A yellow ball with a mass of 2 kg is rolling across the floor at 3 m/s. A red ball with a mass of 3 kg is rolling across the same floor at 3 m/s. Which ball has greater kinetic energy, and why?
Answer:
The red ball
Explanation:
The red ball has greater kinetic energy, because it has a greater mass.
Which best illustrates the way in which radiation transfers thermal energy?
(in order from top to bottom)
A.
B.
C.
D.
The correct answer to the question is B. warm to cold.
EXPLANATION:
Before coming into any conclusion, first we have to understand radiation and conduction.
Radiation is the type of mode of transmission of thermal energy in which the radiations travels through space or vacuum without heating the intervening medium.
On the other hand, conduction is the mode of transmission of heat from one body to another body which are in contact with each other or hotter part to the colder parts of a body without any transport of material particle.
Heat always flows from a body at higher temperature to a body at a lower temperature in absence of external work done. The reverse is not possible in normal case.
Hence, the correct option will be B . It is so because heat is flowing from hot body to cold body, and there is no direct contact between the body. It explains correctly the mode of transmission of thermal energy through the process of radiations.
Radiation is the transfer of thermal energy without needing a material medium, like how the Sun's heat and light reaches the Earth through the vacuum of space.
Explanation:Radiation is the process by which thermal energy is transferred from one place to another without the need for a material medium. This is different from conduction and convection, which are other forms of heat transfer. A good example of this type of thermal energy transfer would be the energy we receive from the sun. The sun emits energy in the form of light and heat, which then travels through the vacuum of space to reach the Earth. The fact that this energy can travel through a vacuum, where there are no air molecules to conduct or convict the heat, demonstrates how radiation works. This is the best illustration of how radiation transfers thermal energy.
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You have 0.5 l of air at a pressure of 203 kpa and -70°c in a rigid, sealed contaainer. what is the absolute tempertaure of the air
To find the absolute temperature of the air at -70 degree\C, convert the Celsius temperature to Kelvin by adding 273.15, resulting in an absolute temperature of 203.15 K.
The question is seeking the absolute temperature of the air, which requires converting the given Celsius temperature to Kelvin. The absolute zero is -273.15 degree\C on the Celsius scale, which corresponds to 0 K on the Kelvin scale. To convert -70 degree\C to Kelvin, you add 273.15:
-70 degree\C + 273.15 = 203.15 K
Therefore, the absolute temperature of the air in the container is 203.15 Kelvin.
If the graphs of the equations in a system of linear equations coincide with each other, what does that tell you about the solution of the system? explain.
Given a temperature of 300 Kelvin, what is the approximate temperature in degrees Celsius?
Which of the following materials is not a fluid
A. Air
B. Cork
C. Gasoline
D. Water
it has to be a cork, because air is gaseous, and can be liquidized due to the large quantity of oxygen that makes it up
A car is traveling in a circular curve on a horizontal road at constant speed. Name the force that is responsible for causing its circular motion? a the gravity force b the normal force from the road c the friction force from the road d the tension force
A tow truck exerts a force of 8000 N to move a car a distance of 4 m in 20 seconds. Calculate the power of the tow truck..
1. 0.01 W
2. 100 W
3. 1600 W
Answer:
Power = 1600Watts
Explanation:
Power is given by the rate of energy expended or work done by a body (or object).
Power = [tex]\frac{Workdone}{time}[/tex]
Where;
Workdone = Force x distance
=> Power = Force x distance / time -----------------------(i)
According to the question,
Force = 8000N
distance = 4m
time = 20 s
Substitute these values into equation (i) above
=> Power = 8000 x 4 / 20
=> Power = 1600Watts
Therefore the power of the tow truck is 1600Watts
Which best describes the forces identified by Newton’s third law of motion?
equal and acting on different objects
equal and acting on the same object
unequal and acting on different objects
unequal and acting on the same object
Best answer is A: Equal and acting on different objects
Explanation, according to the third law of motion, this is how it works.
I can also confirm that I have tested on this question and got 100% on that test, so this answer has to be correct.
The forces identified by Newton’s third law of motion is best describes equal and acting on different objects.
What is Newton’s third law of motion?If an object exerts a force on another object, then another object must exert a force of equal magnitude and opposite direction back on first object.
