[tex]\\ \tt\hookrightarrow Density=\dfrac{Mass}{Volume}[/tex]
[tex]\\ \tt\hookrightarrow Volume=\dfrac{Mass}{Density}[/tex]
[tex]\\ \tt\hookrightarrow volume=\dfrac{48}{0.789}[/tex]
[tex]\\ \tt\hookrightarrow Volume=68.83cm^3[/tex]
Density of ethanol[tex]=0.789g/cm^3[/tex]
Mass of ethanol[tex]=78-30=48g[/tex]
[tex]Density = \frac{Mass}{Volume} [/tex]
[tex]Volume = \frac{Mass}{Density}[/tex]
[tex]Volume = \frac{48}{0.789}[/tex]
[tex]Volume = 68.83cm³[/tex]
A car drives at a velocity of 6.8 m/s for 250 seconds. How far did it travel?
[tex]\qquad \qquad\huge \underline{\boxed{\sf Answer}}[/tex]
Here's the solution ~
As we know, Displacement =
[tex]\qquad \sf \dashrightarrow \: velocity \times time[/tex]
[tex]\qquad \sf \dashrightarrow \: 6.8 \times 250[/tex]
[tex]\qquad \sf \dashrightarrow \: 1700 \: m[/tex]
OR[tex]\qquad \sf \dashrightarrow \: 1.7 \: km[/tex]
The car travelled 1700 meters ( 1.7 km )
A golf ball moving forward with a momentum of 1.0 kg m/s strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The momentum of the bowling ball after collision is:_____.
Answer:
The same
Explanation:
Momentum is conserved before and after collision.
Hope this helps!
Sometimes an old scientific model is replaced by a new model.
Explain why scientists replace an old scientific model with a new model.
Include an example from Physics in your answer (4 marks)
Explain why scientists replace an old scientific model with a new model.
Include an example from Physics in your answer.
₊˚ ଘ Answer:A scientific model is created to understand the concepts and explain the reason behind unexplained observations.
But the scientific models cannot explain all the unexplained observations.
When another scientific model which could explain some more observations than the previous model.
This new model replaces the old one.
One such example in physics is geocentric and heliocentric models.
The geocentric model was based on the principle that all celestial bodies revolve around the earth as its center.
But this model failed to explain some planets move backward instead of forward.
The heliocentric model was based on the principle that all planets revolve around the sun as its center including earth.
This model was able to resolve the backward and forward motion dilemma.
That is why heliocentric replaced the geocentric model.
[tex]\boxed{\huge \text{Hope this helps! :)}}[/tex]
[tex]\huge \text{Happy president's day! :)}[/tex]
-InLoveWithNature-
The model was used by scientists to predict the results of their investigations. The data frequently did not support their forecasts. This required a modification to the model.
The contemporary atomic model emerged as a result of numerous scientists building on one another's research.
What is scientific modeling?Creating a physical, mental, or mathematical model of a genuine occurrence that is challenging to see firsthand is known as scientific modeling.
In a range of scientific disciplines, from chemistry and science to ecology and also the Earth sciences, scientific models are employed to explain and forecast the behavior of real things or systems.
Though modeling is an essential part of contemporary science, scientific models are, at best, approximations rather than perfect representations of the systems and things they represent. As a result, scientists are always trying to enhance and improve models.
Scientific modeling has a variety of goals. Some models, which are frequently developed from experimental data, are being used mainly to visualize an object or system, such the three-dimensional dbl model of DNA.
To know more about scientific model:
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HELPPP PLEASE !!!
1. look carefully at the pair of images and think about what the arrow means.
which image ( A or B ) shows the direction someone would need to kick the ball in order to move it toward the goal?
Answer:
It is A that best describe it.
The image that shows the direction someone would need to kick the ball in order to move it toward the goal is image A.
We have,
The arrow in a diagram tells us the direction in which it will go.
Now,
From image A and image B,
Image A tells us that if we kick the ball in the right direction it will hit the goal.
Image B tells us that if we kick the ball in the left direction the ball will not hit the goal but go to the opposite direction.
Thus,
The image that shows the direction someone would need to kick the ball in order to move it toward the goal is image A.
Learn more about arrow signs here:
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write short note on land and sea breeze. diagram needed
A compass needle always points in a direction .........................
