On a hot summer day several swimmers decide to jump into a river. They step off the bridge and strike the water at 1.5s later. Ignore air resistance. What is the height of the bridge?
I did it but I don’t know if it’s right
Answers
With sigfigs it is 11m.
When on a hot summer day several swimmers decide to jump into a river. They step off the bridge and strike the water 1.5 seconds later. Ignore air resistance, then the height of the bridge would be 11.03 meters.
What are the three equations of motion?There are three equations of motion given by Newton,
v = u + at
S = ut + 1/2×a×t²
v² - u² = 2×a×s
As given in the problem, when on a hot summer day several swimmers decide to jump into a river. They step off the bridge and strike the water 1.5 seconds later. Ignore air resistance,
By using the Second equation of motion,
S = ut + 1/2×a×t²
S = 0 + 0.5*9.81*1.5²
S = 11.03 meters
Thus, the height of the bridge would be 11.03 meters.
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Related Questions
A location in Florida is facing acute water shortage. Which of these is the best method to conserve water in homes of the location?
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what is the coefficient of static friction if it takes 34n of force to movea box that weighs 67n?
Answers
f = kN ( k is coefficient of static friction, N is normal reaction by the ground)
34=k x 67
Therefore, k = 0.507
The coefficient of static friction would be 0.507 if it takes 34 Newtons of force to move a box that weighs 67 Newtons.
What is friction?Friction is a type of force that resists or prevents the relative motion of two physical objects when their surfaces come in contact.
As given in the problem we have to find out the coefficient of static friction if it takes 34 Newtons of force to move a box that weighs 67 Newtons.
The normal force acting on the box = weight of the box
=67 Newtons
The friction force = coefficient of the friction × Normal force
34 = coefficient of the friction × 67
The coefficient of the friction = 34/ 67
=0.507
Thus, the coefficient of static friction would be 0.507 if it takes 34 Newtons of force to move a box that weighs 67 Newtons.
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Sedimentary rocks are over 10,000 feet thick in some areas.
true or fasle
Answers
Answer: True
Explanation:
Sedimentary rocks are, in average, 1800m thick, where 1m = 3.28084 ft
so 1800 meters are equivalent to 1800*3.2 ft = 5760 ft.
But this is the average, there are some areas with no sedimentary rocks at all, and some areas, like the Texas and Lousiana Gulf coasts, that have around 20,000m of sedimentary rock, and knowing that 1m = 3.2ft
20,000m is a lot more than 10,000 feet, so the statement is true.
what is the mass number of an atom with 5 protons and 7 neutrons?
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Why do oceanographers study Meddies?
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true or False: Friction makes energy vanish. Explain your answer!
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What are the formulas to calculate acceleration A. velocity and time B. displacement and time C. Change in distance and time D. Change in velocity and time
Answers
Final answer:
Acceleration can be calculated using the formula for change in velocity divided by change in time. For example, if an object starts with an initial velocity of 10 m/s and ends with a final velocity of 20 m/s in a time interval of 5 seconds, the acceleration can be calculated as 2 m/s².
Explanation:
The formula to calculate acceleration is d. Change in velocity and time. Average acceleration can be found by dividing the change in velocity by the change in time. For example, if an object starts with an initial velocity of 10 m/s and ends with a final velocity of 20 m/s in a time interval of 5 seconds, the acceleration can be calculated as (20 m/s - 10 m/s) / 5 s = 2 m/s².
which force acts as an object to move it from rest or a constant straight-line motion?
A . unbalanced
B. Along a straight line
C. Inertial
D. Balanced
Answers
The force that is applied in the straight line leads to motion in a straight line.
Effect of force on an objectForce along a straight line is responsible for the movement of an object from rest or a constant straight-line motion because there is no force present in the opposite direction. When the force is applied in the form straight line means from backside of an object, the body moves in the forward direction if no force is coming from the front side.
This type of force compels the object to move in the forward direction in a straight line so we can conclude that the force that is applied in the straight line leads to motion in a straight line.
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Which of the following is used to determine if a star is moving closer to Earth?
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which of the following types of waves has the greatest amount of energy?
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hope it helped!
