A Vector is a quantity which has both magnitude as well as direction.
vectors follow parallelogram law of addition and uses cosine of the angle between the vectors.
The addition of two vectors, i.e. c, is given by the formula
c=[tex]\sqrt{a^2+b^2+2abcos\alpha }[/tex]
where [tex]\alpha[/tex] is the angle between the vectors
now we know that maximum value of cos[tex]\alpha[/tex] can be is 1
and minimum value of cos [tex]\alpha[/tex] can be-1
now the maximum value cos[tex]\alpha[/tex] is 1 at the angle of π/2
and the minimum value of cosα is -1 is at the angle of -π
Therefore, A and B should have 0 degree between them and in the same direction to have the maximum value
there fore they should be in same direction and 0 degree meaning they should be on same line
A and B will have minimum value when the angle is 180 degree which means they should be on same line and be inn opposite direction to each other.
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the gravitation force between any two building is negible ? why
It is true that between any two massive bodies. But, the masses of building and a person are very very small as compare to planets and stars. Hence, the gravitational pull is very weak, comparatively negligible.
Answer:
Yes they are negligible
Explanation:
Why- The gravitational force between 2 massas is independent of their sizes or distribution of mass of the bodies. The gravitational force between 2 bodies does not depend upon the presence or the absence of other bodies. If the masses of the body are small, the gravitational force between them is negligible.
Look at the diagram below. Are the lamps connected in series or in parallel?
The lamps shown in the diagram are connected in parallel.
Briefing :The impact on the output voltage and the capacity of the battery system is the primary distinction between wiring batteries in series and parallel. The voltages of batteries connected in series will be added. Batteries connected in parallel will have their amp-hour capacities added together.
Do batteries last longer in series or parallel?Because the voltage stays the same while the amps increase, parallel batteries last longer. It will still be a 12 volt system if you connect two 12v 50ah batteries in parallel, but because the amps double to 100ah, the batteries will last longer.
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What is centripetal force used for?
Centripetal force is used for making an object move in a circular path.
What is centripetal force?Centripetal force is the force on a rotating or orbiting body in the direction of the centre of rotation.
In other words, centripetal force is the force that makes an object move in a circular pattern.
Centripetal force is denoted by "F" and can be calculated by dividing the product of the mass and velocity squared by radius as follows:
F = mv²/r
Where;
F = forcem = massv = velocityr = radiusTherefore, it can be said that Centripetal force is used for making an object move in a circular path.
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What in front of a car does NOT absorb substantial force?
A- airbag
B- windshield
C- bumper
D- engine
The front of a car which does not absorb substantial force is referred to as engine and is denoted as option D.
What is Force?This is referred to as an external agent which could be in the form of push or pull and is capable of influencing the motion of an object or a body. The formula of force can be seen below:
F = ma where m is mass and a is acceleration
The engine of a car is contained in a compartment in the bonnet and has less substantial force acting on it while the remaining options are exposed to various types of forces.
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Paola can flex her legs from a bent position through a distance of 22.3 cm . Paola leaves the ground when her legs are straight, at a speed of 4.20 m/s .
Calculate the magnitude of her acceleration, assuming that it is constant.
The acceleration can be calculated using the third free fall equation. Paola will accelerate throughout flight at a rate of 39.55 m/s2.
Acceleration is a quantity that is inversely related to time taken as well as having a direct link with velocity. A vector quantity, that is.
The third free fall equation can be used to calculate Paola's acceleration.
V^2 = U^2 + 2 as
where s is the distance travelled, an is the acceleration, V is the final velocity, U is the beginning velocity, and
Given the query, the values are: s = 22.3 cm (0.223 m), U = 4.20 m/s, and V = 0.
Poala defies gravity, so as a result, we have:
0 = (4.20)² - 2(a x 0.223)
= 17.64 - 0.446a
0.446a = 17.64
a = 17.64/0.446 = 39.551
a = 39.55 m/s²
Therefore Paola's acceleration is
39.55 m/s²
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1. Reflect back on a time when you did something you later were at least somewhat uncomfortable with. Maybe it was something you said or did, but upon reflection you knew it wasn't the right thing to do. If you can't think of a real situation, you can create a hypothetical one.
The goal in the exercise is this:
1. What were your motives for doing what you did?
2. Why did you later question your own motives?
3. Reference the material used/learned in this lesson.
4. If you didn't question your motives then, question them now. Did you do the right thing in the end? If so, why, if not, why not?
