Answer:
force=mass×acceleration
235=40×a235÷40=aa=5.875m/sThe boy and the bike accelerating at 5.875 m/s^2.
What is acceleration?Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).
Given parameters:
Total mass of the boy and the bike : m = 40 kg.
Net horizontal force = 235 N.
Now according to Newton's 2nd law of motion:
Force = mass × acceleration
⇒ acceleration = Force /mass
⇒ acceleration = 235/40 m/s^2
⇒ acceleration = 5.875 m/s^2.
Hence, they are accelerating at 5.875 m/s^2.
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Ice melts to form water. And water freezes to form ice. Choose the TRUE statement about these changes.
A. Both melting and freezing are physical changes.
B. Both melting and freezing are chemical changes.
C. Melting is a physical change while freezing is a chemical change.
D. Melting is a chemical change while freezing is a physical change.
Answer:
A. Both melting and freezing are physical changes
Explanation:
A chemical reaction occurs when there are new properties but the water keeps being water whether it is freezed or liquid so is not a,c,d.
A physical change occurs when the substance changes its state but no its components or properties so is A is the correct answer.
The true statement is A. Both melting and freezing are physical changes because the substance's composition remains H2O, and only its state changes.
When ice melts to form water or water freezes to form ice, the physical state of water changes from solid to liquid or vice versa, but the composition of water remains the same. This means that the molecules are not changed chemically.
Melting is when a solid becomes a liquid by absorbing heat or ambient temperature increases, during which its shape can change, but its composition does not. Freezing is the reverse process, where a liquid turns into a solid as it loses heat. Both processes are reversible, meaning you can switch from one state to another without altering the chemical identity of the substance. This marks the key characteristic of a physical change.
The nervous system produces a response in your body in about 10 seconds.
O A. True
OB. False
Answer:
False
Explanation:
It takes a bout 0.3 seconded for your body to response
Answer:
⊙false
Explanation:
Hope it help
Please hurry need ASAP!!! The diagram represents a diver's motion from the top of a high diving board into a
pool of water. At what point does the diver have the greatest kinetic energy and the
least potential energy?
1
2
3
4
Answer:
Position 3 has the most kinetic energy
Position 1 has the least potential energy
Explanation:
Kinetic energy: It is the moust because the iver is falling straight down
Potential energy: It is the least because of how he is positioned, it's nearly straight.
The point at which the diver has the greatest kinetic energy and the least potential energy is at point 4.
To explain why, let's break down the concepts of kinetic and potential energy in the context of the diver's motion.
1. Kinetic Energy (KE): This is the energy associated with an object in motion. It depends on both the mass of the object and its velocity. KE = (1/2)mv^2, where "m" is the mass and "v" is the velocity.
2. Potential Energy (PE): In the case of a diver on a diving board, potential energy is gravitational potential energy. It is the energy an object has due to its position relative to a reference point (usually the ground). PE = mgh, where "m" is the mass, "g" is the acceleration due to gravity, and "h" is the height above the reference point.
At point 1, the diver is at the highest point on the diving board. Therefore, the potential energy is at its maximum because the height above the reference point (the water surface) is the greatest. At this point, the diver has little or no kinetic energy because they are momentarily at rest.
As the diver descends from point 1 to point 4, their height above the water decreases, reducing their potential energy. Simultaneously, their velocity increases, which means their kinetic energy also increases.
At point 4, the diver is at the lowest point of their dive, very close to the water surface. Here, their potential energy is minimal, as they are close to the reference point. At the same time, their velocity is at its maximum, resulting in the highest kinetic energy.
In conclusion, point 4 represents the moment of the greatest kinetic energy and the least potential energy because the diver is in rapid motion close to the water's surface, having converted most of their potential energy into kinetic energy during the dive.
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Which one is made up of one or more molecules
A worker pushes a box across the floor to the right at a constant speed with a force of 25N. What
can you conclude about the box? *
An unbalanced force of 25N is acting on the box.
Friction between the box and the floor is 25N to the left
The net horizontal force acting on the box is 50N.
