Answer:
The primary reason of seeing the cracker burst and hearing the sound later is because the speed of sound and light. Speed of light is in the vicinity of 3*10^8m,/ sec while the speed of sound is at a distance of 332m/sec. It is similar to lightning that strikes before the sound.
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The acceleration due to gravity on the Moon is gM. Suppose an astronaut on the Moon drops an object from a height of H. The time it would take the object to reach the Moon’s surface would be TM. The same object is dropped from the same height on Earth, where the acceleration due to gravity is gE. The time it takes the object to reach the Earth’s surface is TE. Which of the following is a correct mathematical relationship for the two times?
TE=gEgM−−−√TM
TE=gEgMTM
A
TE=gMgE−−−√TM
TE=gMgETM
B
TE=gEgMTM
TE=gEgMTM
C
TE=gMgETM
TE=gMgETM
D
TE=TM
The relationship between the two times is [tex]TE = TM\sqrt{\frac{gM}{gE} }[/tex]
The given parameters:
the acceleration due to gravity on the Moon = gM
height from which the object was dropped on moon, = H
time taken for the object to reach the moon surface, = TM
height from which the object was dropped on Earth, = H
the acceleration due to gravity on the Earth = gE
time taken for the object to reach the Earth's surface = TE
To find:
The relationship between the two times:Apply the following kinematic equation:
[tex]H = ut + \frac{1}{2} gt^2\\\\we \ know \ nothing \ about \ the \ initial \ velocity \ u , let \ u = 0\\\\H = \frac{1}{2} gt^2\\\\[/tex]
Height equation for the object on the moon:
[tex]H = \frac{(gM) TM^2}{2}[/tex]
Height equation for the object on the Earth:
[tex]H = \frac{(gE) TE^2}{2}[/tex]
Since the two heights are equal, set the two equation to be equal to each other to determine the relationship between the two times:
[tex]\frac{(gE)TE^2}{2} = \frac{(gM)TM^2}{2} \\\\(gE)TE^2 = (gM)TM^2\\\\make \ TE \ the \ subject \ of \ the \ formula;\\\\ TE^2 = \frac{(gM)TM^2}{gE} \\\\TE= \sqrt{\frac{(gM)TM^2}{gE} } \\\\TE = TM\sqrt{\frac{gM}{gE} }[/tex]
Thus, the relationship between the two times is [tex]TE = TM\sqrt{\frac{gM}{gE} }[/tex]
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An airplane is seller rates down a runway at 3.10 M/S squared 441.5 seconds from rest until finally left off the ground ,what is the displacement before takeoff
Answer:
302129m
Explanation:
Using s= ut + 1/2at²
But u= 0
So
S= 1/2(3.1)(441.5)²
=302129m
What do the planets have in common and how are they different?
Answer:
They vary quite a lot, yet there are some similarities
Explanation:
With Mercury, you have a hot and barren expanse of rock
With Venus, you also have a fairly hot and barren expanse of rock, with a molten core
With Earth, you have a warm/cool variant with water and a full atmosphere
With Mars, you have a colder and barren expanse of valleys and rock, with a rather paste-like ground
With Jupiter, we have our first gas giant, covered in clouds with a thick atmosphere
With Saturn, it is yet another gas giant, with rings of gas and rock and a dense core of metals, such as iron and nickel
With Uranus, it is also rather gas-full with a fair amount of water and methane, which results in its bluish color (an ice giant)
And finally with Neptune, it is the other ice giant, consisting of water, methane, and ammonia
So there are some similarities (gases, water, land formations, etc.) and some differences (rings, temperature, structure, etc.). Our planets are very unique to one another and continue to engage and surprise us.
Why does a green leaf look green in our eyes
Answer:
because the leaf absorbs all the other colors except for green. So the leaf reflects the green color which is what we see. that is why a leaf spears to be green.
Explanation:
floor gang aooh sub to pewdiepie
In a science demonstration, a teacher mixed zinc (Zn) with hydrogen chloride (HCl) in a flask and quickly attached a balloon over the mouth of the flask. Bubbles formed in the solution and the balloon inflated.
What most likely occurred during this demonstration?
:The Zn and HCl both retained their identity.
:Either Zn or HCl, but not both, retained its identity.
:Evaporation of one of the substances occurred.
:One or more new substances formed.
Answer:
d
Explanation:
When a teacher mixed zinc (Zn) with hydrogen chloride (HCl), one or more new substances formed. Hence, option (d) is correct.
What is chemical reaction?A chemical reaction is a procedure that causes one group of chemical components to change chemically into another.
Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present).
The study of chemical processes involving unstable and radioactive elements, where both electronic and nuclear changes may take place, is known as nuclear chemistry.