2. The second part of the assignment is also two pages. In this part of the essay, you're going to question and analyze someone else's motives. They can be anybody and any situation. They can be someone you know, (please protect confidentiality and don't use actual names), or they can be a famous/public figure, (for example: why did Nixon ultimately step down from the presidency?). Proceed as follows:
1. Briefly describe the situation.
2. Analyze the situation and the person's motives for what they did using reference to the materials used/learned in this lesson.
3. Explain what you think the person could have differently to deal with the situation and why.
[tex]\pink{ \rule{2pt}{99999pt}}[/tex]
If the velocity versus time graph of an object is a horizontal line the object is
If an object's velocity versus time graph is a horizontal line the object is travelling at constant velocity which means the object is not accelerating at all.
.............................................
Explanation:
where is the questions you are asking
Find the average speed from home plate to second base in 8.2 seconds, using the 60 feet for base distance
The correct answer is 2.9 m/s.
Average speed combines two concepts into a single word: speed, which is a change in position, and average, which refers to a mean determined from many different data points.
By dividing the distance an object travels in one unit by the amount of time it takes to travel that distance, one may determine the speed of the object. The speed of the item on this voyage, denoted by the letter "s," is equal to s = D/T if "D" is the distance traveled in some time "T."
Given,
time = 6.2 seconds
distance = 60 feet
speed = distance/time
speed = 60/6.2
speed = 9.67 feet/s
speed = 2.9 m/s
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How long does it take to drive at 8 m/s for 30 km (answer in seconds)? * 3750 s 3750 min 37500 s 375 s
Answer: 3750 in seconds
1) A satellite in orbit around Earth is in uniform circular motion. What is the angle between the velocity vector and acceleration vector at any given point on the orbit?(1 point)
0º
0º
45º
45º
180º
180º
90º
2) A hammer thrower spins a hammer in a circle. What happens when the centripetal force drops to 0?(1 point)
The centripetal force cannot drop to 0.
The centripetal force cannot drop to 0.
The hammer continues in the circular motion.
The hammer continues in the circular motion.
The hammer drops straight to the ground.
The hammer drops straight to the ground.
The hammer flies off at a tangent to its circular path.
3) A bike racer follows a circular indoor track, racing at constant speed. In what direction is their acceleration, and why?(1 point)
In the direction of motion, accelerating their speed.
In the direction of motion, accelerating their speed.
Counter to the direction of motion, keeping her speed constant.
Counter to the direction of motion, keeping her speed constant.
Inward to the center of the track, the direction of the force needed to keep her on this path.
Inward to the center of the track, the direction of the force needed to keep her on this path.
Outward, the direction she would go if not constrained by the track.
4)A diagram shows the velocity vector for an object in uniform circular motion. Why is the vector tangential to the circle?(1 point)
The vector approximates the curved path at that point.
The vector approximates the curved path at that point.
The vector indicates the direction of the force on the object.
The vector indicates the direction of the force on the object.
The vector shows the path the object would follow if the net force acting on it stopped.
The vector shows the path the object would follow if the net force acting on it stopped.
The vector shows how the object pulls against the centripetal force.
5) A satellite is in uniform circular motion around the Moon. What happens to the direction of the acceleration vector during one full orbit?(1 point)
The acceleration vector always points in the direction of motion.
The acceleration vector always points in the direction of motion.
The acceleration vector always points outward.
The acceleration vector always points outward.
The acceleration vector oscillates back and forth.
The acceleration vector oscillates back and forth.
The acceleration vector always points inward.
Answer:90
Explanation: bc i looked it up
10. A 4.5 kg block is pulled across a horizontal surface that has a
coefficient of kinetic friction of 0.40. a). Draw a free-body diagram that
includes the vertical and horizontal forces. b) What is the normal force? c)
What is the force of friction exerted by the surface on the block? d). If the
block is pulled by a 25 N force, what is the net force acting on the block?
e). What is the acceleration of the block? Be sure to draw
The acceleration is 4.24 m/s² and the force of friction is 17.64.
