A physical change is one in which there is no new substance formed.
What is a physical change?A physical change is one in which there is no new substance formed. On the other hand, a new substance is formed in a chemical change. The following are cues that can show that a chemical change has taken place;
Change in temperatureEvolution of a gasAppearance of colorAppearance of a solid.In the absence of any of these, the experiment is a physical change. The question is incomplete as the observations were not shown here.
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This question is about magnetisation. I will give brainliest!!
Answer:
By seeing by how far away can it attract a paperclip.
Explanation:
Is kicking a ball or throwing a ball considered applied force? Explain.
Answer:
Kicking a ball involves you applying a force because you are pushing it with your foot and that makes it fly up. Once you shoot something into the air, the gravity force pulls it back down to the Earth, which is a different type of force.
Explanation:
hope this helps :)
What effect does wind and water have on mountains?
Answer:
Gale force winds, lightning strikes, temperature extremes and a deluge of snow, hail or rain. These combined forces break up the rocks and erode the peaks into their stark, sculpted forms. Falling ice, rocks and gushing water wear away at the mountain slopes.
What happens to the energy of a car when it hits a wall
it would deform, transferring some of its kinetic energy into the concrete molecules. Depending on the relative mass and anchorage of the wall, this may cause it to shift.
Suppose you are playing ice hockey in the middle of a totally frictionless frozen pond? How can you move yourself to the edge of the pond? Remember that without friction, you won't be able to push against the ice. Explain what you would do and why it would work.
Answer:
if it is totally frictionless you can only need to throw the hockey stick to one other side and wait for yourself to move slowly to the other side. this will happen by the law of conservation of momentum and Newton's First law (continues to move in the uniform velocity without external I. e. friction, Force).
an object of 98 N weight is dropped from 10 m height and it hit ground with a speed of 12 m/s find air friction
vf²=vi²+2ad
12²=0+2.a.10
a = 7.2 m/s²
W = m.g
m = W/g = 98/9.8 = 10 kg
∑F=m.a
W-fr=m.a
fr(air friction)=W - m.a
fr = 98 - 10 x 7.2
fr = 98 - 72
fr = 26 N
Frog jumps to the left with average speed of 1.8 m/s for 0.55 s whats the frogs displacement in meters
Answer: 0.99m left
Explanation:
The formula:
Distance / Time = Rate
Fill in the formula
Distance / 0.55s = 1.8 m/s
Multiply both sides by 0.55s
Distance = 0.99m
Displacement = 0.99m to the left.
Answer:
-0.99 (See attached)
Explanation:
(See attached)
What is the period of a water wave with a frequency of 0.5Hz
Answer:
a wave with a time period of 2 seconds has a frequency of 1 ÷ 2 = 0.5 Hz. A sound wave has a time period of 0.0001 seconds.
the element sodium has an atomic number of 11 and a mass number of 23.how many protons,neutrons ,and electrons does one atom contian
Answer:
answer is 12 because 23-11=12
Explanation:
it is because the question want find one atom contains how many
How many hours would it take for light to reach mercury
Answer: it will take it about 2 1/2 minutes to reach Mercury. Not hours.
hope this helps!
good morning! can someone please answer this, ill give you brainliest and your earning 50 points.
The uses of fossil fuel causes:
All of the aboveFossil fuels burn and increases in global temperature because it emits greenhouse gases. And the extreme climate change decreases biodiversity and last but not the least it increases pollution because burning of fuels emit gases like Carbon-dioxide etc...~
Answer:
All of the above
Explanation:
Fossil fuels burn causes combustion .
And we know combustion of hydrocarbons releases carbon dioxide .
Carbon dioxide is a very harmful gas and a main reason for air pollutionIt also responsible for global warmingHow does the dancing activity help you in improving fitness skills
•How does the dancing activity help you in improving fitness skills?
Answer:
•Health benefits of dancing
improved condition of your heart and lungs. increased muscular strength, endurance and motor fitness. increased aerobic fitness. improved muscle tone and strength.