When the teacher mixed zinc (Zn) with hydrogen chloride (HCl), chemical reaction happens and more than one new substances formed.
2Zn + 2HCl → 2ZnCl + H₂
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How can the force of friction between two surfaces be reduced?
a. By changing rolling friction to sliding friction.
b. By making smooth surfaces rougher.
c. By separating surfaces with a lubricant.
d By increasing the force between the surfaces.
PLEASE HELP ASAP!!!!
T1 = 2×W / squrt (3) +1
T2 = squrt(6) ×W/ squrt (3) +1
Here, T1 is along A.
T2 is along B
W = 250N.
Yo can directly use above formula to find solution.
The graph shows the motion of a lift starting at rest and initially moving upwards: What is the acceleration of the lift between 0 and A?
Answer:
0.67 m/s²
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 0 m/s
Final velocity (v) = 2 m/s
Time (t) = 3 secs
Acceleration (a) =?
Acceleration can be defined as the rate of change of velocity with time. It can be represented mathematically as:
Acceleration = change in velocity /time.
a = (v – u) /t
With the above formula, we can calculate the acceleration of the lift as shown below:
Initial velocity (u) = 0 m/s
Final velocity (v) = 2 m/s
Time (t) = 3 secs
Acceleration (a) =?
a = (v – u) /t
a = (2 – 0) /3
a = 2/3
a = 0.67 m/s²
Thus, the acceleration of the lift between 0 and A is 0.67 m/s².
A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.
A - what is the zero error of the micrometer?
B - what is the correct diameter wire?
A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.The correct answer should be the micrometer.
What is micrometer?The micrometer is an instrument that is capable of measuring the component of an object to very high precision. It is used to obtain accurate measurements in engineering.
In the case of the copper wire, the diameter of 0.3 mm was an approximation and a more accurate measure of the diameter would be obtained by using the micrometer.A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.The correct answer should be the micrometer.
Therefore, A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.The correct answer should be the micrometer.
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Starting from rest, a truck accelerated at a rate of 2 m/s to the right for 25 seconds. How far will the truck travel during this time period
Answer:
S= ?
V=2m/sec
t=25s
S=V*t
S=2*25
S=50m
Which pair of quantities represent scalar quantities, and how are they different from vector quantities?
A. energy and velocity
B. displacement and velocity
C. displacement and time
D. distance and time
D.
They don't have directions.
The quantities with only magnitude and no direction are called scalar quantities. Therefore, option D is the correct answer.
Scalar quantities have only magnitude but vector quantities have both magnitude and direction. Some examples of scalar quantities are,
• Mass
• Temperature
• Speed
• Density
Thus, we conclude that the quantities with only magnitude and no direction are scalar quantities. Hence option D is the correct pair.
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Multiple Choice
Which of the following was not required by the Massachusetts Education Law of 1642?
O
Children were to be educated in basic religious principles and the laws of the commonwealth.
O Children were to be able to read and write.
O Children of servants were included in the law as recipients of said education.
Children were to be sent to designated schoolmasters for their learning.
Answer:
What was not required by the Massachusetts Education law of 1642 is;
Children were to be sent to designated schoolmaster for their learning
Explanation:
The Law of 1642 required that parents and master see to it that their children knew the principles of religion and the capital laws of the commonwealth.
The important aspects of the 1642 Law includes;
1) The responsibility for the basic education and literacy of a child are those of the parents and masters of child apprentices
2) Reading and writing competency of all children and servants are a requirement
3) It is the duty of the government, where a parent or master are unable to meet their tutoring responsibility, to see that a child is placed where the basic educational requirement will be met.
The role of a schoolmaster or the setting of a formal school were yet to be formed as at that time.
Answer:
The correct answer is Children were to be sent to designated schoolmasters for their learning
The responsibility of educating children was on parents and apprenticeship masters, not on designated teachers or schoolmasters. However, the law did allow the government to step in if the supervising adults failed in their responsibilities.
Explanation:
whats the average velocity
Answer:
A velocity is a vector unit, and average velocity can be described as the displacement divided by the time. The units for velocity can be understood from the definition to be meters/second or in common any distance unit over any time unit. The average speed of a body is described as the distance covered divided by the time elapsed.
Explanation:
the force of speed
Answer:
10 m/s
Explanation:
The average velocity is the slope of the graph.
m = (10 - 0)/(1 - 0)
m = 10/1
m = 10 m/s
convert 288cm to Meters
Give explanation + formula
Answer:
288 cm is 2.88 meters. This is because each centimeter is 1/100th of a meter, or in other words, each meter is 100 cm. To find out cm-m, divide the amount of cm by 100 and change the unit to m.
