The statement is false because as the temperature of water is decreased from 4C to 0C, expansion occurs.
You should understand that this is very weird behavior for any compound ... within a small temperature range, the stuff actually gets bigger as it gets colder. That's why cubes float in your sody, and bergs float in the ocean.
Water is one of only two known substances that do this. And if water didn't do it, then life on Earth would not be possible.
Hmmm....
There is not contraction, Instead expansion occurs .
We know density of water is temperature dependant .
at 4°C water has max density so least volume as density is indirectly proportional to volume.
at 0°C density decreases so volume increases
Newton's first law states that objects do not change their velocity unless acted upon
by an outside force. When throwing a ball the ball initially accelerates from the force
provided by your arm and then begins to slow down.
What force(s) are responsible for the deceleration of the ball?
Answer:
Air resistance/Drag (this is the proper term for air resistance) or gravity or friction
It depends on the direction and if you throw it across a surface or if you throw it straight upwards.
I hope this helps!!
Answer:
Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.
Explanation:
When heat is added to ice, the first change it goes through will be which of the following?
It will begin to boil.
It will melt into a liquid.
It will turn into steam.
It will become a vapor.
Answer:
it will begin to melt into a liquid
Explanation:the ice will melt first before turning into a liquid.
How can we use thermal energy to our advantage?
Answer:
One of the primary advantages of thermal power is that the generation costs are extremely low. No fuel is needed to generate the power, and the minimal energy needed to pump water to the Earth's surface can be taken from the total energy yield.
Explanation:
Explanation:
heating system warming homes and other buildings is an abvous way that thermal energy can be used two common types of home heating system are hot water and warm air
Why does it take a long time to start Penicillin production?
Answer:
the growth of mycelial, by which reduction in carbohydrate level occurs in the medium. Because of this reduction in carbohydrate level
Explanation:
100 POINTS!!!
Which condition is NOT necessary for a hurricane to form?
warm ocean waters
very low air pressure
high air pressure
warm, moist air rising
Answer:
very low air pressure and that's not 100 points
Which of the following is considered to be a fine motor skill?
Jumping rope
Drawing
Running
Riding bicycle
The four balls in the diagram below are made of the same material are sold
Why is the force of gravity between the balls in pair 2 greater than the force of gravity between the balls in pair 1
The balls in pair 2 are closer together than the balls in part 1
The balls in pair 2 have a grater mass than the balls in pair 1
The balls in pair 1 have more rolling friction than the balls in pair 2
The balls in pair 2 have more magnetic force than the balls in pair 2
Answer:
The balls in Pair 2 have a greater mass than the balls in pair 1.
Explanation:
I took the test.
In a ride in an amusement park, a carriage of mass 450 kg is travelling horizontally at a speed of 18 m/s. It passes through a shallow tank containing stationary water. The tank is of length 9.3 m. The carriage leaves the tank at a speed of 13 m/s. PT 3 a.) Calculate the change in kinetic energy of the cart while it passes through the water tank J (Hint: Change
Answer:
98.
Explanation:
divide
The change in the kinetic energy of the cart is equal to 34875 J.
What is kinetic energy?The energy which is possessed by a moving body because of its motion is known as kinetic energy. Work should be done in order to bring the change in the kinetic energy of a moving object.
The kinetic energy of a moving object can be determined from the formula mentioned below:
K.E. = ½mv² where ‘m’ and 'v' is the mass and velocity of the object.
Given, the mass of the carriage, m = 450 Kg
The speed of the carriage, u = 18 m/s
The initial kinetic energy of the cart = (1/2) × 450 × (18)²
(K.E.)₁ = 72900 J
The final speed of the cart, v = 13 m/s
The final kinetic energy of of the cart = (1/2) × 450 × (13)²
(K.E.)₂ = 38025 J
The change in the kinetic energy of the cart = (K.E.)₂ - (K.E.)₁
Change in the kinetic energy = 72900 - 38025 = 34875 J
Learn more about kinetic energy, here:
brainly.com/question/15764612
#SPJ2
work and power!
______is the amount of work done over time a. Efficiency C. Power b. Newton d. Horsepower
Answer:
The work done in a unit of time is C. Power.
Explanation:
Hope this helps
A 10.0 kg mass is moving with constant speed of 10.0 m/s.
a.) How much work must be done to double the speed to 20 m/s?
b.) How much work must be done to reduce its speed to 5.0 m/s?
Answer:
what is the question name
The speed of light in air is 3 x 108 m/s. The speed of light in ice is 2.29 x 108 m/s. What is the refractive index from air to ice?
