Answer:
the distance traveled by the dog is 27.18 m.
Explanation:
Given;
initial velocity of the dog, u = 7.92 m/s
final velocity of the dog, v = 3.22 m/s
time of motion, t = 4.88 s
The distance traveled by the dog is calculated as;
[tex]s = (\frac{v+u}{2} )t\\\\s = (\frac{7.92 + 3.22}{2} )(4.88)\\\\s = 27.18 \ m[/tex]
Therefore, the distance traveled by the dog is 27.18 m.
A 2kg ball rolls down the hill. By the time it is at the bottom the balls kinetic energy is 25 J. What is the velocity at the bottom of the hill
Calculate the velocity(v) at the bottom of hill.
Solution:As we know ,
[tex] \bf\: Kinetic \: energy = \dfrac{1}{2} \times m \times {v}^{2} [/tex]
[tex] \red \bigstar \bf \: putting \: the \: values[/tex]
[tex] \rightarrow \: 25 = \dfrac{1}{2} \times 2 \times {v}^{2} [/tex]
[tex] \rightarrow \: 25 \times 2 = 1 \times 2 \times {v}^{2} [/tex]
[tex] \rightarrow \: 50 = 2 \times {v}^{2} [/tex]
[tex] \rightarrow \: {v}^{2} = \cancel \dfrac{50}{2} [/tex]
[tex] \rightarrow \: {v}^{2} = 25[/tex]
[tex] \rightarrow \: v = \sqrt{25} [/tex]
[tex] \rightarrow \: v = 5 \: m {s}^{ - 1} [/tex]
teacher drops a book to wake up his class, and the book hits the ground after 0.5 seconds. How high was the book?
What is the speed of a wave with a wavelength of 5 m and a frequency of 6.0 Hz
You should always use candid shots for photographing people. True False
Answer:
False
Explanation:
I took the K.12 test
Answer:
Person above me is correct, False
Explanation:
I go to K12 too (yes, it is K12)
Does heat cause kinetic energy to increase or decrease? Why?
Answer:
When the temperature of an object increases, the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.
Explanation:
What is the phase of the Moon when 100% of the Moon appears to be lit up?
Answer:
full moon is the answer to question
a submarine is observed to rise from a real depth of 80 cm to 60 cm in water calculate the change in apparent depth
please help!!!!!!!!!!
Answer:
15m
Explanation:
change in real depth = 80 - 60 = 20m
Let us assume that the index is 4/3
Refractive index = change in real depth ÷ change in apparent depth
change in apparent depth = change in real depth÷ refractive index
= 20÷(4/3) = 20×(3/4) = 5×3 = 15m
Kenny wants to get to Washington DC within 4 hours. Washington DC is 133 miles away from where he is. What is the avg speed he must go in order to meet his time frame ?
why is solid carbon dioxide known as dry ice
Hey there..
It gets this name because it does not melt into a liquid when heated; instead, it changes directly into a gas (a process known as sublimation).
Hope it helps you ..
plz mark me as brainliest ..
thank u
help me, please with this queastion
Answer:
Kinetic energy is the energy due to motion. Potential energy is energy stored in matter. The joule (J) is the SI unit of energy and equals (kg×m2s2) ( kg × m 2 s 2 ) .
please mark me brainliest and follow me my friend.
What happens to the force between the objects if Mass 2 decreases? (increases, decreases
affected)
The table shows the specific heat capacities of various substances. An iron block of mass 2kg is heated. Calculate the amount of energy needed to raise its temperature from 20°C to 30°C. Use the table to help you.
Answer:
9000 J
Explanation:
Human diversity means similarities among people. It's each of us in our rich and infinite indistinguishable features. True of false?
Answer:
False.
Explanation:
Human diversity means differences among people. Therefore, it's each of us in our rich and infinite indistinguishable features; this is basically the fundamental building block of culture. For example, a doctor might enjoy watching football and educational documentary programs while another enjoys listening to music and watching thriller movies.
Culture can be defined as the general way of life of a group of people living together in a particular location or society.
Basically, culture comprises of beliefs, values, behaviors, language, dressing, cuisine, music, symbols, arts, social habits, knowledge, customs, laws pertaining to a particular group of people living together in a society.
This ultimately implies that, culture are acquired and passed from one generation to another.
