If a boat goes from 30 km/h to 50 km/h over the next 4 h, what is its acceleration? 30-50/4

Answers

Answer 1

Acceleration = (change in speed) divided by (time for the change)

Change in speed = (50 km/h)-(30 km/h)

Change in speed = 20 km/h

Acceleration = (20 km/h) / (4 h)

Acceleration = 5 km per hour-squared


Related Questions

How can the force of friction between two surfaces be reduced?
a. By changing rolling friction to sliding friction.
b. By making smooth surfaces rougher.
c. By separating surfaces with a lubricant.
d By increasing the force between the surfaces.

Answers

B if you make it rougher they won’t be able to have frictions
C because it will reduce the friction and help the object work together

A country is experiencing economic problems. Many people are unemployed,
and businesses have been making risky investments. The government
decides to start more programs to help poor citizens find jobs, and to regulate
corporate behavior.
This situation best reflects the influence of which economic thinker?

Answers

This situation best reflects the influence of which economic thinker is John Maynard Keynes

The following information should be considered:

Keynes's theory was increased in the government expenditures and lower the taxes that stimulated demand.Also, it should pull the economy out of a depression.

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which element is loacted in group 17 period 6

Answers

i really hope this helps
I didnt exactly know so i searched it up to be sure and its goes from fluorine through astatine

A compound is formed when a sulfur atom and six fluorine atoms share electrons. What is the name of the compound? A. sulfur (I) fluoride B. sulfurous fluoride C. sulfuric heptafluoride D. sulfur hexafluoride

Answers

Answer:

D. Sulfur hexafluoride.

Explanation:

hey can anyone help me out in dis pls

Answers

Answer:

All of the above

Explanation:

Solids have a fixed shape and volume.

Even though the molecules in a solid are vibrating, they can't travel from one part of the solid to the other.

I hope this helps! :)

"Suppose an elephant (Tiny) was
pacing back and forth at the zoo.
She first goes 8 meters to the
left, 6 meters to the right, and 2
meters to the left.
What is the total distance Tiny
has traveled?
I
What is Tiny's displacement?

Answers

Answer :

Distance traveled by Tiny : 8m + 6m + 2m = 16 meters
Displacement of Tiny : 8m (left) - 6m (right) + 2m (left) = 4 meters to the left

Explanation :

Distance : sum of all values of movement given in the question = 8 meters (left) + 6 meters (right) + 2 meters (left)

Displacement : Shortest distance covered from the starting point = 8 meters (left) + 2 meters (left) - 6 meters

Sry I could not explain more hope you found it useful

WHO IS GOOD AT PHYSICAL SCIENCE PLS COME HERE AND HELP ME OUT!!!!

Answers

me i’m very good!! just lmk a question

N
How long would it take a runner to travel 4 miles if they ran at a pace of 2.3 miles/hour?
(10 Points)
O 9.2 hours
O 0.575 hours
O 2.35 hours
O 1.739 hours

Answers

Answer:

9.2

Explanation:

just multiply 4 miles times 2.3 then you get your answer

9.2. Hours or 1.739 hours

The modern periodic table of elements contains
_______ main groups.

Answers

it contains 18 main groups

Answer:

The modern periodic table of elements contains

Eighteen main groups.

What is the velocity of the object moving from 3 - 7 seconds?
O m/s
-6 m/s
6 m/s

Answers

6 m/s. Learn how to read graphs


More work was done. Which statement best describes the cause?
a
There was more force applied; therefore, there was less movement.
b
There was less force applied; therefore, there was more movement.
Oc
There was less force applied; therefore, there was less movement.
Od
There was more force applied; therefore, there was more movement.

Answers

Answer: I think the answer would be D

Explanation:

The more force you apply the more movement you will get.

PLEASE HELP!!!
A group of friends are doing some archery.
When Brian fully stretches the bow, it stores 10 J of energy.
Describe the energy transfer that occurs as Brian stretches the bow.
[2 marks]​

Answers

Answer: potential to kinetic/mechanical

Explanation:

When Brian fully stretches the bow, it stores 10 J of energy. The energy transfer that occurs as Brian stretches the bow will be from the potential energy to the kinetic energy.

What is the law of conservation of energy?

According to the Law of Conservation of Energy, energy can neither be created nor destroyed, but it can be transferred from one form to another.

The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.

In the above problem, the potential energy gets converted into kinetic energy at the expense of the loss of gravitational potential energy between the two positions.

Friends are practicing archery together. The bow holds 10 J of energy when Brian stretches it to its maximum length. As Brian extends the bow, energy will go from the potential energy to the kinetic energy.

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Density is a chemical property of matter.
TRUE
FALSE

Answers

Answer:

False

Explanation:

Density is a physical property of matter.

