A stone is dropped from a 75-m- high building . When this stone has dropped 15 m, a second stone is thrown downward with an initial velocity such that the two stones hit the ground at the same time. What was the initial velocity of the second stone?
Answers
Answer:
The initial velocity of the second stone is 34.3 m/s
Explanation:
The distance height covered by the second stone will be
75m - 15m = 60 m
Since the two stones hit the ground at the same time.
Using third equation of motion, which state that;
V^2 = U^2 - 2gH
Where
U = Initial velocity
V = final velocity
H = 60 m
g = 9.81 m/s^2
As the stone reaching the ground, that is, coming to rest, V = 0. Therefore,
Substitute all the parameters into the equation
0 = U^2 - 2 × 9.81 × 60
U^2 = 1177.2
U = 34.3 m/s
The initial velocity of the second stone is 34.3 m/s
Related Questions
This is a science question
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The air currents across the continents would determine the distribution of the air.
What are air currents?Air currents across the continents are primarily driven by temperature differences and the rotation of the Earth. The warm air near the equator rises and flows towards the poles, while the cooler air near the poles sinks and flows towards the equator.
This creates large-scale circulation patterns known as Hadley cells, Ferrell cells, and Polar cells. These cells are responsible for the trade winds, westerlies, and easterlies, respectively. Additionally, there are also local winds caused by differences in terrain, such as sea breezes and valley breezes.
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the river ______ pieces of ______ rock as it floats along.
Word bank: cementation, compaction, transports, sedimentation, bottom, water, sea, glue, weight, minerals, broken, deposited, water, low.
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ill make you brainliest! The Earth is shown as a circle. Equator is shown and labeled at 0 degrees. 30 degrees north and south latitudes are shown and labeled. 60 degrees north and south latitudes are shown and labeled. Curved arrows are shown from the top and bottom ends of the circle towards 60 degrees north and south latitudes.
What best describes these winds?
Trade winds blowing in a curved manner due to rotation of Earth
Polar easterlies blowing in a curved manner due to Coriolis Effect
Polar westerlies that curve due to air above poles being relatively cooler
Jet streams that curve due to air above equator being relatively warmer
Answers
Answer:
Polar easterlies caused due to rising, warm air above the poles
Explanation:
Answer:
Polar easterlies caused due to rising, warm air above the poles.
Explanation:
A skydiver dives from an airplane. Air resistance is measured each second following the skydiver’s jump. Which statement BEST identifies the skydiver’s speed at each second?
PLS HELP QUICK
Answers
Answer: (B) 4 Seconds
Explanation: The Balance of weight and air resistance equals out after 4 seconds giving you your terminal velocity. (the fastest speed you can travel at your given weight and air resistance)
Answer : B. The sjydriver has the fastest speed at 4second.
What is air resistances ?
--Air resistance is a type of friction force.
-- Air resistance, there are not two solid surfaces in contact.
-- Air resistance is the frictional force acting on an object and the air around them.
--This means that friction always pushes in the opposite direction than the skydiver is travelling, therefore slowing the skydiver down.
Concept Used
-- When the skydiver jumps off the plane, their speed would accelerate because the pull of gravity on the person, or their weight force, is greater than the air resistance slowing them down.
-- A person’s weight force will always stay the same.
-- The weight force of the person will equal their air resistance.
-- This would make the skydiver travel at constant speed.
--To travel at constant speed forces have to be equal to zero.
--This constant speed is called terminal velocity
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Which of the following forces has not changed Earth's surface?
folding
erosion
weathering
gravity
Answers
Answer:Gravity is the force among the options listed that has not directly changed Earth's surface.
Explanation:
Gravity is a fundamental force that acts on all objects with mass, including the Earth itself, but it does not cause changes or modifications to the Earth's surface features. Instead, gravity influences the movement of materials and the shape of the Earth's surface by exerting a pulling force on objects. On the other hand, folding, erosion, and weathering are all processes that directly contribute to shaping
Explain:The Sun appears to move across the sky each day, but we know that it only looks that way because the Earth is moving (rotating). Write out a way to demonstrate or explain this idea to a younger student. (Hint: think about what it’s like to look out the window of a moving car or to spin in a circle.)