Explanation:
formula is cm/100=m
288/100= 2.88m
A train travelled 500 meters in 25 seconds
[tex]\huge\mathfrak\red {Answer:}[/tex]
Speed = Distance/TimeIf a train travelled 500 meters in 25 seconds then,
Speed = 500m/25sec
→ 20 m/sec[tex]\mathfrak\purple {Hope\: this\: helps\: you...}[/tex]
speed=500m/25sec
20m/sec
Solve.
(3.0 × 107)x (1.5 × 103)
Answer:49594.5
Explanation:
explain at least two differences between justice system laws and scientific laws.
Position vs Time
20
15
10
B
5
C
position (m)
0
D
-5
-10
-15
E
20
0 1 2 3
8
9
10
11
12
4 5 6 7
time (sec)
401320
Answer:
20
15
10
B
5
C
position (m)
0
D
-5
-10
-15
E
20
0 1 2 3
8
9
10
11
12
4 5 6 7
time (sec)
Explanation:
okk
a 50-kg object moving at 12 m / s has a momentum of 600 kg m / s what is the mass of an object moving at 4 m/s has the same momentum
Explanation:
p=mv
600kgms-1=m × 4ms-1
m=600kgms-1/4ms-1
m=150kg
The mass of the object which has momentum of 600kgm/s with the velocity of 4m/s is 150kg.
What is Momentum?Momentum is the product of the mass and velocity of the object. Momentum is the quantity of motion which is made up of the amount of matter moved and the velocity at which it moves. Momentum is a vector quantity because it has both the magnitude and direction. The SI unit of momentum is kg.m/s (kilogram meter per second).
p = m × v
p = momentum of the object,
m = mass of the object,
v = velocity of the object
600kgm/s = m × 4m/s
m = 600/ 4
m = 150kg
Therefore, the mass of the object will be 150kg.
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Which of these objects could be falling with constant acceleration?
Answer:
1 and 2
Explanation:
If an object has constant acceleration, it's displacement at time t is:
Δx = v₀ t + ½ at²
For object 1:
0.44 = (0) (0.3) + ½ a (0.3)²
a = 9.78
3.14 = (0) (0.8) + ½ a (0.8)²
a = 9.81
So object 1's acceleration is approximately constant.
For object 2:
0.06 = (0) (0.3) + ½ a (0.3)²
a = 1.33
3.09 = (0) (2.1) + ½ a (2.1)²
a = 1.40
So object 2's acceleration is approximately constant.
For object 3:
0.44 = (0) (0.3) + ½ a (0.3)²
a = 9.78
3.09 = (0) (2.1) + ½ a (2.1)²
a = 1.40
So object 3's acceleration is not constant.
What does the acronym B.E.E.F. stand for?
Question 5 options:
box-out, elbows out, energize, follow-through
balance, engage, eyes, field goal
block, engage, eyes, free-throw
balance, eyes, elbow in, follow-through
The defense is the team that has possession of the basketball, and is trying to score points.
Question 6 options:
True
False
Question 7 (5 points)
The bounciness of a basketball is most important for which action?
Question 7 options:
Shooting
Passing
Dribbling
Stealing
Question 8 (5 points)
What can you infer about why certain shots are worth three points, and others are only worth two?
Question 8 options:
Three-point shots are taken from longer distances, so they're harder to make
Three-point shots reward players for not committing fouls when they shoot
Three-point shots require shooters to battle through more defensive pressure than two-point shots
Three-point shots can only be taken by guards, while two-point shots can be taken by any player
Question 9 (5 points)
How are free throws different from ordinary shots?
Question 9 options:
They only occur late in games
They're taken by defensive players, not offensive players
They cannot be rebounded
They're each worth one point instead of two or three
Question 10 (5 points)
A player with the basketball has to dribble the ball to be able to move around.
Question 10 options:
True
False
Question 11 (5 points)
All shots in basketball are worth two points.
Question 11 options:
True
False
Question 12 (5 points)
Which skill is least useful on defense?
Question 12 options:
Speed
Strength
Passing Ability
Jumping Ability
Question 13 (5 points)
Who is the inventor of basketball?
Question 13 options:
James Naismith
John Bradshaw
Jerry West
Joe Namath
Question 14 (5 points)
What conclusion can be drawn from the fact that many of the best international players want to play in the NBA?
Question 14 options:
It's easier to join NBA teams than teams in other countries
Many of these players have never been to the United States
Basketball isn't very popular outside the United States
The NBA is the most competitive league in the world
Question 15 (5 points)
Which action is taken only by teams on offense?
Question 15 options:
Rebounding
Blocking
Stealing
Shooting
Question 16 (5 points)
A free-throw is a one point shot from the foul line.
Question 16 options:
True
False
Question 17 (5 points)
Finger-pads, waist level, and eyes up are cues for what skill?
