A cook had a jar containing a sweet food and a jar containing a sour food. The sweet food has a strong attraction between its molecules, and the sour food has a weak attraction between its molecules. At room temperature, both foods are liquids. The cook left both jars in a place where the same amount of energy was transferred into both substances. When she returned, one of the foods had changed phase while the other had not. Which food changed phase, and how did it change?
Answer:
The sweet food changed because the molecules were able to move fast enough to overcome the attraction between them with its molecules now moving away from each other.
Explanation:
We are told that the sweet food has a strong attraction between its molecules, and the sour food has a weak attraction between its molecules.
This means that the molecules in the sweet food would be moving at a faster rate than in the sour food because of the strong forces of attraction. Therefore, the molecules in the sweet food would be moving far away from each other hence the change of phase.
The sweet food changed since the molecules were capable to move fast i.e. sufficient to overcome the attraction between them with its molecules.
information regarding molecules:
The sweet food should contain the strong attraction between its molecules, and the sour food contains weak attraction between its molecules.This represent that the molecules in the sweet food would be moving at a faster rate as compared to the in the sour food because of the strong forces of attraction.Learn more about the molecure here: https://brainly.com/question/19922822?referrer=searchResults
You have arrived at the final accident scene of the day. Two cars of equal mass (2,000 kg each) were involved in a head-on accident at a four-way-stop intersection. Here is what you know:
Car 1 started at rest and coasted toward the intersection from the top of a 50-meter hill.
Car 2 was on a flat stretch of road at the bottom of the hill in front of Car 1.
Answer:
They prolly dead lol.
Explanation:
XD THEY DEAD!!
What is the final velocity of a car that has an initial velocity of 15.2 m/s and accelerates at 3.2 m/s^2 for 2.6 seconds?
Answer:
t=2.59s
Explanation:
v=23.5m/s u=15.2m/s a=3.2m/s^2 t=?
using equation v=u+at t=(v-u)/a t= (23.5-15.2)/3.2=8.3/3.2=2.59s
The force involved in a collision is 1.0×10 to the second power newtons the duration of the impact is 1.0×10 to the fourth power seconds what is the value of the change in momentum
Knowing the force and the duration, we can simply multiply them to get the "impulse". This is really convenient for this question, because the impulse is also the change in momentum. So let's do it:
Change in momentum = (force) x (duration)
Change in momentum = (1 x 10² Newtons) x (1 x 10⁴ seconds)
Change in momentum = (100 N) x (10,000 seconds)
Change in momentum = 1,000,000 Newton-seconds
Change in momentum = 1,000,000 kg-m/s .
That sunawfulada momentum ! It's the same change in momentum as if you stopped a 4,000-kg truck that was going 550 mph, in 1 second !
There's gotta be something wrong here.
Notice the duration of the impact in the question: 1 x 10⁴ seconds.
That's 2 hours and 47 minutes ! Collisions don't normally take that long.
Call me batty, but I've got a hunch that the duration actually is supposed to be 1.0 x 10 to the NEGATIVE fourth power. Then, the change in momentum is
(100 N) x (0.0001 s) = 0.01 kg-m/s
That's still a slightly uncomfortable result, but it's definitely more realistic ... it could be the act of batting a fly or a mosquito out of the air.
I like that a lot better than a collision that takes almost 3 hours.
5.
Classify the following as examples of newton's first law, second law and third law. Justify your
classification. [3marks]
a. A stone in the ground
b. Two people walking together
C. A hammer pushes a nail
A manufacturer selected a metal to use in producing a lightweight button for clothing. A metal that has a density of 2.71 g/cm3 was selected.
metal, data, metal, mass, grams, volume, centimenters, cubed, 1, 22.1, 3.00, 2, 42.0, 4.00, 3, 9.32, 5.00, 4, 8.13, 3.00,
Which of the metals was selected?
