A shopping cart rolls from x=19.9m to x=5.40m with an average velocity of -0.418m/s. How much time did it take? (unit=s)

As per the question there are two physical quantities i.e scalar quantity and vector quantity.

A scalar is a physical quantity which requires only magnitude.It does not require any direction for it's complete specification.For instance we may take distance travelled,speed etc.

Unlike a scalar quantity,a vector quantity requires both magnitude as well as direction for it's complete specifications.For instance we may take displacement which is the shortest distance between two points,the velocity which is the speed in a given direction.

Hence a vector and scalar is differentiated by direction.

As per the question,the correct option will be the third option i.e C.

Carlita is right.As per her, both vector and scalar have magnitude,but only vectors have direction which is also true.

#2

As it is given here

initial speed is

[tex]v_i = 6 m/s[/tex]

After 4 seconds the final speed is

[tex]v_f = 14 m/s[/tex]

so here we can use the formula of acceleration using kinematics

[tex]a = \frac{v_f - v_i}{t}[/tex]

[tex]a = \frac{14 - 6}{4}[/tex]

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

so here it will accelerate at 2 m/s^2 rate.

#3

As it is given here

initial it starts from rest

[tex]v_i = 0 m/s[/tex]

After 2.5 seconds the final speed is

[tex]v_f = 15 m/s[/tex]

so here we can use the formula of acceleration using kinematics

[tex]a = \frac{v_f - v_i}{t}[/tex]

[tex]a = \frac{15 - 0}{2.5}[/tex]

[tex]a = 6 m/s^2[/tex]

so here it will accelerate at 6 m/s^2 rate.

#4

i think question is not correct as in first line it is saying about a bag of trash and then in next line it is asking for the position of Jumper and bridge.

Given:

(Initial velocity)u=20 m/s

At the maximum height the final velocity of the ball is 0.

Also since it is a free falling object the acceleration acting on the ball is due to gravity g.

Thus a=- 9.8 m/s^2

Now consider the equation

v^2-u^2= 2as

Where v is the final velocity which is measured in m/s

Where u is the initial velocity which is measured in m/s

a is the acceleration due to gravity measured in m/s^2

s is the displacement of the ball in this case it is the maximum height attained by the ball which is measured in m.

Substituting the given values in the above formula we get

0-(20x20)= 2 x- 9.8 x s

s= 400/19.6= 20.41m

Thus the maximum height attained is 20.41 m by the ball

Answer:

 Option B

Explanation:

The instantaneous velocity = Change in position/Time taken

The slope of the graph should give instantaneous velocity.

 Slope of a graph = Change in value of Y -axis / Change in values of X -axis

 Comparing both the equations

   Change in value of Y -axis = Change in position

  Change in values of X -axis = Time taken

So position values should be on the Y axis and Time values should be on the X axis.

Distance on the y-axis and time on the x-axis.

So, option B is the correct answer.

Answer:

A

Explanation:

slope is calculated using rise over run

Displacement = distance and direction from start-point to end-point.

That's 10km south.

Velocity = displacement / time

That's 6.67... km/hr south.

The motion of the rock is a free-fall motion, which is a uniformly accelerated motion with constant acceleration [tex]g=9.8 m/s^2[/tex] downward, so the distance covered by the rock in a time t can be found by using the formula

[tex]S=\frac{1}{2} gt^2[/tex]

By substituting t=3 s into the formula, we find the distance the rock travels after falling for 3 seconds:

[tex]S=\frac{1}{2} (9.8 m/s^2)(3 s)^2=44.1 m[/tex]

Here since we know that

[tex]t_{BA} = t_{AB}[/tex]

this equation shows that there is no air resistance

so in that case the time taken by the object during it's accent must be equal to the time taken by object during decent

so if we are given that during the upward motion object passes the two points A and B then its change in speed is given as

[tex]\Delta v_{up} = v'_B - v'_A[/tex]

similarly if we take its downward motion then in that case

it will take same time to move through the two points

so we will have

[tex]\Delta v = a \Delta t[/tex]

so here we will have

[tex]\Delta v_{up} = \Delta v_{down}[/tex]

#2

speed of bird = 31 m/s

time = 13 s

since here bird maintains its speed to be constant

so here the distance traveled is given by

[tex]d = v*t[/tex]

[tex]d = 31 * 13 [/tex]

