Answer:
1.) h = 164.8 m
2.) U = 49.1 m/s
3.) t = 1.43 seconds
Explanation:
1.) A soccer ball is dropped from the top of a building. It takes 5.8 seconds to fall to the ground. The height of the building is...?
Since the soccer ball is dropped from the building, the initial velocity U will be equal to zero
Using second equation of motion
h = Ut + 1/2gt^2
Substitutes the time into the formula
h = 1/2 × 9.8 × 5.8^2
h = 164.8 m
2. The Falcon 9 launches to a height of 123 meters. What is its vertical initial velocity?
At maximum height final velocity = 0
Using the third law of motion
V^2 = U^2 - 2gH
0 = U^2 - 2 × 9.8 × 123
U^2 = 2410.8
U = 49.1 m/s
3. An apple falls from rest off a 10.m m tree. How long will it take before it hits the ground?
Since the apple fall from rest, the initial velocity U will be equal to zero
Using the second equation of motion,
h = Ut + 1/2gt^2
substitute all the parameters into the formula
10 = 1/2 × 9.8 × t^2
10 = 4.9t^2
t^2 = 10/4.9
t^2 = 2.04
t = 1.43 seconds
In her dissertation research, a graduate student finds a correlation of +0.95 between two of the variables being studied. How should she interpret this correlation coefficient
Answer:
Explanation:
A correlation of +0.95 between two variables signifies a strong positive relationship between the two measured variables (the dependent and independent). The value is usylay called the correlation Coefficient (r) as it measures the level or degree of relationship or correlation between two measured linear variables. The value ranges between - 1 and +1 with + signifying a positive relationship (increase or decrease in one variable leads to corresponding increase or decrease in the other) while a negative correlation means (a decrease in A leads to increase in B and vice versa). A correlation Coefficient of 0 means no relationship and the strength of the relationship increases as the value approaches - 1 or +1.
A car accelerates from rest to 90m/s in 3 seconds. What is the acceleration and how far did it travel?
Answer:
Explanation:
1.)acceleration= final velocity-initial velocity/time
90m/s-0m/s /3seconds
=30m/s^2
2.) distance= speed*time
90m/s*3seconds
=270m
1) Describe the motions of the moon relative to the Earth and the sun. Explain how this causes us to see phases of the moon, and identify these phases by name.
Answer:
Explanation:
The moon is a natural satellite of the earth, which performs rotational and revolutionary motions simultaneously. As the earth rotates about its axis, the moon rotates round it. But revolves round the Sun, as the earth also revolves round the Sun.
The motion of the moon causes series of its phases. Some major phases of the moon are, new moon, 1st quarter, full moon, and 3rd quarter (last quarter).
Since the moon reflects the light from the Sun, the face of the moon reflecting the light from the Sun changes gradually with respect to its motion.
At new moon, the face of the moon reflect no light. But reflects 100% at full moon. While both 1st and 3rd quarters show partial reflections.
Does the horizontal distance d travelled by the ball depend on the height of release? If it does depend on the height, what is the mathematical relationship between the variables
Answer:
Explanation:
Yes , the horizontal distance travelled by the ball will depend upon the height of release .
When a ball is thrown at some angle from a height , it has two components , the vertical component and horizontal component . The ball goes in horizontal direction due to its horizontal component . Its vertical component has no role to play . But the horizontal range covered by the body thrown
depends upon the duration of time in which it remains in air . The longer it remains in air , the greater distance it can cover horizontally .
Horizontal distance covered = t x horizontal velocity
If V be the velocity of throw and Vx be its horizontal component
Horizontal distance covered = t x Vx
Now t depends upon the height . If height rises , time of fall will increase so horizontal distance covered will increase .
If h be the height from which the body is thrown , Vy be the vertical upward component of initial velocity
from the relation
s = ut + 1/2 at²
h = - Vy t + 1/2 at²
As h increases , t will increase and therefore horizontal distance covered will increase. If the ball has only horizontal velocity initially , Vy = 0
h = 1/2 gt²
[tex]t = \sqrt{\frac{2h}{g} }[/tex]
Horizontal distance covered = t x Vx
= [tex]\sqrt{\frac{2h}{g} } \times V_x[/tex]
From this expression also
Horizontal distance covered is proportional to [tex]\sqrt{h}[/tex] .
PLEASE HELP BALANCED AND UNBALANCED FORCE QUESTION
Answer:
YW
Explanation:
A ball rolls at a speed of 6cm/s how far does the ball roll in 40 seconds ? ____cm
Please help Its due in ten minutes
Here you go, hope this helps you.
