A biker pedals with a constant acceleration to reach a velocity of 7.5m/s over 4.5s. During the period of acceleration, the bike's displacement is 19m. What was the initial velocity of the bike?

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.

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.

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

The answer is Absorption.

The Absorption one

and im writing more cause 20 character thing

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.

Here ya go.  Check it out.

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

The answer is 2,1,3,2

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

hope this helps :)

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.

depends on the speed limit

the same speed. its only sneezing.

Answer: motion energy : energy related to an object’s movement

thermal energy : energy of motion of particles in a substance  

gravitational potential energy :  energy related to height

chemical energy :stored energy related to positions of atoms within molecules

nuclear energy : energy released when a nucleus splits or combines

sound energy : energy generated by vibration of a string

Explanation: Motion energy is also called as kinetic energy and it is defined as the energy possessed by an object due to its motion.

Thermal energy is the measure of total kinetic energy of the particles in a substance. The greater the motion of particles, the higher is the temperature of the substance and thermal energy.

Potential energy is defined as the energy possessed by an object due to its position or height.

Chemical energy is the energy stored in the bonds of the molecules.

Nuclear energy is the energy possessed in the form of binding energy which held the protons and neutrons together in the nucleus.

Sound energy is  the energy possessed by an object by virtue of vibration of matter.

Answer:

The answers are:

Stored energy related to positions of atoms within molecules: Chemical energy

Energy released when a nucleus splits or combines: Nuclear energy

Energy related to an object’s movement: Motion energy

Energy related to height: gravitational Potential energy

Energy generated by  vibration of a string: Sound energy

Energy of motion of particles in a substance: Thermal energy

Explanation:

I took the test and got this question right.

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.

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 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.

Answer:

Weight of the dog on surface of earth is 140.14 Newton.

Given:

mass of the dog = 14.3 kg

To find:

Weight of the dog = ?

Formula used:

Weight of the dog is given by,

W = mg

Where, W = weight of the dog

m = mass of the dog

g = acceleration due to gravity

Solution:

Weight of the dog is given by,

W = mg

Where, W = weight of the dog

m = mass of the dog = 14.3 kg

g = acceleration due to gravity

W = 14.3 × 9.8

W = 140.14 Newton

Weight of the dog on surface of earth is 140.14 Newton.

The dog weight on Earth is 140.14 N.

To calculate the weight of an object on Earth, we use the formula:

Weight (N) = Mass (kg) × Gravitational Acceleration (m/s²)

On Earth, the gravitational acceleration is approximately 9.8 m/s². Given that the mass of the dog is 14.3 kg, we can find its weight as follows:

Now, multiplying these values:

Weight = 14.3 kg × 9.8 m/s² = 140.14 N

Therefore, the dog's weight on Earth is 140.14 Newtons (N).

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.

Answer:

d

Explanation:

Light waves coming from the sun can be converted into electricity though the solar cell. Hence, option D is correct.

A solar cell, also known as a photovoltaic cell, is any apparatus that directly converts light energy into electrical energy using the photovoltaic effect. The vast majority of solar cells are made of silicon, which can be found in amorphous (noncrystalline), crystalline, and crystalline (single crystal) forms, with varying degrees of efficiency and cost.

Solar cells do not use redox energy or require fuel to generate electricity, making them unlike batteries. They also do not include any moving parts, making them unlike electric generators.

Arrays, which are big collections of solar cells, are possible. These arrays, made up of thousands of individual cells, can serve as central electric power plants, converting solar energy into electrical energy and distributing it to consumers in the industrial, commercial, and residential sectors.

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  a₁=2.9 m/s^2          t₁=8 s

   v₁=a₁*t₁= 2.9*8 m/s

  a₂=-1.7 m/s^2          t₂=2.7 s

   v₂=v₁-a₂*t=2.9*8-1.7*2.7 m/s

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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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.

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

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.

Answer:

Ocean currents might change course

Explanation:

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

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.

The correct answer is C. Velocity is a vector and requires a direction.

Explanation:

In physics both speed and velocity are used to study the motion of a body; however, they are slightly different. In the case of speed, this describes the rate of change in position based on distance and time, because of this, speed is based on a magnitude or quantity. On the other hand, velocity is a vector because it does not only includes a change of position but the direction of motion usually based on a specific location reference.

Considering this, it can be concluded the difference between speed and velocity is that "velocity is a vector and requires a direction" because velocity includes both the distance and time (speed) along with the direction while speed focuses only on time and distance.

The difference between speed and velocity is that C) velocity is a vector and requires a direction

Vector is a quantity that has a value and direction

Vector can be symbolized in the form of directed line segments

[tex]\large {\boxed {\bold {\overrightarrow{A}}}[/tex]

while the length of the vector is denoted by | a |

Vectors can be written in the form of sequential pairs which shows their coordinates in the Cartesian plane: a (a₁, a₂)

with length

[tex]\large {\boxed {\bold {|a|=\sqrt{a_1^2+a_2^2}  }}[/tex]

If the direction of the vector is reversed, we get the vector -a which has the same length but in the opposite direction

Operations on vectors include addition and subtraction. Addition of vector a and vector b can be done in a triangular way where the base point of vector b coincides with the endpoint of vector a

The sum of the two is obtained by pulling the line segment from the base point of the vector a to the endpoint of the vector b which results in a new vector c

So a + b = c

If vector a is added by inverse b (-b) then the sum becomes a + (- b) = a-b

If a vector is multiplied by a scalar number (eg denoted by k) then the new vector becomes k | a |.

If k> 0, the new vector is in the direction of vector a, but if k <0 it will be in the opposite direction

A vector has a direction and a magnitude, while a scalar has only a magnitude.

Examples of scalars are: length, mass, time, speed

Examples of vectors are: force, acceleration, velocity

the average velocity

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Keywords: vector, speed, velocity

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.

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.