Answer:
η = 1.31
Explanation:
The formula for the refractive index of from air to some other medium is given by the following formula:
[tex]\eta = \frac{c}{v}\\[/tex]
where,
η = refractive index = ?
c = speed of light in air = 3 x 10⁸ m/s
v = speed of light in ice = 2.29 x 10⁸ m/s
Therefore, using these values in the equation we get:
[tex]\eta = \frac{3\ x\ 10^8\ m/s}{2.29\ x\ 10^8\ m/s} \\[/tex]
η = 1.31
which term describes the wave phenomenon in the image
Answer: (Next time put the Image but I know what u talkin bout)
wave changes its path from its initial direction so this phenomenon is known as Refraction of wave
Explanation:
When wave travels from one medium to other medium the due to change in the speed of the wave propagation it deviates from its initial path.
The deviation of the wave from its initial path is known as refraction of wave
Here we can see that wave incident on medium 1 with some angle with the boundary
Then it enters into other medium and then travels in other direction
So here wave changes its path from its initial direction so this phenomenon is known as Refraction of wave
I walked my dog 100 meters North to the end of the block, and 50 meters East to the park. After the park, I walked 60 meters South to my friend's house. What is the total distance traveled? Is the displacement of my journey scalar or vector?
Answer:
The answer is below
Explanation:
Distance is a measurement of how far apart two points are. Distance is a scalar quantity, i.e. it has magnitude and no direction.
Total distance traveled = distance traveled north + distance traveled east + distance traveled south
Total distance traveled = 100 + 50 + 60 = 210 meters
Displacement is the shortest distance between the starting and end points.
displacement² = 50² + (100 - 60)²
displacement² = 2500 + 1600
displacement = 64 meters
The displacement of the journey is vector, because displacement is a vector quantity.
A 0.22kg mousetrap car has 3.1 J of potential energy due to the spring in the mouse
trap. What is the maximum speed the car will reach? Show your work and include units.
Answer:
r56
Explanation:
The Doppler Effect for sound occurs when:
a) the speed of the wave changes
b) the height of the wave changes
c) the distance between the waves change
d)the moving object decreases in speed
PLZZZ HELP ME ASAP FOR BRAINLIEST AND 20 POINTS
I am desperate and these are my last points.
:'(
Answer:
gamma rays
Explanation:
An object carries a +15.5 µC charge. It is 0.525 m from a -7.25 µC charge. What is the magnitude of the electric force on the object?
Answer:
the force of attraction between the two charges is 3.55 N.
Explanation:
Given;
first charge carried by the object, q₁ = 15.5 µC
second charge carried by the q₂ = -7.25 µC
distance between the two charges, r = 0.525 m
The force of attraction between the two charges is calculated as;
[tex]F = \frac{kq_1q_2}{r^2} \\\\F = \frac{(9\times 10^9)(15\times 10^{-6})(7.25\times 10^{-6})}{(0.525)^2} \\\\F = 3.55 \ N[/tex]
Therefore, the force of attraction between the two charges is 3.55 N.
Why is physics used to study stars?
A. Stars are interesting.
O B. Stars are circular.
O C. Stars are useful.
O D. Stars are made of matter.
Answer:
stars are made of matter
An isloated point charge produce an electric field with magnitude E at a point 2 m away. At a point 1 m from the charge magnitude of the charge is .. A. E B. 2E C. 4E D. E/2
Answer:
the correct answer is C, E’= 4E
Explanation:
In this exercise you are asked to calculate the electric field at a given point
E = [tex]k \frac{q}{r^2}[/tex]
indicates that the field is E for r = 2m
E = [tex]\frac{ k q}{4}[/tex] (1)
the field is requested for a distance r = 1 m
E ’= k \frac{q}{r'^2}
E ’= k q / 1
from equation 1
4E = k q
we substitute
E’= 4E
so the correct answer is C
HELP ASAP THANKS
What happens to the mass of an object when the parts are rearranged?
Answer:
The law of conservation of mass is a fundamental principle of physics. According to this law, matter can be neither created nor destroyed. In other words, the mass of an object or collection of objects never changes, no matter how the parts are rearranged.
Hope it helps!!!
Answer:
their will be no change in this..
The law of conservation of mass is a fundamental principle of physics. According to this law, matter can be neither created nor destroyed. In other words, the mass of an object or collection of objects never changes, no matter how the parts are rearranged.
You plan to visit a friend who lives 30 miles away. You predict that your average speed for this trip will be 50 miles per hour. How long will your trip take?
0.4 hours (24 centimeters)
0.8 hours (48 centimeters)
0.6 hours (36 minutes)
1.66 hours (~100 minutes)
Answer:
.6 hours
Explanation:
to find time you divide distance by speed
Which describes the innermost layer of Earth?
Answer and Explanation:Option A->The innermost layer of the earth is known as the core. It is divided into inner core and outer core. It comprises of a high concentration of nickel and iron.
A construction worker transfers 6000000 J in a n 8 hour day of work. What is their average power output? just need a quick answer with the working, thanks
Answer:
208.33 W
Explanation:
Using,
P = W/t.......................... Equation 1
P = Average power output, W = total work, t = total time.