Explanation:
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#Carry On Learning
In a bolt of lightning, 45, n, C,45nC flows to ground in 25, m, s,25ms. Work out the average number of charge carriers flowing past per second.
If 56, times, 10, to the power 16 ,56×10 16 electrons flow to the ground in 0, point, 035, mu, s,0.035μs, work out the average current.
How long does it take for a current of 6, point, 0, A,6.0A to deliver 1, point, 5, times, 10, to the power 17 ,1.5×10 17 [[Unsupported equation]]CuX
2+ ions in a solution? Assume these ions are the only charged particles moving.
(a) The average number of charge carriers flowing past per second is 1.8 x 10⁻⁶ A
(b) The average current delivered in the given time is 2.56 x 10⁶ A.
(c) The time taken to deliver the charge is 32,166.7 s.
Average number of charge flowing per secondThe average number of charge flowing per second is calculated as follows;
I = Q/t
I = (45 x 10⁻⁹) / (25 x 10⁻³)
I = 1.8 x 10⁻⁶ A = 1.8μ A
Average currentThe average current is number of charge flowing in a second.
I = Q/t
Charge of one electron = 1.6 x 10⁻¹⁹ C
Charge of 56 x 10¹⁶ electrons = 56 x 10¹⁶ x 1.6 x 10⁻¹⁹ C = 0.0896 C
I = (0.0896) / (0.035 x 10⁻⁶)
I = 2.56 x 10⁶ A
Time taken to deliver the chargeTotal charge in 2+ ions = 2F
1 Faraday = 96,500 C
2F = 2 x 96,500 C = 193,000 C
At the given amount of current, the time taken to deliver the charge is calculated as follows;
Q = It
t = Q/I
t = (193,000 )/6
t = 32,166.7 s = 8.9 hours
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Guys in this question north-west it means a negative dierection?
Azad, of mass 21 kg, is riding a 5.9 kg bike with a velocity of 4.5 m/s to the north- west. a. What is the total momentum of Azad and the bike together? b. What is the momentum of Azad? c. What is the momentum of the bike?
Answer:
a.) Total Momentum = 121 Kg•m/s
b.) Momentum of Azad = 94.5 Kg•m/s
c.) Momentum of Bike = 26.5 Kg•m/s
Explanation:
Given;Mass of Azad = 21 KgMass of bike = 5.9 KgVelocity = 4.5 m/sTo Find;The total momentum of Azad and the bike together = ?The momentum of Azad = ?The momentum of the bike = ?Formula;The product of mass and velocity is called momentum.P = mvNow,
For Azad;Mass of Azad = 21 Kg
Velocity = 4.5 m/s
P = 21 Kg × 4.5 m/s
P = 94.5 Kg•m/s
For Bike;Mass of bike = 5.9 Kg
Velocity = 4.5 m/s
P = 5.9 Kg × 4.5 m/s
P = 26.5 Kg•m/s
For Total Momentum;Total Momentum = Momentum of Azad + Momentum of Bike
Total Momentum = 94.5 + 26.5 = 121 Kg•m/s
-TheUnknownScientist 72
The diagram shows a simple circuit system containing wires, a battery, a switch, and a light bulb. Alert your teacher if this image is missing. Select the energy forms that are being produced when the switch is ON. The diagram shows a simple circuit system containing wires, a battery, a switch, and a light bulb. Alert your teacher if this image is missing. Select the energy forms that are being produced when the switch is ON. potential and sound thermal and nuclear magnetic and chemical thermal and light
The sequence of energy conversions is; chemical energy ---> electrical energy ----> heat and light energy
What is energy transformation?According to thee first law of thermodynamics, energy can neither be created nor destroyed but can be converted from one form to another. This is also called the principle of conservation of energy.
When the switch is turned on, chemical energy of the battery is converted to electrical energy is produced which is then converted to heat and light energy in the light bulb.'
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Answer: Thermal and Light
Explanation: When the switch is ON, the light bulb turns on, creating light. After a minute, the bulb will start to warm up, and so will the battery.
can someone pls help me create a lab trying to prove steam is hotter than boiling water.