Metal 1
Metal 2
Metal 3
Metal 4
Just find the density of every metal and select the one with a density of 2.71 g/cm³ . This is:
Metal 1
ρ = m/V
ρ = 22.1 g / 3 cm³
ρ = 7.367 g / cm³
Metal 2
ρ = m/V
ρ = 42 g / 4 cm³
ρ = 10.5 g / cm³
Metal 3
ρ = m/V
ρ = 9.32 g / 5 cm³
ρ = 1.864 g / cm³
Metal 4
ρ = m/V
ρ = 8.13 g / 3 cm³
ρ = 2.71 g / cm³
R / Metal 4 was selected.
Which changes of state occur between solids and gases? Check all that apply.
vaporization
deposition
freezing
melting
sublimation
Answer:
deposition, sublimation
Explanation:
The changes of state occur between solids and gases during deposition and sublimation. The second and fifth option are correct.
What is sublimation?The conversion of solid to gas and gas to solid directly, as in case of solid ice made of carbon di oxide.
The change of state means changing the phase of the matter with the change in temperature and pressure of the surrounding.
The vaporization change liquid to gas or solid to liquid and vice versa. Freezing is converting liquid to solid. Melting is converting from solid to liquid.
The rest phenomenon are deposition and sublimation in which phase change between solid and gas.
Thus, second and fifth option are correct.
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We often see cracks on rocks and stones why
Answer:
Due to the process of weathering and erosion.
Explanation:
As the rocks are made of different forms of minerals they may have an igneous, metamorphic or sedimentary origin. Hence the natural stone surfaces can be made of granite, lime, or even shale. The process of physical weathering that is called as mechanical weathering of rocks tends to break them apart and leads to the development of crack and small openings. The diurnal exposure of bare rocks to extreme temperatures of day and night leads to onion peeling and slowly with water as an agent of erosion lead to cracks in joints of rocks.When you set a heavy bag down on the ground, you are doing _______ work on it.
When you set a heavy bag down on the ground, you are doing negative work on it.
Forces have strength, or magnitude, and direction.
True
False
A small car uses about 130000J of energy in the form of gasoline. The car converts that energy to a kinetic energy of 53000J. What is the efficiency of this conversion?
Explanation:
Given parameters:
Energy input = 130000J
Energy output = 53000J
Unknown:
Efficiency of the conversion = ?
Solution:
Efficiency is the percentage of work output to work input;
Mathematically;
Efficiency = Energy output/ Energy input x 100
Efficiency = 53000/130000 x 100 = 40.8%
Brandon is flying to the Western United States. His plane manages to cover 700 miles in 2 hours.
thats cool for brandon
Answer:
thats 350 miles an hour, 5.83 miles a minute, .0972 miles a second
Explanation:
Question 18 of 20 Planets A and B have the same size, mass, and direction of travel, but planet A is traveling through space at half the speed of planet B. Which statement correctly explains the weight you would experience on each planet? A. You would weigh the same on both planets because their masses and the distance to their centers of gravity are the same. B. You would weigh the same on both planets because your mass would adjust depending on the planet's speed. C. You would weigh less on planet B because it is traveling twice as fast as planet A. O D. You would weigh more on planet B because it is traveling twice as fast as planet A.
Answer:A, you would weigh the same on both planets because their masses and the distance to their centers of gravity are the same
Explanation:
What the someone explain this to me
Answer:
the answer might be A and D if not sorry
Explanation:
Calculate the momentum of the following objects:
a. 75kg speed skater moving forward at 16m/s
b. 135kg ostrich running north at 16.2m/s
c. 0.8 kg kitten running to the left at 6.5 m/s
Answer:
momentum(M in Kgm/s)=mass(m in Kg) *velocity(v in m/s)
a) M=m*v. m=75kg,v=16 m/s
M =75*16
M=1200Kgm/s
b)M=135*16.2
M=2187Kgm/s
c)M = 0.8*6.5
M=5.2Kgm/s
Hope it is helpful?