Question 17 options:
Shooting
Stealing
Dribbling
Passing
Question 18 (5 points)
A person should step toward their target when passing the basketball.
Question 18 options:
True
False
Question 19 (5 points)
Any illegal physical contact to a basketball player is a foul.
Question 19 options:
True
False
Question 20 (5 points)
It is important to keep the _________ in when shooting the basketball.
Question 20 options:
Ankle
Foot
Knee
Elbow
Answer:
balance, eyes, elbow in, follow-through
Explanation:
A Force of 20N displaces a body about 45m how much work is done?
Answer:
159 ofc
Explanation:
When velocity is positive and acceleration is negative, what happens to the object’s motion?
a The object speeds up.
b The object remains at rest.
c Nothing happens to the object.
d The object slows down.
Answer:
Option (D) : The object slows down.
6.P.2.1 Matter: Properties and Changes Notes
The Theory ______
of Conservation
of
states:______
cannot be
or!____________
height
is anything that has
(weight) and height
(takes up space).
A
is the
in an object.
is the
an object takes
to add speaker notes
Answer:
The __law__ conservation
of state that either energy may produced nor destroyed
_________________ are labels for ranges of weight that are greater than what is generally considered healthy for a given height.
A. Overweight and obesity
B. Overweight and morbidity
C. Obesity and diabetes
D. Obesity and heft
Answer: A. Overweight and obesity
Explanation:
Overweight and obesity are labeled for ranges of weight that are greater than what is generally considered healthy for a given height. Hence, option A is correct.
What are Overweight and obesity?Overweight and obesity are calculated by Body Mass Index (BMI). BMI is a person's weight in kilograms divided by the square of height in meters. The healthy adult human BMI ranges from 18.5 to 25.
If BMI is less than 18.5, it falls within the underweight range. If the BMI ranges from 25.0 to 29.9, it falls within the overweight range. If the BMI is greater than 30, it comes under the obesity range. A high BMI indicates high fatness.
Obesity and overweight are determined as an abnormal growth or excessive fat accumulation in the healthy range. It is caused by an energy imbalance between calories consumed and calories expended.
Obesity and Being overweight can cause certain diseases and health issues. It increases the risk of high blood pressure, heart disease, diabetes, and stroke.
It is important to maintain a healthy range BMI. Obesity and overweight are reduced by making the choice of healthier foods and regular physical activities like yoga and exercise.
Hence, The correct option is A) Overweight and Obesity.
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- The school zone in front of your school has a posted speed limit of 25 mi/h, which is about 11 m/s. Let's
examine the stopping of a car in several different situations.
a. The crossing guard holds up her stop sign, and the driver is paying attention well. The car moves at a
constant velocity of 11 m/s for 2.3 seconds while the driver reacts, then slows down at a constant rate
of -4.5 m/s2. What is the stopping distance for the car in this situation?
Answer:
s = 38.7 m
Explanation:
First we calculate the distance covered during uniform motion of reaction time.
s₁ = vt
where,
s₁ = distance covered during uniform motion = ?
v = uniform speed = 11 m/s
t = time = 2.3 s
Therefore,
s₁ = (11 m/s)(2.3 s)
s₁ = 25.3 m
Now, we calculate the distance covered during decelerated motion:
2as₂ = Vf² - Vi²
where,
a = deceleration = -4.5 m/s²
s₂ = distance covered during decelerated motion = ?
Vf = Final Velocity = 0 m/s
Vi = Initial Velocity = 11 m/s
Therefore,
2(-4.5 m/s²)s₂ = (0 m/s)² - (11 m/s)²
s₂ = (-121 m²/s²)/(-9 m/s²)
s₂ = 13.4 m
the total distance will be:
s = s₁ + s₂
s = 25.3 m + 13.4 m
s = 38.7 m
What's the answer to this question?
Answer:
The barometer is supporting 75 cm of Hg due to atmospheric pressure.
Since the manometer is open to air pressure, the gas pressure is supporting the air pressure plus the 30 cm of Hg.
So the "absolute" gas pressure is 75 + 30 = 105 cm of Hg.
What indicates that an atom
has no overall charge?
Please Help! Im dumb.
Two completely different compounds may contain identical elements.
True or False
If size of an image is 10 cm and the magnification produced by a mirror is +1, what will be the size of object?
Answer:
h = 10 cm
Explanation:
The magnification produced by a mirror is given by :
[tex]m=\dfrac{h'}{h}[/tex]
h' is the image size and h is the object size
We have, h = 10 cm, m = +1
So,
[tex]m=\dfrac{h'}{h}\\\\h=\dfrac{10}{1}\\\\h=10\ cm[/tex]
So, the size off the object is same as that of the size of the image i.e. 10 cm.