Answer:
Friction between the box and the floor is 25N to the left
Explanation:
There are two forces acting on the box along the horizontal direction:
- The force of push applied by the worker, in the forward direction, F
- The force of friction, [tex]F_f[/tex], acting in the opposite direction (backward)
So the net force acting on the box is
[tex]F_{net}=F-F_f[/tex]
According to Newton's second law of motion, the net force on an object is equal to the product between its mass (m) and its acceleration (a), so we can write:
[tex]F_{net}=ma[/tex]
And so
[tex]F-F_f = ma[/tex]
However, in this case the box is moving at constant speed; this means that its acceleration is zero:
[tex]a=0[/tex]
Therefore we have:
[tex]F-F_f=0[/tex]
Which means
[tex]F_f=F[/tex]
And since we are told that
[tex]F=25 N[/tex]
This means that the force of friction is also 25 N:
[tex]F_f=F=25 N[/tex]
Answer:
C.Friction between the box and the floor is 25N to the left.
Explanation:
One can conclude that the friction between the box and the floor is 25N to the left.
Frictional force is a force that opposes motion of a body. It acts in the opposite direction as the net force applied on a body.
According to newton's third law of motion "action and reaction are equal and opposite in magnitude and direction".The action force is to right and the reaction force is to the left.A bowling ball has a mass of 1.7 The ball leaves a bowler's hand at a speed of 7.0 m/s calculate the kinetic energy of the bowling ball (I NEED QUICK ANSWERS PLEASE)
Answer:
the answer is 41.65 J
Final answer:
The kinetic energy of a bowling ball with a mass of 1.7 kg and a velocity of 7.0 m/s is calculated using the kinetic energy formula KE = 1/2 mv^2, resulting in a kinetic energy of 41.65 joules.
Explanation:
The subject of this question is physics, specifically covering the topic of kinetic energy which is a part of mechanical energy. The grade level of this question is high school. To calculate the kinetic energy of the bowling ball, we use the kinetic energy formula:
KE = ½ mv² where KE is kinetic energy, m is mass in kilograms, and v is velocity in meters per second.
Plugging in the given values (mass m = 1.7 kg, velocity v = 7.0 m/s), the calculation is as follows:
KE = ½ × 1.7 kg × (7.0 m/s)²
KE = 0.85 kg × 49 m²/s²
KE = 41.65 joules
So, the kinetic energy of the bowling ball is 41.65 joules.
Which object would a geologist date using carbon-14 dating?
A.a dinosaur fossil
B.a woolly mammoth fossil
C.an ancient volcanic rock
D.an igneous rock
Answer:
B.) A woolly mammoth fossil
Explanation:
Carbon-14 dating is normally used to find the age of a once-living object.
C and D are not accurate because they both refer to types of igneous rocks -- only sedimentary rocks can be used for Carbon Dating.
A isn't accurate because dinosaurs lived a very, very long time ago, therefore, the isotopes wouldn't be detectable during modern times.
Though woolly mammoths lived a long time ago, it is a short time compared to the long time gap between dinosaurs and modern era. Radioactive isotopes may still be present in a woolly mammoth fossil sample.
What is one difference between an electromagnetic wave and a mechanical wave?
A
An electromagnetic wave can travel through a vacuum. A mechanical wave must have a medium to travel through.
B
An electromagnetic wave moves parallel to the direction of the wave's travel. A mechanical wave can move only perpendicular to the direction of the wave's travel.
C
An electromagnetic wave moves perpendicular to the direction of the wave's travel. A mechanical wave can move only parallel to the direction of the wave's travel.
D
A mechanical wave can travel through a vacuum. An electromagnetic wave must have a medium to travel through.
An electromagnetic wave can travel through a vacuum without a medium, while a mechanical wave requires a medium to propagate. The answer is option D.
One difference between an electromagnetic wave and a mechanical wave is how they propagate through space. An electromagnetic wave can travel through a vacuum without the need for a medium, whereas a mechanical wave must have a medium like air, water, or solids to travel through. This is because electromagnetic waves, which include light waves, are composed of oscillating electric and magnetic fields that can generate each other, whereas mechanical waves, like sound waves, rely on the vibration of particles in a medium to propagate.