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Answer:
Earth is always moving. Each day, the Earth makes one complete rotation on its axis. ... As Earth rotates, it seems like the sun is moving across the sky, but it's really the Earth that is spinning. It takes 24 hours to complete one rotation, which is why there are 24 hours in one day.
Explanation:
Explanation:
write 20 physical Quantities withS.I unit and formula
What is friction? Help plsss. Most accurate one will get brainliest!
Answers
Answer:
Explanation:
Friction is a force which opposes the relative motion of two objects in contact.
Answer: The resistance that one surface or object encounters when moving over another
Explanation: The action of one surface or object rubbing against one another.
Example: Sally rubbed the two sticks TOGETHER that is an example of friction.
Help!!!!! will give brainlist
Answers
Answer:
The last one
Density=mass/volume
Justin and Oscar each hit a baseball with a bat. The baseballs have the same mass, but the ball Justin hits has a greater acceleration. What might be the reason for the greater acceleration of Justin's baseball?
Answers
The acceleration is different in both cases because, the force applied is different. Acceleration is force divided by mass of the object. Thus, Justin had greater force than Oscar.
What is force ?Force is an external agent acting on body to change its motion or deform it. There are various kinds of forces such as frictional force, gravitational force, nuclear force etc.
According to Newton's second law of motion, the force acting on an object is the product of its mass and acceleration.
Thus, F = ma
Hence, as the force increases the body is accelerated more.
With the same mass for the two balls, the force used to hit it was different and thus, the acceleration differs in both cases. Therefore, Justin has the greater force.
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Acceleration - Opening the parachute
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Which example demonstrates kinetic energy?
A: A wave crashing on the shore
B: A stretched-out rubber band
C: A car parked in the parking lot
D: A rock sitting at the top of a hill
Answers
Answer:
B
Explanation:
Because it is an Elastic Potential Energy, for instance, a stretched rubber band has the potential to do work or change things. This form of energy is called elastic potential energy.
Kinetic energy is a form of energy that an object or a particle has by reason of its motion. Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.
Answer ASAP! but only if you know 100%, and whoever gets it right can have brainliest
Answers
Answer:
You could find billions of stars in a galaxy, hope this helps.
The answer is billons, 100 billon to be exact.
Reasoning:If you looked up in the night sky, you'd see so many stars. Everyone else looking up can see them too. Weather they are in Canada, or Flordia. There isnt just 100, or 1000 or 1 millon, there are billons.
Therefore, your answer is D. Billons.
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Give it a thanksGive it a good rating :)This has been..~NatLikesAnime~
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pleeaseeee helllp A geologist finds a large rock containing a fern fossil. This kind of fern grew on land in hot, moist climates.
What does this tell the geologist about the area at the time the rock was formed?
The area was covered by an ocean.
The area was muddy and wet.
The area was hot and tropical.
The area was snowy and cold.
Answers
Answer: The area was hot and tropical.
Explanation:
Can someone explain how they got their answer or how I get the change in number? :(
Answers
Answer:
See Below
Explanation:
Okay, I thinkkk what it is asking by what you summarzied for me issss:
They split the total time into four quarters. They then took (for the first quarter) the start time. Then when the first quarter ends and the second quarter starts is the "end" time.
They then subtract the start time of the second quarter from the end time of the first quarter.
I hope this helps, good luck! :D
What evidence suggests that the ancestors of whales once walked on land?
A.Whales breathe through lungs.
B.Scientists have found fossils of whale-like creature that had legs.
C. Whales have similar DNA to elephants.
D.Whales perform walking motions as they swim.
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Seymour's toy cart was sitting flat on the floor. Seymour started throwing his toys into it.
The cart started to roll away from Seymour.
What made the cart start to move?
Answers
Answer:
the answer is A
Explanation:
The cart is moving because of the force from the toys hitting it
Why did the chicken cross the road?
(excepting any answers)
Answers
Answer:
to get to other side
because it could not be stopped by death
Mike and Mariah are in the same science class. Mike wants to know how the water cycle transports energy and matter. Which of the following examples in Mariah's notebook should she share as the best example of how the water cycle transports both energy and matter?
Water transforms from a solid to a liquid to a gas.
Water transported through the water cycle is never created or lost.
Water vapor precipitates back into the ocean or the land after heating.
Water vapor rises into the air where colder temperatures cause it to condense and form clouds.
Answers
Answer:
Water vapor precipitates back into the ocean or the land after heating.
Explanation:
The water cycle is driven primarily by the energy from the sun. This solar energy drives the cycle by evaporating water from the oceans, lakes, rivers, and even the soil. Other water moves from plants to the atmosphere through the process of transpiration.
The statement which describes the matter and energy transport during water cycle is option c, water vapor precipitates back into the ocean or the land after heating.
What is water cycle ?Water cycle is a geological phenomenon through which the water content in the atmosphere and hydrosphere is balanced. The heat radiated from sun warm up the water bodies make the convection currents that evaporates water.
The water vapor rise to the atmosphere and maintain the air moisture. When this vapor cools down they condense and precipitates as rain, snow or sleek.
This process involves the transfer of heat energy and matter. Here, the matter is water itself with its three phases. Therefore, the statement which describes the matter and energy transfer is option c.
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BRAINLIEST
Now that you have done
some research, write a
hypothesis based on the
relationship between zinnias
and the sun. Write it as an
“If ________, then__________”
statement.
Answers
Answer:
If zinnias are exposed to direct sunlight for a sufficient amount of time each day, then they will grow and bloom more successfully compared to those that do not receive adequate sunlight.
Hope my answer helps you ✌️
Mark BRAINLIEST
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!
EURGENT PLEASE HELP!!!
Select which of the following are outside influences that can affect a researcher’s ability to control an experiment. attrition statistical models selection bias Hawthorne effect history sample population maturation
Answers
selection bias is one of them, i can't tell which words in the options go together though
Now use the temperature change simulation to carry out your experiment. Record your data, as well as any necessary calculations, in the table. You can modify the table, if necessary, so it matches your experimental procedure.
Answers
Answer: Unable to answer.
Explanation: If you link the simulation, I can answer it for you.
A meteor falls toward Earth's surface. Given that the acceleration due to
gravity is 9.8 m/s^2, what is the meteor's potential energy if it has a mass of 10
kg at an altitude of 400 m?
O A. 408 J
O B. 7,840,000 J
O C. 2J
O D. 39,200 J
Answers
Answer:
39,200J
Explanation:
just took the test
The meteor's potential energy if it has a mass of 10kg at an altitude of 400 m will be 39200 J
What is potential energy ?Potential Energy that depend upon the relative position of various parts of system . It is an energy possessed by an object by virtue of its position or configuration.
mass(m) = 10kg
g (acceleration due to gravity) = 9.8m/s^2
altitude(height (h)) = 400m
Meteor's Potential energy = m * g * h
= 10 * 9.8 * 400 = 39200 J
correct option will be a) 39200 J
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How can removing thermal energy afect the state of matter? (Check all that apply)
a). When thermal energy is removed from water vapor the temperature decreases and condensation can occur.
b).When thermal energy is removed from a liquid the particles slow down and a water vapor is formed.
c). When thermal energy is removed from a liquid the temperature decreases, the particles slow down, and freezing occurs forming a solid.
d). When thermal energy is removed from water vapor the particles slow down and evaporation occurs.
Answers
Please help! It has to deal with Newton's 3rd law! 30 points! and if right brainliest!
