Answer: 20.4 m
Explanation: [tex]\frac{9.8^{2} }{Velocity} = Max Height[/tex]
The answers to this test are:
1. What is the maximum speed when the conditions are mass = 450 kg, initial height = 30 m, and the roller coaster car is initially at rest?
24.2 m/s
2. A computational model predicts the maximum height that a roller coaster car can reach when the lowest height of its journey is at ground level, where it has a speed of 20 m/s. Given these conditions, what is the maximum height?
20.4 m
3. A computational model predicts the speed of a roller coaster car at different heights given its speed at the lowest height of its journey, which is at ground level. The speed at the lowest point is 30 m/s. What is the prediction for its speed when it is at a height of 20 m?
22.5 m/s
4. A computational model predicts the maximum potential energy a roller coaster car can have given its mass and its speed at the lowest point of its journey. Its mass is 350 kg, and it speed at a height of 0 m is 25 m/s. What is the prediction for its maximum potential energy?
109,375 J
5. What is the benefit of using simple computational models in a spreadsheet application, like the one used in this course, to predict mechanical energy and related values?
It is easy to calculate new scenarios.
In Part I of this experiment, the______was intentionally manipulated. This was the independent variable. The dependent variable measured was the _______.
In Part II of this experiment, the______was intentionally manipulated. This was the independent variable. The dependent variable measured was the_______.
Answer:
1. car hitting a barrier 2. velosity of the washer 3. force applied to the car 4. acceleration of the car.
Explanation: edge 2020
why because nice
Answer:
1: car hitting a barrier
2: velocity of the washer
3: force applied to the car
4: acceleration of the car
Explanation:
force can change the ____________ and _______________ of an object
Answer:
Force can change the speed and direction of an object.
Explanation:
Why does air move from solid land towards water during the night?
A-Solid ground cools faster at night while water remains heat longer, warming the air above the water.
B- The ground retains the heat from the sun longer than the water.
C- The dry air over the land is heavier than the air over the water the contains more water vapor
D- gravity moves the air towards the water because water is lower than the land
Answer:
A
Explanation:
This is to do with convection currents :)
Hope this helps!
Why is “soft” iron used for the core of an electromagnet?
It is difficult to magnetize.
It has no magnetic domains.
It is a permanent magnet.
It is easily magnetized.
Answer:
It is difficult to magnetize.
How are electric motors and generators similar? 
Answer:
they both produce energy
Explanation:
pls help me this is being timed.
Answer:
Increase air resistance
Explanation:
Gravity forces the parachute down but air resistance pushing up on the flat surface of the parachute causes it to fall slower to the ground.
PLEASE HELP MEE I REALLY NEED IT
Answer:
measures of central tendency are numbers that describe what an average or typical within a distribution of data there are three main measures of central tendency mean medium and mold well they are all measuring essential tendency each is calculated differently and measures something different from others
What are the strengths and limitations of the doppler and transit methods? What kind of planets are easiest to detect with each method?
help me please :( i will but brainliest
[tex]\huge\mathfrak\red{✔Answer:-}[/tex]
Strength: able to detect planets in a wide range of orbits, as long as orbits aren't face on
Limitations: yield only planet's mass and orbital properties
What happened when the solid sulfur was melted?
Answer:
Sulfur is a COMBUSTIBLE SOLID. ... Molten Sulfur reacts with HYDROCARBONS to form toxic and flammable gases such as Carbon Disulfide and Hydrogen Sulfide).
Explanation:
What is the force acting on a 16 kg object accelerating at 2.0 m/s^2
Answer:
32 N
Explanation: All you gotta do is multipy mass by velocity.
A 30 N rock falls from a 40 m cliff. At what point during its fall are its
potential and kinetic energies equal?
Answer:
Both energies are equal when the rock has fallen 20 m or equivalently when it is at a height of 20 m.
Explanation:
Potential and Kinetic Energy
The gravitational potential energy is the energy an object has due to its height above the ground. The formula is
[tex]U=mgh[/tex]
Where:
m = mass of the object
g = acceleration of gravity (9.8~m/s^2)
h = height
Note we can also use the object's weight W=mg into the formula:
[tex]U=Wh[/tex]
The kinetic energy is the energy an object has due to its speed:
[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]
Where v is the object's speed.
Initially, the object has no kinetic energy because it's assumed at rest.
The W=30 N rock falls from a height of h=40 m, thus:
[tex]U=30*40=1,200 J[/tex]
Since the sum of the kinetic and potential energies is constant:
U' + K' = 1,200 J
Here, U' and K' are the energies at any point of the motion. Since both must be the same:
U' = K' = 600 J
U'=Wh'=600
Solving for h':
[tex]\displaystyle h'=\frac{600}{W}=\frac{600}{30}=20~m[/tex]
Both energies are equal when the rock has fallen 20 m or equivalently when it is at a height of 20 m.