Explain why the stars look different between Jane and John
How much work is done by gravity when a pine cone (of mass 50g) falls from the top of a tree, 9 m high?
Answer: 4.41 joules
Explanation:
Given that:
work is done by gravity = ?
Mass of pine cone (m) = 50g
Convert mass in grams to kilograms
Since 1000g = 1kg
50g = (50/1000) = 0.05kg
Height of tree (h) = 9 m
Apply the formula for work,
Work = mass x acceleration due to gravity x height
Acceleration due to gravity has a value of 9.8m/s^2
Work = mgh
Work = 0.05kg x 9.8ms^2 x 9m
Work = 4.41J
Thus, 4.41 joules of work is done by gravity.
Answer:
4.5 J
Explanation:
I took the test
29. If you traveled to Mars, your mass would be
than your mass on Earth. *
If you traveled to Mars, your mass would be exactly, precisely equal to your mass on Earth, PROVIDED you did not relieve the boredom of space travel by eating too many astronaut steaks along the way.
The only things that can affect your mass are your personal diet, exercise, sleep, and stress habits.
Your mass has nothing to do with gravity. Your WEIGHT has.
5. Because velocity is a _____ quantity, ______ matters.
Answer:
First blank is Speed, The Second Blank is Mass
Explanation:
Velocity is always speed and for mass thats just what they taught us>>>
Because velocity is a vector quantity, direction matters.
What is velocity?Velocity is the rate of change of displacement. It is essentially a vector quantity.
Speed of an object moving can never be negative. The velocity of a moving object can be zero.
Speed gives us an idea of how fast an object is moving whereas velocity not only tells us its speed but also tells us the direction the body is moving in.
Initial velocity describes how fast an object travels when gravity first applies force on the object. On the other hand, the final velocity is a vector quantity that measures the speed and direction of a moving body after it has reached its maximum acceleration.
The motion with constant velocity is the simplest form of motion.
What is vector quantity?Vector is the quantity that has both magnitude and direction. For example, displacement, force, torque, momentum, acceleration, velocity, etc.
Thus, velocity has speed as well as direction, so it is vector quantity.
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After a recent experiment, a meteorologist noticed that the computer simulation varied from the actual experiment. What should the meteorologist do?
a: Repeat the experiment several times in order to verify the results
b: Adjust the computer's program so it matches the actual results.
c: Ignore the actual results as inaccurate because computers are very precise
d: Ignore the simulation as inaccurate because of a possible computer virus
Answer:
a: Repeat the experiment several times in order to verify the results
Explanation:
Computer simulations are models. They follow specific instructions and act based on those set of parameters.
Models study a part of the real world and makes useful inference from them. It is often common place to observe discrepancies between computer simulation and what is found in the actual experiment.
The most efficient thing to do is to run and repeat the experiment several times so as to verify the result. It will also help the precision and to know how accurate the readings might be.
The diagram below illustrates the law of reflection.
Incoming
light
Mirror
According to the law of reflection, which statement must be true?
The measure of angle A equals the measure of angle B.
The measure of angle B equals the measure of angle C.
The measure of angle A equals the measure of angle C.
-- -- ------ --- ----
Answer: B) The measure of angle B equals the measure of angle C.
True or False? Sometimes, substances can be added to a reaction to cause the reaction to start or speed up. These are not considered reactants or products. They are called CATALYSTS.
A) True
B) False
Answer:
A catalyst is a chemical substance that affects the rate of a chemical reaction by altering the activation energy required for the reaction to proceed. This process is called catalysis. A catalyst is not consumed by the reaction and it may participate in multiple reactions at a time.
