists often repeat steps and refine their approach based on new information and insights gained from previous experiments. This helps to build a stronger understanding of the natural world and contributes to the development of scientific knowledge.

Explanation:

1. Observation: The scientific method begins with making careful observations about a phenomenon or event. This could involve gathering data, conducting experiments, or examining existing information.

For example, let's say you notice that plants in your garden are growing taller when they receive more sunlight.

2. Research: Once an observation is made, scientists conduct research to gather information and background knowledge related to the phenomenon they are studying. This can involve reviewing existing studies, reading scientific literature, or consulting experts in the field.

In our example, you might research how sunlight affects plant growth and find relevant studies on the topic.

3. Hypothesis: After conducting research, scientists develop a hypothesis, which is a tentative explanation or prediction for the observed phenomenon. The hypothesis should be testable and based on the available evidence.

In our example, a hypothesis could be that increased exposure to sunlight promotes plant growth due to the role of sunlight in photosynthesis.

4. Experimentation: To test the hypothesis, scientists design and carry out experiments. This involves carefully controlling variables and collecting data to analyze and draw conclusions from.

In our example, you might set up an experiment where you expose different groups of plants to varying amounts of sunlight and measure their growth over a period of time.

5. Analysis: Once the data is collected, scientists analyze it using statistical methods to determine if the results support or refute the hypothesis. This analysis helps to draw meaningful conclusions from the experiment.

In our example, you would analyze the data collected from the different groups of plants to see if the ones exposed to more sunlight indeed grew taller.

6. Conclusion: Based on the analysis of the data, scientists draw conclusions about the hypothesis. If the results consistently support the hypothesis, it may be considered valid. If not, scientists may revise the hypothesis and repeat the process.

In our example, if the plants exposed to more sunlight consistently grew taller, it would support the hypothesis that increased sunlight promotes plant growth.

The velocity of the satellite will be 200 kmph.

Since the satellite is in deep space, and there is nothing to restrict the motion of the satellite (No atmosphere or no friction), therefore the stopping of engine will not affect the velocity of the satellite.

Therefore the velocity of the satellite after few minutes will be 200 kmph.

True. It would be false if the statement was "trunk rotation is the most common static flexibility assessment."

So, you're answer should be "true". Hope that helped!

Answer:

The answer is False.

Explanation:

Your trunk doesn't have much flexibility and does not resemble a common dynamic flexibility.

Here refrigerator removes 55 kcal heat from freezer

Refrigerator releases 73.5 kcal heat to surrounding

So here we can use energy conservation principle by II Law of thermodynamics

the law says that

[tex]Q_1 = Q_2 + W[/tex]

here we know that

[tex]Q_1[/tex] = heat released to the surrounding

[tex]Q_2[/tex] = heat absorbed from freezer

W = work done by the compressor

now using above equation we can write

[tex]73.5 = 55 + W[/tex]

[tex]W = 73.5 - 55[/tex]

[tex]W = 18.5 kcal[/tex]

So here compressor has to do 18.5 k cal work on it

Final answer:

The work done by the refrigerator's compressor, when it removes 55.0 kcal of heat from the freezer and releases 73.5 kcal through the condenser, is calculated to be 77,464 joules, after converting kcal to joules.

Explanation:

To determine the work done by the compressor in a refrigerator when it removes 55.0 kcal of heat from the freezer and releases 73.5 kcal through the condenser on the back, we can use the principle of conservation of energy. According to the first law of thermodynamics, the energy extracted from the freezer plus the work done by the compressor equals the energy released into the environment through the condenser.

The work done by the compressor (W) can be calculated by subtracting the heat removed from the cold reservoir (Qc) from the heat added to the hot reservoir (Qh).

First, we need to convert the heat quantities from kcal to joules because the standard unit of energy in physics is the joule (J). 1 kcal = 4184 J, therefore:

Qc = 55.0 kcal * 4184 J/kcal = 230120 J

Qh = 73.5 kcal * 4184 J/kcal = 307584 J

Now, calculate the work done:

W = Qh - Qc = 307584 J - 230120 J = 77464 J

Therefore, the compressor performed 77464 J of work in this process.

The answer would be 0.04ohms.

Answer:

The resistance of an electric device is 0.04 ohms.

Explanation:

Given that,

Resistance = 40,000 micro ohms

We need to convert micro ohms to ohms

We know that,

[tex] 1 micro ohms = 10^{-6}\ ohms[/tex]

Therefore,

[tex]40000\ micro ohms=40000\times10^{-6}\ ohms[/tex]

[tex]40000\ micro ohms=0.04\ ohm[/tex]

Hence, The resistance of an electric device is 0.04 ohms.