Answer:

False

Explanation:

Density is NOT a chemical property, it is a physical property.

After you let go of a bowling ball, is there a force pushing it so that it keeps moving
forward? Explain.

Answers

Explanation:

No, the ball keeps moving forward due its momentum.

A net force causes an object to accelerate, which means it speeds up, slows down, or changes direction.  A bowling ball does not speed up after you let go, so there is no forward force.

A monorail starts from rest and accelerates at a rate of 2.2m/s2 for 10s.Then it runs at a constant speed for 74s and then slows down at a rate of 1.5m/s2

Answers

Answer:

d = 4217 m

Explanation:

Case 1.

Initial velocity, u = 0

Acceleration, a = 2.2 m/s²

Let d₁ is the distance in case 1. Using second equation of motion as follows :

[tex]d_1=ut+\dfrac{1}{2}a_1t_1^2\\\\\text{Here, u =0}\\\\d_1=\dfrac{1}{2}\times 2.2\times 10^2\\\\d_1=110\ m[/tex]

Let d₂ in the distance in case 2. Using second equation of motion as follows :

[tex]d_2=ut+\dfrac{1}{2}a_2t_2^2\\\\\text{Here, u =0}\\\\d_2=\dfrac{1}{2}\times 1.5\times 74^2\\\\d_2=4107\ m[/tex]

Total distance,

D = d₁ + d₂

D = 110 + 4107

D = 4217 m

Hence, the total distance covered is 4217 m.

Which economic idea did Adam Smith promote in The Wealth of Nations?

Answers

The economic idea that Adam Smith promoted in The Wealth of Nations was that without government interference, businesses should be able to function freely. This is further explained below.

What is the economic idea that Adam Smith?

Generally,  Smith was an opponent of free trade. open markets tend to self-regulate via competition, market forces, and self-interest.

In conclusion, In Adam Smith's The Wealth of Nations, argued that enterprises should be freed to operate without government intervention.

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Answer:bA country’s wealth should be measured based on its productivity.

Explanation:

Why us an element considered a pure substance

Answers

Explanation:

Hey there!!

An elements is called a pure substance because it is composed of only one kina of atoms in a fix proportion.

Hope it helps...

Answer:

Elements are pure substances because elements are always made up of same kind of particles.

Example:- pure Iron rod (iron is an element)is made up of many similar Iron atoms.

what are forces that two objects apply on each other

Answers

Answer: Whenever two objects are touching, they usually exert forces on each other. The force of gravity, on the other hand, is an example of a force that exists between objects without them having to be in contact. Objects with mass exert forces on each other via the force of gravity.

HOPE IT HELPED:) HAVE A NICE DAY

Plz help me. I need urgent Why a magnetic compass is used to determine direction? Why a nail gets magnetized when kept close to magnet? Why two pins get attracted by bar magnet maintain distance between ends?

Answers

Answer:

Compasses are mainly used in navigation to find direction on the earth. This works because the Earth itself has a magnetic field which is similar to that of a bar magnet. The compass needle aligns with the Earth's magnetic field direction and points north-south. Also, In a magnet all the domains are oriented in the same direction. In the case of a nail, the domains can be aligned in the same direction causing the nail to become magnetic. That is because if you hang a bar magnet from a thread, the north pole will point to magnetic north. When you bring one north pole close to another north pole they repel each other. You can feel the two magnets pushing each other apart.

Pictured is an animal cell and a plant cell. Which organelle labeled in the plant cell produces the energy for the cell?

Answers

Answer:

Mitochondria

Mitochondria. Mitochondria are double membrane-bound cell organelles responsible for the supply and storage of energy for the cell.

Explanation:

The organelle labeled as "mitochondria" in the plant cell produces the energy for the cell through the process of cellular respiration.

What are mitochondria?

Mitochondria are organelles found in most eukaryotic cells. They are often referred to as the "powerhouses" of the cell because their main function is to produce energy in the form of ATP (adenosine triphosphate) through a process called cellular respiration.

Mitochondria have an outer membrane and an inner membrane with folds called cristae. The space between the two membranes is called the intermembrane space, while the space inside the inner membrane is called the mitochondrial matrix. The mitochondrial matrix contains enzymes and other molecules needed for the metabolic reactions of cellular respiration.

Cellular respiration is a process that converts glucose and oxygen into ATP, which is the primary energy source for cells. Mitochondria play a key role in this process by breaking down glucose through a series of chemical reactions that ultimately produce ATP. The energy stored in ATP molecules can then be used by the cell for various cellular processes, such as muscle contraction, protein synthesis, and the maintenance of the cell's membrane potential.

