Answer:
Yeah ice floats on water.
Observation
Example in those areas were ice is found like Antarctica ice is found on top of water.
A hydrogen atom has a diameter of about 12.7 nm, express this diameter in centimeters.
We have to convert 12.7nm to cm
[tex]\\ \sf\longmapsto 12.7nm[/tex]
[tex]\\ \sf\longmapsto 12.7\times 10^{-9}m[/tex]
[tex]\\ \sf\longmapsto 0.127\times 10^{-7}m[/tex]
[tex]\\ \sf\longmapsto 0.00000127\times 10^{-2}[/tex]
[tex]\\ \sf\longmapsto 0.0000013cm[/tex]
How does the field of science gain knowledge and understanding?
A basic question about how science gains knowledge.
Science gains knowledge using the scientific method.
The first thing you need to understand here is the scientific method, with all the steps and a little explanation to each one.
Ask a question or find some problem to solve: (what you want to understand? In what area do you want to find new knowledge?) Perform research: (There is some existing knowledge in that topic?) Establish your hypothesis: (This is what you can conclude with the things you know, or what you expect to find) Test your hypothesis by conducting an experiment: (Perform an experiment to test your hypothesis, this is the most important part.) Make an observation: (Observe the outcome of the experiment) Analyze the results and draw a conclusion: (study what the outcome means) Present the findings: (Present what you learned to the scientific community, in this way the science gains knowledge).If you want to learn more, you can read:
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Answer:
Through the testing of hypotheses.
A dog runs 20 m east and then 35 m west in 12 seconds.
What is the dog speed? What is the dogs velocity?
Answer: Dog's speed = (20 + 35) /12 = 4.583 m/s
Dog's velocity = (20-35)/12 = -1.25 m/s
Explanation: Speed is a scalar quantity so we don't care about direction which means we add the magnitude of both the directions i.e. east and west.
About the velocity, it's a vector quantity. So, we must be very careful with the directions and signs. In cartesian coordinates system, we generally take the right side of origin as the positive x-axis and the left side of origin as the negative x-axis. So, considering the same fact, we consider east as positive side and west as the negative side.
Therefore, when we add 20m + (-35m), we get = -15m and you already have the time period of 12 s.
what are 2 ways elastic energy affects us as humans
Answer:
The coil spring of a wind-up clock.
An archer's stretched bow.
Explanation:
How many megabytes does a 30-gigabyte hard drive hold
Answer:
30,000
Explanation:
1 gig is 1000 megabytes
A 2.72 A current flows through a wire for
9.88 s. How much charge flows past a point
in the wire in that time?
[tex]\\ \rm\longmapsto I=\dfrac{Q}{t}[/tex]
[tex]\\ \rm\longmapsto Q=It[/tex]
[tex]\\ \rm\longmapsto Q=2.72\times 9.88[/tex]
[tex]\\ \rm\longmapsto Q=26.87C[/tex]
The amount of charge that flows past a point in the wire during that time is approximately 26.8976 Coulombs.
Electric charge is quantized, meaning it exists in discrete amounts and is measured in coulombs (C). The elementary charge, represented by the symbol "e," is the charge of a single proton or electron, approximately equal to 1.602 x 10^-19 coulombs. Protons carry a positive charge, while electrons carry an equal but opposite negative charge.
When electric charges are stationary, they create an electric field around them. When charges are in motion, they produce a magnetic field in addition to the electric field, leading to electromagnetic effects.
Charge is a fundamental property of matter that determines its interaction with electric and magnetic fields and is crucial to understanding and explaining various electrical and electromagnetic phenomena in the natural world.
To calculate the amount of charge that flows past a point in the wire use the equation:
Q = I * t
Where:
Q is the charge (in Coulombs)
I is the current (in Amperes)
t is the time (in seconds)
Given:
Current (I) = 2.72 A
Time (t) = 9.88 s
Substitute these values into the equation to find the charge:
Q = I t
Q = 2.72 A * 9.88 s
Calculating the product:
Q = 26.8976 C
Therefore, the amount of charge that flows past a point in the wire during that time is approximately 26.8976 Coulombs.
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Blaise is driving a car that is traveling 6.03 m/s and accelerates uniformly at 2.5 m/s² to reach a speed of 12.9 m/s. How long does it take for this acceleration to occur?
It would take 0.3639 seconds for this acceleration to occur.
Given the following data:
Initial speed, U = 6.03 m/sFinal speed, V = 12.9 m/sAcceleration, a = [tex]2.5 \;m/s^2[/tex]To find how long it takes for this acceleration to occur, we would use the first equation of motion.
