9. A ball is thrown straight up with an initial speed of 30 m/s. How long will it take to reach the top of its trajectory, and high will the ball go?
Answers
Answer:
1.) Time t = 3.1 seconds
2.) Height h = 46 metres
Explanation:
given that the initial velocity U = 30 m/s
At the top of the trajectory, the final velocity V = 0
Using first equation of motion
V = U - gt
g is negative 9.81m/^2 as the object is going against the gravity.
Substitute all the parameters into the formula
0 = 30 - 9.81t
9.81t = 30
Make t the subject of formula
t = 30/9.81
t = 3.058 seconds
t = 3.1 seconds approximately
Therefore, it will take 3.1 seconds to reach to reach the top of its trajectory.
2.) The height it will go can be calculated by using second equation of motion
h = ut - 1/2gt^2
Substitutes U, g and t into the formula
h = 30(3.1) - 1/2 × 9.8 × 3.1^2
h = 93 - 47.089
h = 45.911 m
It will go 46 metres approximately high.
Related Questions
what is evaporation will give brainliest
Answers
Answer:
Evaporation is the process by which water changes from a liquid to a gas or vapor.
i will give you 55 points to write me a letter about stopping pollution
Answers
Answer:
Pollution is a really big problem in our planet and it must be stopped immediately. It must be stopped before our planet goes extinct. There are three main reasons, in my opinion, why pollution should be stopped. We can’t keep living in some of the conditions our planet is on because of us and what we do to it.
The first reason why we should stop pollution is that pollution is destroying the environment we live in. Power stations produce nearly 10 billion tons of carbon dioxide per year. Carbon dioxide is a big contribution for pollution. Carbon dioxide affects our climate in many different ways. The way it works is that basically certain 'greenhouse gases' can't escape from our atmosphere because they get trapped. CO2 is what plants need to create oxygen. But when there is too much carbon dioxide being admitted into our environment from burning fossil fuels, cars etc, and we are cutting down trees for paper, it is imbalanced. Pollution is the introduction of harmful contaminants into an environment that causes instability, disorder, harm or discomfort to living organisms and ecosystems.In 1987, the U.S. released 1.2 million tons of toxic chemicals into our atmosphere, 670,000 tons into our soil, and 250,000 tons into our water. 40% of America’s rivers and 46% of America’s lakes are too polluted for fishing, swimming, or aquatic life. This shows that water pollution, air pollution, and ground pollution are common
The second reason why we should stop pollution is that it also affects us humans. Pollution also affects human life and that is a big problem. According to the US-EPA, emissions from power plants contribute to over 2,800 lung cancer deaths and 38,200 heart attacks annually in the US. The risk of cancer from breathing diesel gas is about ten times more than ingesting all other toxic air pollutants combined, with diesel emissions contributing to over 70% of the cancer risk from air pollution in the USA. both developing and developed nations, fossil fuel consumption- mostly by industry, vehicles and power plants, releases air pollutants such as particulate matter, sulfur dioxide, nitrogen dioxide, and ground-level ozone. According to the World Health Organization, indoor air pollution from the burning of coal or biomass fuels like wood jeopardizes perhaps half of humanity. Air pollution causes 2 million deaths per year, mostly from heart disease and respiratory disorders like infections and lung cancer.
The third reason why we should stop pollution is that if we do, we can live longer on this planet. If we dont stop pollution and global warming, something really bad will happen to every. Our existance, humans, won’t be over if we do the right thing if we all help the environment. Modern humans have been on Earth for 200,000 years and in those years, humans have destroyed the planet so quick. We can live longer and extend our existance on this planet so that our children’s children’s can live in a planet without worries.
In conclusion, pollution must be stopped immediately and once in for all. This is our only home and we must protect it and take care of it as much as we can. pollution must be stopped before we ruin our planet. We can live anywhere else, therefore we must try to save it.
HOPE THIS HELPS :)
When you drop something, first of all it accelerates.
The faster it falls, the bigger the force of ______ that acts on it.
choose from the list to complete the sentence:
friction gravity air pressure
note: apparently the answer is friction but it doesn't make sense to me so please explain.
Answers
The faster an object is going, the more resistance there will be. An example of this would be if you're running the faster you run, the more air is going against you.
I hope this helps!
The harder I push an object the _______ it will travel.
Group of answer choices
A. happier
B. farther
C. slower
Answers
It's b, because the more force an object it is given the harder it will be for it to slow down.
WHAT always results from friction. Heat, Mechanical energy, or motion
Answers
Answer:
heat
Explanation:
Answer:
motion heat
Explanation:
Do nutrients cause seagrass to grow more in this area? If so, are both nitrogen and phosphorus equally important? Explain your answer.
Answers
Seagrasses are a vital part of the marine ecosystem..
Seagrasses are submerged flowering plants found in shallow marine waters, such as bays and lagoons and along the continental shelf in the Gulf of Mexico. A vital part of the marine ecosystem due to their productivity level, seagrasses provide food, habitat, and nursery areas for numerous vertebrate and invertebrate species. The vast biodiversity and sensitivity to changes in water quality inherent in seagrass communities makes seagrasses an important species to help determine the overall health of coastal ecosystems. Seagrasses perform numerous functions:
Stabilizing the sea bottom
Providing food and habitat for other marine organisms
Maintaining water quality
Supporting local economies
Using proper units is important when recording data. In this lab, you determined three properties of the objects: mass, volume, and density. What are the units for each property?
The units used for mass were
The units used for volume were
The units used for density were
Answers
Answer:
The units used for mass were
✔ grams
The units used for volume were
✔ cubic centimeters
The units used for density were
✔ grams/cubic centimeter
Explanation:
check marks show i got it right
Answer:
The units used for mass were
✔ grams
.
The units used for volume were
✔ cubic centimeters
.
The units used for density were
✔ grams/cubic centimeter
.
Explanation:
What is a major drawback of nuclear energy? (1 point)
Answers
Answer:
Nuclear waste
Explanation:
It is extremely radioactive and can remain radioactive for hundreds of years.
Nuclear disasters are also very important and one of the major downsides of nuclear energy. Take Chernobyl for an example, the radiation produced by nuclear energy can cause plants animals and humans to suffer from diseases, mutations, and malfunctions. They also cosmetically damage skin and the environment with chemicals.
Select the pathway that the career fits in.
Juliana is the head cook in a school cafeteria.
Feng leads walking tours in a city.
Walter handles luggage for guests in a hotel.
Olivia is an athletic trainer in a gym.
Robert handles money in a casino.
Answers
2) Feng is a tour guide
3) Walter is a bellman or a porter
4) Olivia is a fitness or personal trainer
5) Robert is either a cashier or a dealer
Answer:
1. Restaurant and Food/Beverage Services, 2. Travel and Tourism, 3. Lodging, 4. Recreation, amusements, and attractions 5. Recreation, amusements, and attractions
Explanation:
Can I get brainliest, please?
Sorry, it's late.
Have a great day/night! ;)
If 6 Chlorine atoms come out of a chemical reaction, how many must have entered into the reaction?
Answers
Answer: 2
Explanation:
PART A: The image shows a person looking at the Moon through a telescope. Describe how light travels from the sky to the viewer’s eye.
Part B
The light rays come close together as they travel from the large mirror to the small mirror. How do you think this affects the size and clarity of the image the viewer sees?
Part C
How does the eyepiece change the image for the viewer?
Part D
The eyepiece has a curved piece of glass that bends light rays toward the center. What is the bending of light called?
Answers
Answer:
Describe how light travels from the sky to the viewer's eye. First, light from the sky travels into the concave mirror, which reflects the light to a smaller and flat mirror. Then, the small mirror reflects that light into the telescope's magnifying lens. This lens makes the light reach the viewer's eyes.
Which is the definition of the equator?
A. The equator is half of a sphere, which is used to describe one half of the Earth.
B. The equator is the imaginary line that divides the Earth into two equal parts. It is also used as the basis for the word’s time zones.
The equator is the imaginary line that divides the Earth into two equal parts. It is also used as the basis for the word’s time zones.
C. The equator is an imaginary horizontal line drawn on the Earth equally between the North and South poles.
D. The equator is half of a circle used to describe the northern half of the Earth.
Answers
Answer:
D. The equator is half of a circle used to describe the northern half of the Earth.
Explanation:
hope it helps
Answer: C
Explanation: The equator divides the earth into North and South pole
Suppose a 4,000-kg elephant is hoisted 20 m above Earth’s surface. What will the elephant’s gravitational potential energy be? (Show your work in the space below.)
Answers
Answer: 784000 J or 784 KJ
Explanation:
U = m * g * h
U = 4000 * 9.8 * 20
U = 784000 J
Hope this was helpful:D
PLEASE help with this!!! i'll give brainliest if right!!
Answers
2: decreases, increases, increases, stays the same
3: increases, decreases, decreases, stays the same
4: increases, decreases, decreases, stays the same
Proper nutrition is needed to be a healthy person. Track how many calories you eat and how many calories you burn in a day. Select the Calorie Tracker to get started. Use the rubric to guide you.
(ion know how to keep track of calories and i hate try to do it so just make up some paragraph for me for this assignment please.)
Answers
Here, I hated PE too. Write down calories, and make up lame exercises to "burn them off" like running or swimming or dancing. Do it appropriately, sometimes you can't allways burn it off, like if you gained 100 calories and only burned 80. It's fine.
A rule of thumb is that about 100 calories per mile are burned for a 180-pound person and 65 calories per mile are burned for a 120-pound person. A 150-pound person will burn roughly 400 calories during an hour-long swim at a moderate pace and 700 at a vigorous one. The average person will burn 300-800 calories per hour dancing.
which statement describes how adding oil effects the mechanical efficiency of a car's engine?
Answers
Answer:
Mechanical efficiency accounts for losses due to engine friction and ancillaries such as the lubricant pump, coolant pump, fuel pump and cooling fan. Engine friction arises whenever there is relative motion between parts. Journal bearings on the crankshaft, connecting rods and camshaft as well as piston rings and piston skirts are important sources
Explanation:
Ik this is a scientific formula but what does FEDE = FRDR mean
Answers
Answer:
It is used to calculate resistance of a lever as in the use of a pry bar or pulley.
It is used to calculate resistance of a lever as in the use of a pry bar or pulley.
A tornado traveled east across the United States a distance of 600 meters in 6 minutes. What was the VELOCITY of the tornado?
A) 100 m/min east
B) 10 m/min east
C) 100 m/min
D) 360 m/min east
Answers
Answer:
A 100 meters per minute.
Explanation:
Just divide 600 by 6
Which of the following will most likely be a sustainable environment?
A. An environment with a small variety of plants and animal species
B. An environment with a large variety of plant and animal species
C. An environment with many plant species but with only a few animal species
D. An environment with many animal species but with only a few plant species
Answers
Answer:
I think A
Explanation:
Why do you see objects when you shine a flashlight in a dark room? A. The objects you see are refracted. B. The objects you see are blackened. C. The objects you see are illuminated. D. The objects you see are luminous.
Answers
Answer:
A
Explanation:
it s refracted
Lab Report
Motion and Forces
It’s time to complete your Lab Report. Save the lab to your computer with the correct unit number, lab name, and your name at the end of the file name (e.g., U4_ Lab_MotionAndForces_Alice_Jones.doc).
Introduction
What was the purpose purpose of the experiment?
The purpose of the experiment is to test the hypothesis.
What were the independent, dependent, and control variables in your investigation? Describe the variables for each part of the experiment.
Write a hypothesis based on observations and scientific principles.
Type your answer here:
Experimental Methods
What tools did you use to collect your data?
Questionnaires and observations.
Write your procedure. List each step so that another student could follow the procedure and repeat your experiment.
Type your answer here:
Data and Observations
Record your observations.
Type your answer here:
Conclusions
What conclusions can you draw about how the sum of forces acting on an object affect its motion? Write an evidence-based claim.
Type your answer here:
Which mass, A, B, or C, was the greatest? Use the observations from your experiment and your knowledge of Newton’s laws of motion to write an evidence-based claim.
Type your answer here:
Make a model that shows the forces acting on two blocks on a flat, frictionless surface:
A 1 N block at rest
A 1 N block with 2 N of force applied in one horizontal direction
Include arrows to represent the forces and labels to indicate the magnitude of each force. Use your model to compare and explain the motion of each block.
Type your answer here:
Answers
Answer's C
Explanation: The matter that surrounding this whole planet or time and frequencies the motion and forces that people can't determine unless made a hypothesis
Energy that comes from the sun—solar energy—is clean. It does not cause pollution the way energy from fossil fuels (like gas and oil) does. However, solar energy must be collected before it can be used. The instruments used to collect solar energy are quite costly.
This paragraph states that solar energy ________.
A) causes a lot of pollution
B) is expensive to collect
C) is one kind of fossil fuel
D) is a cheap way to get energy
Answers
Is expensive to collect
Which types of waves requires matter to carry energy? electromagnetic waves only mechanical waves only electromagnetic and mechanical waves longitudinal and electromagnetic waves
Answers
Answer: Mechanical waves
Explanation:
Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave. Sound waves are incapable of traveling through a vacuum.
Answer:
Mechanical waves
Explanation:
edge 22'
Any other Gypresgions come from shakespeare and are they used today?
Answers
Answer:Both books find Shakespeare deeply Catholic, but they reach very different conclusions about what that meant in his life and work during a time of official Protestantism, the Jesuit mission to England, and sharp divisions among Anglicans, Puritans, and Catholics.
Explanation:
What does the amplitude of a light wave determine?
Answers
Hope this helps :)
100 POINTS!! A chemical formula is used to represent the compound formed when two or more elements bond. Your parents decide to have a BBQ this weekend, but they need to refill the propane tank before they can start the grill. List each element and how many atoms of each element are present in one molecule of propane C3H8.
Answers
Answer:
C3H8 contains three carbon atoms, and eight hydrogen atoms.
H8- 8 hydrogen atoms
Erin is keeping a science journal. She wrote the following paragraph that explains how light travels through different mediums. But she’s made one mistake. Which sentence in Erin’s journal is incorrect?
A ray of light passes through the air and enters the water inside a metal container. The light ray bends as it crosses the boundary between air and water. Once it hits the bottom of the container, the ray gets reflected. The reflected ray passes back through the water and enters the air without bending. In this example, the ray of light is both reflected and refracted.
Answers
Answer: The first part I think
Explanation:
Im not too sure on this one
What two gases in the atmosphere do animals and plants need to breathe and grow?
Answers
Answer: Explanation:
Plants and animals each produce the gases that the other needs to live. Plants need carbon dioxide—people and other animals exhale carbon dioxide as a waste product. People and other animals need oxygen—plants produce oxygen during an important process called photosynthesis, which turns the sun's energy into nutrients.
A driver is driving a 6371 kg lorry. After spotting a hazard, the driver applies the brakes. The lorry decelerates uniformly and comes to a stop 60 m after the brakes are applied. Estimate the braking force needed to stop the lorry.
Answers
Answer:
The estimated braking force needed to stop the lorry is zero, based on the given information and calculations. However, it's important to note that this result is likely not accurate, as some force is required to stop a moving object. It's possible that additional information or calculations are needed to obtain a more realistic estimate of the braking force.
Explanation:
To estimate the braking force needed to stop the lorry, we can use Newton's second law of motion, which states that force (F) is equal to mass (m) multiplied by acceleration (a).
In this case, the lorry decelerates uniformly, so the acceleration is constant. The initial velocity is assumed to be zero since the lorry comes to a stop. The final velocity is also zero. Therefore, we can use the equation:
Final velocity squared (vf^2) = Initial velocity squared (vi^2) + 2 * acceleration (a) * distance (d)
Since vi = 0 and vf = 0, the equation simplifies to:
0 = 0 + 2 * a * d
Solving for acceleration (a), we have:
2 * a * d = 0
a = 0
Since the acceleration is zero, it means that the braking force needed to stop the lorry is also zero. This is likely not an accurate result as some force is required to stop the lorry. It's possible that additional information or calculations are needed to accurately estimate the braking force.
The braking force required to stop a 6371 kg lorry after spotting a hazard and applying the brakes is what the question is asking for. The lorry decelerates uniformly and comes to a stop 60 meters after the brakes are applied.
The following steps will guide you on how to calculate the braking force:
Step 1: Determine the mass of the lorry which is 6371 kg. This will be denoted as m.
Step 2: Determine the distance travelled by the lorry, which is 60 m.
Step 3: Determine the time taken by the lorry to stop. This can be done by using the formula for uniform deceleration, which is a = (v-u)/t where v is the final velocity, u is the initial velocity and a is the uniform deceleration. Since the lorry comes to a stop, its final velocity is zero and its initial velocity is unknown.
However, we can assume that the lorry was initially travelling at a constant speed before spotting the hazard. Therefore, we can assume that the initial velocity was equal to the average velocity of the lorry before the brakes were applied.
This can be calculated using the formula v = d/t where d is the distance travelled and t is the time taken. The average velocity can therefore be calculated as follows: v = d/t = 60 m/t
Step 4: Rearrange the formula for uniform deceleration, a = (v-u)/t, to find u which is the initial velocity. Since the lorry comes to a stop, we know that v = 0.
Therefore: u = v - at where a is the uniform deceleration and t is the time taken to stop which is also equal to the time taken for the lorry to travel the distance of 60 meters. Substituting for v, we get: u = - at
Step 5: Calculate the acceleration of the lorry using the formula a = (v-u)/t. Since the final velocity is zero, we get: a = -u/t = -(-at)/t = a The acceleration is negative since the lorry is decelerating.
Step 6: Calculate the braking force using the formula F = ma where F is the braking force and m is the mass of the lorry. Therefore: F = ma = (-ma) since a is negative = (-6371 kg) (a) Therefore, the braking force required to stop the lorry is -6371a N where a is the uniform deceleration calculated in Step 5.
For more such questions on lorry decelerates
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this is for 6.02 in comprehensive science for flvs
4. How does this simulation demonstrate the law of universal gravitation?
Answers
Answer:
Please provide an image to help clarify
Explanation:
thanks :)