Explanation:
a
Find the acceleration of the change in personality is 5M/S and the time is 10 seconds
There is a misspelling: "change in personality is 5M/S". It should be "change in velocity is 5m/s"
Answer: 0.5 m/s^2
Explanation:
acceleration = ?
change in velocity = 5m/s
Time = 10 seconds
Acceleration is the rate of change of velocity per unit time. it is measured in metres per second square.
i.e Acc = (change in velocity) time
Acc = 5m/s / 10 seconds
Acc = 0.5 m/s^2
Thus, the acceleration is 0.5 m/s^2
I need help fast pleaseeee
I h abitats is a boy or a party for me and you Friday the 13th to make a hoodie is better single
The greater the force squeezing 2 surfaces together, the smaller the
friction force. *
True
False
Answer:
False
Explanation:
It is false because the greater the force, the greater the friction.
A 0.450-kg soccer ball has a kinetic energy of 119 J. What is the velocity of the
soccer ball?
Answer: 23m/s
Explanation:
Given that:
Mass of soccer ball = 0.450kg
kinetic energy = 119 J
velocity of the soccer ball = ?
Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the velocity (v) by which it moves
i.e K.E = 1/2mv^2
119J = 1/2 x 0.450kg x v^2
119J = 0.225kg x v^2
v^2 = 119J / 0.225kg
v^2 = 528.9
To get the value of velocity, find the square root of v
v = √528.9
v = 22.997m/s (Round result to 23)
Thus, the velocity of the soccer ball is 23m/s
An ion contains 8 protons, 10 electrons, and 7 neutrons. What is the mass of the ion?
Answer: 15
Explanation:
The mass of the ion is the sum of the protons and neutrons inside its nucleus.
i.e Mass number = protons + neutrons
Mass number = 8 protons + 7 neutrons
= 15
Furthermore, since the number of protons differ from the number of electrons by 2, the ion was formed when its atom gained 2 electrons. Thus, it is a negatively charged ion (anion) with a mass of 15
Calculate the braking distance for a vehicle traveling at 30 mi/h (13.4 m/s) with an acceleration of - 9.0 (m/s)/s while breaking.
Answer:
Braking distance of vehicle is 9.97 m
Explanation:
It is given initial velocity of the vehicle u = 13.4 m/sec
Acceleration of the vehicle [tex]a=-9m/sec^2[/tex]
As the vehicle finally stops so final velocity of the vehicle v = 0 m/sec
We have to find the braking distance s
From third equation of motion
[tex]v^2=u^2+2as[/tex]
[tex]0^2=13.4^2+2\times -9\times s[/tex]
s = 9.97 m
So braking distance of the vehicle is 9.97 m
A main goal of most environmental scientists is to achieve _________________________.
Group of answer choices
sustainability
supply and demand
biodiversity
cost-benefit balance
Answer:
The answer is biodiversity
Explanation:
can any help me with this ?
Answer:
Sure i can help you
Explanation:
6) The force pairs are drawn on the diagram to the left.
a. What is the action force acting on
The Rocket pushes out gas
b. What is the reaction force acting on?
Gas on the rocket
C. If the forces are equal and opposite why does the rocket ship move?
Answer: Rocket Is its own system, So gas creates outside force on the rocket
How far does a car in 90 sec if it is traveling at a speed of 55m/s show equation
Answer:
4950 meters
Explanation:
Recall that the formula for the speed (v) is given by the quotient of the distance traveled (d) divided by the time (t) it took to cover that distance:
[tex]v=\frac{d}{t}[/tex]
Therefore, for this case in which the car travels at 55 m/s for 90 seconds, we can replace these values in the formula, and solve for the distance covered:
[tex]v =\frac{d}{t} \\55 \frac{m}{s} =\frac{d}{90\,s} \\d=55*90 m\\\\d=4950\,m[/tex]
Closer to a point charge, the electrostatic field created is.
A. Stronger
b . Weaker
Answer:
stronger
Explanation:
its stronger because I don't have a good life for you guys but if I don't have a chance for it I can do it for you and I can get it to work on my own and then I can get a better idea
Final answer:
The electrostatic field created by a point charge is stronger the closer you are to the charge, due to the inverse relationship between field strength and distance. So the correct answer is option A.