Example of Newton’s third law of motion are
A swimmer moves forward by pushing off the side of pool. This way, the wall pushes in opposite direction and giving acceleration.Rockets move forward by expelling gas backward at high velocity. That means, the rocket exerts a large backward force on the gas in the rocket combustion chamber, and the gas thereby exerts a large reaction force forward on the rocket. This reaction force is called thrust.Helicopters create lift by pushing the air downward, therefore facing an upward reaction force. Birds fly by exerting force on air in a direction opposite to that of whatever force they need. The wings of a bird force air down and backward in order to get lift and forward motion.To learn more about Newton’s third law of motion here
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what is the best definition of intensity
a.intensity is the frequency of a wave
b.intensity is the amount of energy a wave carries per second
c. intensity is how well a sound travels through a medium
plzzzzzz help!!!!!!!!
Answer:
B
Explanation:
A is incorrect because intensity is dependent on the amplitude not on the frequency.
B is correct because intensity is the amount of energy a wave carries per second.
C is incorrect because intensity is not how well a sound travels through a medium.
keeping the mass of the balls equal, decrease the distance between them. what happens to the force arrows?
Answer:When the distance between the balls decreases, the size of the arrows increases. This shows that the gravitational pull between the balls also increases.
Explanation:
Edmentum
________ occurs when the horizontal winds move air against mountain ranges, forcing air to rise as it passes over the mountains.
If you put a ballon in the freezer, what happens to the gas pressure in the ballon?
Amy throws a softball through the air. What are the different forces acting on the ball while it’s in the air? The softball experiences force as a result of Amy’s throw. As the ball moves, it experiences from the air it passes through. It also experiences a downward pull because of . NextReset
Answer:
As the ball moves, it experiences from the air it passes through. It also experiences a downward pull because of gravity
Explanation:
When Amy throws a ball in the air then initially the force is applied by Amy to accelerate the ball in the air.
Now after throwing into the air the ball will have forces as per the FBD
Ball will have a downward force which is due to gravity and its magnitude is always remains the same
Now ball also have another force opposite to the direction of motion due to air drag.
This air drag force depends on the speed of the ball and always opposite to the velocity of the ball.
so correct answer will be
As the ball moves, it experiences from the air it passes through. It also experiences a downward pull because of gravity.
Which term could be used to explain why someone could safely sit on a hot wooden bench but not a hot metal bench? A. Radiation B. Specific heat capacity C. Convection D. Kelvin
the saclike structure that surrounds the glomerulus is the. a. renal pelvis b. calyx c. bowman’s capsule d. cortex e. none of the above
Talia is manufacturing rolls of wire for hanging pictures. She needs a material that is ..... so that it can easily be pulled into wire without breaking.
A) Conductive
B) Lustrous
C) Ductile
the correct answer is C. ductile.
Talia needs a ductile material for wire manufacturing, and copper is an example with high tensile strength and superior conductivity, making it suitable for electrical wiring.
Talia requires a material that is ductile for manufacturing rolls of wire for hanging pictures. Ductility is a key characteristic of certain metals that allows them to be drawn into thin wires without breaking. Copper is a prime example of a ductile material, and in addition to its ductility, copper is known for having a high tensile strength and being a very good conductor of electricity due to its low resistivity. These properties make copper an excellent choice for electrical wiring, though other materials like aluminium and gold are also used for specific applications due to their unique advantages, such as aluminium's lower weight and gold's resistance to corrosion.
A conducting copper wire has a 2.0mm diametr, a 1.5 length, and a 50 m resistance. What is the resitivity of the wire? What general information would you need to find out in order to answer the question
The stemplot below shows the heights (in inches) of students in a class.
Answer:
B 70 inches
Explanation:
In a stem plot the numbers on the left side of the line are called the stem and the value on the right side are called the leaves. The stem represents the tens place while the leaves represent the ones place of a number.
The height of the students are as follows:
52 55 55 56 59
62 64 67 67
70 71
It can be seen that 70 inches is the height of one of the students.
The farther the electron is from the nucleus, the more __________________ it has. A) charge B) energy C) mass D) pull
Answer:
B. Energy
Explanation: To pull an electron of outer shell of atom less energy is required. Because work done in pulling electron from outer shell is less( as attraction is weak ) in comparison to work done in pulling an electron from inner shell ( attraction with nucleus is strong). The energy needed to pull out an electron from an atom can be explained by ionization energy. Which means farther the electron is from the nucleus more energy it has.
Dalton’s theory was identified using light microscope images of atoms. the experimental results of other scientists. water vapor and air experiments.
Answer:
C
Explanation:
Answer:
It is C.
Because of his theory water turns into air of a process called evaporation.
And im giving credit to the guy above his awswer
Question 3 Unsaved
Which type of galaxy is the Milky Way ?