Mathematically, the first equation of motion is given by the formula;
[tex]V = U + at[/tex]
Substituting the values into the equation, we have;
[tex]12.9 = 6.03 + 2.5t\\\\2.5t = 12.9 - 6.03\\\\2.5t = 6.87\\\\t = \frac{2.5}{6.87}[/tex]
Time, t = 0.3639 seconds
Therefore, it would take 0.3639 seconds for this acceleration to occur.
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(b) On what factor does the mechanical advantage of a simple machine depend? (a) N/m B. Very short answer questions, 1. What is the principle of simple machine? 2. 3. The efficiency of simple machine is 75%. What does it mean? 4. S. What is lever? In how many classes is lever classified? Write the name of a simple machine used to change the direction of force. 6.the velocity ratio of a pulley system is 4.what does it mean? 0 Reliant Science - 9
Answer:
No.b answer
the ratio of the length of the lever arm where the force is applied divided by the length of the lever are that lifts the load.
No.1 answer
if there is no friction in a simple machine, work output and work input are found to be equal in the machine.
No.3 answer
machine that is 75% efficient means that 75% of the work input is obtained as the useful output and the remaining 25% has been lost in overcoming the friction.
No.4 Answer
A lever is a simple machine made of a rigid beam and a fulcrum. In 3 calss lever is classified.
Simple pulleys change the direction of the force used to lift an object over a distance.
ratio of distance travelled by effort to the distance travelled by load in the machine.
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motorcycle starting from rest cover 200 metre distance in 6 second calculate final velocity and acceleration of the motorcycle
what is the relationship between the variables on this graph? The temperature does not have an effect on flow time. As the temperature increases, the flow time increases. As the temperature increases, the flow time decreases.
Answer: As the temperature increases, the flow time increases.
Explanation: i took the test
The relationship between the variables on this graph is that As the temperature increases, the flow time increases, therefore the correct answer is option B.
What is the kelvin scale of temperature?It is a scale of temperature used to measure the temperature, the kelvin scale of temperature is also known as the absolute scale of temperature.
The Standard International unit of thermodynamic temperature is the kelvin, often known less frequently as the degree Kelvin. The formal definition of one kelvin is 1/273.16 of the thermodynamic temperature of pure water's triple point.
As shown in the graph as the temperature increase across the X axis the flow time is increasing as well, these two variables are directly proportional to each other.
Thus, The graph shows a link between the variables, showing that when the temperature rises, flow time also rises, hence option B is the proper response.
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What do kinematic equations do?
Answer:
The kinematics equations describe the motion of an object undergoing constant acceleration
Explanation:
The kinematics equations describe the motion of an object undergoing constant acceleration. These equations relate the variables of time, position, velocity and acceleration of a moving object, allowing any of these variables to be solved for if the others are known
The speed of sound in air is about 330m/s. How long will it take to travel 1km answer in seconds to one decimal point
Answer:
3.03
Explanation:
time=distance/speed
1km=1000m
1000÷330
=3.030
calculate the frequency and time period of sound wave of 35 m wave length propagating at a speed of 3500m/s
Answer:
Frequency = 100 Hz
Time period = 0.01 sec
Explanation:
f= 3500/35 = 100
T = 1/f = .01
how do i get the correct answer for 0.429m to mm
the answer for 0.429m to mm is 429
Answer:
0.429m=429 mm
Explanation:
Since there are 1,000 millimeters per meter, you need to multiply by 1,000 to convert from meters to millimeters.
What is a primary source?
A.A textbook that explains a wide range of science topics
B.A technical article written by an experimenter
C.A newspaper article about a recent discovery
D.A summary of research written for an average reader
Answer:
Explanation:
B
A primary source is one that is written by the person who lived through an advenure or is one doing the action and recording it.
In this case, the answer is B.
Most frequently, for a historian, a primary source is something like a diary or a bunch of letter written by someone experiencing something.
It cannot be about someone else's work. Not C or D
A textbook is not the answer either. It is a bulky summary of scientific, or other kind of thought.
Which of the following objects has the greatest inertia?
5.0 kg object moving 5.0 m/s
15 kg object moving at 1.0 m/s
20.0 kg object at rest
10.0 kg object at rest
Last one has the greatest inertia
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Precision is how close a series of measurements are to ______
Answer:
Accuracy is how close a measured value is to an accepted value. Precision is how close measurements are to one another. To make measurements, you have to evaluate both the accuracy and the precision to get a correct value.
Q23 In Hindu chronology, the longest time measure is a para. One para equals 311 040 000 000 000 years. Calculate this value in megayears, hours and in seconds. Write your answers in scientific notation.