The momentum of an object having mass
a) 75kg speed skater moving forward at 16m/s is 1200 kg.m/s
b) 135kg ostrich running north at 16.2m/s is 2187 kg.m/s
c) 0.8 kg kitten running to the left at 6.5 m/s is 5.2 kg.m/s
What is momentum ?Momentum is defined as mass times velocity of body. it is denoted by p and its SI unit is Kg.m/s. It has both magnitude and direction. it is a vector quantity.
i.e. p = mv
a) Given,
mass m = 75Kg
velocity v = 16m/s
momentum p = 75× 16 = 1200 kg.m/s
b) Given,
mass m = 135Kg
velocity v = 16.2m/s
momentum p = 135×16.2 = 2187 kg.m/s
c) Given,
mass m = 0.8Kg
velocity v = 6.5m/s
momentum p = 0.8×6.5 =5.2 kg.m/s
Hence momentums of a), b) and c) are 1200 , 2187 and 5.2 kg.m/s respectively.
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Momentum,
A ball hits a wall and reverses course. According to
Newton's Third Law, which of these must be true? Select all
that apply.
Choose all that apply
The wall exerts a force on the ball.
The wall moves toward the ball.
The wall moves away from the ball.
The ball moves away from the wall.
The ball exerts force on the wall.
The ball moves towards the wall.
Answer:
THE WALL MOVES AWAY FROM THE BALL
Explanation:
NEWTON'S THIRD LAW STATES THAT THERE IS A OPPOSITE REACTION
A man paces 2m
east and 3m north
while on the phone.
The entire trip
takes 13s. What is
the man's distance,
displacement,
average speed, and
average velocity?
C
yo
of
S
shc
do
you
Us
be
Which planet do you think would be easiest for humans to colonize some day? Explain.
Answer:
I think that Mars would be the easiest planet for humans to colonize because they have already begun working on colonizing Mars and have made a ton of progress.
hi everyone........
Answer:
hiiiiiiiiiiiiiiiiiiiiiiiiii
Answer:
Hiii , how are you holding up with corona?
Explanation:
Alice added sodium chloride to water and stirred the water for several minutes. Alice is most likely trying to demonstrate that ionic compounds are hard. can dissolve. are clear. can melt.
sorry im late can dissolve is the answer <3
Answer:
dissolve
Explanation:
If 4000J is used to move a charge through a potential difference of 0.078V, what is the charge?
Answer:
102564.103 C
Explanation:
From the question given above, the following data were obtained:
Energy (E) = 4000 J
Potential difference (V) = 0.078 V
Charge (Q) =?
Thus, we can obtain the charge as illustrated below:
E = ½QV
4000 = ½ × Q × 0.078
4000 = Q × 0.039
Divide both side by 4000
Q = 4000 / 0.039
Q = 102564.103 C
Thus, the charge is 102564.103 C.
im a very dumb human being plz help
Answer:
so first is the clouds is presipitision then its the ocean one and then dirt and then the mud then the gray part
Explanation:
Buster Posey hits a pop-up straight up. The velocity of the baseball as it leaves the bat is 42.5 m/s. Determine (a) the total time the baseball is in the air, and (b) the maximum height the baseball reaches. Assume the baseball is caught at the same height above the ground as it was hit. Draw an image of the baseball for each 1 second of time it is traveling, for each image include a labeled velocity and acceleration vector.
Answer:
part a: 4.25s
part b: 180.625m
Explanation:
part a:
what we know: vi=42.5m/s
t=?
vf=0
g= -10m/s^2
----------------------------------------------------------
equation: vf-vi/g=t
plug in: -42.5m/s/ - 10m/s^2 = 4.25s
-----------------------------------------------------------
part b: 42.5m/s x(times) 4.25s = 180.625m
A girl cycles for 3hrs at a speed of 40 km/h. What distance did she travel? Must show your work
Answer:
120 mExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × time
From the question we have
distance = 40 × 3
We have the final answer as
120 mHope this helps you
A scientist is testing a fertilizer used to make corn grow taller. The scientist
adds different amounts of fertilizer to each field. He then measures the height
of the corn in each field. What is the manipulated variable in this experiment?
A. The height of the corn
B. The amount of fertilizer
C. The number of experiment groups
D. The number of pieces of corn
the height of the corn maybe
how long will it take for a rock to fall 50 meters
Answer:
The force of gravity, g = 9.8 m/s2
Gravity accelerates you at 9.8 meters per second per second. After one second, you're falling 9.8 m/s. After two seconds, you're falling 19.6 m/s, and so on.
Time to splat: sqrt ( 2 * height / 9.8 )
It's the square root because you fall faster the longer you fall.