I'm pretty sure the answer is the gravitational pull  increases

Answer:

if we increase the mass gravitational pull increases

Explanation:

According to gravitational law

Force between masses is given by [tex]F=\frac{Gm_1m_2}{R^2}[/tex], here G is gravitational constant [tex]m_1\ and\ m_2[/tex] are masses and R is distance between them

From the relation we cans see that gravitational pull is directly proportional to mass of the object

So if we increase the mass gravitational pull increases

Answer:

Range of arrow = 225.09 meter

Final horizontal velocity = 34.47 m/s

Explanation:

We have equation of motion [tex]s=ut+\frac{1}{2} at^2[/tex], where u is the initial velocity, t is the time taken, a is the acceleration and s is the displacement.

Considering the vertical motion of arrow ( up direction as positive)

   We have u = 45 sin40 = 28.93 m/s, s = -20 m, a = acceleration due to gravity = [tex]-9.8m/s^2[/tex].

   [tex]-20=28.93*t-\frac{1}{2} *9.8*t^2\\ \\ 4.9t^2-28.93t-20=0[/tex]

   t = 6.53 seconds or t = -0.63 seconds

   So time = 6.53 seconds.

Considering the horizontal motion of arrow

   u = 45 cos 40 = 34.47 m/s, t = 6.53 s, a = [tex]0m/s^2[/tex]

   [tex]s=34.47*6.53+\frac{1}{2} *0*6.53^2\\ \\ s=225.09m[/tex]

So range of arrow = 225.09 meter

Horizontal velocity will not change , final horizontal velocity = 34.47 m/s.

The answer is 2,1,3,2

1. increased production 2. rising demand (occurs twice) 3. increased hiring

hope this helps :)

semiconductors ... silicon, germanium etc ...

Answer:

Semiconductors

Explanation:

The resistivity of conductors is low and the resistivity of insulators is high. The materials having resistivity between conductors and insulators are called semiconductors.

For example, silicon, gemanium, etc.

The elements having valency +4 are the semiconductors.

By increasing the temperature os a semiconductor, the conductivity increases or by the process of dopping the conductivity of semiconductor also increases.

the force that resists the movement of a solid object through a fluid (liquid or gas). Hope this helps.

Fluid friction, or drag, is the force resisting the motion of an object through a fluid like water or air. It depends on factors such as fluid viscosity, object shape and speed, and contact surface area. Examples include a boat moving through water and air resistance on a falling parachutist.

Fluid friction, also known as drag, is the force that opposes the motion of an object through a fluid (liquid or gas). This type of friction occurs when layers of the fluid move at different speeds or directions. For instance, a boat moving through water experiences fluid friction between the hull and the water, which resists its motion.

Fluid friction is influenced by several factors, including the viscosity of the fluid, the shape and speed of the object, and the surface area in contact with the fluid. An example of this is air resistance, which acts on a parachutist falling through the atmosphere, slowing their descent due to the opposition force of the air.

The color reflected by a red object is red itself. Red color absorbs all colors but reflect red only. Hence, the bike painted red color will appear red only.

Reflection is the phenomenon of waves traveling through a medium when hit on a transparent object return, back in a straight line.  Reflection of light waves make the transparent object gleaming.

Different colors absorbs from different wavelengths. White light absorbs all colors and reflect all of them. That's why it appears as the mix of all colors white. Black color absorbs all color but reflect nothing. Thus appears black.

Red and green colors absorb all colors but, reflect the particular color only. Therefore, the bike painted red color will reflect red and appears red only.

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The color of light reflected by a bike painted red is red because the paint absorbs other colors and reflects red wavelengths. The perceived color of an object is determined by the specific wavelengths of light it reflects due to its pigments.

If your new bike is painted so that it looks red, then the color of light reflected by the paint is red. This is because the paint absorbs other wavelengths of light and only reflects the red wavelengths to your eyes. The principle behind why objects have color can be explained by absorption and reflection of light. When white light (which is a mixture of all visible wavelengths) hits an object, certain wavelengths are absorbed, and others are reflected. The reflected light is what we perceive as the color of the object.