[tex]d = 403 m[/tex]

so bird will travel 403 m distance while maintaining its speed to be constant

#3

average speed is the ratio of total distance covered and total time

here Ian walk 2 km then 0.5 km and then 2.5 km so the total distance is given as

[tex]d = d_1 + d_2 + d_3[/tex]

[tex]d = 2 + 0.5 + 2.5[/tex]

[tex]d = 5 km[/tex]

total time of his full motion is

[tex]t = 3 hours[/tex]

so the average speed of the motion is

[tex]v = \frac{d}{t}[/tex]

[tex]v = \frac{5}{3} = 1.67 km/h[/tex]

so here average speed of Ian is 1.67 km/h

#4

Initial speed of the truck is 6 m/s

after 4 s interval of time

final speed of the truck is 14 m/s

so the acceleration is rate of change in velocity

so it is given as

[tex]a = \frac{v_f - v_i}{t}[/tex]

[tex]a = \frac{14 - 6}{4}[/tex]

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

so here truck accelerated with 2 m/s^2

#5

Here car starts from rest so its initial speed is 0

after 2.5 s interval of time

final speed of the car is 15 m/s

so the acceleration is rate of change in velocity

so it is given as

[tex]a = \frac{v_f - v_i}{t}[/tex]

[tex]a = \frac{15 - 0}{2.5}[/tex]

[tex]a = 6 m/s^2[/tex]

so here car accelerated with 6 m/s^2

#6

a bag full of trash is dropped from the balcony

Here we can say when bag is in air

the net force on the bag is only due to its weight

so here we can use Newton's II law to find the acceleration of bag

[tex]F = ma[/tex]

[tex]mg = ma[/tex]

[tex]a = g = 9.8 m/s^2[/tex]

so here bag will have constant acceleration during its whole motion as we can see that there is no change in the force and hence its acceleration always remains constant

As we have four different equipment then for house hold system we know the default power of all

Coffee maker = 1400 W

Vacuum Cleaner = 700 W

Toaster = 1800 W

Electric Drill = 1000 W

now the energy consumed will be given as

[tex] Energy = Power * time[/tex]

here time is same for all that is for 1 hour we used all components

so here maximum energy will be consumed by the component which will have maximum power

So answer must be Toaster which is having maximum power of 1800 W

Jason should place the regions in:

C) Label 1: X

Label 2: Z

Answer: C) Label 1: X

Label 2: Z

Explanation: Conductors are those substances which conduct electrical current easily because of the presence of free electrons whereas Insulators do not conduct electrical current as they do not contain free electrons. Some common  examples of conductors are copper, aluminum, gold, and silver. Some common examples of insulators are glass, air, plastic, rubber, and wood.

Label 1: Lacks free electrons  must be placed in the area marked X as they correspond to insulators.

Label 2: Aluminum is an example of conductor and thus must be labelled in area marked by Z.

Area Y corresponds to semiconductors which have properties intermediate to conductors and insulators.

William Stern developed the concept of the Intelligence Quotient (IQ), which uses the mental age to chronological age ratio, influencing modern intelligence testing. The question mistakenly associates Stern with Robert Sternberg, known for his triarchic theory of intelligence, encompassing analytical, creative, and practical aspects. Stern's IQ concept focused on quantitative measure, while Sternberg's theory provided a broader perspective on intelligence.

Stern's work greatly influenced the field of intelligence testing. In 1912, he published The Psychological Methods of Intelligence Testing, which proposed a new method to score intelligence tests by calculating the ratio of mental age to chronological age, with the result multiplied by 100 to eliminate decimals. This scoring method became the foundation of the modern IQ test.

Although the question references the theories of multiple intelligences advocated by Robert Sternberg, it is important to clarify that Robert Sternberg and William Stern are different individuals. Robert Sternberg is known for his triarchic theory of intelligence, which suggests that intelligence is comprised of three parts: analytical intelligence, creative intelligence, and practical intelligence. This theory was developed as a counterpoint to traditional intelligence tests, which Sternberg argued assess only analytical intelligence and do not provide a comprehensive measure of an individual's intelligence.

Prior to Sternberg's work, the concept of IQ developed by Stern had already started to shape the way psychologists understood and measured intelligence. While Stern helped pave the path for quantitative measurement of intelligence, Sternberg expanded the concept to include different aspects beyond analytical abilities, such as creativity and practical skills.

Answer:

Static Equilibrium

Answer:

D. Static equilibrium

Explanation:

If we imagine the rectangular pool to have a length L and a breadth b, the attached figure shows one of the several possible coordinate systems that can be used to locate the position of the girl at any point of time, thus enabling us to describe her motion.

Final answer:

A suitable coordinate system to describe a girl swimming across a rectangular pool is to use the long side as the x-axis and the short side as the y-axis. One can treat the swimmer's path as two-dimensional motion, analyzing her velocities in both x and y directions separately to predict her speed and swimming time.

Explanation:

To describe the motion of a girl swimming across a rectangular pool, we could set up a coordinate system by choosing the long side of the pool as the x-axis and the short side as the y-axis, with the origin (0,0) placed at one corner of the pool. If we observe the motion from above, we can treat the swimmer's path as two-dimensional motion.

In our coordinate system, the swimmer's position (x,y) changes over time as she swims across the pool. Since the pool is a controlled environment with no external forces like wind or currents, we can assume there's no acceleration in the horizontal x-direction (ax = 0). The swimmer might push off from one side of the pool to begin moving, in which case her initial horizontal velocity (Vx) could be constant throughout her swim if she maintains a steady pace.

To analyze the swimmer's motion, we would separately consider her velocity in the x-direction (Vx = v cos θ) and y-direction (Uy = v sin θ), where v is the magnitude of her velocity and θ is its direction relative to the x-axis. By mapping her position over time, we could use kinematic equations to predict her motion, such as her speed and the time taken to swim across the pool.

Hello.

The answer is: D. wavelength

This is correct because   frequency x wavelength = speed

Have a nice day

Answer:

d. wavelength

Explanation:

The velocity of a wave is product of its wavelength and frequency. Frequency refers to the vibrations per second and wavelength is the distance between two successive troughs(highest point of wave) or crests(lowest point of wave). Since frequency is already given we need wavelength of the wave to find out its velocity. The velocity is independent of its amplitude (intensity).

Since hornet is revolving with frequency 1 round per second

Time period of hornet is given by

[tex]T = 1 s[/tex]

Also the diameter of the circular path is 12 cm

so here we can say that its constant speed will be given as

[tex]v = \frac{2 \pi r}{T}[/tex]

[tex]v = \frac{2\pi * 0.06}{1}[/tex]

[tex]v = 0.377 m/s[/tex]

now the centripetal acceleration of the hornet is given as

[tex]a_c = \frac{v^2}{R}[/tex]

[tex]a_c = \frac{0.377^2}{0.06}[/tex]

[tex]a_c = 2.37 m/s^2[/tex]

so it will have its centripetal acceleration towards the pop as 2.37 m/s^2

so the force on its wing has two components one is towards the pop which will give the hornet centripetal acceleration while other component will counter balance the weight of the hornet

Answer:

down and backward

Chemical properties are based on the ability or inability of the substance to produce new substances. Copper's malleability, color, luster, and thermal and electrical conductivity are contrasted with its ability to react with concentrated nitric acid and silver nitrate.  Copper has a melting point of 1083.4 +/- 0.2°C, boiling point of 2567°C, specific gravity of 8.96 (20°C)

so its D

question answered by

(jacemorris04)

A chemical property of copper is its reactivity. The correct option is B

Chemical interactions or chemical transformations are described by a substance's chemical properties. The term "reactivity" describes a substance's capacity to interact chemically with other chemicals, such as acids or oxygen. For instance, copper can react with some acids to produce copper salts and with oxygen to produce copper oxide, which is why it eventually takes on a distinctive green patina when exposed to air.

Therefore, The correct option is B. A chemical property of copper is its reactivity.

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Answer:

They are driving at the speed of 30 km/h

Explanation:

From the graph it is clear that,

Total distance covered by Ben and Jerry, d = 60 km

The distance of 60 km is covered in 2 hours.

We have to find how fast they drive on their way to the store i.e their speed. We know that,

[tex]speed=\dfrac{distance}{time}[/tex]

[tex]s=\dfrac{60\ km}{2\ h}[/tex]

[tex]s=30\ km/h[/tex]

Hence, the correct option is (B) " 30 km/h ".

Answer: B - Sphere A is negative and sphere B is positive because electrons from sphere B are attracted to the rod and move to sphere A.

Explanation:

The rod is positively charged which means that it will repel positive charges (protons) and the rod will attract negative charges (electrons)

If you look at all the options that are given each one of them has a flaw, lets look at them one by one for better understanding of the concept:  

(A) Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B.  