What happens to the angle of reflection with respect to the angles of incidence?
Please help ASAP
Will give you 15 points !!!
Answer:
The law of reflection states that the angle of reflection equals the angle of incidence—θr = θi. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface.
Explanation:
How fast is a plane flying if it takes 3 hours to travel 3,500 km?
Answer:
1166.67 km/h
Explanation:
3500/3
= 1166.67 km/h
Hope this helped!
Answer:
HELPP
Explanation:
Do you need a reason to live? If you do what is your reason for living?
Answer: Well that's an easy one. Your mother birthed you but you are still alive today because you choose to continue to push forward and strive to live. As humans we all have struggles but some of choose to strive or sit in our humiliation like a kicked puppy. Pick your option.
Who ever answers Frist get marked the Brainly Est
the table below shows the right ascensions of two stars at a location.
Name of star Right ascension
Star 1 2 hours
Star 2 4 hours 30 minutes
What is the interval between the times when the two stars rise at the location? (10 points)
Group of answer choices
2 hours
30 minutes
2 hours 30 minutes
4 hours 30 minutes
Answer:
Explanation:
It would actually be A. 30 , as each hour of ascension (i am not sure about the correct terminology) equals 15 .
Answer:
30
Explanation:
70 Joules of work are done pushing a cart 3.5 meters across the floor.
What average force was applied to the cart while this work was done? *
Answer:
20
Explanation:
force=work done÷distance
Convert i) 1 microgram into kilogram
ii) 100 decameter into cm
Answer:
1×10^-9kilogram
100 decameter =100000cm
Answer:
1 microgram into kilogram
1000000000microgram=1kilogram
1 microgram:1/1000000000kilogram
and
100 decameter into cm
1decameter:1000cm
100 decameter :100000
if a tree falls in the woods and nobody is there to hear it, does it really make noise
Answer: Yes
Explanation: Because, Yes.
A marble is thrown horizontally with a speed of 7 m/s. When the marble lands, it hastraveled a horizontal displacement of 30 m. How much time was the marble in the air?
Answer:
t = 4.28 s
Explanation:
The horizontal speed of a marble = 7 m/s
The horizontal displacement covered by the marble = 30 m
We need to find the time for which the marble is in air. Let the time is t. Using the formula for speed to find it as follows :
[tex]s=\dfrac{d}{t}\\\\t=\dfrac{d}{s}\\\\t=\dfrac{30\ m}{7\ m/s}\\\\=4.28\ s[/tex]
So, it will in the air for 4.28 s.
I WILL GIVE BRAINLIEST (This question will give you 15+ points)
3. Explain and give an example of "lookback time".
Answer:
Lookback time explains that the farther away something is, farther in the past we see it. The Sun's light takes about 8 minutes to reach our eyes. So in reality, we see the Sun as it was 8 minutes ago.
Explanation:
How did the gas & dust between the starts & in all corners of the universe get there
Can somebody please explain to me about the rock cycle anything would help i have an assignment coming up please and thank you
A free-body diagram is a special example of the vector diagrams that will
be used throughout our study of physics.
True
or
False
WILL MARK BRAINLIEST The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.
Which arrow represents the change of state described above?
1.L
2.M
3.N
4.O
Answer:
its a top question
I think L represents ✌️
1) L
Explanation:
During the solid form are atoms close to eachother and can't move around too much. A gas can fill up a container while a liquid just takes the form of a container.
How many seconds will it
take to travel 1,800
meters if your speed is
90 meters per second?
Answer:
200 seconds
Explanation:
1,800 divided by 90 = 200
PLEASE HELP ME FAST MANY POINTS BRAINLIEST TO BEST
What is pitch related to in terms of sound? Does it affect its speed? If so, how?
Answer:
pitch relates to sound because it involves sound getting louder or softer. it does not affect speed.
a. What is the coefficient of kinetic friction?
Explanation:
Coefficient of kinetic friction is the resistive force that opposes the motion of a body as it moves and is in contact with another body.
It is found by dividing the frictional force by the normal force.
Friction is a force that opposes motion. Static friction is for bodies that are not in motion Kinetic friction is for moving bodies.Light is ______________ that behaves like a wave and a particle
Answer:
Energy
Explanation:
When you walk on a floor, what pushes you
along?
Answer:
In order to walk across the floor, you push backwards on the floor with your foot. Newton's Third Law says that the reaction force to this action force is "floor pushes you forward" (Action: You push floor (backwards). Reaction: floor pushes you (forward).) So, when you walk, it is the floor that pushes you along!
Explanation:
.
Question 1 of 16
A bowling ball with a mass of 8 kg is moving at a speed of 5 m/s. What is its
kinetic energy?
Answer:
mass energy
Explanation:
because of the kinetic energy
