Answer:
C
Explanation:
Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place.
what equation demonstrates the law of conservation of mass
Answer:sorry i am only in 6 grade but this is a explanation
Explanation:Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Over 75 seconds a truck traveled at a constant velocity of 25 meters per second to the west. Find the trucks displacement
Answer:
1875 m west
Explanation:
Take east to be the positive direction. Given:
v₀ = -25 m/s
a = 0 m/s² (constant velocity)
t = 75 s
Find: Δx
Δx = v₀ t + ½ at²
Δx = (-25 m/s) (75 s) + ½ (0 m/s²) (75 s)²
Δx = -1875 m
A skater increases her velocity from 2.0 m/sec to 10.0 m/sec in 3.0 sec. what is the acceleration of the skater
Final speed 10.0 rn/s Change in time = 3 seconds The acceleration of the skater is 2.7 meters per second Relationship per second. 3.
3. Why does any bonding occur (this includes ionic bonding and covalent bonding)?
A.to avoid nuclear decay
B.to decrease stability
C.to increase nuclear decay
.
D.to increase stability
Answer:im not sure but hope this helps
Explanation:
Covalent bonds are formed because of sharing electrons whereas ionic bonds formation occurs because of transferring of electrons. Molecules are the particles in covalent bonds all through compound formation whereas in ionic bonds these are positively charged and negatively charged ions.
Rolling Balls LAB - ANSWER SHEET (45 pts)
QUESTIONS:
1. What is the formula for calculating speed? (1 pt)
2. If you were trying to determine if cars in your neighborhood were traveling at or below the posted speed limit, how would you do it? (2 pts)
3. Create a hypothesis as an if-then statement. (2 pts)
4-15. Fill in the Data Table for Balls #1 and #2 (2 pts per blank)
Ball #1 (Describe the ball) - ____________________________________________________
Trial Time to travel 2 meters (seconds)
1
2
3
Average Time
Using the formula s = d/t, calculate the average speed of Ball #1: _____________________
Ball #2 (Describe the ball) - ____________________________________________________
Trial Time to travel 2 meters (seconds)
1
2
3
Average Time
Using the formula s = d/t, calculate the average speed of Ball #2: _____________________
16. Based on your data, which ball was the fastest? (1 pt)
17. Why do you think it was the fastest? (2 pts)
18. Was your hypothesis correct? (1 pt)
19. Do you think size of the ball had anything to do with the speed of the ball? (2 pts)
20. Why or why not? (2 pts)
21. Name 2 factors that could determine the speed at which a ball rolls. (2 pts)
22. A car travels 3 kilometers and it takes 2 minutes to cover that distance What is the speed of the car? (2 pts)
23. A train is traveling at 60 km/hr. It travels for 2 hours. How far will it travel? (2 pts)
24. A girl is riding her bicycle at 10 miles/hour. At the end of the ride she has traveled 35 miles. How long did it take her to cover that distance? (2 pts)
Answer:
1. s = d/t
22. d = 3km = 3000m
t = 2m = 60s
s = 3000/60
= 300/6
= 50m/s
Therefore, the speed of the car is 50 m/s.
23. s = 60km/hr
t = 2hrs
d = s × t
d = 60 × 2
d = 120km
The car travels for 120km.
24. s = 10mile/hr
d = 35km
t = d/s
t = 35/10
t = 3.5hrs
The girl takes 3.5 hours to cover the distance
Brian and Emily are testing different paper airplane designs to see which will allow a plane to travel the farthest distance. Emily folds her plane and attaches a paperclip to the front of it. After she throws the plane, it travels about fifty feet and then falls to the ground. Why does the plane eventually fall to the ground?
Halp meh pleaase
Answer:
The answer is "The gravity force is stronger than for the powers in the air".
Explanation:
Gravity is the fundamental attraction force which acts among all material. On Earth, each organ does have a weight, and decreasing force of gravity, it relative towards its weight imposed by the earth's mass. Force is measured mostly by acceleration it gives to artifacts that can drop, that's why the plane eventually falls to the ground.
For which optical devices does d¡ always have a negative value?
A. A and B
B. A and D
C. Band D
D. B and C
Answer:
Explanation:
A i think
A 5.00 kg firecracker explodes into two parts: one part has a
mass of 3.00 kg and moves at a velocity of 25.0 m/s towards
the west. The other part has a mass of 2.00 kg. What is the
velocity of the second piece as a result of the explosion?
a -28.7 m/s
b 15.8 m/s
C-37.5 m/s
d 43.2 m/s
Answer:-37.5 m/s
Explanation:
Answer:
-37.5
Explanation:
What is the average speed of the Earth after one orbit if it travels 585.6 million miles in 12 months?
Answer:
Forty-eight million eight hundred thousand
Explanation:
You divide 585.6/12. I really hope this helps!!
If the velocity of a moving object decreases from 60 m/s to 30 m/s, what happens to its momentum? (2 points) Group of answer choices It is reduced by half It doubles It stays the same It quadruples
Answer:
it is decreased by 1/2
Explanation:
The velocity of the moving object is reduced by half decreasing speed is also decreasing the momentum of a certain object.