Equation :To calculate normal force,
use formula,
F = ma
where,
F is normal force
m is mass
a is acceleration due to gravity
Given,
m = 4.5kg
a = 9.8 m/s²
F = 4.5 kg x 9.8 m/s²
F = 44.1 N
Now, as we calculate the normal force
To calculate the force of friction
Using the formula,
μ = N / F
where,
μ is coefficient of friction
N is force due to friction
F is normal force
Given,
μ = 0.40
F = 44.1 N
So, putting values,
We have,
0.40 = N / 44.1
N = 0.40 x 44.1
N = 17.64
Net force = F - Fₙ
So,
Net force = 44.1 N - 25 N
Net force = 19.1
Now we know the net force so to calculate acceleration
Using formula,
F = ma
a = F / m
a = 19.1 / 4.5
a = 4.24 m/s²
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According to FDA regulations, if a product claims to be "low calorie," it means that it must contain
100 calories or fewer per serving
150 calories or fewer per serving
200 calories or fewer per serving
40 calories or fewer per serving
Answer:D
Explanation:D
If a product claims to be low-calorie, then it means that it must contain 40 calories or fewer per saving. Hence, option D is correct.
What is Calorie?Our bodies need energy to keep us alive and to make sure that our organs are functioning properly.
When we eat and drink, we provide our bodies with energy. Our bodies consume that energy during routine tasks like breathing and jogging.
To keep a constant weight, the amount of energy we put into our bodies must correspond to the amount of energy we expend during routine biological functions and physical activity.
A key element of a balanced diet is striking a balance between the energy you put into your body and the energy you expend.
For instance, the more physical activity we do, the more energy we use.
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Which statement describes the law of conservation of energy?
Answer:
energy cannot be created or destroyed, although it can be changed from one form to another. KE + PE = constant.
Explanation:
please make my answer as brainelist
31. Divide 4.2 × 10³ m/s by 0.57 ms, and express your answer in m/s².
The acceleration of the given is a = 7.368 × 10³ m/s².
Equation :To calculate the equation we use acceleration formula,
So,
a = Δv/Δt
where,
a is acceleration
Δv is velocity
Δt is time
Now putting the values,
We get,
a = 4.2 × 10³ m/s / 0.57 s
a = 7.368 × 10³ m/s²
What is the speed-time graph acceleration formula?The particle's acceleration is represented by the gradient of the line of the speed-time graph (for straight lines acceleration is constant). Line gradient = change in velocity, time = v ut = a. Line gradient is equal to the change in velocity over time, or v u t, or a. The distance traveled by a particle is indicated by the area under the speed-time graph.
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What are five different types of objects that orbit the sun in the solar system?
a body of mass 12.0kg is placed on an orange tree 13m above the ground. .....1. calculate the potential energy .......2. if the body is released from this height what will be the kinetic energy just before it hits the ground.(g = 10 m/s)
Answer:
Given , mass = 12.0kg
height = 13m
acceleration due to gravity = 10m/s
1.ans
Potential energy = mass×acceleration due to gravity×height
Potential energy = 12kg×10m/s×13m
Potential energy = 1,560J
2.ans
Remember this when a body is above the ground potential energy is equal to kinetic energy.
Potential energy = kinetic energy
kinetic energy = ½× mass×(velocity)²
1560J = ½×12kg×v²
1560J = 6kg× v²
1560kgms-2 - 6kg = v²
v² = 1,554m/s²
K.E = ½×m×v²
K.E =( ½)(12kg)(1,554m/s²)
K.E = 9,324J
What acceleration will you give to a 28.9 kg
box if you push it with a force of 87.2 N?
Answer in units of m/s².
Answer:
acceleration = 3.02 m/s²
Explanation:
To calculate the acceleration, we can use the formula for force:
[tex]\boxed{F = ma}[/tex],
where:
F = force applied
m = mass of object
a = resultant acceleration.
We can rearrange the above formula to make acceleration (a) the subject:
[tex]a = \frac{F}{m}[/tex]
⇒ a = [tex]\frac{87.2}{28.9}[/tex]
⇒ a = 3.02 m/s²
Therefore the acceleration given to the box is 3.02 m/s².
A person 1.8 m tall is photographed with a 35-mm camera, and the film image is 20 mm. Under the same conditions, how tall is a person whose film image is 16 mm?
Under the same conditions, the height of a person whose film image is 16 mm is 1.44 m.
What is magnification of a lens?
The magnification of a lens is defined as the ratio of the height of an image to the height of an object.
The formula for magnification of a lens is given as;
M = v/u = hi/h
where;
v is image distanceu is object distance hi is image heighth is object heightUnder the same conditions, the height of a person whose film image is 16 mm is calculated as follows
M = 20 mm / 1.8 m = 16 mm/h
20 mm / 1.8 m = 16 mm/h
h = (16 mm / 20 mm) x 1.8 m
h = 1.44 m
Thus, under the same conditions, the height of a person whose film image is 16 mm is 1.44 m.
