Answer:
4.53×10^9 years old.
Explanation:
Scientific notation is a mathematical term or expression that illustrates a method of representing actual numbers or figures that are often considered too substantial or too insignificant to be written appropriately using normal decimal representation. It can be depicted as "a x 10^n"
Hence, in this case, converting the age of the moon which is 4,530,000,000 years old to scientific notation is equal to 4.53×10^9 years old.
Answer:
4.53×10^9 years old.
A rocket is launched from a height of 3 m with an
initial velocity of 15 m/s.
What is the maximum height of the rocket? When
will this occur?
Answer:
14.25 m
1.5 s
Explanation:
Given:
y₀ = 3 m
v₀ = 15 m/s
v = 0 m/s
a = -10 m/s²
Find: y and t
v² = v₀² + 2aΔy
(0 m/s)² = (15 m/s)² + 2 (-10 m/s²) (y − 3 m)
y = 14.25 m
v = at + v₀
0 m/s = (-10 m/s²) t + 15 m/s
t = 1.5 s
The maximum height reached by rocket is 14.48m
The time the rocket will reach its maximum height is 1.53 secs
To get the maximum height, we will use the equation of motion. Using the equation of motion;
[tex]v^2=u^2-2g(\triangle s)[/tex]
where:
v is the final velocity
u is the initial velocity
g is the acceleration due to gravity
[tex]\triangle s[/tex] is the change in height
The equation can also be written as [tex]v^2=u^2-2g(s_2-s_1)[/tex]
Substituting the given parameters into the formula:
[tex]0^2=15^2-2(9.8)(s_2-3)\\0 = 225 - 19.6s_2+58.8\\19.6s_2=283.8\\s_2=\frac{283.8}{19.6}\\s_2= 14.48m[/tex]
Hence the maximum height reached by rocket is 14.48m
Get the required time this will occur.
[tex]v=u-gt\\0=15-9.8t\\9.8t=15\\t=\frac{15}{9.8}\\t= 1.53secs\\[/tex]
Hence the time the rocket will reach its maximum height is 1.53 secs
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what changes if the light is underwater and the light goes into air
Answer:
Therefore, when a light ray traveling through air enters water or glass it slows down, refracts, and bends toward the normal line. ... For example, when light goes from glass or water to air, it speeds up. Refraction changes how objects look.
Explanation:
The light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction. It is the change in the speed of the light that causes refraction.
How light and water affects the speed of the light?Light is slowed down in transparent media such as air, water and glass. The ratio by which it is slowed is called the refractive index of the medium and is always greater than one.Because of the physical differences in the makeup of the materials light actually travels slower through water and glass. Speed of light in a vacuum and air = 300 million m/s or 273,400 mph. Speed of light in water = 226 million m/s or 205,600 mph. Speed of light in glass = 200 million m/s or 182,300 mph.The light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction. It is the change in the speed of the light that causes refraction.
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while walking to school you approach an intersection and slow down from 2m/s to a stop 3s .what was your acceleration during this time interval?
Answer:
0.667 m/s^2
Explanation: Given that you slow down from 2m/s to a stop 3s.
Using first law of motion.
V = U - at
Where
Final velocity V = 0
Initial velocity U = 2 m/s
Time taken t = 3 seconds
Since the body slow down, the final velocity V will be equal to zero. And the acceleration will be negative.
Substitute all the parameters into the formula
0 = 2 - a × 3
3a = 2
a = 2 /3
a = 0.667 m/s^2
Therefore, your acceleration during this time interval will be 0.667 m/s^2
29
Which of the following would be a typical temperature range for a normal classroom?
a zero to 10 degrees Celsius
b. 15 to 20 degrees Celsius
c. 20 to 25 degrees Celsius
d. 30 to 40 degrees Celsius
Answer:
b
Explanation:
The cause of the moon is a cycle that is close to ____ long .
Answer:
29.5 days
Explanation:
It is a cycle that lasts nearly 29.5 days.
Answer:
28 days
Explanation:
The cycle is 28 days long.
What is the final velocity of a truck that accelerates from rest at a rate of 5 m/s^2 for 4 seconds?