The conversion in megayears, hours and seconds are :
[tex]1 \: para \: = \: 3.11 \times {10}^{8} \: megayears[/tex]
[tex]1 \: para \: = \: 2.72 \times {10}^{18} \: hours[/tex]
[tex]1 \: para \: = \: 9.81 \times {10}^{21} \: seconds[/tex]
Given that :
1 para = 311040000000000 years
1 mega year = 1 million years :
311040000000000 years expressed in mega years will be :
Let : number of mega years = p
1 mega year = 1,000,000 years
p = 311040000000000 years
Cross multiply :
311040000000000 × 1 = 1,000,000 × p
311040000000000 = 1000000p
p = 311040000000000 / 1000000
p = 311040000 mega years
p = 3.1104 × 10^8 mega years
[tex]1 \: para \: = \: 3.11 \times {10}^{8} \: megayears[/tex]
In hours :
In hours : 8760 hour = 1 year
Let : number of hours = p
1 year = 8760 hours
311040000000000 years = p
Cross multiply :
p = 8760 × 311040000000000
p = 2724710400000000000
p = 2.72 × 10^18 hours
[tex]1 \: para \: = \: 2.72 \times {10}^{18} \: hours[/tex]
In seconds :
31536000 seconds = 1 year
Let : number of hours = p
1 year = 31536000 seconds
311040000000000 years = p
Cross multiply :
p = 31536000 × 311040000000000
p = 9808957440000000000000
p = 9.81 × 10^21 hours
[tex]1 \: para \: = \: 9.81 \times {10}^{21} \: seconds[/tex]
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ecent communication with the inhabitants of Neptune has revealed that they have a Celsius-type temperature scale, but based on the melting point (0oN) and boiling point (100oN) of their most common substance, hydrogen. Further communications have revealed that the Neptunians know about perfect gas behavior and they find that, in the limit of zero pressure, the value of pV is 28 dm3atm at 0oN and 40 dm3atm at 100oN. What is the value of the absolute zero of temperature on their temperature scale
The absolute zero temperature is the smallest thermodynamic thermal limit, which is considered as a zero kelvin when the enthalpy, as well as the entropy of a cooled ideal gas, are of minimal value.
It is expressed by using the formula:
[tex]\mathbf{T_{abs} = T_N + k}[/tex]
where;
[tex]\mathbf{T_{abs } = absoulte \ temperature}[/tex]
[tex]\mathbf{T_N = temperature \ at \Neptune \ Scale}[/tex]
k = factor to convert temperature from absolute scale to Neptunian scale
N:B: An absolute temperature = zero (0) kelvin
From the information given, Using Ideal gas since it is used in Neptune:
PV = nRT
where;
P = pressureV = volumen = no of molesR = rate(constant)T = temperatureFrom the question, provided that the gas is the same and no new mass is added;
Then, we can equate the moles of gas in the given conditions as;
[tex]\mathbf{\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}....\dfrac{P_nV_n}{T_n}}[/tex]
Using:
[tex]\mathbf{\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}}[/tex]
where the value of;
P₁V₁ = 28 dm³ atm
T₁ = 0⁰ N
P₂V₂ = 40dm³ atm
T₂ = 100⁰ N
∴
[tex]\mathbf{\dfrac{28}{(0+K)}=\dfrac{40}{(K+100)}}[/tex]
By cross multiply;
28(K+100) = 40(0+K)
28K + 2800 = 0 + 40K
40K - 28K = 2800
12 K = 2800
K = 2800/12
K = 233.33° N
Recall that:
[tex]\mathbf{T_{abs} = T_N + k}[/tex]
[tex]\mathbf{0= T_N+ 233.33 ^0 N}[/tex]
[tex]\mathbf{ T_N= - 233.33 ^0 N}[/tex]
Therefore, we can conclude that the value of the absolute zero of temperature on their temperature scale is -233.33° N
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(c) What are the factors of work? Also write their relation with work.
Answer:
Explanation:
Appreciation for your work.Good relationships with colleagues.Good work-life balance.Good relationships with superiors.Company's financial stability.Learning and career development.Job security.Attractive fixed salary.Good relationships with colleagues. Good work-life balance. Good relationships with superiors. Company's financial stability.
1. The atomic number of an element is the same as the number of ______ that the element has.
Answer:
Explanation:
The total number of protons in the nucleus of an atom gives us the atomic number of that atom. It is represented with the letter ‘Z.’ All the atoms of a particular element have the same number of protons, and hence the same atomic number. Atoms of different elements have different atomic numbers.