Describe how an electromagnet is created? What makes it attract ferromagnetic materials?
Answers
A wire that has electrical current successively over it makes a magnetic field. Actually, the simplest electromagnet is a single wire that is twisted up and has an electric current consecutively through it. The magnetic field produced by the coil of wire is like a normal bar magnet. Only definite materials, for instance iron, nickel, cobalt, and gadolinium, display strong magnetic properties. These materials are called ferromagnetic. Ferromagnetic materials will react powerfully to magnets and can also be magnetized themselves. Often an electromagnet is enclosed around a core of ferromagnetic material, for example steel, which improves the magnetic field produced by the coil.
WILL GIVE BRAINLIEST!!!
The Mid-Atlantic Ridge in the Atlantic Ocean is the site of the largest mountain range in the world. It runs all the way from the Arctic Ocean to the southern tip of Africa. Because of movements at the Mid-Atlantic Ridge, the Atlantic Ocean widens by about 2.5 centimeters each year. Which type of plate boundary causes this motion?
A) Transform boundary
B) Strike-slip boundary
C) Divergent boundary
D) Convergent boundary
Answers
Answer:
Explanation:
Divergent Boundary
Answer:
The Mid Atlantic Ridge, like other ocean ridge systems, has developed as a consequence of the divergent motion between the Eurasian and North American, and African and South American Plates
Explanation:
Which describes the greatest displacement?
A) walking 3m east, then walking 3m north, then 3m west
B) walking 3m east, then 3m south, then 3m north
C) walking 3m north, then 3m south, then walking 3m north
D) walking 3m north, then 3m west, then 3m south
Thank you!
Answers
The greatest displacement is either option A or C, as both result in the person being displaced by 3 meters north of their starting point.
Explanation:The question asks which of the given options describes the greatest displacement. Displacement is a vector quantity that describes the change in position of an object. It is important to understand that displacement takes into account the initial and final positions, not the total distance traveled.
A) walking 3m east, then walking 3m north, then 3m westB) walking 3m east, then 3m south, then 3m northC) walking 3m north, then 3m south, then walking 3m northD) walking 3m north, then 3m west, then 3m southFor option A, the displacement would result in the person being 3m north from their starting point, since the east and west movements cancel out. Option B results in the person being 3m east of the starting point, as the south and north movements cancel each other out. Option C essentially brings the person back to their starting point after the first two movements, and then displaces them 3m north, similar to option A. Finally, option D involves the person moving 3m in each of the cardinal directions, which would bring them right back to their starting point, resulting in a displacement of 0 meters.
The correct answer is either option A or C, as both result in the greatest displacement, which is 3 meters north.
Plateaus consist of vertical beds of sedimentary rock.
True or False
Answers
The correct answer is False.
The statement "Plateaus consist of vertical beds of sedimentary rock" is False. Plateaus are typically characterized by horizontal layers of sedimentary rock. According to the law of original horizontality, sedimentary layers are deposited in horizontal, or nearly horizontal, layers. Over time, these horizontal beds of sedimentary rock can form large, flat elevated areas known as plateaus.
Which of the following is not true of the seasons?
The Earth is closer to the sun during the summer and farther away from the sun during the winter.
The seasons are caused the tilt of the Earth on its axis.
Summer does not start on the same day in every country on the Earth.
During the summer, days are longer.
Answers
Summer does not start on the same day in every country on the Earth. This statement is not true of the seasons. Hence option C is correct.
What is summer ?Summer is the hottest season of the year, lasting from spring through October. It is commonly described as the period between the summer solstice (year's longest day), June 21 or 22, and the autumnal equinox (day and night equal in duration), September 22 or 23 in the Northern Hemisphere, and December 22 or 23 in the Southern Hemisphere. Summer temperatures differ from other seasons only in the middle and high latitudes; temperatures in the tropical areas fluctuate little from month to month. See season for information on the physical reasons of the seasons.
Summer is connected with development and maturity in European languages, particularly that of cultivated plants, and indeed, summer is the season of highest plant growth in countries with sufficient summer rainfall. Many civilizations have utilised festivals and ceremonies to commemorate summer in appreciation of its role in food production.