Answer:
Centre is the Answer hope its is right and helpfull
A car starts from rest and speeds up to 30 m/s in a total of 6 s.
What is the acceleration?
1. 5m/s2
2. 30 m/s
3. 24 m/s2
4. 5 m/s
What is the gravitational force between the sun and earth
Answer:
It's easier if you just read the explanation.
Explanation:
about 3.54x1022 N
The gravitational force between the Sun and the Earth is about 3.54x1022 N. This force keeps the Earth orbiting around the Sun.
When considering the wavelength of a radio wave – like the kind you hear when listening to music as you drive along – you would be correct to think that the size is this wave is about as long as:.
The size of the wavelength of a radio wave is in the order of millions of meters.
What is a radio wave?Radio wave is part of the electromagnetic spectrum. The radio wave is known to travel across a long distance because it has a long wavelength. This means that it has a low energy.
Hence, the size of the wavelength of a radio wave is in the order of millions of meters.
Learn more about radio waves: https://brainly.com/question/9279417
Answer: Building
Explanation: took a quiz :)
How can a mass be hot enough to flow but still act like a solid
This is a Science question about the layers of the earth...
Two point charges of 9μC and 4μC are placed a distance of 4 m apart.
1) Calculate the magnitude of the force, in Newtons, on a positive 5μC charge at the midpoint between the two charges.
2) Find the point, measured in meters from the 9μC charge, between the two charges where the force on the 5μC charge is 0?
Hi there!
1)
Since the charge placed in the middle is positive, we know that the particle is being repelled.
The particle experiences a greater repelling force by the 9μC charge. We can use the equation for electric force:
[tex]F_E = \frac{kq_1q_2}{r^2}[/tex]
k = Coulomb's Constant
q₁, q₂: Charges (C)
r = distance between charges (m)
This is a VECTOR quantity, so we must subtract the forces since they point in opposite directions.
Force from 9μC particle:
[tex]F_E = \frac{k(.000005)(.000009)}{2^2} = .101\\\\[/tex]
Force from 4μC particle:
[tex]F_E = \frac{k(0.000005)(0.000004)}{2^2} = 0.0450[/tex]
Subtract:
[tex].101 - 0.0450 = \boxed{0.561 N}[/tex]
2)
We can find a position by setting the two equations equal to one another. (Both repelling forces must be EQUAL for the force = 0 N)
Let the distance between the 9μC and 5μC charge equal 'x', and the distance between the 4μC and 5μC charge equal '4 - x'.
[tex]\frac{k(0.000009)(0.000005)}{x^2} = \frac{k(0.000004)(0.000005)}{(4 - x)^2}[/tex]
Cancel out 'k' and the 5μC value.
[tex]\frac{0.000009}{x^2} = \frac{0.000004}{(4 - x)^2}[/tex]
Solve for 'x' using a graphing utility.
[tex]\boxed{x = 2.4 m}[/tex]
What is the correct definition of nuclear fission?.
Answer:
subdivision of a heavy atomic nucleus, such as that of uranium or plutonium, into two fragments of roughly equal mass.
Explanation:
A 75 kg astronaut floating in space throws a 5 kg rock at 5 m/sec. How fast does the astronaut move backwards?
Answer:
The astronaut will get a velocity 0.064ms−1 opposite to the direction of the object.
If a 75 kg astronaut floating in space throws a 5 kg rock at 5 m/sec, then the astronaut would move backward with a speed of 0.33 meters/second.
What is momentum?It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.
P = mv
As given in the problem if a 5 kg astronaut floating in space throws a 5 kg rock at 5 m/sec,
By using the conservation of the momentum,
Assuming the initial momentum of the astronaut and ball would have been zero, the total final momentum of the system would be zero as well,
75*v +5*5 = 0
v = 25/75
v = -0.33 m/s
Thus, the astronaut would move backward with a speed of 0.33 meters/second.
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What can you do to lower your carbon footprint?
Answer:
buy what you need to reduce waste, eat organic foods. drive less when transporting try walking instead of using a car or train
Explanation:
what are you guy's zodiac sign ?!
Answer:
Capricorn what is yours
Answer:
leo
Explanation:
1. A car slams on brakes and comes to a stop after having been traveling 40m/s. The car stops in
only 0.5s. What is the car's acceleration? (Units for acceleration should be typed as m/s/s right
next to the number!)
