Final momentum of the box = (mass) x (speed) = (10kg) x (25m/s) = 250 kg-m/s .
Impulse delivered by the force = final momentum of the box = (force) x (time)
250 kg-m/s = (force) x (4 sec)
Divide each side by (4 sec):
Force = (250 kg-m/s) / (4 sec)
Force = (250/4) kg-m/s²
Force = 62.5 Newtons
Given:
mass of the box (m):10 Kg
u(initial velocity)=0.
v(final velocity)=25m/s
t(time taken)=4 sec
Now we know that
v=u+at
Where v is the final velocity which is measured in m/sec
u is the initial velocity which is measured in m/sec
a is the acceleration which is measured in m/s^2
t is the time measured in sec
Substituting the given values in the above formula we get
25=0+ax4
a=6.25 m/s^2
Now we also know that
F= mxa
Where F is the force applied on the object which is measured in N.
m is the mass of the object measured in Kg
a is the acceleration measured in m/s^2.
Now substituting the values in the above formula we get
F=mxa
F=10x6.25=62.5 N
what is the total precentage of radiation that is reflected by earths atmosphere
Around 48 % of the incoming solar energy passes through the atmospheric layer of the earth. The water vapor,ozone and dust present in the atmosphere absorbs 23 percent of incoming solar energy .Thus about 71% of the incoming solar radiation is absorbed by the earth. The rest 29% of the incoming solar radiation is reflected back into the space.
If you know the distance of an earthquake epicenter from three seismic stations, how can you find the exact location of the epicenter of the earthquake.
You draw 3 circles around the stations with the size of the circle equal to the distance from the earthquake. Then you simply find where the edge circles all overlap.
A sailboat starts from rest and accelerates at a rate of 0.13 m/s2 over a distance of 458 m.
(a) Find the magnitude of the boat's final velocity.
m/s
(b) Find the time it takes the boat to travel this distance.
s
Given:
u(initial velocity): 0
a(acceleration): 0.13 m/s∧2
distance = 458 m
Now s= ut +1/2 (at∧2)
Substituting from the given values we get
458= 0+ 1/2(0.13 x t∧2)
t = 83.94 secs
Now v (velocity)= u+ at
Substituting for t as 83.94 secs and for a and u from the given values we get:
v= 0+0.13 x t
v= 0.13 × 83.94
v=10.91 m/s
Therefore the final velocity of the boat is 10.91 m/s and the time taken for the boat to travel 458 m is 83.94 secs
Medical equipment uses ultrasound to process images using _________. resonance
the Doppler effect
constructive interference
destructive interference
The medical equipment used for ultrasound imaging is based on Doppler's effect.
The ultrasound imaging process uses high frequency radio waves to view inside images like tendons,muscles,joints,blood vessels etc.
In this process the transmitted pulse produces a Doppler's shift when it interacts with the moving reflector. Here we have to consider the moving reflector as the moving source.The moving reflector will produce an echo which will be received by the transducer.The transducer acts as stationary observer.
The whole process can be explained as below-
1-The ultrasound machine transmits the high frequency signal to the body through a prove.The sound will be reflected by the boundary of tissue and received by the probe.Some sound waves penetrate more into inside part of the body.
2-The received reflected sound will be allowed to enter into the machine which calculates the distance between various tissue and forms an image based on Doppler's shift.
Hence the correct answer is Doppler's effect.
Answer:
the Doppler effect
Explanation:
The frequency of the sound waves used in Doppler ultrasound are high frequency sound waves. These are used to observe and measure the amount of blood that is flowing through the arteries and veins . The veins that supply the blood to arms and legs are studied using the Doppler ultrasound technology.
The ultrasound waves can accurately measure the movement of the red blood cells, since their movement can produce a change in the frequency of the sound waves that are reflected.
how far is the region from the equator or helps control climate
could you please specify?
Which BEST compares the motions of dots C and D?
A) Both C and D are speeding up.
B) Both C and D are moving at a constant velocity.
C) C is speeding up and D is moving at a constant velocity.
D) C is slowing down and D is moving at a constant velocity.
As per the graph there is a motion map which denotes the motion of two dots C and D respectively.
As per the graph the motion of dot C is non uniform .It is so because it is covering unequal distance in equal interval of time.Its speed is increasing at every instant .Hence it is speeding up.
The motion of dot D is uniform .It covers equal distance in equal interval of time.Hence the dot D is moving at a constant velocity.
Hence out of four options given in the question,the third option i.e C is the correct answer .
This diagram represents a top-down view of an experiment on a table. The 250g and 100g masses are falling and are pulling the block.
What is the location and minimum number of masses that would have to be added to the picture above to cause the block to move only toward the bottom (straight down)?
A. 1000g mass on bottom
B. 500g mass on bottom
C. 250g mass on the left
D. 250g mass on left and 200g mass on bottom
Answer:
C. 250g mass on the left
Explanation:
As the given figure there are two forces on the box placed on the table
1) due to 250 gram there will be a force which will pull it towards right
2) due to 100 g mass which will pull it downwards
now if we wish to move the block only in downward direction then we have to add a force on the block that will counterbalance the force towards right direction
so here it must have a force towards left which will balance the force of 250 g mass towards right
so it would be
C. 250g mass on the left
How is a scientific theory different from a hypothesis? A theory is an explanation of a single phenomenon; a hypothesis is a question that can be tested. B. A theory is a well-tested explanation; a hypothesis is a possible answer that needs to be tested. C. A theory and a hypothesis are both educated guesses, but a hypothesis is not proven. D. A theory explains a scientific law; a hypothesis explains a theory.
its dddddddddddddddddddddddd
While Bob is demonstrating the gravitational force on falling objects to his class, he drops an 1.0 lb bag of feathers from the top of the science building. Determine the distance the bag has traveled after falling for 1.5 seconds assuming it has reach free fall and given the gravitational acceleration of 9.8 m/sec2.
A) 7.4 m
B) 11 m
C) 15 m
D) 22 m
Answer:
Option B, 11 m is the correct answer.
Explanation:
We have equation of motion ,[tex]s=ut+\frac{1}{2} at^2[/tex] , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.
In this case u = 0 m/s , t = 1.5 seconds , a = acceleration due to gravity = [tex]9.8m/s^2[/tex] , we need to find displacement
Substituting
[tex]s=0*1.5+\frac{1}{2} *9.8*1.5^2\\ \\ s=11.025m[/tex]
So option B, 11 m is the correct answer.
Answer:
11
Explanation:
What is the proper term for the lowest natural frequency that is produced by a vibrating object, such as an instrument?
i believe your looking for this word ?? "fundamental".
Answer:
Fundamental frequency
Explanation:
Fundamental frequency is the lowest frequency which produced due to the oscillation of the body. This frequency is different from other higher frequencies. If the tube is closed at one end, the velocity of sound divided by 4 times the length of the tube gives the fundamental frequency. The higher frequencies can be obtained by integral multiple of the fundamental frequency.
Which tools collect images during space exploration? Check all that apply. rovers orbiters satellites space shuttles space stations
Answer:
1. Rovers- These are vehicles which are designed to move on the surface on any celestial body and collect samples, data and images. Sometimes, these can be used to transport mission crew members.
2. Orbiters- These are spacecrafts designed to orbit any celestial body and collect data in form of images.
3. satellites- artificial satellites are placed in the orbit of celestial bodies for various purposes. There are various types of satellites like communication satellite, weather satellites, space telescopes. These collect images and data inform of signals.
4. space stations: It is a satellite where research and experiments take place. Images are also collected for research purpose.
Space shuttle is a wrong option because it is just a vehicle to transport these satellites and probes into the space and place in the orbit or surface of celestial body.
Answer:
rovers
satellites
space stations
Explanation:
i just took the test
Use the diagram to answer each question.
Why are the field lines of the magnetosphere farther apart on the side of Earth facing away from the sun?
The answer:
the field lines of the magnetosphere farther apart on the side of Earth facing away from the sun Because of the solar wind (the corona) which is released from the upper atmosphere of the Sun. it is a stream of charged particles.This plasma consists of alpha particles electrons, and protons. And has a kinetic energy between 0.5 and 10 keV. This solar wind which is ionized is distorting the Earth's field so this affected the field lines of the magnetosphere farther apart on the side of Earth facing away from the sun.
What is the value of the impulse obtained from the graph?
C) 9 kilogram meters/second
Explanation:
The impulse is defined as the integral of the force over the time:
[tex]J=\int F dt[/tex]
in a force-time graph, the impulse corresponds to the area under the curve. Therefore, in this case we can calculate the impulse by finding the area of the triangle.
The base is 3 s, while the height is 6 N, therefore the area (and the impulse) is
[tex]J=\frac{(3 s)(6 N)}{2}=9 kg m/s[/tex]
Answer:
C) 9 kilogram meters/second
Explanation:
Correct answer on plato/edmentum
Which of the following is the equation for gravitational potential energy?
A. PE = mgh
B. PE = mv
C. PE = 1/2(mv)
D. PE = Fd
B is momentum. It's a quantity of motion, or "how much stuff is moving"
C is *almost* kinetic energy but it's missing an exponent of 2 on the velocity, v.
D is an amound of work done in moving something a distance d while applying a constant force F.
That leaves A. This is the potential energy of an object of mass m, in a gravitational acceleration g, at a height h above the reference point (usually the ground)
Answer is A- mgh.
The equation for gravitational potential energy is mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m/s ∧2 on Earth), and h is the height above the ground in meters.
Gravitational potential energy is defined as the energy an object possesses due to its position in a gravitational field.
According to symbolic interactionism, which stage of role taking involves individuals beginning to imagine and play the role of a significant other?
The correct stage of role taking according to symbolic interactionism is the play stage.
Symbolic interactionism is a sociological perspective that is influenced by the work of George Herbert Mead. According to Mead, the process of role taking involves several stages through which individuals develop their self-concept and learn to interact with others in society. The stages are as follows:
1. Preparatory Stage (Imitation): In this initial stage, children imitate the behaviors and actions of significant others without fully understanding the roles they are imitating.
2. Play Stage: This is the stage where individuals, often children, begin to imagine and play the role of a significant other. During the play stage, children take on the roles of people in their lives, such as parents, teachers, or other figures, and act out scenarios from their perspective. This imaginative play helps children to understand the roles and expectations of different social positions.
3. Game Stage: In the game stage, individuals start to internalize the generalized other, which represents the organized attitudes of a social group. Here, children learn to consider the expectations of a wider community and how their actions fit into larger social systems. They learn to play games with rules and understand that each role has its own set of expectations and behaviors that are dictated by social norms.
4. Generalized Other: Finally, individuals develop the ability to think from the perspective of the generalized other, which means they can consider the expectations of society as a whole when interacting with others. This stage is crucial for the development of a fully formed self-concept and the ability to engage in complex social interactions.
Thus, the play stage is where individuals begin to imagine and play the role of a significant other, which is essential for the development of empathy, social understanding, and the ability to take on various social roles throughout life.
A ship is traveling at 154 m/s and accelerates at a rate of 1.80 m/s^2 for 1 minute. What will its speed be after that minute? Calculate the answer in both meters per second and kilometers per hour.
Given:
u(initial velocity): 154 m/s
accelerates (a): 1.8 m/s^2
t= 1 min=60 secs
Now we know that
s= ut + 1/2(at^2)
s= 154 x 60 + (1.8 × 60 ×60) ÷ 2
s= 12,480 m
The air sealed between two panes of glass in some windows helps to _____.
reduce the flow of heat passing through the window
increase the flow of heat passing through the window
reduce the visible light passing through the window
increase the visible light passing through the window
The answer is: reduce the flow of heat passing through the window.
A double glazing window or insulating glass consists of two glass window panes separated by a spacer bar and seals to create a hermetically-sealed environment. Space between glass panes is filled under vacuum with either dehydrated air or an inert gas to improve insulation and prevent condensation within the unit. The physical properties of the dehydrated air used in the space between glass panes mean that it transmits less heat than normal air, this is because the molecules of dehydrated air are relatively inert and therefore have a lower thermal conductivity.
The air sealed between two panes of glass in some windows helps to reduce the flow of heat passing through the window. Even though the windows are more expensive to build, that little bit of trapped air in there is a very effective INSULATION. It makes the house easier to keep warm in Winter, and easier to keep cool on Summer, and both of those save on the cost of gas or electricity for the house.
when a ball is dropped off a cliff in free fall, it has an acceleration of 9.8 m/s^2. what is its acceleration as it gets closer to the ground
If the ball, the cliff, and the ground are all on the Earth, and everything is bathed in an ocean of air, then the ball's acceleration will decrease as it falls, because of the friction of air resistance. If it has far enough to fall, it's possible that its acceleration may even become zero, and the ball settle on a constant speed (called "terminal velocity") before it hits the ground.
But until we get to College-level Physics and Engineering, we ALWAYS ignore that stuff, and assume NO AIR RESISTANCE. The ball is in FREE FALL, and the ONLY force acting on it is the force of gravity. We also assume that the distance of the fall is small enough so that the value of gravity is constant over the entire fall.
Under those assumptions, there's nothing present to change the acceleration of the falling ball. It's 9.81 m/s² when it rolls off the edge of the cliff, and it's 9.81 m/s² when it hits the ground.
You have a small piece of iron at 75 °C and place it into a large container of water at 25 °C. Which of these best explains what will occur over time. A:The iron will cause the water to boil and turn to steam. B:The iron will take the heat from the water and get hotter. C:The water will cool significantly due to its colder temperature. D:Some heat from the iron will move to the water causing both to change temperatures.
D:Some heat from the iron will move to the water causing both to change temperatures.
Which best describes the movement of a fluid during convection?
A. Warm & cool fluids rise
B. Warm & fluids sink
C. Warm fluid rises & cool fluid sinks
D. Warm fluid sinks & cool fluid rises
During convection, Warm fluid rises & cool fluid sinks (C).
Answer is C- warm fluid rises and cool fluid sinks.
Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Convection process takes place through advection or diffusion.
Is 2Na + Cl --> 2 NaCl a balanced chemical equation? Is it obeying the law of conservation of matter?
No it is not balanced. It has more CI on the product side that the reactant side.
Hope I helped
What are base isolators and give an example of an earthquake proof building
Base isolation is a technique developed to prevent or minimise damage to buildings during an earthquake. It has been used in New Zealand, as well as in India, Japan, Italy and the USA.
Taipei 101
A toaster uses 400 W of power. How much energy does it use in 5 seconds? A. 2000 J B. 1000 J C. 80 J D. 400 J
A
Energy = Power × time
= 400 × 5 = 2000 J
In 5 seconds, the toaster uses 2000 joules (J). The Choice (A) 2000J is the best one.
Given:
Power of the toaster (P) = 400 W
Time (t) = 5 seconds
The quantity of work completed or the entire amount of power used over a specific time period is referred to as energy (E). In the International System of Units (SI), it is expressed in joules (J). The energy calculation formula is as follows:
For the energy used by the toaster in 5 seconds,
Energy (E) = Power (P) × Time (t)
E = 400× 5
E = 2000 joules (J)
Therefore, the toaster uses 2000 joules (J) of energy in 5 seconds. The correct answer is A. 2000 J.