From the question,
Given: W = 6000000 J, t = 8 hours = (8×60×60) = 28800 s
Substitute these values into equation 1
P = 6000000/28800
P = 208.33 W.
Hence the average power output is 208.33 W
Use appropriate units and signficant figures.
You drive 67.0 mi 35.0º south of east and then drive 40.0 mi 20.0º west of south. What is your displacement?
Answer:
D = 54.9 mi, 71.6 South of the East
Explanation:
In this exercise it is asked to find the displacement of the body, one of the easiest tasks is to dispose each displacement in a Cartesian coordinate system, let's use trigonometry
* first displacement d₁ = 67.0 mi
the angle is 35 south of east, measured from the axis x θ = -35
cos -35 = x₁ / d₁
sin -35 = y₁ / d₁
x₁ = d₁ cos (-35)
y₁ = d₁ sin (-35)
x₁ = 67 cos 35 = 54.88 mi
y₁ = -67 sin 35 = -38.43 mi
* second displacement d₂ = 40, mi
the angle is 20 to the west of the south, so mean from the axis x is
θ = 180+ 20 = 200º
cos 200 = x₂ / d₂
sin 200 = y₂ / d₂
x₂ = d₂ cos 200
y₂ = d₂ sin 200
x₂ = 40.0 cos 200 = -37.59 mi
y₂ = 40.0 sin 200 = -13.68 mi
now we can find the displacement in each exercise
X_total = x₁ + x₂
X_total = 54.88 -37.59
X_total = 17.29 mi
Y_total = y₁ + y₂
Y_total = -38.43 -13.68
Y_total = - 52.11 mi
Let's use the Pythagorean theorem to find the displacement
D = [tex]\sqrt{x_{total}^2 + y_{total}^2}[/tex]
D = [tex]\sqrt { 17.29^2 + 52.11^2}[/tex]
D = 54.9 mi
to find the angle let's use trigonometry
tan θ = [tex]\frac{y_{total} }{x_{total} }[/tex]
θ = tan⁺¹ \frac{y_{total} }{x_{total} }
θ = tan⁻¹ (-52.11 / 17.29)
θ = -71.6º
the negative sign indicates that it is measured clockwise from the x-axis.
In cardinal coordinates it is 71.6 South of the East
What is the speed of a 1600kg car if its momentum is 120,000kgms?
Answer:
Velocity of car = 75 m/s
Explanation:
Given:
Mass = 1,600 kg
Momentum = 120,000kgm/s
Find:
Velocity of car
Computation:
Velocity = Momentum / mass
Velocity of car = 120,000 / 1,600
Velocity of car = 75 m/s
At which point on this graph do reactants begin to produce products as they collide?
Answer:b
Explanation:
i just did the quiz i was look for it too then got it
The point on this graph do reactants begin to produce products as they collide is B.
What is chemical reaction?The chemical reaction is the reaction between two reactants which led to the formation of products.
The products are substances which forms after reaction. The reactants are the substances which are original materials.
This graph shows how the reactants are reacted and products are formed in a chemical reaction.
As the reaction proceeds, the potential energy is higher when reactants begin to produce products.
Thus, the point on this graph do reactants begin to produce products as they collide is B.
Learn more about chemical reaction.
https://brainly.com/question/22817140
#SPJ5
An object is placed on a surface. A student tries to apply various combinations of forces on the object. Which pair of forces will not move the object?
Answer:
See Explanation
Explanation:
The question is incomplete, as there are no diagrams or options to provide more information to the question.
The general explanation is as follows:
For the object not to move
(1): The forces acting on the object must opposite each other. i.e. if force A acts at the right (or positive direction), force B will act at the left (or negative direction).
(2) The two forces must be equal.
So, for instance:
If the pair of forces are 5N and 5N in opposite directions, the object wil not move.
However, if one of the forces is greater, the object will move towards the direction of the greater force.
Brainliest for correct answer :)
The gravitational force between two bodies is 250N . What will the new force be if one of the masses is tripled?
If one of the masses is tripled, then their product is tripled, and the force between them is tripled. The new force is 750N .
Use the information and picture to answer the following question.
A student creates a poster with two models that show magnified views of the molecular motion in a solid and a liquid.
image
The student forgets to label the models with phases.
Answering which question would BEST help identify which model is in the solid phase?
A.
Which model shows the molecules vibrating in a fixed arrangement?
B.
Which model shows the molecules bouncing around each other?
C.
Which model shows the molecules sliding past each other?
D.
Which model shows the molecules spreading out at different angles?
Answer:
The answer is A
Explanation:
Solids vibrate in a fixed arrangiment, so to find which is a solid look for the one that vibrates in a fixed arrangiment.
According to the forces of attraction, the question which would best identify model is in solid phase is which model shows the molecules vibrating in a fixed arrangement?
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Learn more about forces of attraction,here:
https://brainly.com/question/23841038
#SPJ2