Which statement best explains acceleration?
O A.
It is the total distance covered over a period of time.
B.
It is a change in velocity over a period of time.
Oc.
It is a change in displacement over a period of time.
OD.
It is a change in direction over a period of time.

Answers

Answer 1

Answer:

It is a change in velocity over a period of time.

Explanation:

It is measured in metres/second2 using an accelerometer.

Related Questions

Boats use echo sounders. Pulses of sound waves are reflected by the sea bed and
detected by a sensitive microphone. The time between an echo sounder sending and
receiving a pulse is 0.005 s. The device calculates the depth of the sea, using the speed
of sound in sea water, which is 1500 m/s.
Use this information to calculate the depth of the sea. Show your working.

Answers

Answer: depth = 3.75 m

Explanation:

Taken the speed of the sound in sea to be V = 1500 m/s

The time between an echo sounder sending and receiving a pulse is 0.005 s. That is,

Total time T = 0.005

Formula for echo is:

V = 2X/T

Where X = distance covered

Substitute V and T into the formula

1500 = 2X/0.005

Cross multiply

7.5 = 2X

Make X the subject of formula

X = 7.5/2

X = 3.75 m

Therefore, the depth of the sea is 3.75 m

What was Neptune's distance from the Sun in 1989?

Answers

Answer:

4.5 Billion km :)

Explanation:

thats how it is

Answer:

About 3.8 billions miles from the Sun OR 4.82 kilometers

hope this helped!

what is the equivalet tempreture of 0 kelvin in celcius scale
HELP NEED IT IN 5 MIN

Answers

Answer:

-273.15 degree celcius

Explanation:

Please Help! When drawing free-body diagrams, does the label "centripetal force" get used? Explain why.

Answers

Explanation:

No.  Centripetal force is a not a force itself, but rather a sum of forces.  From Newton's second law:

∑F = ma

∑F = m v²/r

So centripetal force does not get used on a free body diagram.

how much work must be done by frictional forces in slowing a 1000-kg car from 26.1 m/s to rest?

Answers

Answer:

Explanation:

Work done by the frictional force is 3.41x10^5 J

It is given that,

Mass of the car, m = 1000 kg

Initial velocity of car, u = 26.1 m/s

Finally, it comes to rest, v = 0

We have to find the work done by the frictional forces. Work done is equal to the change in kinetic energy as per work - energy theorem i.e.

W = −340605 J

or Hence, the correct option is (a).


A pot of water is boiled on a stove. Which of the following definitions of the system enables the most straightforward thermodynamic analysis of the process
A. The system is the pot and water.
B. The system is the stove, pot, and water.
C. The system is the building containing the stove.
D. The system is the entire Universe.​

Answers

Answer:

A. The system is the pot and water.

Explanation:

Thermodynamics is an aspect in science which deals with the applications of heat energy. The useful applications of heat energy to perform work.

In the given question, the pot and water is the system which both absorbs heat energy from the stove. Thus, the system is a closed system since it shares heat energy with its surroundings.

The surrounding of the system extends from the boundary of the pot to the universe.

Light ray A moves from air to water. Part of ray A is reflected at the air-water boundary. Which arrow in the image is the reflected ray?
E
OA. B
OB.
С
OC.
D
OD. E

Answers

Answer:

A. B

Explanation:

The image has been attached.

Reflected ray refers to the ray of light which is reflected back after striking a surface that is non-permeable.

The ray of light which is reflected before the ray touches the surface is said to the incident ray.

According to the given image, ray B is the reflected ray. Ray B is reflected in the air after the ray A strikes at the surface of the water.

B

Explanation:

Since mirrors reflect things, when you shine light at a mirror, it will bounce off of the mirror, or reflect, and shine the opposite direction of where the original light is pointed. The answer would be B because light doesn't go through the mirror, or run along it.

Think of when you through a basketball on the ground. If you bounce it at an angle, it won't just come back to you in the same angle. It will keep bouncing at the same angle you through it. This is pretty much what describes the relationship between ray A and ray B.

HOPE THIS HELPS!!!!!

A helicopter travels west at 80 mph. It is moving above a car traveling on a highway at 80 mph. Given this information, you can determine that the helicopter and car are traveling ____.