Answer:
-80 m/s/s
Explanation:
acceleration = (v final - v initial) / time
a = (0 m/s - 40m/s) / 0.5 seconds
a = - 40 m/s / 0.5 seconds
a = - 80 m/s/s
A 75 kg softball player does a head-first dive and is sliding to a stop to the
right across the infield dirt. Her initial velocity was 4 m/s, and she comes to
a stop in 8 seconds. Find all forces. Ignore air resistance.
vf = vi + at
vf = 0
a = - (to stop (deceleration))
input the value:
0 = 4 m/s -a.8
8a = 4
a = 0.5 m/s²
F = m.a
F = 75 kg x 0.5 m/s²
F = 37.5 N
A satellite is launched from Earth into orbit. What happens to the mass and weight of the satellite?
Answer:
The mass of the satellite does not matter, as long as the ratio between the satellite's and the orbited object is small. On the other hand, if the masses are closer to each other, like the Earth and its Moon, then the model is more complicated.
Explanation:
over all forces acting on a object after the all the forces are combined is called the ___________
Answer:
net force.
Explanation:
While you are standing on your front porch, you decided to walk to the end of your driveway, 10 meters away, and back to your front porch, what is your distance traveled and what is your displacement?
Answer:
Distance travelled: 20meters
Displacement: 10 meters.
Explanation:
In geometry and mechanics, a displacement is a vector whose length is the shortest distance from the initial to the final position of a point P undergoing motion. It quantifies both the distance and direction of the net or total motion along a straight line from the initial position to the final position of the point trajectory. A displacement may be identified with the translation that maps the initial position to the final position.
In its orbit, Earth circles the sun once every year. This movement around the sun is called a(n) ________.
Answer:
Is called a(n) revolution
Explanation:
A spring has a spring constant of k = 50 N/m. The spring is compressed a distance of 31cm. What is the potential energy stored in the spring?
1.96 kg * m2/s2
Explanation:I'm assuming that you are asking what is the elastic potential energy stored in the spring at the position stretched by 16.5 cm...Since you know the spring constant k, 144 N/m and the spring stretch from the equilibrium position x, is 16.5 cm, or 0.165, you find the spring's potential energy from the equation PE = 12kx2, which equals 1.96 Joules, or kg * m2/s2 if you want SI units.
a car slows down from 20 m/s to 10 m/s in 5 seconds. what is it’s acceleration
Answer:
-2 m/s²
Explanation:
38.A student heard the echo of his voice from a nearby solid object after 2se. How far away
is the solid object? The speed of sound in air is 170m/s.
A. 85m
B. 170m
C. 300m
D. 340m
Answer:
B. 170m
Question explained in the photo attached
Hope it helped : )
The moving charge in the wire causes the compass to deflect; this is because
A. the moving charge induces a magnet field
B. the energy of the charge pushes on the compass
C. the electrons heat up the wire, causing the compass to deflect
PLS HELP I NEED TO TURN THIS IN SOON
What are you guys biggest fear?
Answer:
Dying
Explanation:
I know I am scared
A substances are composed
Substances are composed of atoms, although I'm not sure if this is what you mean
a car speeds up from 12 m/s to 20 m/s in 6.4 s. if its mass is 1200kg, what force must its engine provide?
Answer:
1500 N
Explanation:
• Initial velocity, u = 12 m/s
• Final velocity, v = 20 m/s
• Time taken, t = 6.4 s
• Mass, m = 1200 kg
[tex]\longrightarrow[/tex] F = ma
a = (v – u)/t, so
[tex]\longrightarrow[/tex] F = 1200 × (20 – 12)/6.4
[tex]\longrightarrow[/tex] F = 1200 × 8/6.4
[tex]\longrightarrow[/tex] F = 1200 × 80/64
[tex]\longrightarrow[/tex] F = 1200 × 40/32
[tex]\longrightarrow[/tex] F = 1200 × 20/16
[tex]\longrightarrow[/tex] F = 300 × 20/4
[tex]\longrightarrow[/tex] F = 300 × 5
[tex]\longrightarrow[/tex] F = 1500 N (Answer)
How many stars are in our solar system? Make your best guess.
Answer:
4.5 billion
Explanation:
There are many stars big and small so there must be billions