If you are facing north, then east is to your
Answer:
The real answer is right
Explanation:
What part of physics are you looking forward to the most?
Answer:
all of it
Explanation:its cool
25 POINTS!! ANSWER CORRECTLY FOR BRANLIEST!
Which of the following statements describes an interaction between the atmosphere and biosphere?
Water and its vapor move through air.
Earth's internal heat warms the layer of air around it.
Oceans provide an environment for sustaining marine life.
Life is possible on Earth due to layers of air that surround it.
Answer:
the answer is probably most likely D first and if thats incorrect than its B
♡ Hope it helps♡
How to solve 5,897,159 milligrams into kilograms?
Answer:
5.897159 kilograms
Answer:
5.897159 kilograms
Explanation:
5,897,159÷1000000=5.897159
Why water is not used as a thermometric liquid?
Answer:
Explanation:There are many reasons why water is not used as a thermometric liquid (or is less preferred), chief among which is its transparency. It is thus comparatively harder to make any readings with it. It also has a lower boiling and higher freezing point compared to most liquids.
name the fundamental units involved in pascal
Explanation:
Hey there!
Here,
Pascal is a unit of pressure.
[tex]pressure = \frac{f}{a} [/tex]
Now, As per the formula the units are:
kg, m and s^2.
Hope it helps...
a body has got its mass 100 kg .calculate it's weight
Answer:
220.46 lbs
Multiply the mass by 2.205 for an approxinate result.
The answer is 220.462.
PLEASE HELPP MEEE
5. While you're ice-skating with your friends, you push off from one end of
the rink and slide forward. Based on Newton's first law of motion, what
is true?
A. You will lose your balance and fall over before you reach the middle of
the ice rink
B. You will continue to slide across the ice until a force makes you stop or
change direction
C. The force of gravity will make you keep your velocity until your friends
make you stop
D. The size of your ice skates will determine how quickly or slowly you
travel across the ice
ype here to search
Answer:
B
Explanation:
Newton's 1st law of motion is anything that is at rest remains at rest and anything in motion remains in motion so you will continue to slide until you come into contact with the opposite wall or another force.
Can someone please help me. I think it D but I wanna make sure kk and thank you What is the main purpose of an scientific investigation A) to persuade with bias B) to teach an lesson C) to form an opinion D) to test a hypothesis
Answer: I believe it to be D.
which term describes the energy an object has because of its motion? Potential Nuclear Kinetic Thermal
Answer:
The answer is Kinetic Energy
Explanation:
Kinetic energy is the term describes the energy an object has because of its motion. Option C is correct
What is kinetic energy?The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.
KE =1/2mv²
Where,
m is the mass
KE is the kinetic energy
v is the velocity of the body
The word "kinetic energy" refers to the energy that an item possesses as a result of its motion.
Hence option C is correct.
To learn more about kinetic energy refer to the link;
https://brainly.com/question/999862
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PLEASE HELP A car accelerates from rest at 2.92 m/s2 What is the velocity at the end of 5.1 s? Answer in units of m/s. What is the displacement after 5.1 s? Answer in units of m.
Answer:
first you have to organize the data. a=acceleration t=time v0=inicial velocity vf=final velocity
a=2.92m/s2
t=5.1s
vf=?
v0=0
now the formula you have to use is: vf=vi+a*t (final velocity equals to inicial velocity plus acceleration times time)
Explanation:
i was the best at my class, hope it helped
Yvette drops her cell phone as she is getting out of the truck one day she noticed that the cell phone fell 1.5m to the ground how fast was the phone moving right before hitting the ground
Answer:
The speed was 5.42 m/s
Explanation:
The height of fall of the phone s = 1.5 m
The phone was at rest in her hand, so the initial velocity u = 0 m/s
The velocity right before the phone strikes the ground v = ?
Using the equation
[tex]v^{2}[/tex] = [tex]u^{2}[/tex] + 2gs
where
g is the acceleration due to gravity = 9.81 m/s^2
substituting values, we have
[tex]v^{2}[/tex] = [tex]0^{2}[/tex] + 2(9.81 x 1.5)
[tex]v^{2}[/tex] = 29.43
v = [tex]\sqrt{29.43}[/tex] = 5.42 m/s
If a boat travels 20 km in 3 h due north, what is the boat’s average velocity?