Question 3 options:
elliptical
satellite
irregular
spiral
a machine does 1500 joules of work in 30 second What is the power of the machine
The power of the machine is calculated as the work done divided by the time taken, which in this case is 50 watts for a machine that does 1500 joules of work in 30 seconds.
Explanation:To calculate the power of the machine, we need to use the formula power equals work done divided by time taken. In this scenario, the machine does 1500 joules of work in 30 seconds. Using the definition of power (1 watt = 1 joule/second), we can compute the machine's power output.
Power = Work / Time
Power = 1500 joules / 30 seconds
Power = 50 watts
The power of the machine is 50 watts.
During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 76.0 n/m. if the hose is stretched by 2.50 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length?
Which of the following best describes a completely elastic collision?
The kinetic energy (K) of the system before the collision equals K after.
The potential energy (U) of the system before the collision equals U after.
The kinetic energy (K) of the system before the collision is greater than K after.
The kinetic energy (K) of the system before the collision is less than K after.,
Answer:
The kinetic energy (K) of the system before the collision equals K after.
Explanation:
An elastic collision is a collision in which there is no net loss in kinetic energy from the system as a result of the collision. The amount of motion and the kinetic energy are conserved quantities in elastic collisions. This means that the kinetic energy (K) of the system before the collision equals K after.
Some collisions between atoms in gases are examples of perfectly elastic collisions.
A wrench reduces the force needed to tighten a bolt. For this statement to be true, the wrench _____. A. decreases the input force and decreases the input distance B. increases the input force and decreases the input distance C. increases the input force and increases the input distance D. decreases the input force and increases the input distance
Answer:
D
Explanation:
Just looking at the physics of a wrench, it allows us to apply a turning force to an object. The reason a wrench is helpful is that it allows us to create a greater turning force, without necessarily changing the force applied to it.
Using the formula:
Fm = The moment of a force (the turning force)
F = The force applied
d = Distance from the fulcrum that the force is applied
Fm = F x d
This formula basically states that, if the moment of the force (output force) stays constant, then the force must decrease, if the distance increases.
Hence, the further away from the fulcrum that the force is applied (increase input distance), the less force needs to be applied (decrease input force).
What is the source of all magnetism?
Gravitational waves
Sound waves
The core of the Earth
Electric current
Electric current. The source of all magnetism is electric current, both at macroscopic and microscopic levels, responsible for phenomena including Earth's magnetic field and ferromagnetism.
The source of all magnetism is electric current. This includes both macroscopic currents, such as those flowing through a wire, and microscopic currents, such as those associated with electrons orbiting an atomic nucleus or the spin of subatomic particles like protons and electrons. In the case of Earth's magnetic field, it is mostly generated by electric currents in the planet's molten outer core. In common materials, magnetism arises from the internal cooperative alignment of electron spins, a phenomenon known as ferromagnetism. The relationship between electricity and magnetism is such that separate north and south magnetic poles, or magnetic monopoles, do not exist; instead, magnetic effects are always due to the presence of electric currents forming magnetic dipoles.
Which statement correctly lists the electromagnetic waves from highest to lowest energy?
Choose one answer.
a. gamma rays, ultraviolet waves, microwaves
b. radio waves, X-rays, ultraviolet rays
c. microwaves, visible light, gamma rays
d. ultraviolet waves, infrared waves, X-rays
a?
@agent0smith
Answer:
a
Explanation:
In the following figure, what is the value of the potential at points a and b?
(Figure 1)
picture a square.There is a 15 v battery on the left side, a 4ohm resistor on top, a 5v battery on the right side and a 1 ohm resistor on bottom.
I need the potential at the upper right corner, and then the potential at the lower left corner.
The potential at point a is 2V, and the potential at point b is 6V.
The circuit has two voltage sources (9V and 6V) and two resistors (2Ω and 1Ω).
To find the potential at point a (the upper right corner), we can use the voltage divider formula: V_a = (6V × 1Ω) / (1Ω + 2Ω) = 2V
To find the potential at point b (the lower left corner), we can again use the voltage divider formula: V_b = (9V × 2Ω) / (1Ω + 2Ω) = 6V
If we changed the 1Ω resistor to a different value, it would affect the voltage drop across it, and therefore the voltage at point b. For example, if the bottom resistor was 0.5Ω instead of 1Ω, the voltage at point b would be higher than 6V. also if the bottom resistor was 2Ω instead of 1Ω, the voltage at point b would be lower than 6V.
The area around a charged object that can exert a force on other charges objects is an electric_____.
The answer is Electric force.