Answer:
More energy
Explanation:
Steam is hotter than boiling water because it contains more energy
average speed?
It takes you 20 minutes to walk 1.5 miles to school. How far can you walk in one hour?
Answer:
4.5 miles
Explanation:
20 minutes x 3 is 1 hour
1.5 x 3 is 4.5
Answer:
4.5 Miles
Explanation:
20 x 3 = 60
60 min = 1 hour
1.5 x 3 = 4.5
difference between the. density of a rock and diamond
Answer:
A rock is made from two or more minerals. A mineral might contain just one chemical element or more than one element. ...
The diamond is the Earth's hardest mineral. A diamond is so hard that it's possible to cut a diamond with another diamond
a certain light wave has a frequency of 4.29 x 10^14 hz. what is the wavelength of this wave in empty space
The wavelength of a wave that has a frequency of 4.29 x 10^14 Hz is 6.9 × 10-⁵m.
HOW TO CALCULATE WAVELENGTH?The wavelength of a wave can be calculated using the following formula:
λ = v/f
Where;
λ = wavelengthv = velocityf = frequencyλ = 3 × 10⁸ ÷ 4.29 × 10¹⁴
λ = 0.69 × 10-⁶
λ = 6.9 × 10-⁵m
Therefore, the wavelength of a wave that has a frequency of 4.29 x 10^14 Hz is 6.9 × 10-⁵m.
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net force acting on a 100kg man standing in an elevator accelerating downward with a=9.8 m/s^2 comes out to be:
a. 980N
b. 580N
c. 1380N
d. zero
Explanation:
F=ma=(100kg)(4m/s/s)=400N
N is Newton, the SI unit of force, which is a kg•m/s/s. F is net force and, of course, m is mass and a is acceleration.
The net force acting on a 100kg man standing in an elevator accelerating downward with a=9.8 m/s^2 is d. zero
What is force?
Force is a push or pulls on an object that causes it to change its speed or direction.It is an external agent capable of changing the state of rest or motion of a body. It is a vector quantity so it has a magnitude and a direction.calculation force of a lift:-
net force,
Mg-F=Ma
100*9.8-F=100*9.8
F=100*9.8-100.9.8
F= 0
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How many mL are in 3.2 gallons
Answer:
12113.318mL
Explanation:
I hope this helps
5. A family leaves for an evening walk around the neighborhood. They leave at 5 pm and return at 6 pm. They traveled a total of 2.5 miles. What is their average speed?
This question involves the concepts of average speed, distance, and time.
The average speed of the family is "2.5 mi/hr".
AVERAGE SPEEDThe average speed is defined as the ratio of the total distance covered with the total time taken to cover it.
[tex]v=\frac{s}{t}[/tex]
where,
s = distance covered = 2.5 milest = total time taken = 1 hourv = average speed = ?Therefore,
[tex]v=\frac{2.5\ mi}{1\ hr}[/tex]
v = 2.5 mi/hr
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A beam of light passes through the air (n = 1. 00) and enters a diamond (n - 2. 42) at an angle of incidence of 40 degrees. Use Snell's Law to find the angle of refraction in the diamondIf the diamond is placed in a tank of water (n - 1. 33) and the beam of light enters the diamond at the same angle of incidence, what would be the new angle of refraction Show all work
Explanation:
This is the correct answer...
I hope you understand...
2. The resistance of the bulbs shown in the figure is 12 Ω each. What will the voltmeter read when the first switch is on and both switches are on?
3. The diagram in the figure shows the circuit data. Calculate the amperage of the circuit and the voltage across resistor R5 when:
(a) the switch is on;
(b) the switch is off.
As resistance doesn't affect potential difference voltmeter reading remains 6V
#3
#a
R=3ohmV=9VSo
Apply ohms law
[tex]\\ \rm\rightarrowtail I=\dfrac{V}{R}[/tex]
[tex]\\ \rm\rightarrowtail I=\dfrac{9}{3}=3A[/tex]
I is current#b
Switch is off
Current=0Acalculate the kinetic energy of: a car of mass 1200 kg that travels 60m in 3sec.