Answer: 6.66666667 or 6.66 km per hour
Explanation: (velocity = distance÷time) or (v=d÷t)
What is the distance a bike travels at 38 km/he for 4.5 seconds?
Answer:
2.36m/s
Explanation:
first you have change 38km/hr into m/s
then divide your answer with 4.5
A team of seven psychologist is study love, but each psychologist is working from a different perspective. In your opinion, what might each pyschologist stufy?
Answer:
- Behavioral Psychologists
- Psychodynamic Psychologist
- Biological Psychologist
- Cognitive Psychologist
- Evolutionary Psychologist
- Socio - Cultural Psychologist
- Humanist Psychologist
Explained in explanation section
Explanation:
There are different classes of psychologists but for the purpose of this question we need just 7 that would fit into the study of love. These 7 will be;
1) A behavioral Psychologist might study behaviors associated with love, such as hugging, caressing or kissing.
2) A psychodynamic psychologist might study how a people's challenges with love are caused by unmindful and unresolved conflicts.
3) A biological psychologist might study which chemicals in the brain such as dopamine make people feel loved. He might also study parts of the what parts of the brain are active when people are in love.
4) A cognitive psychologist might study how people's cognitive processes will change when they are in love.
5) An evolutionary psychologist might study how certain actions or behaviors associated with love provided our forefathers with sufficient knowledge to handle their love problems.
6) A sociocultural psychologist might study how people express love in in various cultures across the world.
7) A humanistic psychologist might study the behavior of those who feel most loved and the impact it has in their lives
Answer:
A psychodynamic psychologist might study how a person's problems with love are caused by unconscious, unresolved conflicts. A behaviorist might study observable behaviors associated with love, such as hugging or kissing. A cognitive psychologist might study how a person's cognitive processes change when one is in love.
Explain why the cyclist must be fed in order to continue to pedal? answer fast please
The cyclist must be fed in order to continue to pedal because food will
provide him/her with energy to continue with it.
Cycling and other forms of activities involve the use of energy by the body ton perform them and the energy dwindles with time which is why we eat everyday to gain more energy.
The cyclist will have to eat foods such as carbohydrates so as to have more
energy to continue to pedal.
Read more on https://brainly.com/question/17404321
A jogger runs 3 miles east then 7 miles west what is her displacement
Answer: 4 miles.
Explanation:
Let's use the rectangular coordinates (x,y)
And define:
East as the positive x-axis.
North as the positive y-axis.
We know that, if the jogger starts at the point (0mi, 0mi):
"Runs 3 miles East"
Then the new position is (3mi, 0mi)
"Then 7 miles west"
The new position is (3mi - 7mi, 0mi) = (-4mi, 0mi)
Now, the displacement is calculated as the difference between the initial position and the final position, and this can be written as:
D = I (-4mi, 0mi) - (0mi, 0mi)I = √( (-4mi - 0mi)^2 + (0mi - 0mi)^2) = 4mi
The total displacement is 4 miles.
Which of the following is a result of the transfer of energy?
- gravity
- matter
- magnetism
- sound
Answer: Sound
Explanation: it's asking which of the following is a result of transfer of energy and sound comes from vibrations
The difference between the two molar specific heats of a gas is 8000J/kgK. If the ratio of the two specific heats is 1.65, calculate the two molar specific heats.
Answer:
sorry
Explanation:
pls search on google
Under most conditions, except ________ change, the resistance of an object is a constant and does not depend on the amount of the voltage or the amount of current passing through it.
Answer:
Temperature change
Explanation:
PLEASE HELP ANSWER THIS WORKSHEET IT'S DUE TODAY WILL GIVE BRAINLIEST BALANCED AND UNBALANCED WORKSHEET
Answer:The net force for A. Is 2 and the resultant motion is up
B. NET force: 2 resultant motion: left
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C. Net force: 3 Resultant motion: Left
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D. Net Force: 7 Resultant motion: right
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E. Net Force:0 resultant motion: NO MOTION
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F. NET Force: 3 resultant motion: Down
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G. NET FORCE: 10 resultant motion: up
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H. Net force: 3 Resultant motion: left
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I. Net force: 50 Resultant motion: right
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J. NET FORCE: 75 Resultant motion: down
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K. Net force :200 Resultant motion: Right
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L. force: 0 resultant motion:No motion
Explanation:
What is the unit measure for energy
Answer:
unit measure of energy is joule
Answer:
unit of energy measurement is joule
The unit meters corresponds to what variable
Do you have any options? My guess would be distance but I could be wrong.