Explanation:
The electrostatic field created by a point charge is stronger the closer you are to the charge. This is because the strength of the electrostatic field depends on the distance from the point charge, as described by Coulomb's Law. As the distance between charges decreases, the electrostatic force increases, resulting in a stronger field. When considering two unlike charges, the fields add together and become even stronger in the region between them because the fields from each charge are in the same direction. Conversely, the field is weaker at large distances, where the fields of individual charges may oppose each other, leading to a net effect of a weaker field. Examples from figures showing the electric fields demonstrate that field lines are closer together where the field is stronger, and farther apart where the field is weaker.
What type of conversion is taking place when natural gas is used to heat water?
a chemical energy into thermal energy
b. thermal energy into mechanical energy
mechanical energy into electromagnetic energy
d electromagnetic energy into chemical energy
Please select the best answer from the choices provided
OOOO
When natural gas is used to heat water, a conversion of chemical energy into thermal energy is taking place. The Option A.
What type of energy conversion is it?In this process, natural gas which contains stored chemical energy undergoes combustion in a water heater. This combustion releases heat energy which is transferred to the water, raising its temperature.
The chemical energy in the natural gas is transformed into thermal energy leading to hot water for various domestic purposes such as bathing and heating.
This conversion helps in household heating systems and makes efficient use of the chemical energy stored in natural gas to provide thermal comfort and convenience in homes.
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The conversion taking place when natural gas is used to heat water is 'chemical energy into thermal energy'. The energy from the chemical bonds in natural gas is released and changed to heat, which warms the water.
Explanation:When natural gas is used to heat water, the type of conversion taking place is 'a chemical energy into thermal energy'. This happens because natural gas, a fossil fuel, is burned in this process. The energy stored in the chemical bonds of the gas is released and converted to thermal energy (heat), which is used to warm up the water.
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why do scientists use two different models of light
Answer:
To distinguish results based on the only two variables of
awareness.
Explanation:
Final answer:
Scientists use two models of light: the wave model for interference and color observations, and the particle model for emission and absorption processes.
Explanation:
Scientists use two different models of light, namely the wave model and the particle model, because each is useful in explaining different phenomena associated with light.
While the wave model of light is excellent for describing scenarios such as the bending of light around edges, interference patterns, and observations of color, the particle model explains how light is emitted or absorbed by material.
Moreover, ray tracing, a more straightforward approach, is used for predicting images formed by lenses and mirrors, where light is interacting with objects much larger than a wavelength of light.
According to Essential Knowledge 6.F.4, the nature of light requires that different models are most appropriate at different scales. Furthermore, in the realm of quantitative models, a model of light propagation can predict outcomes that are testable and applicable in fields like lithography and sample analyses.
Thus, scientists often select a model based on the scale and context of the phenomenon they are investigating.
How do lines of latitude affect how direct or indirect the Sun’s rays are on the Earth?
the air pressure in a car is 210kPa at a temperature of 26°C. What is the temperature of the air in the tyre of the pressure of 220kPa? [assume that the volume of the air in the tyre is constant]
Answer: 313.24K
Explanation:
Given that:
Initial air pressure P1 = 210kPa
Initial Temperature T1 = 26°C
(Since, the SI unit of temperature is Kelvin, convert temperature in celsius to kelvin
26°C + 273 = 299K)
Final temperature T2 = ?
Final pressure P2 = 220kPa
Since, pressure and temperature are involved while volume is constant, apply the formula for pressure law
P1/T1 = P2/T2
210kPa/299K = 220kPa/T2
Cross multiply
210kPa x T2 = 220kPa x 299K
210 x T2 = 65780
T2 = (65780/210)
T2 = 313.24K
Thus, the temperature of the air in the tyre is 313.24K
Students created a drawing to represent waves traveling along a slinky spring.
Which of the following accurately describes the properties of a wave if the students decided to increase the energy transmitted by the wave?
A) The frequency of the wave would increase and the wavelength would decreases
B) The frequency of the wave would decrease and the wavelength would increases
Eliminate
C) The frequency of the wave would increase and the wavelength would increases
D) The frequency of the wave would decrease and the wavelength would decreases
Answer:
The answer is A.
Explanation:
Since you're increasing the energy, the frequency would start increasing. The wavelength would start decreasing, since you're putting more energy into the slinky and making it go faster and faster.