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A tennis ball is tossed up off a building with a velocity of 22m/s. It takes 6.4s to reach the ground. How high is the building and what is the maximum height of the tennis ball?
Answers
Our knowns:
Vi (initial velocity) = 22m/s
Vf (final velocity) = 0m/s (when the ball reaches its apex)
a (acceleration, rounded to make life easier) = -10m/s²
t (total time) = 6.4s
Our unknown:
Δx (displacement)
So now with all of that, we can get started.
First, we'll calculate the height of the ball at its apex:
Vf² = Vi² + 2aΔx
0 = 484 + 2(-10)Δx
0 = 484 - 20Δx
-484 = -20Δx
24.2 = Δx
This means that, when the final velocity is zero (max height), the height of the ball is 24.2 m. Now that you know this, you can find the remaining height the ball has to fall to reach the ground (now we need the time).
Tip: Remember that this is symmetrical movement, so the final velocity will be equal to the initial velocity, but only negative because the now the ball is falling. Similarly, the initial velocity will now be the final velocity the ball had at its apex.
You can use a few equations, but I chose this one:
Δx = [tex] \frac{1}{2} [/tex](Vi + Vf)t
Δx = [tex] \frac{1}{2} [/tex](0 - 22)6.4
Δx = -70.4 m (it's negative because the ball is falling)
NOT done yet. That does not mean that the building is 70.4 m tall; it is the displacement from which the ball fell from its apex. However, knowing this and the height of the ball at its apex, we can find what is in between, AKA the height of the building.
Height of building = 70.4 m - 24.2m = 46.2m
So, the height of the building is 46.2m. And the maximum height of the ball is 70.4m. For the sake of significant figures, it would be 46m and 70.m.
I've included a graphic to help visualize it. Hopefully it's helpful.
At 2.5 seconds, the helicopter has a kinetic energy of 20J. What is its mechanical energy at that time?
Answers
The function of the respiratory system is to
A) did the body of waste
B) transport materials in the body
C) break down food
D) breathe
Answers
So D.
hope this helps!
Answer:
to breathe
Explanation:
An object is dropped from a building and strikes the ground with a speed of 31m/s. How tall is the building?
Answers
Final answer:
The height of the building from which an object is dropped can be calculated using the formula h = v²/(2g). Substituting the given final velocity of 31 m/s, the building's height is found to be approximately 49.03 meters.
Explanation:
Calculating the Height of the Building from Final Velocity
We can calculate the height of the building from which an object is dropped using the final velocity and the equations of motion under gravity. Assuming that air resistance is negligible and acceleration due to gravity g is constant at 9.8 m/s², the formula derived from the kinematic equations is h = v²/(2g), where h is the height, v is the final velocity, and g is the acceleration due to gravity.
Given that the final velocity is 31 m/s, we can substitute this into the formula along with the acceleration due to gravity:
h = (31 m/s)² / (2 * 9.8 m/s²) = 961 / 19.6 = 49.03 meters. Therefore, the height of the building is approximately 49.03 meters.
Explain how a microwave oven heats a cup of water.
Answers
A microwave oven heats water by emitting microwaves that cause water molecules to rotate and create thermal energy, efficiently heating the liquid due to the molecular freedom in the water.
A microwave oven heats a cup of water by utilizing microwaves at a frequency of 2.45 GHz, which excite the water molecules in the cup. These microwaves create an oscillating electric field that exerts a torque on the dipolar water molecules, causing them to rotate aggressively. This doesn't substantially heat the container as materials like plastic and glass lack these dipolar water molecules. This molecular motion translates into thermal energy due to friction and collisions between molecules, thus heating the water. It's observed that heating liquids like water is much more efficient than solids due to the greater freedom of movement that allows the molecules in liquids to more readily absorb and disperse the energy from the microwaves.
Which of the following adaptations would help a tree-dwelling nocturnal scavenger survive in its environment?
Answers
Answer:
Night vision
Explanation:
Nocturnal animals have generally bigger eyes than humans and have mostly a tubular shape. This makes more light enter the retina which makes it possible for animals to see at night. Nocturnal animals do all of their activities at night so they need night vision to survive. With night vision they can hunt for food, run away from predators.