Answer:
-1/2
Explanation:
A rock is dropped from a height of 3.4 m. How much time does it take to hit
the ground?
O .83 s
O 1.17 s
O 0.59 s
O 33.32 s
What type of modulation is typically used by broadcasting stations to transmit pictures on television screens?
O amplitude
O frequency
O phase
O pulse
Answer:
The correct option is;
Amplitude
Explanation:
When transmitting picture signals over the air by broadcasting stations, the signals are shifted into high frequency channels of Very High Frequency (VHF) or Ultra High Frequency (UHF) carrier currents and imposing the the television signal by changing the amplitude of the high frequency carrier current to match the transmitted television signal waveform shape
Between which two atoms of water are hydrogen bonds are formed?
A. between the hydrogen atom of one water molecule and the oxygen atom of another
B. between the hydrogen atoms of two water molecules
C. between the oxygen atoms of two water molecules
1. The same amount of work can be done when applying a small force over a long distance or applying a large force over a short distance, since work equals blank times blank
Answer:
work done = force × displacement
Matching vocabulary terms
Answer:
.
Explanation:
26 = Terminal Velocity
27 = Force
34 = Momentum
33 = Laws of Conversation of Momentum (I think)
what are some of the uses of ultra-sound
Answer:
Ultrasound has been used in a variety of clinical settings, including obstetrics and gynecology, cardiology and cancer detection. The main advantage of ultrasound is that certain structures can be observed without using radiation. Ultrasound can also be done much faster than X-rays or other radiographic techniques
Answer:
Ultrasound can be used for various purposes like diagnosing conditions, including those in the heart, blood vessels, liver and more. Yet most commonly to monitor growth and development of a fetus. A echocardiogram is a ultrasound of the heart.
Explanation:
Determine the gravitational energy of your 2 kg physics binder if it is sitting on the ground (height= 0
meters)
Answer:
0J
Explanation:
The gravitational potential energy of the body is 0J because the height is at 0m.
Gravitational potential energy is a form of energy which is highly dependent on the position of a body. The relative position of a body in space accounts for the amount of gravitational potential energy they posses.
A body at height 0m has no gravitational potential energy:Gravitational potential energy = mgh
m is the mass of the body
g is the acceleration due to gravity
h is the height
So, if h = 0, Gravitational potential energy will become 0.
Pretty cool, the atoms that exist in your body are some of the same atoms that have existed since the beginning of the universe. You are made of star stuff. What scientist made this observation?
1) Neil Degrasse Tyson
2) Albert Einstein
3) Carl Sagan
Answer:
Your answer is option 3
Explanation:
The statement is that the atoms that exist in our body are the same number of atoms that existed at the beginning of the universe. This statement is said by Carl Sagan. Hence, option (3) is correct.
What is an atom?The atom is the smallest form of matter that can be separated without releasing particles with electrical charge. It is also the smallest material with chemical element-like properties. As a reason, the atom is the basic unit of chemistry.
The most of an atom is made up of space. The remainder consists of a cloud of electrons with negative charge orbiting a positive electrode nucleus composed of protons and neutrons. The nucleus is small and dense in comparison to electrons, the lowest charged particles in nature. Electric forces, which connect electrons to the nucleus of atoms, pull electrons to any positive charge.
To know more about Atom :
https://brainly.com/question/1566330
#SPJ2
A cheetah and a gazelle are grazing in the savannah. The gazelle is 275 meters away from the gazelle safe zone and the cheetah is 455 meters away. If the gazelle can run at 25 m/s and the cheetah can run at 65 m/s will the gazelle get to safety? If not how fast does the gazelle need to run to beat the cheetah by 2 seconds? I
Answer:
1) Yes, the gazelle gets to safety
2) The speed with which the gazelle needs to run, to beat the cheater by 2 seconds is approximately 29.79 m/s
Explanation:
1) The distance of the gazelle, from the gazelle safe zone = 275 m
The distance of the cheetah from the gazelle = 455 m
The speed of the gazelle = 25 m/s
The speed of the cheetah = 65 m/s
Therefore, we have;
Let the time the gazelle reaches the safe zone = t, which gives;
t = 275 m/(25 m/s) = 11
t = 11 seconds
Let the time the cheetah reaches the gazelle = t₁, we have;
455 + 25 × t₁ = 65 × t₁
t₁ = 455/40 = 11.375
t₁ = 11.375 seconds
The gazelle reaches the gazelle safe zone before the cheetah reaches the gazelle
Therefore, the gazelle gets to safety
2) In order for the gazelle to beat the gazelle by 2 seconds, we have;
The time for the cheetah to reach the safe zone = (275 + 455)/65 = 11.23 seconds
Therefore, we have;
In order for the gazelle to beat the gazelle by 2 seconds the time the cheetah reaches the safe zone = 11.23 - 2 = 9.23 s
The speed of the gazelle is then 275/9.23 ≈ 29.79 m/s
Answer: d = r · t d + 300cheertah = 18t gazelle = 16t the running times are equal! (d + 300) / 18 = d / 16 Solve ford then determine time.
sorry if its confusing
A 2.0 kg box is pulled along a frictionless, horizontal surface by a force that makes an angle of 30 degrees with the ground. If the box is pulled a distance of 4.0 meters and changes speed from 1.0 m/s to 3 m/s, what was the magnitude of the force on the box?