      -Incorrect because protons which carry a positive charge CANNOT be    attracted by the rod because as by the diagram the rod is also positively charged  

(C) Sphere A is positive and sphere B is negative because electrons from the rod move to sphere B and protons then move to sphere A.’

Incorrect because sphere B has protons and not electrons as we can see it in the diagram given below.

(D) Sphere A is positive and sphere B is negative because protons move from sphere B to the rod and also to sphere A.

Incorrect because protons cannot move from sphere B to the rod since the rod is positively charged and like charges always repel.

if your on edge its b fam! just took the unit test

The diagram shows three plates with different densities and their movements correspond to various geological features such as islands, trenches, rift valleys, and volcanoes/mountains.

The diagram shows three plates, A, B, and C, with Plate B being denser than Plates A and C. The features on the map are as follows:

The movements of the plates account for these features as follows:

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Answer : a. Community

Allows a system to be accessible by a group of organizations. It can be shared between several organizations. It may be managed by organizations or by the third party.

This should be chosen by Ryan, since this computing model is cost effective and best to share among companies and organizations.

Other options explained:

-Software model is accessible via a browser and multiple users can use it.

-Infrastructure model is based on providing services of computer architecture in a virtual environment

Answer:

Explanation:

The gas is in a rigid container: this means that its volume remains constant. Therefore, we can use Gay-Lussac law, which states that for a gas at constant volume, the pressure is directly proportional to the temperature. The law can be written as follows:

[tex]\frac{P_1}{T_1} = \frac{P_2}{T_2}[/tex]

Where P1=5 atm is the initial pressure, T1=254.5 K is the initial temperature, P2 is the new pressure and T2=101.8 K is the new temperature. Re-arranging the equation and using the data of the problem, we can find P2:

[tex]P_2 = T_2 \frac{P_1}{T_1}=(101.8 K) \frac{5 atm}{254.5 K}=2 atm[/tex]

So, the new pressure is 2 atm.

Using Gay-Lussac's Law, which states that the pressure and temperature of a gas are directly proportional if volume is constant, we find that the new pressure after the temperature is decreased to 101.8 k is approximately 2 atm.

To solve this problem, we use Gay-Lussac's Law, which states that the pressure of a gas is directly proportional to its temperature in Kelvin if volume is kept constant. Thus, if temperature decreases, pressure should also decrease proportionally.

The formula for Gay-Lussac's Law is P1/T1 = P2/T2, where P1 is the initial pressure, T1 is the initial temperature, P2 is the final pressure, and T2 is the final temperature.

Substitute the given values into the equation: 5 atm/254.5 k = P2/101.8 k. After cross multiplying and solving for P2, the new pressure is found to be approximately 2 atm.

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Answer:

The answer is B. Chemical changes always produce new substances.

Explanation:

In physical changes the appearance of substances is altered but not their nature, that is, the substances remain the same. In chemical changes a substance is transformed into new substances with different properties. Therefore the correct option is B. Chemical changes always produce new substances.

Answer:

The net force acting on the car is 3 N.

(d) is correct option.

Explanation:

Given that,

Force = 4 N to the right

Friction force = 1 N to the left

We need to calculate the net force acting on the car

According to the question,

When a toy car is pushed across the floor with a force then the normal force applied to the right and the frictional force applied to the left on the car.

Then, the net force = normal force - frictional force

Using formula of net force

[tex]F_{net}=F-F_{k}[/tex]

[tex]F_{net}=4-1[/tex]

[tex]F_{net}=3\ N[/tex]

Hence, The net force acting on the car is 3 N.

The golf ball will travel in a straight path unless changed by an external force.

Every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

Hope you do well:)

kinetic energy is the answer

As Jose develops a sense of industry, he will feel confident in his abilities to achieve goals. According to Erikson's theory, there are 8 stage of psychological development of a human being. A child learn different ability in each stage of life. These 8 stage are:

So, between the age 5-12, a child possess stage of Industry vs. Inferiority. Industry means Competency or Successful in Skills. In contrary, Inferiority results due to failures. If a child is guided and encourage to learn, and praised by people, they develop a sense of pride or industry. But, if a child is not encourage or promote at this stage, a sense of inferiority develops.

The best answer is B. If you curve them away, they have a less tendency to be attracted to the pair of charges and would stay around the pair instead of interacting with them.

Answer:

b

Explanation:

--------- 5.5 billion years

The answer to your question is,

1, 2, and 3.

-Mabel <3