The color of fur helps animals to camouflage themselves this would be of no use to nocturnal animals.
Furry heels and short snouts also would be of no use to nocturnal animals.
Food chains are made up of many_____________. HELP ASAP!!!!!
Answers
Possible answer could be Organisms
There are a lot of Organisms in the overall food chain.
Hope this helped!
Your environment can play a role in whether or not a specific gene is expressed
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hope it helped!
Choose all answers that apply. Whatcha of the following do plants need for photosynthesis? 1. Carbon dioxide 2. Water 3. Sunlight 4. Chlorophyll 5. Oxygen.
Answers
So Sunlight, Carbon Dioxide and Water
Final Answer:
Plants need the following for photosynthesis:
Carbon dioxideWaterSunlightChlorophyllExplanation:
Photosynthesis is the process by which plants convert carbon dioxide and water into glucose (a form of sugar) and oxygen using sunlight as energy. Carbon dioxide is absorbed from the atmosphere through small pores in the leaves called stomata. Water is absorbed from the soil through the plant's roots. Sunlight is captured by chlorophyll, a green pigment found in chloroplasts within plant cells. Chlorophyll absorbs sunlight energy, which is used to drive the chemical reactions of photosynthesis. Oxygen is produced as a byproduct of photosynthesis and is released into the atmosphere. Therefore, all of the options except for Oxygen are necessary for photosynthesis to occur in plants.
How does an atom change if all of its electrons are removed?
Answers
Answer:
The atom becomes positively charged.
Explanation:
I took the assignment.
The process by which planets form when material orbiting some stars starts gathering together through collision and gravitation and electrostatic attraction is called
A) accretion
B) nuclear fusion
C) differentiation
D) strong nuclear force
Answers
Answer: A) accretion
Explanation:
Accretion is the growth of a body by aggregation of matter. This is a process of accumulation of particles in a massive object gravitationally attracting more matter, typically gaseous matter, in an accretion disk.
It should be noted that this theory was proposed by Russian geophysicist Otto Schmidl in 1944 and explains that most of the objects in the universe, such as galaxies, stars and planets, are formed by accretion processes. A good example of this is the accretion of mass by a star that is given by the addition of mass to the star from interstellar matter or a neighbor star.
Shield volcanoes result from _____.
liquid lava
cinders
bombs
ash
Answers
Answer:
liquid lava
Explanation:
How are frequency and wave period Related?
Answers
The frequency and period of any wave are reciprocals.
Frequency = 1/period and Period = 1/frequency .
That means that the product of (frequency) times (period) of any wave is always the same. The product is always ' 1 ', with no unit.
Any wave's frequency and period are reciprocals. Time period is the inverse of the frequency.
What is frequency?Frequency is defined as the number of cycles per second. The time to make one complete cycle is frequency. Its unit is Hertz.
Frequency and period are related as;
Period = 1/frequency
Frequency = 1/period
Hence,any wave's frequency and period are reciprocals.
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Select the best answer for the question.
19. In a stringed musical instrument, the sound frequency of a particular string can be increased by
Answers
Tightening the string of a musical instrument will reduce its size and will make the sound waves to travel faster through the string when the string is plucked and it will produce an higher pitch.
Denise is conducting a physics experiment to measure the acceleration of a falling object when it slows down and comes to a stop. She drops a wooden block with a mass od 0.5 kilograms on a sensor on the floor. The sensor measures the force of the impact as 4.9 newtons. Whats the acceleration of the wooden block wgen it hits the sensor
Answers
Answer:
[tex]a = 9.8 m/s^2[/tex]
Explanation:
As we know that here given parameters are
[tex]mass = 0.5 kg[/tex]
also we know that force of impact on the floor is given as
[tex]F = 4.9 N[/tex]
now we know by the Newton's 2nd law says that the net force on an object is product of mass and its acceleration
it is given by
[tex]F = ma[/tex]
now we have
[tex]a = \frac{F}{m}[/tex]
[tex]a = \frac{4.9}{0.5}[/tex]
[tex]a = 9.8 m/s^2[/tex]