Answer:
2 N
Explanation:
v = Final velocity = 3 m/s
u = Initial velocity = 1 m/s
s = Displacement = 4 m
m = Mass of box = 2 kg
Acceleration of the box is
[tex]v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{3^2-1^2}{2\times 4}\\\Rightarrow a=1\ \text{m/s}^2[/tex]
Force is given by
[tex]F=ma\\\Rightarrow F=2\times 1\\\Rightarrow F=2\ \text{N}[/tex]
The force on the box is 2 N.
In which situation is no work being done?
Answer:
procrastinating
Explanation:
procrastinating is when someone dose not want to do work
Explanation:
if force is applied but object do not move then
it is situation for no work done
Which of the following materials is a mixture? A. water B. table salt C. seawater D.iron filings
Answer:
eu acho que ê a B
uma bela noite abençoada
Answer:
The answer is "B" table salt
Good look
Explanation:
50 POINT PHYSICS QUESTION! PLEASE HELP!
A girl, standing on a bridge, throws a stone vertically downward with an initial velocity of 12.0 m/s, into the river below. If the stone hits the water 2.50 seconds later, what is the height of the bridge above the water?
Remember to identify all your data, write the equation, and show your work.
Answer: I solved it and got 30.65 meters.
Explanation: Pic Attached. Hope this helps.
Answer:
30.65
Explanation:
becuase i read the othe part
A man exerts a force on a large couch by pushing on it. Which of the following must be a true statement about the couch after he begins pushing?
A. The couch will maintain a constant acceleration due to the man's push.
B. The couch will remain at rest.
C. The couch will remain at rest if the push does not overcome the force of friction.
D. The couch will accelerate and then remain at a constant velocity.
Answer: the answer is c
Explanation:
Which of the following is NOT a type of electromagnetic wave?
Answer:
Sound waves
Explanation:
You should let someone else answer too though because I'm not 100% sure that's the correct answer.
A soccer ball was kicked off the roof of a building going
20m/s. It took 5 s for the soccer ball to hit the ground?
Find the vertical final velocity, the distance the ball
traveled horizontally, and the height the ball fell.
Answer:
Final vertical velocity = -29m/s
Horizontal distance = 100m
Height = 20.41m
Explanation:
1. The vertical final velocity can be calculated thus: vy = vyo - gt
Where;
vy = vertical velocity (m/s)
vyo = vertical initial velocity (20m/s)
g = acceleration due to gravity (9.8m/s²)
t = time (5s)
Hence, vy = vyo - gt
vy = 20 - (9.8 × 5)
vy = 20 - 49
vy = -29m/s
2. x = V0 x t
Where;
x = horizontal distance (m)
Vo = initial velocity
t = time (s)
x = 20 × 5
x = 100m
3. Maximum height = (voy)²/2g
= 20²/ 2 × 9.8
= 400/19.6
= 20.41m
this is my physical science homework on chemical equations please if you can answer them in order thank you!
Why does the comet have tails
Answer:
Comets leave long beautiful tails when they come close to the sun. ... But when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and microparticles (electrons and ions). These materials form a tail whose flow is affected by the sun's radiation pressure.
Explanation: I just searched it up on the internet lol.
Answer:
when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and micro particles
Explanation:
:)
After a wave passes through a medium, particles in the medium
Answer:
If a particle is affected by a wave, then the particles are displaced. They move along the direction of the wave. Hence, After a wave passes through a medium, particles in the medium are moved along with the wave.
Explanation:
hope this helps you
A wheel with radius r rotates freely about its axle with initial angular speed ωi. A point on the wheel's rim moves at linear speed v.
Suddenly, the wheel accelerates so the point moves at linear speed 3v. The final angular speed is ωf.
How does the angular speed of the wheel change?
Answer:
[tex]\dfrac{2\omega_i}{t}[/tex]
Explanation:
r = Radius of wheel
v = Initial linear speed
3v = Final linear speed
Initial angular speed is given by
[tex]\omega_i=\dfrac{v}{r}[/tex]
Final angular speed after time [tex]t[/tex] is given by
[tex]\omega_f=\dfrac{3v}{r}\\\Rightarrow \omega_f=3\dfrac{v}{r}=3\omega_i[/tex]
The angular acceleration of the wheel will give us how the angular speed of the wheel changes.
From the equations of rotational motion we have
[tex]\omega_f=\omega_i+\alpha t\\\Rightarrow 3\omega_i=\omega_i+\alpha t\\\Rightarrow \alpha=\dfrac{3\omega_i-\omega_i}{t}\\\Rightarrow \alpha=\dfrac{2\omega_i}{t}[/tex]
The acceleration wheel is [tex]\dfrac{2\omega_i}{t}[/tex].
Answer:increases by a factor of 3
Explanation: just trust me bro