A cultural trait can be defined as the smallest characteristics of human activity (actions) that is mainly acquired socially and transmitted from one generation to another through various modes of communication. Thus, these unique behavioral informations or characteristics and beliefs acquired by people socially are transmitted from one individual or group of people to another.
Particulate Motion Unit Test
1. There are two pieces of copper. Piece A is at 70 degrees, while piece B is at 150 degrees. Which piece has more thermal energy? (1 point)
Piece A, because its particles move slower
Piece B, because its particles move faster
Piece A, because its particles move faster
Piece B, because its particles move slower
2. The electrons in the copper atoms in a wire start to move when an electric potential difference is introduced. Which statement about this situation is true?(1 point)
The macroscopic movement of the electrons creates a microscopic flow of electricity.
The macroscopic movement of the electrons creates a macroscopic flow of electricity.
The microscopic movement of the electrons creates a macroscopic flow of electricity.
The microscopic movement of the electrons creates a microscopic flow of electricity.
3. Which statement describes the gravitational energy and energy stored in a magnetic field when objects are drawn close to each other?(1 point)
Both gravitational energy and energy stored in a magnetic field attract.
Both gravitational energy and energy stored in a magnetic field repel.
Gravitational energy attracts; energy stored in a magnetic field attracts or repels.
Gravitational energy attracts; energy stored in a magnetic field repels.
4. A scientist is heating a piece of metal and measuring its temperature. She observes that the temperature of the metal is rapidly increasing. Which statement is correct about the thermal energy of the metal? (1 point)
Thermal energy will increase for as long as temperature is increasing.
Thermal energy will increase for as long as the metal is in solid state.
Thermal energy will increase for as long as the metal is absorbing heat energy.
Thermal energy will increase for as long as the potential energy is zero.
5. A student places a piece of ice inside a glass beaker at room temperature and heats them until they both come to 70°C. Which statement is correct about the energies of the ice and beaker? (1 point)
The thermal energy of the beaker has increased more than the thermal energy of the ice.
The thermal energy of the ice has increased more than the thermal energy of the beaker.
The potential energy of both the ice and beaker have increased the same amount.
The kinetic energy of both the ice and beaker have increased the same amount.
6. Which energy types are both examples of energy on a macroscopic scale?(1 point)
chemical energy and gravitational potential energy
thermal energy and spring potential energy
gravitational potential energy and kinetic energy
kinetic energy and thermal energy
7. A high diver steps off the diving platform and begins falling toward the pool of water below. Which statement about this situation is correct?(1 point)
The amount of energy that is transferred to thermal energy due to friction will be greater at the the top of the fall than at the bottom of the fall.
The gravitational potential energy of the diver decreases as it changes to kinetic energy.
The kinetic energy of the diver decreases as the diver approaches the water.
The gravitational potential energy of the diver increases because of the change in thermal energy due to friction.
8. For a system that contains a rock falling through the air, which situation is always true?(1 point)
The total potential energy of the system is conserved.
The total kinetic energy of the system is conserved.
The total mechanical energy of the system is conserved.
The total energy of the system is conserved.
Answer:
1. piece b because it’s particles move faster.
2. the microscopic movement of the electrons creates a macroscopic flow of electricity.
3. gravitational energy attracts; energy stored in a magnetic field attracts or repels.
4. thermal energy will increase for as long as the metal is absorbing heat energy.
5. the thermal energy of the ice has increased more than the thermal energy of the beaker.
6. gravitational potential energy and kinetic energy
7. the gravitational potential energy of the river decreases as it changes to kinetic energy
8. the total energy of the system is conserved.
Explanation:
just took the test; these are all correct!
For a system that contains a rock falling through the air, the total mechanical energy of the system is conserved.
The piece that has a greater thermal energy is the piece that is at higher temperature because Piece B has particles that move faster. The statement that is true regarding electron movement in a copper wire is that; "the microscopic movement of the electrons creates a macroscopic flow of electricity."The energy stored in a magnetic field is related to the gravitational energy by the statement; "gravitational energy attracts; energy stored in a magnetic field attracts or repels."The statement that is correct about the metal whose temperature is increasing rapidly is; "thermal energy will increase for as long as temperature is increasing."The statement that is true about the ice inside a glass beaker is that; "the kinetic energy of both the ice and beaker have increased the same amount."The energy types that are both examples of energy on a macroscopic scale are chemical energy and gravitational potential energy.As the diver steps off the diving platform and begins falling toward the pool of water below, the gravitational potential energy of the diver decreases as it changes to kinetic energy.For a system that contains a rock falling through the air, the total mechanical energy of the system is conserved.Learn more about mechanical energy: https://brainly.com/question/15025401
Au, Ag, and Cu are all metals. What characteristics will these three elements have in
common?
a. Poor conductors of heat, poor conductors of electricity, and dull
b. Shiny, good conductors of heat and electricity
c. Semiconductors or heat and electricity and used as chips in computers and phones
Answer:
B
Explanation:
help please! will give brainliest
Answer:
The Potential Energy of the Swing is Changing in to Kinetic Energy when is start moving.
