which of the following could be possible vector directions


A. North

B. South

C. West

D. 45 Degrees North of East

It's the old-but-important concept:  "Speed" depends on who's measuring it and how THEY're moving.  Different observers may very well observe different speeds, and they're all correct.  There's no such thing as "the REAL speed".

When you were a little kid, did you ever get on a moving escalator or walkway, and when you got to the middle, you turned around and walked the opposite way, so that somebody watching you from the outside would see you not moving at all ?

Say you're on a school bus that's driving 10 mph along the street pavement, and you get up out of your seat and run forward up the aisle at 10 mph.  Somebody outside the bus sees you passing them at 20 mph !

If instead, you run toward the BACK of the bus at 10 mph, somebody outside the bus sees you bobbing up and down but not moving forward or backward at all.

All this  problem is saying is:  The bus is driving along at 15 m/s.  A passenger on the bus puts his little baseball down on the floor on its little feet, and it runs backwards down the aisle, toward the back of the bus, at 15 m/s.  Somebody is standing outside looking into the bus as it passes by and the little baseball is scurrying toward the back of the bus.  How will HE describe the motion of the baseball ?    

Have you got it now ?

"Relative to the Earth" just  means how fast an object is passing the stores and telephone poles and people standing still ... things that are attached to the Earth.  "Relative to the bus" would mean how fast an object is passing by people sitting on the bus.

(45 km/hour west) · (0.5 hour) =

(45 · 0.5) · (km · hour west/hour) =

22.5 km west

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:

the acceleration will be 10 m/s^2

Explanation:

the force applied to an object and the acceleration of the object are directly proportional, as Newton's second law states:

[tex]F=ma[/tex]

where

F is the net force applied to the object

m is the object's mass

a is the object's acceleration

in the first example, a force F=45 N is applied to the object, giving it an acceleration of a=5 m/s^2. Therefore, the mass of the object is

[tex]m=\frac{F}{a}=\frac{45 N}{5 m/s^2}=9 kg[/tex]

In the second example, the force is doubled, so it will be F=90 N. The mass is still m=9 kg, so the acceleration will be

[tex]a=\frac{F}{m}=\frac{90 N}{9 kg}=10 m/s^2[/tex]

depends on the speed limit

the same speed. its only sneezing.

To determine how far from the base of the dorm Allison should stand to catch the ball, principles of projectile motion are applied using the known angle, speed, and vertical distance. The time of flight for the vertical motion is calculated first, then used to find the horizontal distance where Allison should be positioned.

To solve the problem of where Allison should stand to catch the ball thrown by Emily, we need to apply the principles of projectile motion. The ball is thrown at an angle of 30° below the horizontal with a speed of 14 m/s, and it falls a vertical distance of 4.0 m. We can use these parameters to calculate the time of flight for the vertical motion and then apply that time to the horizontal component of motion to find how far from the base of the dorm Allison should stand to catch the ball.

First, we calculate the time taken for the ball to drop 4.0 m using the equation of motion: s = ut + (1/2)gt², where u is the initial velocity in the vertical direction, g is the acceleration due to gravity (approximated as 9.8 m/s²), and s is the vertical displacement.

Since the vertical component of the initial velocity (u_y) is negative in this case (as the ball is thrown below the horizontal), we must consider u_y = 14sin(-30°) = -7 m/s. The vertical displacement is -4.0 m (downwards). Plugging these values into the equation, we can solve for t.

Once we've found the time t, we then calculate the horizontal distance using the horizontal component of the initial velocity (u_x): u_x = 14cos(30°). The horizontal distance (x) can be found using the equation: x = u_x * t.

Through these calculations, we will be able to determine the distance at which Allison should stand to catch the ball.

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Mass is the amount of matter that an object contains. Don't understand the question.. 100 grams of something is an amount of matter with a mass of 100 grams. I'm guessing composition

There are no accurate descriptions on the list of choices you provided.

Answer:

The SI System, Which is based on the metric has been more widely adopted than the english system and is harder to use.

Explanation:

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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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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Blueberries is the correct answer

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

Here ya go.  Check it out.

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.

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.

The object is at rest.

This is due to the fact hwen two forces act upon each other on opposite sides, the movement of the object does not change due to the net force equaling 0.

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 answer is 2,1,3,2

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

hope this helps :)

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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resultant velocity

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the coin velocity

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Keywords: vector, speed, velocity

Answer:

When a physical change occurs, the mass of the substance is conserved. This means that the total mass of the substance remains the same from beginning to end. The physical properties of the substance, such as size and shape, may change, but the amount of matter in the substance does not change.

Explanation:

The mass is conserved during a physical change is observed by the fact that the amount of matter in the substance does not change.

According to the principle of conservation of mass, a mass can neither be created or destroyed. It can only be converted into another form.

When a physical change occurs, the mass of the object is constant. The initial mass of the object is equal to the final mass of the object. The physical change like size and shape may occur, but the mass of the object does not change.

Learn more about  conservation of mass principle.

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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

  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

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).

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.

Answer:

Ocean currents might change course

Explanation:

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.

Instantaneous velocity is the rate of change of an object's displacement at a specific instant or point in time, as opposed to over an extended period.

The instantaneous velocity of an object is the rate of change of the object's displacement with respect to time at a specific instant. Unlike average velocity, instantaneous velocity considers not the total distance and total time but the position of the object at a particular instant. For example, if a car moves with different speeds and you want to know the velocity of the car at the 5th second, you would be looking for the car's instantaneous velocity at that specific time.

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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.