Select one:

a. in the same direction

b. in different directions

c. at the same speed

d. at the same velocity

Answers

Answer:

d. at the same velocity

Explanation:

I will assume the car is also travelling westward because it was stated that the helicopter was moving above the car. In that case, it depends where the observer is. If the observer is in the car, the helicopter would look like it is standing still ( because both objects have the same velocity). If the observer is on the side of the road, both objects would be travelling at the same velocity. Also recall that, velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes but speed is the rate at which object covers distance and it is not direction wise. Hence velocity is the best option.

Answer:

C. At the same speed

Explanation:

I just took the exam and got the answer correct

What is general relativity

Answers

General relativity is a theory of space and time. The theory was published by Albert Einstein in 1915. The central idea of general relativity is that space and time are two aspects of spacetime. Spacetime is curved when there is gravity, matter, energy, and momentum.

Liquefication occurs when

Answers

Answer: Liquefaction occurs when the structure of a loose, saturated sand breaks down due to some rapidly applied loading.

As the structure breaks down, the loosely-packed individual soil particles attempt to move into a denser configuration. Liquefaction most often occurs when three conditions are met:

loose, granular sediment or fill

saturation by groundwater

strong shaking

Answer:

heat is applied

Explanation:with metal and ice

What force is required to give an object with mass 2000 kg an acceleration of
3.5 m/s2?
A. 571 N
B. 7000N
C. 10,500 N
D. 2535 N

Answers

Answer:

B

Explanation:

7,000N because the formula for finding force is F=MA (2000x3.5)N=7000N

Help needed.
(1) A small object carrying a charge of
[tex] - 5 \times {10}^{ - 9} \: c[/tex]
experiences a downward force of 10 Newton when placed at a certain point in an electric field

What is the electric intensity at that point.

2. Determine the electric potential due to a charge of
[tex]12 \times {10}^{ - 9} c[/tex]
at a point 6 cm from the charge.

3. A series arrangement of three capacitors of value at 8micro Farahds, 12 micro Farahds and 24 micro Farahds is connected in series with a 90—V battery
(a) Draw and open circuit diagram for this arrangement (b). Calculate the effective capacitance in the circuit

(c) On closed circuit calculate the charge on each capacitor when fully charged
(d) Determine the PD across the 8 micro Farahds capacitors.​

Answers

Answer:

1. -2×10 ^-9

2. 1800v

3 (ii) 4micro Farhad

(iii) V = 3.60 ×10²

(Iv) 45v

Explanation:

I hope it helps

4. How does a molecule differ from an atom? (4 points)

Answers

A molecule is two or more atoms held together by covalent bonds.
An atom is the smallest part of an element.

Question 10 of 10
2 Points
Which of the following best describes how the Federal Reserve Bank helps
banks during a bank run?
A. The Federal Reserve Bank acts as an insurance company that
pays customers if their bank fails.
B. The Federal Reserve Bank regulates exchanges to prevent the
demand for withdrawals from rising above the required reserve
ratio.
C. The Federal Reserve Bank has the power to take over a private
bank if customers demand too many withdrawals.
D. The Federal Reserve Bank can provide a short-term loan to banks
to prevent them from running out of money.

Answers

Answer:

D. The Federal Reserve Bank can provide a short-term loan to banks

to prevent them from running out of money.

Explanation:

A bank run occurs when a large number of depositors withdraw their deposits simultaneously from a bank.

As the number of withdraws increases, the available cash in the bank decreases until a point that the bank can't give depositors their money.

In these situations, The Federal Reserve Bank acts as a lender of last resort that helps to reinforce the effect of deposit insurance, and to reassure bank customers that they will not lose their money.

Please help me answer this question! Will appreciate help very much. a) Draw a circuit to show 3 lights in series b) Draw a circuit to show 2 lights in parallel c) Draw a circuit that shows 2 lights in parallel which are both in series with a third light. d) What would happen to the 2 other lights if the third light in question c) fails

Answers

Answer:

C kind sir

Explanation:

Calculate the wavelength of a nitrogen molecule moving at a speed of 523m/s.

Answers

Answer:

The de-Broglie wavelength of the nitrogen molecule is 0.0272 nm

Explanation:

The mass, m, of the nitrogen molecule, N₂ = 14.0076u = 28.0152 × 1.66 × 10⁻²⁷ kg

[tex]v_{rms}[/tex] of N₂ = 523 m/s

The de-Broglie wavelength is given as follows;

[tex]de-Broglie \, wavelength = \dfrac{h}{m\times v_{rms}}[/tex]

Where:

h = Planck's constant = 6.62607004 × 10⁻³⁴ m²·kg/s

Plugging in the values, we have;

[tex]de-Broglie \, wavelength = \dfrac{6.62607004 \times 10^{-34}}{28.0152 \times 1.66 \times 10^{-27}\times 523} = 2.72\times 10^{-11} \, m[/tex]

Hence, the de-Broglie wavelength of the nitrogen molecule = 0.0272 nm.

1. Of the following, the one that is not an example of a suspension is
a. Milk
b. Milk of magnesia
c. Sand in water
d. Sugar in water


2. The word used to represent a chemical reaction is a/an
a. Atom
b. Formula
c. Equation
d. Symbol


3. When two similarly charged objects are brought close together, they
a. Repel each other
b. Have no effect on each other
c. Stick to each other
d. Attract each other


4. An element common to all acids is
a. Chlorine
b. Hydrogen
c. Nitrogen
d. Oxygen


5. Atoms of the same element that differ slightly in mass are called
a. Ions
b. Isotopes
c. Neutrons
d. Positrons


6. In general, salts
a. Contain hydroxide ions
b. Contain hydrogen ions
c. Are ionic compounds
d. Turn blue litmus red.


7. A dye used to test the acidity of a substance is
a. Litmus
b. Magnesium sulfate
c. Sodium chloride
d. Sodium hydroxide


8. The central portion of an atom is called the
a. Electron
b. Nucleus
c. Ring
d. Shell


9. Sugar is poured into a glass of water and stirred. In this example the sugar is the
a. Solution
b. Solvent
c. Solute
d. Alcohol


10. Which of the following is characterized by a sour taste?
a. Bases
b. Acids
c. Salts
d. Compounds


11. Which of the following is characterized by a bitter taste and turn lithmus blue?
a. Bases
b. Acids
c. Compounds
d. Elements


12. The force of gravity on an object is called
a. Density
b. Mass
c. Volume
d. Weight


13. The liquid referred to as the “universal solvent” is
a. Alcohol.
b. Benzene.
c. Oil.
d. Water.


14. A statement that proposes a cause-and-effect relationship between two variables is called:
a. Conclusion.
b. Fair test.
c. Hypothesis.
d. Theory


15. Any substance that has mass and occupies space is called
a. A gas
b. A liquid
c. Matter
d. A solid


16. When the numbers of electrons and protons in a sample of matter are equal, the matter is
a. Insulated.
b. Negatively charged.
c. Neutral.
d. Positively charged.


17. Which of the following is most important when judging the quality of a scientific theory?
a. The quality and reliability of data that support the theory
b. The amount of detail provided in the theory
c. How recently the theory has been published
d. The respectability of the scientists setting forth the theory


18. Substances that cannot be decomposed to any simpler substances are called
a. Compounds.
b. Elements.
c. Mixtures.
d. None of the above.


19. When the air in a bell jar containing a ringing bell is removed, the sound decreases because
a. The removal of the air prevents electric current from flowing
b. Sound cannot travel through the air
c. Sound cannot travel through glass
d. Sound cannot travel in a vacuum


20. An element common to all acids is
a. Chlorine.
b. Oxygen.
c. Nitrogen.
d. Hydrogen.


21. The amount of matter in an object is best expressed by its
a. Density
b. Mass
c. Volume
d. Weight


22. A substance that increases the rate of a reaction is a
a. Liquid
b. Gas
c. Catalyst
d. Solid

Answers

Answer: 1. C

Explanation: 2. C

which type of circuit is shown?

A. closed series circuit
B. closed parallel circuit
C. open parallel circuit
D. open series circuit​

Answers

Answer:

I think it's D. open series circuit .

Explanation:

hope it helps you!

Why is a device never 100% efficient? *


a) Mechanical Advantage

b) Work

c) Friction

d) Speed Ratio


brainliest for best answer, asap plz
for science lovers!!

Answers

I think it’s c, friction
I’m not sure tho

Help.
Why do scientists believe that global warming is happening?

Answers

Because scientists have been noticing changes in the atmosphere

describe what factors can make it difficult to reintroduce captive animals into their natural habitats.

Answers

Answer:

Captive animals are animals that are maintained by people in an enclosed place not allowing them to be free. There are several factors that make it difficult to reintroduce them to their natural habitats like:

-Captive animals don't learn the necessary skills to survive in their natural habitats like hunting skills.

-They are too used to have contact with people which makes them vulnerable to hunters.

-Sometimes these animals are not able to integrate with a wild population.

-It has been found that some captive animals are more susceptible to diseases.

Which graph shows the correct relationship between kinetic energy and speed?

Answers

Answer: D

Explanation:

Kinetic energy = 1/2mV^2

From the formula above, we can deduce that kinetic energy is proportional to the square of speed. That is,

K.E = V^2

Graphically, the relationship isn't linear but a positive exponential. Therefore, option D is the correct answer.

Answer:

The correct answer is D.

Explanation:

Hope this helps.

Which of the following statements best describes the second law of
thermodynamics?
A. Heat flows spontaneously from hot to cold, and entropy
decreases.
B. Heat flows spontaneously from hot to cold, and entropy increases.
C. Heat flows spontaneously from cold to hot, and entropy increases.
D. Heat flows spontaneously from cold to hot, and entropy
decreases.

Answers

Answer:

B

Explanation:

Heat flows from hot to cold to lower the temperature of hot areas and increase temperature of cold areas. The end result is that the 2 areas have the same temperature, thus increasing entropy.

Heat flows spontaneously from hot to cold, and entropy increases.

The second law of thermodynamics relates to the entropy of a system. According to the second law of thermodynamics, the total entropy of a system may increase or remain constant in a spontaneous process.

The implication of this is that the entropy of a system never decreases. The entropy of a system increases when heat flows from a hot to a cold body and not vice versa.

Hence, the statement that; "Heat flows spontaneously from hot to cold, and entropy increases" describes the second law of thermodynamics.

how does the direction of acceleration compare with the direction of the net force that produces it

Answers

Answer:

Explanation:

The direction of the acceleration is in the same direction as the net force causing it.  F = ma is actually a vector equation in which f and a are both vectors and m is a scalar constant.

An object with a mass of 120 kilograms is moving at a velocity of 30m/s what’s its momentum

Answers

Explanation:

Momentum = mass × velocity

p = mv

p = (120 kg) (30 m/s)

p = 3600 kg m/s

Given:

velocity, v = 30m/s

mass, m = 120kg

Therefore, momentum

p = mv

p = 120kg * 30m/s

p = 3600 kgm/s = [tex]3.6 * 10^3 kgms^{-1}[/tex]

What is a simple definition of momentum?

A property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity broadly.

What is momentum used for in physics?

Momentum is a vector quantity, it has both magnitude and direction. Since momentum has a direction, it can be used to predict the resulting direction and speed of motion of objects after they collide.

Learn more about Momentum here

https://brainly.com/question/904448

#SPJ2

What is the velocity of the objects position vs time graph

Answers

Answer: In a position-time graph, the velocity of the moving object is represented by the slope, or steepness, of the graph line. If the graph line is horizontal, like the line after time = 5 seconds in Graph 2 in the Figure below, then the slope is zero and so is the velocity. The position of the object is not changing

The temp of equal masses of three different liquids A,BandC are 12°C,19°Cand 28°Crespectively . The temp when A and B are mixed is 16°C, and when Band C are mixed is 23°C.The temp when A and C are mixed is

Answers

Answer:

19.1°C

Explanation:

If A and B mix to give 16°C, A has risen by 4°C and B has fallen by 3°C;

If B and C mix to give 23°C, B has risen by 3°C and C has fallen by 5°C;

This means the energy transfered to cause a change of 3°C in B causes a change of 4°C in A and 5°C in C;

We can use this as a ratio (4:5);

The temperature difference between A and C is 16°C;

we add the two parts of the ratio (4+5) to get 9 and divide the temperature difference to get 16/9;

Next we multiply this by one of the parts of the ratio, so with 4, you get 64/9;

This number is the proportional temperature change in A upon mixing;

We then add this to the original temperature of A to get the resultant temperature of the mix like so:

64/9 + 12 = 19.1111...

You can do this alternatively using the other part of the ratio;

We would multiply the 16/9 by the 5 instead of the 4 to get 80/9;

This number is the proportional change in temperature in C upon mixing

Then subtract this from this from the original temperature of C and you should get the same answer:

28 - 80/9 = 19.1111...