Explanation:
When the Swing is pull at its extreme point then it has maximum potential energy. Because the formula of potential energy is:
P.E. = (1/2)k*x^2
Here x shows the body displacement from the mean (Equilibrium) position. Since at maximum position the displacement is maximum therefore the P.E. is maximum at the extreme point.
When the Swing is released and start moving from extreme position to mean its P.E. is changing into Kinetic Energy. Because with the movement towards the mean position body acquire more speed and that speed increases its velocity. Since Kinetic Energy is given as:
K.E. = (1/2) m*v^2
Therefore with the increase in velocity kinetic energy increases.
But when body again moving towards the extreme position, its kinetic energy again changes into P.E with the same reason as I discussed in the above paragraph.
Some of the energy is also changes in to heat in order to overcome air resistance.
A ball was rolling downhill at 2 m/s. After 5s, it was rolling at 90 m/s. What is its acceleration?
Answer:
17.6 m/s²
Explanation:
Given:
[tex]v_{f}[/tex] = 90 m/s (final velocity)
[tex]v_{i}[/tex] = 2 m/s (initial velocity)
Δt = 5s (change in time)
The formula for acceleration is:
[tex]a_{avg}[/tex] = Δv / Δt
We can find Δv by doing
Δv = [tex]v_{f}[/tex] - [tex]v_{i}[/tex]
Replace the values
Δv = 90m/s - 2m/s
Δv= 88m/s
Using the equation from earlier, we can find the acceleration by dividing the average velocity by time.
[tex]a_{avg}[/tex] = Δv / Δt
[tex]a_{avg}[/tex] = [tex]\frac{88m/s}{5/s}[/tex]
acceleration = 17.6 [tex]m/s^{2}[/tex]
If 15 C passes a point in a circuit in 5.0 s, the current in the circuit is:
Answer:
I = 3 Amp
Explanation:
Current in a Conductor
The electric current that moves through a conductor is defined as the charge Q that passes through it per unit time.
[tex]\displaystyle I=\frac{Q}{t}[/tex]
The SI unit for the current is the Ampere. One ampere is the current that flows when one coulomb of charge passes a point in a circuit in one second.
It's known that a charge of Q=15 C passes a point in a circuit in 5 seconds, thus the current is:
[tex]\displaystyle I=\frac{15\ C}{5\ s}[/tex]
I = 3 Amp
The current in the circuit is 3 A.
The current in the circuit can be calculated using the formula below.
Formula:
C = Q/t............... Equation 1Where:
C = Current in the circuitQ = Charge passing through the circuitt = time.From the question,
Given:
Q = 15 Ct = 5.0 sSubstitute these values into the equation.
C = 15/5C = 3 AHence, the current in the circuit is 3 A.
Learn more about current here: https://brainly.com/question/1100341
help pls .. Which image shows an example of the strong nuclear force in action?
The image that shows an example of the strong nuclear force in action should be considered option d.
What is the strong nuclear force in action?The strong nuclear force is known as the strong force or the strong interaction.
This force is strong when it overcomes the repulsive force that lies between the two positively charged protons where the neutrons and protons should be permitted for sticking together.
Hence, The image that shows an example of the strong nuclear force in action should be considered option d.