In addition to their role in ATP production, mitochondria are also involved in other important cellular functions, such as calcium signaling, apoptosis (programmed cell death), and the synthesis of certain lipids and heme groups. Mitochondrial dysfunction has been implicated in a number of diseases, including Parkinson's disease, Alzheimer's disease, and diabetes.

Therefore, Through the process of cellular respiration, the organelle in the plant cell known as the "mitochondria" generates the energy for the cell.

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how long a boy will take to run round a square field of side ,35 if he run at the rate of 9km/hr​

Answers

Answer: it will take 15 minutes

Answer:

It will take the boy 136 hours 11 minutes.

Explanation:

35 × 35 = 1225km is the area of the square.

Now find how long it will take the boy:

1225 ÷ 9 = 136.11

Which is 136 hours 11 minutes.

The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21ms. The total mass of the train is 825 g. find the average power delivered to the train during its acceleration.

Answers

Explanation:

Average power = change in energy / change in time

P = ΔE / Δt

P = (½ mv²) / t

P = (½ (0.825 kg) (0.620 m/s)²) / (0.021 s)

P = 7.55 Watts

write any five uses of uv rays​

Answers

-tanning
-disinfection
-indoor gardening
-air cleaning
-curing inks and resins

which expression correctly describes energy using SI units

Answers

Answer:

Joule

Explanation:

energy, work, quantity of heat

m2·kg·s-2

Which careers typically require post-secondary education other than vocational school? Check all that apply. Boiler Operation Construction Management Architecture Repair Work Civil Drafting Carpentering

Answers

Answer: Construction management, Architecture, Civil Drafting.

Explanation: hope this helps :)

Construction Management, Architecture and Civil Drafting are careers typically require post-secondary education other than vocational school. So, the correct options are B, C and E.

What is Career?

Career is defined as a person's metaphorical "journey" through learning, work and other aspects of life where there are many ways to define career and the term is used in different ways.

A career is defined as the variety of experiences that we have had throughout our lives. As we gain more experience in the world of work and life, we build careers. We take into account career paths education, training and paid or unpaid work. Construction Management, Architecture and Civil Drafting are careers typically require post-secondary education other than vocational school.

Therefore, the correct options are B, C and E.

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Does the distance a person kicks a soccer ball
affect how well they will do on their math test?
Identify the independent and dependent
variable

Answers

Answer:

Independent variable: how far the soccer ball is kicked.

Dependent variable: how well the person does on their math test

Explanation:

The distance the ball is kicked is what the scientist can change. On the other hand, in this experiment, how well the person does on their test supposedly relies on how far the soccer ball is kicked.

What indicates that an atom
has no overall charge?

Answers

When the amount of protons and electrons is the same within the atom. Hope this is the answer you’re looking for :)

what is 6,000 in scientific notation

Answers

6,000 in scientific notation is 6 x 10^3.

6 x 10^3 = 6,000

Hope this helps ! <3

An object moves along the x-axis. The graph shows its position x as a function of time t. Find the average velocity of the object from points B to C. −8.3 m/s −4.2 m/s 0 m/s −0.12 m/s

Answers

Answer:

-8.3m/s

Explanation:

its correct

Answer: its 0.

Explanation: Gradpoint

A drunk college student decides to try to do a perfect swan dive from his apartment window into the pool below. The edge of the pool is 5 meters from the base of the building and his window is on the 3rd floor, which is 8 meters from the ground. If he jumps out the window horizontally at a speed of 4 m/s, does he make it into the water or..

Answers

Answer:

He barely makes it but hit his leg on the pool edge.

Explanation:

Using kinematic formula: Δx=[tex]v_{0}t+(1/2)at^2[/tex]

We can plug in delta x, v zero, and acceleration.

delta x = 8 meters, v0 = 0. a = 9.8

8=(1/2)9.8*t^2

Around 1.278 seconds of airtime.

4 * 1.278 = 5.112 meters horizontally assuming no air resistance

That was close!

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Looking at these two quotes from Of Plymouth Plantation, what can the reader infer about the Pilgrims who came over on the Mayflower? But it pleased God before they came half seas over, to smit this young man with a grievous disease, of which he died in a desperate manner, and so was himself the first that was thrown overboard (3). Being thus arrived in a good harbor, and brought safe to land, they fell upon their knees and blessed the God of Heaven who had brought them over the vast and furious ocean, and delivered them from all the perils and miseries thereof, again to set their feet on the firm and stable earth, their proper element (5). Question 3 options: The pilgrims were atheists. The pilgrims were glad to get to shore. The pilgrims laughed at the first man to die on the ship. The pilgrims viewed God as an all-powerful being who could direct the course of the lives of men. Please help!!! Which of the following sets are subspaces of R3 ? 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