Answer:
v=20
Explanation:
v=u + at
v=0 + 5×4
v=20
By the late 1800s, what type of evidence was being collected at crime scenes to help positively identify suspects by one particularly unique trait? Fingerprints Stolen goods DNA samples Photographs
Answer: hair
Explanation: Since a persons hair can be tracked back to their DNA this was often used because most of the criminals were female and all female have extremely long hair. Hair is also easy to find at a crime scene because the k9 dogs can easily smell it.
Answer:
The answer to this question would be fingerprints.
Explanation:
In the late 1800's Chinese organized a fingerprinting system and started using it to track down criminals
Kenya has a pile of salt on the counter. She uses a pinch of it for a meal. Which of the following physical properties of the salt changes? 1.)Density 2.) Shape 3,) Solubility 4.)Thermal conductivity
Answer:
The answer is shape.
Explanation: It says physical so it means the physical shape taking some of the salt would not change the density solubility or the Thermal conductivity
IF THE SPEED OF A BODY IS INCREASED FOUR TIME HOW WILL ITS KINETIC ENERGY BE AFFECTED ? SHOW BY CALCULATION?
Answer:
yes kinetic energy will be affected it will get increased 16 times.
Explanation:
A _____ yellow line means traffic on either side may cross the center line to pass another vehicle.
Answer: dashed
Explanation:
Answer:
Dotted
Explanation:
a double yellow is no pass
a dotted o one side may pass
nit sure about the just dotted tho
A car moves with constant velocity along a straight road. Its position is x1 = 0 m at t1 = 0 s and is x2 = 66 m at t2 = 6.0 s . Answer the following by considering ratios, without computing the car's velocity.(Express your answer to two significant figures and include the appropriate units.) 1.What is the car's position at t = 3.0 s ? 2.What will be its position at t = 24 s ?
Answer: 1. 33, 2. 264
Explanation: 66m= 6s so, to find the position at 3s you just need to take 66/2 = 33m cause 3 is half of 6. & for 2 you will take 66x4= 264m cause it took 4s multiply by the original 6s to get 24s. Answer: 1 is 33m and 2 is 264m
What is the power of 10 when 0.00503 is written in scientific notation?
Answer:
Negative 3
Explanation:
Bc scientific notation is the zeros either ahead or behind the actual numbers
Answer:
-3
Explanation:
2. How far does a skateboarder travel in 22 s if his average velocity is 12.0 m/s?
Answer:264m
Explanation: 12 x 22= 264m
What is the acceleration of the object in the graph?
Answer:
jus did this, the answer is A, -0.8 m/s^2 :)
Explanation:
A benefit to applying SQRW to your reading is faster reading abilities. Please select the best answer from the choices provided T F
Answer:This would be B
Explanation:
Answer:
False
Explanation:
If you apply the same amount of force to a 0.1-kilogram baseball and a 0.05-kilogram tennis ball, which one will accelerate more?
Answer:
The tennis ball.
Explanation:
Because the baseball is heavier, it requires more force to move it, whereas the tennis ball requires less force, so it will move more. Hope that makes sense!
If we apply the same amount of force to a 0.1-kilogram baseball and a 0.05-kilogram tennis ball, then the 0.05-kilogram tennis ball will accelerate more because the force is the product of the mass and acceleration.
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
As given in the problem statement If you apply the same amount of force to a 0.1-kilogram baseball and a 0.05-kilogram tennis ball,
force on any object = acceleration × mass of the object
As given the same amount of force is applied to both the objects then the object having less mass would experience a greater amount of acceleration.
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I need help with rounding each of the following to 3 significant figures
Answer:
2.30×10³
10.3
Explanation:
The rules for significant digits are:
Non-zero digits are always significant.Zeros between significant digits are also significant.Trailing zeros are significant only after a decimal point.To write 2300.2 in three significant figures, you'll have to write it in scientific notation.
2.30×10³
To write 10.26730 in three significant figures, simply round to the tenths place.
10.3
What the full name of DNA?
Answer:
Deoxyribonucleic acid
Explanation:
Answer:
Deoxyribonucleic acid
Explanation: Hopes that helps
Place thermometers near the edge of the table for easy retrieval. True or False
Answer:
This depends on the type of the thermometer, but when working with glass thermometers, (Hg especially) you should not put them near the edge of the table.
This is because it will easier to accidentally touch it and throw it into the ground, breaking the thermometer.
This is bad not only for the material loss of the lab instrument, but also because the mercury inside the thermometer is dangerous, so you really want to keep the thermometers in a safe place.
Then this would be false, do not leave the thermometers near the edge of the table (or in any place where it can fall and break)
What kinds of changes in substances are always physical changes?
The difference between a physical change and a chemical change is composition. In a chemical reaction, there is a change in the composition of the substance. In a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
Hope This Helps, Good Luck!
how to know give reason of force
An object moving at a constant velocity of 5.4 m/s travels for 12 s. How far will it move during that time?
Answer:
Explanation:
we know that
s=vt
given
v=5.4 m/s
t=12 s
s=5.4 m/s*12 s=64.8m
A bowling ball with a mass of 10 kg is moving at a speed of 3 m/s. What is its
kinetic energy?
A. 15 J
B. 90 J
C. 30 J
D. 45 J
If the forces on an object are not balanced than the object must be...
Explanation:
If the forces are not balanced on an object, the object experiences an overall net force. This will change the object's velocity.
Vector A has a magnitude of 63 units and points west, while vector B has the same magnitude and points due south. Find the magnitude and direction of a) A + B and b) A - B. Specify the directions relative due west.
Given :
Vector A has a magnitude of 63 units and points west, while vector B has the same magnitude and points due south.
To Find :
The magnitude and direction of
a) A + B .
b) A - B.
Solution :
Let , direction in north is given by +j and east is given by +i .
So , [tex]A=-63i[/tex] and [tex]B=63j[/tex]
Now , A + B is given by :
[tex]A+B=-63i+63j[/tex]
[tex]| A+B | = 63\sqrt{2}[/tex]
Direction of A+B is 45° north of west .
Also , for A-B :
[tex]A-B=-63i-63j[/tex]
[tex]|A-B|=63\sqrt{2}[/tex]
Direction of A-B is 45° south of west .
( When two vector of same magnitude which are perpendicular to each other are added or subtracted the resultant is always 45° from each of them)
Hence , this is the required solution .
What is the average speed between 1 and 5 seconds
Answer:
3 seconds is the average speed between 1 and 5
Find the x- and y- components of a 20 N, 30o south of west vector.
Answer:
Explanation:
If a force of 20N is situated at 30° south west, the x and y component of the vector will be expressed as:
Fx = -Fcos 30° and Fy = -Fsin30°
They are but negative because the force acts in the third quadrant of a four cardinal point
Fx = -20cos30°
Fx = -20(√3/2)
Fx = -10√3N
Hence the -x component if the force is -10√3N
Fy = -20sin30°
Fy = -20(1/2)
Fy = -10N
Hence the y-component is the vector is -10N
Which statement describes a question that can be answered by a scientific
investigation?
A. It asks why a scientist is curious about a phenomenon.
B. It is based on an observation of a natural phenomenon.
C. It is based on a philosophical argument.
O
D. It asks whether an investigation is worth doing.
SUBMIT
Answer: b
Explanation:
It is based on an observation of a natural phenomenon can be answered by a scientific investigation. Thus option B is correct.
What is scientific investigation ?Scientific investigation can be defined as a continuous process involving different steps to find out the answer to a specific scientific question by using scientific method.
The basic steps includes observation, which can be further used to develop, design of experiment and improve a hypothesis and an explanation based on an observed phenomenon.
There are different steps involved in Scientific Investigation such as
• Observation is the first step of the scientific investigation to observe the process involve in the step of inspection and conduction of the investigation by asking questions.
• Asking Questions is purely based on observation and it make sure that every detail is already known and a query existing can be solved quickly.
• making of a Hypothesis involves proper explanation of the query and it is most important part of the scientific investigation, it can come from a phenomenon.
• conclusion involves to the information drawn out, follow a proper scientific or a mathematical statement followed by Communication of the information from the investigation
Thus option B is correct.
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Mental and emotional health can be improved through exercise true or false
Answer:
True
Explanation:
It can help relax your brain
5x+3 (x-2)t5=7
What is x
Answer:
x=37/20 i think not so sure tho