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A skateboarder starts up a 1.0-m-high, 30∘ ramp at a speed of 9.0 m/s. The skateboard wheels roll without friction. At the top, she leaves the ramp and sails through the air.
How far from the end of the ramp does the skateboarder touch down?
Express your answer with the appropriate units.
The skateboarder touches a distance of R= 7.09m from the end of the ramp.
What is velocity?Velocity can be defined as the rate of change of the object's position with respect to a frame of reference and time.
From the given instance, the skateboarder touches a distance of R= 7.09m from the end of the ramp
Velocity along y axis = 9.0 sin30 = 4.5m/s.
Velocity along x axis = 9cos30 = 7.79m/s
Vfinal -Vinitial = acceleration * time
4.5 = 10t ; t(up) = 0.45s.
Hy = 9*(sin 30°)*T1 - (1/2)*g*T1^2 [ upward movement]
Hy= 9*(1/2)*0.45 - (1/2)*9.81*0.45^2
Hy = 2.025 - 0.993
Hy = 1.032
T2 = √[(2/9.81)*1.032] = 0.46
R = (T1 + T2)*9*(cos 30°)
R= (0.45+0.46)* 9* 0.8660
R= 7.09m
In conclusion, Velocity is a vector quantity that refers to "the rate at which an object changes its position.
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Which formula describes
acceleration?
O m/s
O m²
O m/s²
O s/m
Answer:
the answer is the formula of acceleration is m/s²
An old theory about the creation of the universe has been replaced by a new theory. Which of these statements is correct about the two theories? The old theory was rejected because it could not become a law. The old theory would be again accepted by a few scientists if it becomes a law. The new theory is a valid explanation which cannot become a law. The new theory can become a law if it gets the support of the scientific community.
Answer:
A because it was rejected as it cannot become a law it was totally wrong as compared to today's information about out universe that how big bang theory was there.... So it is right the option A
PHYSICS : MODULE 01 GALILEO GARDENS : 01.02 GRAPHING DATA
Graphing Activity
Let’s take another look at the experimental data given to you in the exploratory activity. Graph the data once again, applying the knowledge and skills you have learned.
Procedure:
Table 1 shows some data that Rafael and Cristine collected during an experiment to measure the stretch of a spring as more force was applied.
Graph the data from Table 1 on your graph paper. Do not use a graphing program.
The experimental value of the expression due to gravity through the experiment will come out to be 8.41u, the error in the value has Accord because of air friction.
What is acceleration due to gravity?Acceleration due to gravity is a form of acceleration that is exercised by the gravitational pull of the earth its value is fixed at the surface n is equal to 9.8u.
What is air friction?Aries composed of molecules and their food when an object passes through air strikes the a molecules they are molecules according to Newton's third law strike back at the object therefore reducing its speed. This force by the molecule is known as air friction.
The setup of the given experiment consists of:
A bob of mass m
A stopwatch with high accuracy
An inch tape
A speedometer
Experiment is conducted in the following manner:
First the bob will be released and from the point that it is being released we will measure the distance using the inch tape we will also calculate the time it takes for the bob to hit the ground.Using the speedometer will measure the final velocity before it is the ground.Now using Newton's first law of motion we can derive the acceleration due to gravity we know the final velocity using the speedometer the distance it has covered and the time it has taken to complete that distance.Using Newton's first law of motion
i.e. v = u + a × t
Where,
u is initial velocity
v is final velocity
a is acceleration due to gravity
t is time taken to cover distance
From the data given v = 16.82m/s
t is 2 seconds
Substituting value in Newton's first law of motion we get
Value of acceleration due to the gravity = 8.41
Therefore, The experimental value of the expression due to gravity through the experiment will come out to be 8.41u, the error in the value has Accord because of air friction.
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As a 2.0-kg block travels around a 0.50-m radius circle it has an angular
speed of
12 rad/s. The circle is parallel to the xy plane and is centered on the z axis, a
distance of 0.75m from the origin. The z component of the angular
momentum
around the origin is:
The z component of the angular momentum around the origin is 9 kg-m²/s.
What is angular momentum?
Angular momentum is the property of any rotating object given by moment of inertia times angular velocity.