Answers
Answer:
Newton's Third Law
His third law states that for every action (force) in nature there is an equal and opposite reaction
Explanation:
PLEASE HELP ON QUESTION ASAP !
Hi please help on question.If you get answer correct is be willing to give brainliest,a thanks, five stars and 10pts.
My question:
As an analogy of a circuit with resistance, think of an obstacle race . Which parts of a circuit do the obstacles represent? which part of the circuit do the people respresent?
Answers
In an analogy of a circuit with a resistance to an obstacle race, we can consider various elements of the race as representative of different components of the circuit.Obstacles, Track or Route, Participants, Start and Finish Line.
Obstacles: The obstacles in the race represent the resistors in a circuit. Just as resistors impede the flow of current in a circuit, obstacles in the race create hurdles that slow down the participants. The difficulty or magnitude of the obstacles can be equated to the resistance value of the resistors in a circuit.
Track or Route: The race track or route itself can be seen as the conductive path in a circuit. It provides a pathway for the participants to move and complete the race. Similarly, the conductive path in a circuit allows the flow of current from the power source to the load.
Participants: The people participating in the race represent the flow of electrons in a circuit. Just as the participants move through the obstacles in the race, electrons move through the resistors in a circuit. The rate at which participants complete the race can be compared to the current flowing through the circuit.
Start and Finish Line: The start and finish line of the race correspond to the terminals of a circuit. The start line represents the positive terminal, where the participants begin their journey, and the finish line represents the negative terminal, where the race concludes.
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Answer: As an analogy of a circuit with resistance, the obstacles in an obstacle race represent the resistance in a circuit. The parts of the circuit that the obstacles represent are the resistors. The people in the obstacle race represent the current in a circuit. The current is the flow of charged particles (such as electrons) in a circuit. In an obstacle race, the people are moving through the obstacles, just as the charged particles are moving through the resistors in a circuit. The obstacles slow down the people, just as the resistors slow down the flow of charged particles in a circuit.
Explanation:
Does mars have comet please don't loo k up the answer
Answers
4. The Himalayan Mountains tower as high as 8,854 m above sea level. The rate of plate motion is about 10 cm per year. Use the diagram to explain how the Himalayas formed. Predict how they might look in 10 million years.
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Answer:
Forty million years ago, the continent of India, which was being carried northward by the Indo-Australian plate, collided with Asia forming the Himalayan mountain range (fold mountains). Since the initial encounter, the subcontinent of India has moved 2,000 kilometers farther north at a rate of 5 centimeters a year, sliding beneath Asia as it moves. In 10 million years India will plow into Tibet a further 180km. This is about the width of Nepal.
Answer:Since the initial encounter, the subcontinent of India has moved 2,000 kilometers farther north at a rate of 5 centimeters a year, sliding beneath Asia as it moves. In 10 million years India will plow into Tibet a further 180km. This is about the width of Nepal.
Convection currents not only in the Earth's core but in what?
A. Only liquids
B. When a dense substance is warmer than a less dense substance
C. In both liquids and gases
D. Weakly in solids
Answers
Answer:
B. When a dense substance is warmer than a less dense substance
Explanation:
I'd like some help in these two questions please, thankyou so much. have a great day! stay safe and stay happy. (there are two parts of one question so uh yea.
Answers
Answer:
The resultant force is 25 N in the negative x-direction.
Explanation:
We need to find the total force in the x and y-direction and then the resultant force will be the magnitude of the sum of Fx and Fy.
Total force in the x-direction:
\(F_{x}=12-37=-25\: N\)
Total force in the y-direction:
\(F_{y}=10-10=0\: N\)
Therefore, the magnitude of the resultant force will be:
\(F_{R}=\sqrt{F_{x}^{2}+F_{y}^{2}}\)
\(F_{R}=\sqrt{(-25)^{2}+0}\)
\(|F_{R}|=25\: N\)
The resultant force is 25 N in the negative x-direction, in other words, the car will move to the left.
I hope it helps you!