A car starts from rest and after 10 seconds its velocity is 20 m/s. Find the acceleration and the distance travelled by it.
Answer:
a=[tex]2ms^{-2}[/tex] S=100m
Explanation:
a=?vi=0m/s
vf=20m/s
t=10s
a=[tex]\frac{vf-vi}{t}[/tex]
a=[tex]\frac{20-0}{10}[/tex]
a=2m[tex]s^{-2}[/tex]
S=?S=vit+[tex]\frac{1}{2}[/tex]a[tex]t^{2}[/tex]
S=0+[tex]\frac{1}{2}[/tex]*2*[tex](10)^{2}[/tex]
S=100m
The small bunny exerts a force of 15 Newtons as it hops a distance of 3 meters to pass the large rabbit. How much work did the small bunny do?
45 Joules
0.2 Joules
18 Joules
5 Joules
Answer:
W = F × d
W = 15 × 3
W = 45 Joules
A projectile is launched vertically with an initial velocity of 50 m/s. How long would it take to reach the top of the launch?
Answer:
Explanation:
Givens
vi = 50 m/s
vf = 0
a = - 9.81
t = ?
Formula
t = (vf - vi)/a
Solution
t = (0 - 50)/-9.81
t = 5.097
Notice that a is made into a minus. It does not mean subtract. It means that the direction of the projectile and gravity must go in opposite directions. You will find that direction is a critically important consideration in physics.
Answer:
It'd take it 5.10 seconds
Explanation:
At the top of the launch, it is maximum height, h
formular derivation :
At maximum height, final velocity, v is zero
From first newtons equation:
[tex]{ \sf{v = u + gt}}[/tex]
v is the final velocity
u is the initial velocity
g is acceleration due to gravity
t is the time taken
but v is zero:
[tex]0 = u + gt \\ gt = u \\ t = \frac{u}{g} [/tex]
since it is vertical motion, u = usin(theta), where angle is 90°
[tex]{ \boxed{t = \frac{u \sin( \theta) }{g} }}[/tex]
t is the time taken to reach the top of the launch:
substitute, taking g to be 9.8 m/s²
[tex]t = \frac{50 \times \sin(90 \degree) }{9.8} = \frac{50}{9.8} \\ \\ { \boxed{ \boxed{time = 5.10 \: seconds}}}[/tex]
An apple weighing 1 N falls through a distance of 1m. How much work is done
on the apple by the force of gravity?
Answer:
W = F × d
W = 1 × 1
W = 1 Joule
step by step explanation
An apple is having a force of 1 N and it travels to a distance of 1 m then the work done on the apple by the force of gravity will be equal to 1 J.
What is Work?Work is a physics term used to describe the transfer of energy that occurs when an object changes above a distance because of an external force, at least some of which is given in the vector of the dislocation. The element of the strong acting all along the path multiplied by the length of the path can be used to calculate work if the force is constant.
Mathematically, this idea is expressed as W = fd, where W is the effort and f is the force multiplied by d, the distance. Work is completed whenever the pressure is applied at an angle with regard to displacement.
As per the given information in the question,
Force, f = 1 N
Distance, d = 1 m
Then, the work done will be,
W = fd
W = 1 × 1
W = 1 J.
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How does Bolsa describe his new client?
Answer:
loco
Explanation:
help me please i dont understand
Answer:
0.58
Explanation:
Sinẞ = opposite ÷ hypotenuse
Sinẞ = 5 ÷ 8.6
Sinẞ = 0.5814
Sinẞ ≈ 0.58
Answer: 0.58
Explanation:
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Fun Fact: Peanuts aren’t technically nuts
What is the correct definition of speed?
A. time (hours or seconds)
B. time per distance (hours per mile or seconds per meter)
C. distance per time (miles per hour or meters per second)
Answer:
C
Explanation:
The correct definition is distance / time, although teachers like to mix you up sometimes. A question like "How many minutes per mile does it take to go 3miles in 20 minutes?" In this question, the units are upside down.
The standard answer is what is the rate of speed when when 3 miles are covered in 2 hours.
Here the answer is 3/2 = 1.5 miles / hour which is the standard way of writing speed or rate. distance / time.
3. ¿Cuál es la distancia focal de un espejo CONVERo sabiendo que un objeto colocado
a 4 cm de él da una imagen virtual situata a 2 cm del espeso? ¿Cuál es el radio de
curvatura del espejo? Determina también las características de la imagen sie
objeto mide 5 cm
i dont know for real
Which unit is used to measure the mass of a computer?
Answer:
kilogram
Explanation:
