Which are characteristics of electromagnetic waves? Check all that apply.
They travel only through matter.
Waves with a higher frequency have a shorter wavelength.
Waves with a higher frequency have a longer wavelength.
They all move at the same speed.
They can travel through space.
Answer:
2,4,5
Explanation:
Answer:
2,4,5
Explanation:
I got it right on edge 2021
A book is sitting on a desk. If the surface area of the book's cover is 0.05 m², and atmospheric pressure is 100.0 kPa, what is the downward force of the atmosphere on the book
Answer:
5000N
Explanation:
Given parameters:
Area of the book cover = 0.05m²
Atmospheric pressure = 100kPa = 100 x 10³Pa
Unknown:
Downward force of the atmosphere on the book = ?
Solution:
Pressure is defined as the force per unit area on a body.
So;
Downward force = Atmospheric pressure x Area
Downward force = 100 x 10³ x 0.05 = 5000N
If an object is not moving, does that mean there are no forces acting up on it? Why or why not?
Answer:
If an object is at rest, then there are no forces acting upon the object.
Explanation:
It would take an unbalanced force to keep an object in motion at a constant velocity. It is the natural tendency of all objects to eventually come to a rest position.
A student carries a backpack for one mile , another student carries the same back pack for two miles . Compared to the first student , how much work did the second student do ?
Answer:
he did twice as much since the first student carried the backpack for 1 mile whilst the second one carried it for 2 miles
Explanation:
Answer:
2miles-1mile
the second person carried the for one mile longer.
So as your sentence you would sat
Compared to the first person the second person carried the backpack one mile longer.
What are some ways to deal with stress? HELP
Answer:
dear the other side is the hardich the value that indicates that the other hand if one of triangle ABC news and information or have any further information on the value of x the ki friend my dear the ki aadami you are girl or by phone
Answer:
play games
do meditation
take a long breath
be calm and relax
share your stress
get help from elders
As wavelength increase, the frequency of the wave increases / decreases.
Answer:
Hey heres your ans
Explanation:
Wavelength will increase
Tq
A 5Kg ball rolling to the right at a velocity of 5m/s hits a stationary 10Kg ball. It is an elastic collision and the final velocity of the 5Kg ball is 0m/s. What is the final velocity of the 10Kg ball?
Answer:
magnitude of v = 2.5 m/s, and in the same direction as the initial velocity of the 5 kg ball.
Explanation:
We use conservation of linear momentum in an elastic collision to solve for the unknown velocity v:
Pi = Pf
5 kg * 5 m/s + 10 kg * 0 m/s = 5 kg * 0 m/s + 10 kg * v
25 kg m/s = 10 kg * v
v = 25/10 m/s
v = 2.5 m/s
and in the same direction as the initial velocity of the 5 kg ball.
the waves that heat a cup of water in the microwwave are an example of electromagnetic waves. True or False
The phrase 10 m per second squared describes the what
Answer:
acceleration that is caused by gravity
Explanation:
What is the speed of a baseball that travels 49 meters in 2.8 seconds?
(I will mark first answer Brainliest!)
Answer:
49 meter per second is the speed of the baseball
Explanation:
thank me later
2) A bully is pushing a boy against a locker as shown with a force of
500N. The angle between his arms and the ground is 40°. Draw a free-body diagram of
the boy and then find the normal force between the boy and the wall.
HELP
Answer:
pull out the 9
Explanation:
How many half lives will it take for 300 grams of Carbon-14 to decay to 18.75 grams?
Answer:
16
Explanation:
300/18.75
What does psychophysics study?
unusual discoveries in laboratory experimentations
the laws of physics and how believable they are
people's reactions and perceptions to stimuli
Answer:
people's reactions and perceptions to stimuli.
Explanation:
Psychophysics can be defined as the scientific study of people's reactions and perceptions to stimuli.
Stimulus can be defined as an obvious change in either the chemical or physical structure of an organism' environment (either external or internal). Thus, all living organisms (humans) respond to changes in their environment and consequently, an appropriate response or reaction is made. Also, stimulus arising from within the organism is known as internal stimulus while those from its environment are known as the external stimulus.
In organisms, the specialized cells that detect stimulus are generally known as sensory receptors while a group of these receptors is referred to as sense organ.
Hence, psychophysics is a branch of psychology and it is typically focused on determining the effects of stimuli on the mental health or processes of humans.
Answer:
study of people's reactions and perceptions to a stimulus.
Explanation:
Before the emergence of psychology, psychophysics was the more common practice. Psychophysics is the study of people's reactions and perceptions to a stimulus. For example, when you hear a bell ring, do you act startled, blink your eyes, turn your head, or do nothing? Psychophysicists were interested in people's five senses and how those senses responded to stimulation from elsewhere. Tests were administered to people to try to understand mental phenomena.Psychophysicists wanted to know what people's reactions would be. For example, if a bell rang twenty times, how well did a person hear that sound and did the person find that sound pleasant?
Tell me what the
forces are.
PLZ LOOK AT THE PHOTO AND TELL ME THE ACTION AND REACTION FORCES ASAP
WILL MARK BRAINLIEST
Answer:
upward thrust, makes the rocket go up
and kentic energy, you swing and the energy that was built up before you hit the ball was transferred
Explanation:
In modified PE football, the quarterback can only run with the ball if
A The quarterback has no open receivers
B Time runs out
C Another player on the offense touches the ball before the play starts
D it is 4th down
Answer:
its c i just did the test
Explanation:
can somewon help me with this qustion?
A 2000 Kg car is driving 15 m/s. It drives head-on into a giant spring attached
to a brick wall. The spring compresses 8 meters after the impact. What is the
spring coefficient of the giant spring? *
Answer:
The spring constant is k=7031.25
Explanation:
We start by using the conservation of mechanical energy:
Ui + Ki = Uf + Kf
the Ui (initial potential energy) is zero since the spring is relaxed.
In the final situation, the Kf (final kinetic energy is zero since the car and spring are NOT in motion)
Then we have:
[tex]K_i=U_f\\\frac{1}{2} m*v^2=\frac{1}{2} k*(\Delta x)^2\\\frac{1}{2} 2000*15^2=\frac{1}{2} k*(8)^2\\k=7031.25[/tex]
17. A ball falling from a building has a kinetic energy of 2000 J and potential
energy of 2376 J. What is the mechanical energy of the ball?
Imc
Answer:
C. 4736J
Explanation:
The mechanical energy of ball is the sum of its kinetic energy and potential energy at any point;
Mechanical energy = kinetic energy + potential energy
Given:
kinetic energy = 2000J
potential energy = 2376J
So;
Mechanical energy = 2000J + 2376J = 4736J
PLEASE HELP 100 POINTS
If the simple machine reduces the amount of force, what must be increased? (Think of using an inclined plane)
the size of the simple machine
the speed of the input force
the work the simple machine performs
the distance over which the force is applied
If the simple machine reduces the amount of force, what must be increased the size of the simple machine.
What is force?A force in physics is an effect that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
An object that transfers and alters force is a machine. Machines come in a variety of forms, such as incline planes, levers, wheel and axles, pulleys, and gears. • The mechanical advantage provided by a machine is the same as the output force. divided by the input force (load)
If the simple machine reduces the amount of force, what must be increased the size of the simple machine.
To learn more about force refer to the link:
brainly.com/question/13191643
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A horse pulls a wagon that weighs 10 times more than the horse. The horse pulls with a force of 500N to move the wagon forward. How much force does the wagon exert on the horse? *
a. More than 500N
b. It depends on the size of the horse
c. Less than 500N
d. 0N because a wagon cannot exert a force
e. 0N because the wagon is moving
f. 500N
Answer:
f. 500N
Explanation:
The force exerted by the wagon on the horse is 500N directed in the opposite path .
This is premised on the Newton's third law of motion which states that "action and reaction forces are equal and opposite in direction".
So, as the action force of 500N is used by the horse to drag the wagon, the wagon also exerts an oppositely directed force of 500N on the horse.
This way, the acceleration can continue.
3. Canopus is 313 light years from Earth. How old is the light that we are currently seeing?
Answer:
lícita; de navegar y comerciar; de peticionar a las autoridades; de entrar, permanecer, transitar y salir del territorio argentino; de publicar sus ideas por la prensa sin censura
An apple falls off a roof .It takes the apple 15.7 seconds to hit the floor . How far did the apple fall?
Answer:
8.83m below I hope I got it
What is the force of an object that has a mass of 42 kg and an acceleration of 3 m/s22?
Answer:
[tex]\boxed {\boxed {\sf 126 \ Newtons}}[/tex]
Explanation:
According to Newton's 2nd Law of Motion, force is the product of mass and acceleration.
[tex]F=ma[/tex]
The mass is 42 kilograms and the acceleration is 3 meters per square second.
[tex]m= 42 \ kg \\a= 3 \ m/s^2[/tex]
Substitute the values into the formula.
[tex]F= 42 \ kg * 3 \ m.s^2[/tex]
Multiply.
[tex]F= 126 \ kg*m/s^2[/tex]
1 kilogram meter per square second is equal to 1 Newton. The answer we calculated is equal to 126 Newtons.[tex]F= 126 \ N[/tex]
The object's force is 126 Newtons.
What centripetal force is needed to keep a 7kg mass moving in a circle of 4 meters radius at 15m/s
Answer:
We conclude that the centripetal force needed to keep a 7kg mass moving in a circle of 4 meters radius at 15m/s is 393.75 N.
Explanation:
Given
Mass m = 7 kgRadius r = 4 mVelocity v = 15m/sTo determine
We need to determine the centripetal force needed to keep a 7kg mass moving in a circle of 4 meters radius at 15m/s.
We know a centripetal force acts on a body to keep it moving along a curved path.
We can determine the centripetal force using the formula
[tex]F_c=\frac{mv^2}{r}[/tex]
where
[tex]m[/tex] is the mass[tex]v[/tex] is the velocity[tex]r[/tex] is the radius[tex]F_c[/tex] is the centripetal forcesubstitute m = 7, r = 4, and v = 15 in the formula
[tex]F_c=\frac{mv^2}{r}[/tex]
[tex]F_c=\frac{7\left(15\right)^2}{4}[/tex]
[tex]F_c=\frac{1575}{4}[/tex]
[tex]F_c=393.75[/tex] N
Therefore, we conclude that the centripetal force needed to keep a 7kg mass moving in a circle of 4 meters radius at 15m/s is 393.75 N.
What would happen to the tides of the moon was twice as massive it is currently?
Answer:
the tides would be twice as big as they are now and the world would flood
Explanation:
The tides would be twice as massive as currently if moon was twice as massive it is currently.
What is tidal force?The tidal force is a gravitational effect that stretches a body along a line towards the center of mass of another body due to a gradient in the gravitational field from the other body.
A body stretches as a result of this disparity. As a result, in addition to being a byproduct of the gravitational field, the tidal force is also referred to as the differential force.
The nearest side is pulled more strongly than the farthest side because the gravitational field imposed on one body by another is not consistent across its portions.
As tidal force is a kind of gravitational force, it linearly depends on the mass of the moon. So, the tides would be twice as massive as currently if moon was twice as massive it is currently.
Learn more about tidal force here:
https://brainly.com/question/6762160
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if the police are chasing a runaway car why is knowing the velocity of the car important
If you only know its speed, that's not enough information to catch it. You could even chase it at DOUBLE that speed, and you'd never catch it if you were chasing in the wrong direction.
You also have to know the DIRECTION the runaway car is going, so that you can chase in the same direction.
Now that you know its speed AND direction, you know its velocity. You need that information to have any chance of catching it.
Classify the following situations into contact and non-contact forces.
(a) Applying brakes in a vehicle
(b) a coconut falling from a coconut tree
(c ) the planets revolving around the sun
(d) a ball is rolling on ground.
Answer: Contact force
a. Applying break in a vehicle.
d. The speed of ball rolling on ground is reduced
Non contact force
b. A coconut falling from a coconut tree.
c. The planets revolving around the sun.
Explanation:
The contact force is the force which exerts when one object or entity comes in contact with other object or entity. For example, on application of break the vehicle stops, the force is applied on the breaks to stop the vehicle. The ball rolling on the ground the speed reduces so the application of force on the ground also reduces.
The non contact force is the force one object exerts on the other without coming in direct contact with the other object. The force exerted by one object on other due to gravity is a non contact force. The coconut falling on the ground and planets revolving around the sun are examples of non contact force due to gravity.
Help plz I’ll mark brainliest
Answer:
concave
Explanation:
the middle of the concave lens is narrow and the edges are flattened.
Look at the graph. How many minutes is the sample COMPLETELY a liquid?
Answer:
2 minutes
Explanation:
From the graph, it takes 2 minutes for the piece of ice to go to the completely liquid phase.
if the mass of the object is tripled and the speed is doubled then the kinetic energy will change by a factor of
Answer:
New kinetic energy = 12 times of the initial kinetic energy.
Explanation:
The kinetic energy of an object is given by :
[tex]K=\dfrac{1}{2}mv^2[/tex]
Where
m is mass of the object
v is speed of the object
ATQ,
If the mass of the object is tripled, m' = 3m
Speed is doubled, v' = 2v
New kinetic energy will be:
[tex]K'=\dfrac{1}{2}m'v'^2\\\\K'=\dfrac{1}{2}\times 3m\times (2v)^2\\\\=\dfrac{1}{2}\times 3m\times 4v^2\\\\=12\times \dfrac{1}{2}mv^2\\\\K'=12\times K[/tex]
So, the new kinetic energy will become 12 times of the initial kinetic energy.