Therefore, for a red bike, the paint contains pigments that specifically absorb most of the other colors in the light spectrum but reflect red light. Similarly, a blue object would reflect blue light and absorb other colors, which answers why a blue section of a color wheel looks blue. Likewise, a yellow section appears yellow because it reflects red and green light, which together make yellow, and absorbs blue light.

There will be two different possiblites as

May be one is in rest or other move

May be both will be in motion

According to Conservation Law of Momentum, when the two objects collide with each other, they transferred their kinetic energy to keep their momentum before or after collisions remain constant. In the present example, one moving car collides with another car which is at rest and has the same weight. There will be two possibilities after the collision as an elastic collision or perfect inelastic collision. In the elastic collision, the one car will adopt the rest position after the collision and transfer it K.E to make the rest car at the movable position. In the perfect inelastic collision, both cars will move after the collision.

Answer:

It attains the same speed as the first car.

Answer:

Nickel - Transitional Metal

Potassium- Alkali Metal

Cadmium- Transitional Metal

Calcium- Alkaline Earth Metal

Barium- Alkaline Earth Metal

Explanation:

Answer:

Nickel - Transitional Metal

Potassium- Alkali Metal

Cadmium- Transitional Metal

Calcium- Alkaline Earth Metal

Barium- Alkaline Earth Metal

Explanation:

50 kilometers should be it

Answer:

13.89 m/s

Explanation:

Velocity=Displacement/Time

Explanation:

75 km = 75000 m

1.5 hours = 5400 sec

Applying the formula

Velocity =75000 m 5400 s = 13.89 m/s

vector A has magnitude 12 m and direction +y

so we can say

[tex]\vec A = 12 \hat j[/tex]

vector B has magnitude 33 m and direction - x

[tex]\vec B = -33 \hat i[/tex]

Now the resultant of vector A and B is given as

[tex]\vec A + \vec B = 12 \hat j - 33 \hat i[/tex]

now for direction of the two vectors resultant will be given as

[tex]\theta = tan^{-1}\frac{12}{-33}[/tex]

[tex]\theta = 160 degree[/tex]

so it is inclined at 160 degree counterclockwise from + x axis

magnitude of A and B will be

[tex]R = \sqrt{A^2 + B^2}[/tex]

[tex]R = \sqrt{12^2 + 33^2} = 35.11 m[/tex]

so magnitude will be 35.11 m

Final answer:

The direction of the resultant vector A› + B› is 20.1° north of the negative x-axis, and its magnitude is approximately 35.1 m.

Explanation:

To find the direction and magnitude of the resultant vector A› + B›, we can use vector addition. Vector A› points in the positive y direction and has a magnitude of 12 m, so its components are (0, 12). Vector B› has a magnitude of 33 m and points in the negative x direction, with components (-33, 0). By adding these components, we get the resultant vector R = A + B = (0 - 33, 12 + 0) = (-33, 12).

To find the magnitude of the resultant vector, we use the Pythagorean theorem:

|R| = √((-33)^2 + (12)^2) = √(1089 + 144) = √(1233) ≈ 35.1 m

The direction of resultant vector R can be found by calculating its angle θ with respect to the negative x-axis (since the x component is negative) using the tangent function:

θ = arctan(|12| / |-33|) = arctan(12 / 33) ≈ 20.1°

The direction is therefore 20.1° above (north of) the negative x-axis.

Given:

Acceleration is uniform and acceleration (a) = 10 m/s^2

Now it has been mentioned for the first 2 secs the acceleration is 10m/s^2 .

Hence velocity= acceleration x time

Velocity= 10 x 2 = 20 m/s

Consider s as the distance traveled in the 3rd second.

Now we know s= ut+1/2(at^2)

Where s is the distance measured in m.

u is the initial velocity measured in m/sec

t is the time taken for the object to travel the above distance. This is equal to one second as we need to calculate the distance traveled between 3rd and 2nd second.

t = (3-2)= 1 sec

Substituting the given values in the above formula we get

s = 20 x1 + 1/2 (10 x 1 x 1)

s = 25 m

Thus the distance traveled by the object in the 3rd second is 25 m

Answer:

Ocean currents might change course

Explanation:

The sum of all forces on an object is the net force or resultant force. If all the forces cancel out , resultant force is zero , otherwise unbalanced force will cause acceleration of object .

Force is the vector, has both direction and magnitude.

The sum of all forces acting on an object is called the net force. It takes into account the magnitude and direction of each individual force. Internal forces cancel out, resulting in a net force of zero, while external forces are added together vectorially to find the net force.