The z component of the angular momentum around the origin is is calculated as follows;
L = mvr
where;
m is the massv is the linear speedr is the distance from the originv = ωr
where;
ω is angular speed = 12 rad/sr is radius of the circlev = 12 rad/s x 0.5 m
v = 6 m/s
Substitute the given parameters' and solve for the z component of the angular momentum around the origin is;
L = (2 kg) x (6 m/s) x (0.75 m)
L = 9 kg-m²/s
Thus, the z component of the angular momentum around the origin is 9 kg-m²/s.
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Answer: 6.0
Explanation:
v = 0.5 * 12 = 6
l = m * r *v
l = 2 * 0.5 * 6
l= 6
what are harmful micro-organismo and what are useful micro products
Answer:
Microorganisms are used in various industries for the production of various metabolites such as ethanol, riboflavin, lactic acid, and butanol. There are a number of microorganisms that are responsible for food spoilage, diseases and infections. Such microorganisms are known as harmful microorganisms
Explanation:
An economist would like to estimate the proportion of young adults who have college debt. An online survey invites
young adults to share information about their level of college debt. Which of the following describes the survey
design and potential bias?
O This is voluntary response and is likely to overestimate the proportion of young adults with college debt.
O This is voluntary response and is likely representative of the proportion of young adults with college debt.
O This is voluntary response and is likely to underestimate the proportion of young adults with college debt.
O This is a convenience sample and is likely to overestimate the proportion of young adults with college debt.
Mark this and return
Save and Exit
Next
Submit
An economist would like to estimate the proportion of young adults who have college debt. The statement that describes the survey is option A. This is a voluntary response and is likely to overestimate the proportion of young adults with college debt.
An economist is a professional and practitioner inside the social technological know-how field of economics. The character may also observe, broaden, and observe theories and ideas from economics and write about financial coverage.
Economics majors are successful in a huge variety of careers. despite the fact that various roles in corporations are most not unusual, economics majors are a success in law, medicinal, authorities, non-profits, and worldwide members of the family, as well as in educational roles. Economists paintings in lots of fields which include academia, authority, and in the personal region, where they may additionally look at information and facts so that you can spot tendencies in financial activity, monetary self-assurance stages, and customer attitudes.
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Answer: A "This is voluntary response and is likely to overestimate the proportion of young adults with college debt."
Describe at least two gravitational forces that exist in the diagram above.
There are just two factors that matter when discussing the gravitational pull of one item on another: the mass of each object and the distance between them.
This is further explained below.
What are gravitational forces?Generally, According to Newton's global law of gravitation, the amount of force exerted by the attraction between any two bodies is directly related to the sum of their masses and inversely related to the square of the distance that separates them from one another.
In conclusion, The magnitude of the gravitational pull between two objects is proportional to the product of their respective masses and the square of the distance that separates them.
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Which of the following is NOT one of the functions of glial cells?
Select one:
O a. They provide nourishment to neurons.
O b. They help repair damage that might occur to neurons.
O c. They nourish nerve cells.
Od. They communicate messages within the nervous system.
Answer:
D they communicate messages within the nervous system.
Explanation:
just feel it's D
Answer:
The answer to this question is D. They communicate messages within the nervous system.
How much kinetic energy does a 4.50kg block with a speed of 5.00m/s have?
Answer:
56.25J
Explanation:
Kinetic energy = 1/2 x 4.50 x (5.00)^2= 1/2 x 4.50 x (5.00 x 5.00)= 1/2 x 4.50 x 25Multiply through = 112.5/2= 56.25J
You are conducting an experiment to find out whether the time a person wakes up affects his or her
mood. You have one third of your participants wake up at 6:00, another third at 7:00, and another
third at 8:00. Then you give a questionnaire to them to determine their mood.
What is the independent variable and what is the dependent variable in this experiment?
The dependent and the independent variable in this experiment is mood and time, respectively.
What are Independent and dependent variables?The Independent variables are that variables whose value does not depend on any other variable. And it causes the change in other variables.
The dependent variable is those variables whose value is not independent and change in this variable is dependent on the change of the independent variable.
Given that You are conducting an experiment to find out whether the time a person wakes up affects his or her mood. Therefore, we want to know whether the mood of a person is dependent on the time he or she wakes up or not.
Now, since mood is dependent on time, therefore, mood is the dependent variable in the experiment and time is the independent variable in the experiment.
Hence, the dependent and the independent variable in this experiment is mood and time, respectively.
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