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"Fifteen hundred years ago everybody knew the Earth was the center of the universe. Five hundred years ago, everybody knew the Earth was flat, and fifteen minutes ago, you knew that humans were alone on this planet. Imagine what you’ll know tomorrow.” That's a statement of Agent Kay in from Men in Black. Agent Kay's statement illustrates that theories are A) always true. B) constantly changing. C) describe what happens in the natural world. D) are proven by evidence collected by scientists.
Scientific theories are constantly changing for many reasons. Sometimes it IS because of new evidence. But we would not use the term proven because they ARE always changing! Therefore, the answer is B.
While teaching about transistors, Mr. Mendoza shows a video of a hand pump being used to draw water from a well. He points out how the person primes the pump by pouring a small amount of water into it before the water would start to flow. No matter how much water is used to prime the pump, once started, the pump provides a steady flow of water while the handle is operated.
What is Mr. Mendoza using the hand pump to model?
its use as a switch to make a small signal into a large signal
its use as an amplifier to make a small signal into a large signal
its use as a switch to turn on a large current using a small current
its use as an amplifier to turn on a large current using a small current
Mr. Mendoza is using the hand pump to model the transistor's use as a switch to turn on a large current using a small current.
If my teacher had used this model (around 1972) to illustrate the concept, I don't think I would have absorbed the idea. I was substantially clueless, and the model is pretty abstruse.
Mr. Mendoza using the hand pump to model to use it as a switch to turn on a large current using a small current. Hence option C is correct.
What is transistor ?The definition of the Transistor is in name itself, it is the transfer of resistance. it has three terminals collector, base and emitter. Emitter is highly immured which emits the charge charrier. Collector is moderately immured which collects charge carrier and Base which is lightly immured which biases the charge carrier. It is connected in common base, common emitter and common collector mode. Common emitter mode is widely used for amplification and switch purpose.
To use transistor as a switch emitter is grounded and collector is at positive potential. When voltage at the base exceed the cut off voltage(0.7 V for silicon), it drives the current from collector to emitter and whatever instrument is connected to it gets on.
In the picture of the hand pump, tap works as emitter, inlet of the handpump work as collector and handle of the pump work as base which drives the water. Motion in the handled of handpump produces flow of water from ground to tap. it is used as switch.
Hence option C is correct.
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A normal walking speed is around 2.0 m/s . how much time t does it take the box to reach this speed if it has the acceleration 5.54 m/s2 that you calculated above?
Given:
u(initial velocity)=0
a=5.54m/s^2
v(final velocity)=2 m/s
v=u +at
Where v is the final velocity.
u is the initial velocity
a is the acceleration.
t is the time
2=0+5.54t
t=2/5.54
t=0.36 sec
Using the formula for acceleration, we find that the time it would take the box to reach the speed of 2.0 m/s under an acceleration of 5.54 m/s^2 is approximately 0.36 seconds.
Explanation:To find out the time t it would take the box to reach the speed of 2.0 m/s under an acceleration of 5.54 m/s2, you would use the formula for acceleration, which is acceleration = change in speed / time. Solving this formula for time gives time = change in speed / acceleration.
Plugging the given values into this formula, we get time = 2.0 m/s / 5.54 m/s2. Calculating this gives a time of approximately 0.36 seconds.
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Which of the following is true about all of the outer planets?A.Much of the material in these planets is solid.B.The surface of these planets is rocky.C.They have many moons.D.They all rotate in the same direction.
A fugitive tries to hop on a freight train traveling at a constant speed of 5.5 m/s. Just as an empty box car passes him, the fugitive starts from rest and accelerates at a = 4.2 m/s2 to his maximum speed of 8.0 m/s.