The more interesting question is why it's times two: If you accelerate for 1 second, your average speed over that time is increased by only 9.8 / 2 m/s.
Velocity at splat time: sqrt( 2 * g * height )
This is why falling from a higher height hurts more.
Energy at splat time: 1/2 * mass * velocity2 = mass * g * height
Explanation:
The time taken by the rock to fall will be 3 seconds.
What is velocity?Velocity is defined as the ratio of the distance moved by the object at a particular time. The velocity is a vector quantity so it needs both the magnitude and the direction.
The time taken for the freely falling body is calculated by the equations of motion. That is v² = u² + 2gs. By using the equation we can calculate the velocity and the time period.
The force of gravity, g = 9.8 m/s²
Gravity accelerates you at 9.8 meters per second per second. After one second, you're falling 9.8 m/s. After two seconds, you're falling 19.6 m/s, and so on.
Time to splat = √( 2 x height) / 9.8
Time to splat = √( 2 x 50 ) / 9.8
Time to splat = 3 seconds
Therefore, the time taken for the rock to fall will be 3 seconds.
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An aircraft is descending with a constant velocity of 480 kmh at an angle of 2.0 to the horizontal. What is the vertical component of the plane's velocity
Answer:
Vy = 4.65 m/s
Explanation:
Since, the airplane is descending at a rate of 480 km/h at an angle of 2° from horizontal. Therefore, its vertical component of velocity shall be given as follows:
Vy = V Sin θ
where,
Vy = Vertical Component of Velocity = ?
V = Velocity of Plane = (480 km/h)(1000 m/1 km)(1 h/3600 s) = 133.33 m/s
θ = Angle = 2°
Therefore,
Vy = (133.33 m/s)(Sin 2°)
Vy = 4.65 m/s
how are theories and laws connected
Answer:
Laws are statements about something that's been observed and stated while a theory is an explanation of what's been observed. This connection between them forms a main idea that many people regulate as "what's normal."
Explanation:
Answer:
A hypothesis is a limited explanation of a phenomenon; a scientific theory is an in-depth explanation of the observed phenomenon. A law is a statement about an observed phenomenon or a unifying concept, according to Kennesaw State University. ... However, Newton's law doesn't explain what gravity is, or how it works.
for e.g:
The particle theory and Darwin's theory of human origin.
Twenty (20.0) mL of argon gas (Ar) is stored at STP. If the temperature and pressure are both doubled, what is the new volume?
PLZZ ANSWER ASAP!!
Answer:
The new volume is the same as the initial volume, i.e. 20 mL.
Explanation:
To find the new volume we can use the Ideal gas law:
[tex] PV = nRT [/tex]
Where:
P: is the pressure
V: is the volume
R: is the gas constant
n: is the number of moles
T: is the temperature
Initially, we have:
[tex] \frac{P_{i}V_{i}}{T_{i}} = nR [/tex] (1)
In the final state:
[tex] \frac{P_{f}V_{f}}{T_{f}} = nR [/tex] (2)
By equating equation (1) and (2) we have:
[tex] \frac{P_{i}V_{i}}{T_{i}} = \frac{P_{f}V_{f}}{T_{f}} [/tex]
[tex] \frac{P_{i}V_{i}}{T_{i}} = \frac{2P_{i}V_{f}}{2T_{i}} [/tex]
[tex]V_{f} = \frac{2T_{i}*P_{i}*V_{i}}{T_{i}*2P_{i}}[/tex]
[tex] V_{f} = V_{i} [/tex]
[tex] V_{f} = 20.0 mL [/tex]
Therefore, the new volume is the same as the initial volume, i.e. 20 mL.
I hope it helps you!
Add your answers to the table below.
Energy Sequence Table
Step 1
Step 2
Energy Form Energy Form
Step 3
Energy Form
Sequence Number
1: Turbine to Power Saw
2: Gas in Your Car
Thermal Chemical
3: Sunshine to Cows
4: Coal Power Plant
5: Wall Socket to Hair Dryer
Part 3: Journal Questions
Complete the following questions using what you learned in the Part 1 and 2 activity and in