The sum of all forces acting on an object and their direction:

In physics, the sum of all forces acting on an object is called the net force. The net force takes into account the magnitude and direction of each individual force. To find the net force, you need to consider both internal and external forces.

Internal Forces:

Internal forces are the forces between different parts of the object. According to Newton's third law, these forces always come in pairs with equal magnitudes but opposite directions. When you add all the internal forces together, they cancel out and the sum of all internal forces is zero.

External Forces:
External forces are the forces applied to the object by external sources. The sum of all external forces is equal to the net force acting on the object. To calculate the net force, you need to add up all the external forces vectorially, taking into account their magnitudes and directions.

The answer is Absorption.

The Absorption one

and im writing more cause 20 character thing

initial speed of the stuntman is given as

[tex]v = 28 m/s[/tex]

angle of inclination is given as

[tex]\theta = 15 degree[/tex]

now the components of the velocity is given as

[tex]v_x = 28 cos15 = 27.04 m/s[/tex]

[tex]v_y = 28 sin15 = 7.25 m/s[/tex]

here it is given that the ramp on the far side of the canyon is 25 m lower than the ramp from which she will leave.

So the displacement in vertical direction is given as

[tex]\delta y = -25 m[/tex]

[tex]\delta y = v_y * t + \frac{1}{2} at^2[/tex]

[tex]-25 = 7.25 * t - \frac{1}{2}*9.8* t^2[/tex]

by solving above equation we have

[tex]t = 3.12 s[/tex]

Now in the above interval of time the horizontal distance moved by it is given by

[tex]d_x = v_x * t[/tex]

[tex]d_x = 27.04 * 3.12 = 84.4 m[/tex]

since the canyon width is 77 m which is less than the horizontal distance covered by the stuntman so here we can say that stuntman will cross the canyon.

Argon come from the air. It is a noble gas present in atmosphere. The percentage of argon in air is about 0.93%. Naturally, it is a colorless and odorless gas. When electrifies it gives a blue-green glow. Argon laser is used in field of medicine and surgery.

the correct  answer is 0.636.

As per doppler's Effect of sound we can say when subway is approaching the platform we will have

[tex]f_1 = f_o* \frac{v}{v- v_s}[/tex]

[tex]12750 = f_o* \frac{340}{340 - v_s}[/tex]

Similarly we can find the frequency when subway is passing away with same speed from us

[tex]f_2 = f_o* \frac{v}{v + v_s}[/tex]

[tex]10750 * f_o* \frac{340}{340 + v_s}[/tex]

now we can find the ratio of two

[tex]\frac{12750}{10750} = \frac{340 + v_s}{340 - v_s}[/tex]

[tex]1.186*(340 - v_s) = 340 + v_s[/tex]

[tex]403.26 - 1.186 v_s = 340 + v_s[/tex]

[tex]63.26 = 2.186 v_s[/tex]

[tex]v_s = \frac{63.26}{2.186}[/tex]

[tex]v_s = 28.94 m/s[/tex]

So the speed of subway is 28.94 m/s

Answer:

No, its not reasonable.

Explanation:

The substance that is to be dissolved is known as solute. The substance that is dissolving is known as solvent.

The amount of solvent  in the mixture should be greater than that of solute.

Suppose we are taking a solvent in a beaker and we are continuously adding solute in it. Initially the solute dissolve quickly. At some point the solute stops dissolving in the solvent. This is known as saturation point of the solvent. After saturation point if solute is added further it does not dissolve in the solvent.

So, its not possible to dissolve 12.8 g of one substance in 11 g of another.

I believe the answer is 56000 kgm/s

Answer:

Electromagnetic energy/force

Explanation:

Electromagnetism: Electromagnetism is an interaction that occurs between particles with electric charge via electromagnetic fields. It combines electrostatics and magnetism, distinct but closely intertwined phenomena. The electromagnetic force is dominant in the interactions of atoms and molecules.

Electric Forces: Electric forces cause attraction between particles with opposite charges and repulsion between particles with the same charge. These forces are described by Coulomb’s law for electricity.

Magnetic Forces: Magnetism arises from the interaction between charged particles in relative motion. The magnetic force acts perpendicular to both the velocity of the charged particle and the magnetic field.

Applications: Electromagnetism plays a vital role in technology, including electrical energy production, communication (fibre optics and wireless), sensors, computation, and mechanical motors. It also explains chemical bonding and the behaviour of atoms and molecules.

In summary, electromagnetic force governs the behaviour of charged particles and underpins much of our understanding of the physical world