Which of the following is an example of a visual aid? A. a poster B. a pair of glasses C. a set of note cards D. a copy of a written report

Answers

Answer:

a pair of glasses

of course

Actually a visual aid when talking about a project is something that the audience would look at to help enhance your presentation, so it would be A) a poster

____ charges are attract each other

Answers

Answer:

One positive and one negative

a + and - charge are attracted


Do you think a population besides the moon jellies’ consumer population (sea turtles) and resource population (zooplankton) could have caused the moon jelly population to increase in size?

Answers

Answer:

I didn't quite understand your question, but the moon jelly population will increase if there are either more zooplankton or less sea turtles.

More zooplankton means more food => higher population

Less sea turtles means that the moon jelly will be lest often consumed => higher population

Answer: Yes because the Orca will start to eat the moon jellies

Explanation: When the Sea Turtles start to get very low on population the Moon jellies are next in line also the sea turtles eat the moon jellies and since they eat the moon jellies the sea turtle has a bit of that taste in them so they will taste alike to the sea turtles.

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The mileages of cars in a fleet of cars are normally distributed with a mean mileage of 52,000 miles and a standard deviation of 2,000 miles. What is the probability of randomly selecting a car with a mileage less than 52,000 miles? At 5:00 p.m., Antonio turned on the oven. While the oven preheated, the temperature in the oven increased from 72F to 400F over a 10-minute period. The oven remained at 400F for 45 minutes until Antonio turned it off. It took 60 minutes for the temperature in the oven to cool, returning to 72F at 6:55 p.m. Which statement best explains whether or not the temperature in the oven is a function of the time?A. It is a function because at any given time the oven was exactly one temperature.B. It is a function because the oven temperature was the same at different times.C. It is not a function because at any given time the oven was exactly one temperature.D. It is not a function because the oven temperature was the same at different times. The amount of energy associated with a production of bottled water is approximately Normal with a mean of 8.7 million Joules and a standard deviation 0.5 million Joules. How much energy should be required for the bottom 80% of bottled water? When a fuse blowsCheck all that applyO A it's a sign that there might be something causing too muchcurrent to flow in the circuitO B it is best to replace it with a much larger fuseo you should replace the fuse and check to see what might havecaused it to blowO the circuit catches fire If you put all of the bean sprouts together end to end whatwould be the total length of all the objects?inches M is directly proportional to r cubed when r = 4 m = 160 work out the value of r when m = 540 Daisy has 1/8 tank of gas remaining when she pulls into a gas station. After she puts 15 gallons of gas in her car, the gas gauge reads 3/4 full. How many gallons of gas does Daisys tank hold?*Please Show Work* Match each word with the phrase that best defines it Which of the following issues postponed ratification of theArticles of Confederation?Apower of taxationownership of western landsC slaveryD representation of states in Congress What is the theme of a story? 100 PTS! An orange is shot up into the air with a catapult. The function h given byh(t) = 15 + 60t 16t2 models the orange's height, in feet, 1 seconds after it waslaunched.Question 5 What is the initial speed at which the orange is shot in the air? Which of the following statements explains one ofthe reasons Thoreau opposed the Mexican-American War?O He believed that the war would eliminateslavery in the United States.He believed that the war was fought to addmore slave states to the United States.He believed that the war would take the livesof his fellow citizens.O I NEED HELP PLEASE, THANKS SO MUCH! :)Solids, liquids and gases are the three most commonly accepted phases of matter. Explain the properties of each phase, including their relative energy. I need help with this questions Purple Taxi has no pick-up fee, but charges $0.25 per mile. ABC Taxi charges $3 for pick-up and $0.15 per mile. Which inequality can be used to find the number of miles, n, for which the cost of a cab ride with Purple Taxi exceeds the cost of a cab ride with ABC Taxi? 0.25n3+0.15n 0.25n+30.15n+3 3+0.15n>0.25n 4. If 175 undecayed nuclei remain from a sample of 2800 nuclei, how many half-lives have passed? (Show your work.) *Your answer Plz help me with this question The type of energy transferred by a wave in a medium is kinetic energy. explain how the voice of the people can be heard within a government that is divided into 3 branches The null and alternative hypotheses for a hypothesis test of the difference in two population means are: Alternative Hypothesis: p1 > p2 Null Hypothesis: Hi = uz Notice that the alternative hypothesis is a one-tailed test. Suppose proportions_ztest method from statsmodels is used to perform the test and the output is (3.25, 0.o43). What is the P-value for this hypothesis test? A. 0.00215 B. 0.0043 C. 3.25 D. -3.25