(a) How long does it take him to catch up to the empty box car?
s
(b) What is the distance traveled to reach the box car?
m
Let the Fugitive catch the empty box after "t" s of time
So the distance moved by train in same time will be
[tex]d = 5.5*t[/tex]
Now in the same way distance moved by fugitive who is accelerating with a = 4.2 m/s^2 to his maximum speed v = 8 m/s
SO the time taken by him to reach maximum speed
[tex]vf = vi + at[/tex]
[tex]8 = 0 + 4.2*t[/tex]
[tex]t = 1.9 s[/tex]
distance moved by fugitive in t = 1.9 s
[tex]d = vi* t + \frac{1}{2}at^2[/tex]
[tex]d = 0 + \frac{1}{2}*4.2* 1.9^2[/tex]
[tex]d = 7.62 m[/tex]
So in 1.9 s the train will move more than 7.62 m so it will definitely catch the train after this
distance moved by fugitive in time "t" = distance moved by train in same time
Let say it will catch the train after t = 1.9 s so after that time it will move to his constant speed of 8 m/s
[tex]7.62 + 8 * (t - 1.9) = 5.5 * t[/tex]
[tex]8*t - 5.5*t = 8*1.9 - 7.62[/tex]
[tex]2.5*t = 7.58[/tex]
[tex]t = 3.03 s[/tex]
So it will take 3.03 s to catch the train
Part B)
Distance traveled by fugitive in same time
[tex]d = 7.62 + 8*(t - 1.9)[/tex]
here it is because the fugitive will accelerate to reach at his maximum speed of 8 m/s till 1.9 s and cover a total distance of 7.62 m and after that it will move at his maximum speed for rest of the time.
[tex]d = 7.62 + 8*(3.03 - 1.9)[/tex]
[tex]d = 16.67 m[/tex]
so it will move a distance of 16.67 m
compare the potential energy of water molecules as water changes from a solid to a liquid
The average kinetic energy of a substance is directly proportional to the temperature of that substance.
[tex]Mathematically\ Kinetic\ energy [K.E]\ \alpha\ T[/tex]
Here T is the temperature.
During the process of change of state,the temperature of the system remains constant as long one substance is not converted into another substance. It means that the energy absorbed or released at that time is utilised in changing the state of substance only. As kinetic energy is constant,so gain or loss of energy is attributed to potential energy.
In the given question,the water is converted from solid to liquid. During the melting of ice, heat is given to the ice for converting into liquid. The energy given is called latent heat which is nothing else than the gain of potential energy of water.
Hence water in liquid form has more potential energy than solid ice.
At the melting point, the solid form of water changes to liquid form. This happens at fixed temperature. During the phase change, the bonds between the molecules break and weakens. This reduces the binding potential energy. There is no change in the translational kinetic energy which is reflected by the temperature being constant during the phase change. The binding potential energy which reduces is actually utilized in breaking of the molecular bonds which eventually causes the phase change.
a person is strolling along a moving walkway at a constant velocity of +1.00 m/s with respect tot he walkway, which moves at a constant velocity of +0.50 m/s with respect to the ground. An observer on the ground is walking at a constant velocity of -0.2 m/s. what is the velocity of the person on the walk way with respect to the observers on the ground?
A - 0.7 m/s
B + 1.3 m/s
C - 0.3 m/s
D + 1.7 ms
Answer: D 1.7 m/s
In order to find the velocity of the person on the walk way with respect to the person on the ground we have to apply relative velocity concept.
Consider the observer on the ground as B and the person walking on the pathway as A.The relative velocity is the velocity that the body A would appear to an observer on the body B and vice versa.
Mathematically speaking the relative velocity is the vector difference between the velocities of two bodies.
Relative velocity = Velocity of Body A- Velocity of Body B.
Velocity of the person walking on the walkway (A)= 1.5 m/s.(given)
Velocity of the observer on the ground (B)= -0.2 m/s(given).
Relative velocity of object A with respect to B = 1.5 - (-0.2)= 1.7 m/s.
Thus the velocity of the person on the walk way with respect to the observers on the ground is 1.7 m/s.