Answer:
240,000 J or 240 kJ
Explanation:
We can use the equation for kinetic energy:
KE = [tex]\frac{1}{2}mv^{2}[/tex]
where m = mass and v = velocity
Next, substitute the known values into the equation:
mass = 1200 kgvelocity = 60m in 3 seconds → 60/3 = 20 m/sKE = 1/2 × 1200 × 20² = 240,000 J
Answer: 240,000 J or 240 kJ
Hope this helps!
The acceleration of free fall on a certain planet is 8.0 m s-2. An object gets dropped from a
height and hits the ground after 1.5 s. From what height must the object have been dropped?
We are given that:
The acceleration of free fall on a certain planet is 8m/s². An object is dropped from the height and hits the ground after 1.5sWe need to find:
Height from which the object was dropped.Using equations of motion:
➙ v² - u² = 2as
➙ v = u + at
here,
u = initial velocityv = final velocitya = accelerations = displacementt = time taken Solution:From the given information, we can conclude that:
initial velocity of the object is 0 m/sacceleration due to gravity = 8 m/s²time taken = 1.5 secondsNow, using equation of motion:
➝ v = u + at
➝ v = 0 + ( 8 × 1.5 )
➝ v = 0 + 12 .0
➝ v = 12 m/s
final velocity of object = 12 m/sFor, acceleration :
➝ v² - u² = 2as
➝ ( 12 )² - ( 0 )² = 2 × 8 × s
➝ 144 - 0 = 16s
➝ 16 s = 144
➝ s = 144 / 16
➝ s = 9m
Displacement = 9 m[tex] \dag[/tex] Since, we take displacement in terms of distance in some places, therefore we can say that the height from which the object was dropped is 9 meters .
Runner A takes 45 s to run 400 m. Runner B takes 48 s to run the same distance. Which runner has the greater average speed?
A container of rocks is brought back from the Moon's surface where the acceleration due to gravity is 1.62 meters per second^2. If the total mass of the container of rocks is 65.0 kilograms, what is its weight on Earth's surface?
A) 65.0 N
B) 105 N
C) 394 N
D) 638 N
Force at moon:-
Use Newtons second law
[tex]\\ \rm\Rrightarrow F=ma=65(1.62)=105.3N[/tex]
Force at moon is one sixth of force at earth
Weight on earth;-
105.3(6)=631.8NWhat are ngc 2444 and ngc 2445, which nasa says are engaged in a "cosmic tug-of-war" with one apparently affecting the conditions of the other?.
The "cosmic tug-of-war" between NGC 2444 and NGC 2445 has result in the creation of new stars based on NASA's report.
What is a "cosmic tug-of-war"?A "cosmic tug-of-war" can be defined as a terminology that is used in astronomy to express the ratio of astronomical (planetary) and solar attractions on a natural satellite in space.
According to the National Aeronautics and Space Administration (NASA), NGC 2444 and NGC 2445 are both described as being engaged in a "cosmic tug-of-war" with NGC 2444 seemingly winning the battle..
In conclusion, NGC 2444 and NGC 2445 are both engaged in a "cosmic tug-of-war" because the immense gravity of NGC 2444 is pulling strands of gas from NGC 2445.
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A boat is rocking back and forth in the middle of the ocean. It takes 3 seconds for a wave to pass by before the next wave appears. The speed of the wave is 5 m/s. What is the wavelength?
The wavelength of the water wave is 15 m.
What is wavelegth?Wavelength is the distance of a complete cycle traveled by a wave.
To calculate the wavelength of the wave, we use the formula below.
Formula:
v = λ/T.................Equation 1Where:
v = velocity of waveT = periodλ = wavelength.make λ the subject of the equation
λ = vT............... Equation 2From the question,
Given:
v = 5 m/st = 3 secondsSubstitute these values into equation 2
λ = 5(3)λ = 15 m.Hence, The wavelength of the water wave is 15 m.
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