Learn more about force here: https://brainly.com/question/24710640
A girl running around a circular track of radius 200 m completes one
revolution in 10 minutes. What is her average velocity in one full
revolution
Answer:
v = 2 m/s
Explanation:
First, we find the angular velocity of the girl by using the following formula:
[tex]Angular\ Velocity =\omega= \frac{Angular\ Distance\ Covered}{Time\ Taken}\\\\\omega = \frac{1\ revolution}{10\ min}\frac{1\ min}{60\ s}\frac{2\pi\ rad}{1\ revolution}\\\\\omega = 0.01\ rad/s[/tex]
Now, for the average velocity of the girl we can use the following formula:
[tex]Average\ Velocity = V = r\omega\\V = (200\ m)(0.01\ rad/s)\\[/tex]
where,
r = radius = 200 m
therefore,
v = 2 m/s
which of the following is example of convection check all that apply
a metal rod in a fire place
light from the sun heated the earth
air circulating in a hot air balloon
water boiling
Answer air circulating in a hot air balloon
Explanation:
What is a food chain? (site 1)
Answer:
food chain is a process of how food is transported to the plant and then to the animal that eats the animal. there are primary, secondary, and tertiary and then decompose.
Explanation:
plz mark my answer as the brainliest
Answer:
A hierarchical series of organisms each dependent on the next as a source of food.
Explanation:
Hope this helps!! plz mark brainliest-Lily ^_^ ( food chain also known as the Circle Of Life)
Deanna’s niece loves to swing at the local playground, so Deanna takes her and pushes her on the swing. Deanna must use (motion / transfer / force / energy) to exert a (transfer / motion / force / energy) that causes the swing to change (force / energy / motion / transfer/position). Answer PLsssssss
Answer:
Force
Motion
position
Explanation:
Deanna's niece loves to swing at the local playground, so Deanna takes her and pushes her on the swing. Deanna must use force to exert a motion that causes the swing to change position.
A force is a push or pull on a body. The type of force applied by Deanna is called a contact force because Deanna's hand is in contact with the swing. When the force is applied, the swing moves and motion occurs. The to and fro movement of the swing is the motion resulting from the applied force. So, as motion occurs, the position of the swing changes.3. An earthquake occurs at 12:02 p.m. A seismic station records the first S-wave at 12:19 p.m. Which set
of data shows the approximate arrival time of the first P-wave and the distance to epicenter
Answer:
what y'all teachers be on
A rat is pushed with a massive force. The mass of the rat is 2.3 kg and the acceleration of the rat is 9.5 m/s^2. What was the force applied to the rat?
21.85 N
4.1 m/s^2
0.24 N
22 N
Answer:
Force = 21.85N
Explanation:
Given the following data;
Mass = 2.3kg
Acceleration = 9.5m/s²
To find the force;
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
[tex] F = ma[/tex]
Where;
F represents force.
m represents the mass of an object.
a represents acceleration.
Substituting into the equation, we have
Force = 2.3 * 9.5
Force = 21.85N
Therefore, the force applied to the rat is 21.85 Newton.
A laser beam from Earth is reflected by a mirror placed on the Moon. If the speed of the beam is 3.00 x 108 m / s and the distance from Earth to the Moon is 3.81 x 108 m, how long in seconds will the laser beam take to return to its starting point?
Answer:
1.27seconds
Explanation:
Speed = 324 m/s , Distance = 411.48m
Time = Distance/Speed
Time = 411.48/324 seconds
Time = 1.27seconds ( Ans)
How fast does a 500 Hz wave travel if its wavelength is 0.5 m?
Answer:
250 m/s
Explanation:
Answer:
250m/s
Explanation:
Frequency = velocity/wavelength
Then rearrange,
Velocity = frequency x wavelength
Velocity = 500 x 9.5 = 250m/s
How much heat is required to increase the temperature of 1 kg of steel from 21 °C to 22 °C?
9,000 j
306j
1j
500j
Answer:
466J
Explanation:
Given parameters:
Mass of steel = 1kg = 1000g
Initial temperature = 21°C
Final temperature = 22°C
Unknown:
Amount of heat required for this temperature increase = ?
Solution:
To solve this problem, we use the expression below:
So;
Heat absorbed = mass x specific heat of steel x change in temperature
Specific heat of steel = 0.466J/g°C
Therefore;
Heat absorbed = 1000 x 0.466 x (22 - 21) = 466J
An incident on route 12 summary?I need to describe what happens in the book in a short summary can anyone help?
Answer: An Incident on Route 12 is presented here in a high quality paperback edition. This popular classic work by James H. Schmitz is in the English language, and may not include graphics or images from the original edition.
Explanation: I HOPE THAT HELPED
If you were to look at grains of table salt with a magnifying glass, you would see that each grain is a little cube. Why are salt grains cubical?
Answer:
All extended structure compounds form cubes. Sodium and chlorine atoms both have cubical shapes. In the extended structure of NaCI, atoms are arranged in a cubical pattern
