A constant force of 1.25N
Explanation:
This is a kinematics problem.
First find acceleration,
then use F = ma to find force.
Given:
mass = .5kg
delta x = 20m
t = 4s
a = ?
Friction = 0
From the kinematics equations:
delta x = Vi + (1/2)at^2
Plug in terms that are given:
20m = 0 + (1/2)a(4^2)
(2*20m)/(16s^2) = a
40m/(16s^2)= 2.5m/s^2
Now use F = ma to find force exerted on object.
F = (0.5kg)*(2.5m/s^2)
F = 1.25N
A student is creating a model of a concave lens. The diagram shows her incomplete model.
Which action would best complete her model?
A
The student should draw the light moving into the lens and then exiting in converging lines.
B
The student should draw the rays of light moving into the lens and then exiting at right angles.
C
The student should draw the rays of light moving into the lens and then exiting in a straight path.
D
The student should draw the light moving into the lens and then exiting in lines that are spreading out.
Answer:
D
Explanation:
I’m pretty sure it’s correct but I don’t really know. Just trying to pass science
Answer:
The correct answer is D trust me I did the test
When the concave lens moves in it exit by spreading out like water
The linear expansivity of metal P is twice that of another metal Q. When these materials are heated through the same temperature change, their increase in length is the same. Calculate the ratio of the original length of P to Q
What's Inertia ????☁️☁️
Explanation:
the inability to change the position from rest to motion or motion to rest by themselves is inertia.
Answer:
Inertia is the property of a body in rest to resist motion or a body in motion to continue to its state of motion unless acted by external forces.
what is the average of this set of data 5, 18, 8, 4, 10
answer:
9
Explanation:
add them all together then divide
A small pebble and one large boulder start at the same height and begin rolling down the side of a mountain. Which object would have less kinetic energy as it crashes on the road at the bottom of the mountain? Justify your selection.
Answer:
The small pebble
Explanation:
Since the potential energy, P.E lost equals kinetic energy, K.E gained,
P.E = K.E
P.E = mgh = K.E
So, K.E = mgh where g = acceleration due to gravity and h = height of drop
Since h and g are constant
K.E ∝ m
So, the kinetic energy of the object is directly proportional to its mass. Thus, the object with the smaller mass has the lesser kinetic energy.
Since the object with the smaller mass is the small pebble, so the small pebble would have less kinetic energy as it crashes on the road at the bottom of the mountain.
What is the law of inertia? Give an example of inertia in action.
Answer:
The law of inertia is another name for Newton's first law. Newton's first law states that an object will not change its motion or direction unless a force acts on it. An object at rest will stay at rest and an object in motion will stay in motion if there isn't any force acting on them.
Example: When a car uses its brakes to stop, you sometimes feel like you are sliding forward. That is because the inertia keeps you moving forward, even though the car stopped.
Explanation:
Answer:
Law of inertia is sometimes called Newtons First law of motion.
Newtons first law of motion states that"A body will continue to its state of rest or motion unless external force acted upon it.
PLEASEHELP THANK YOU SM
Answer:
I belive it would be the first answer choice.
Explanation:
When the Mass is lower, the ball moves faster so it would have more kintetic energy
Which household item uses radiation in a beneficial way? conventional ovens smoke detectors electric air filters computers and TV sets
Answer:
Smoke detectors
Explanation:
This is because the ionization chamber in smoke detectors uses radiation, a form of heat transfer to detect smoke.
.The NRC allows beneficial use of smoke detectors which is a radioactive material because a smoke detector has the ability to save lives . it's ability to save lives outweighs any health risk from the radiation. The smoke detector use a very minimal amounts of radioactive materials.
Answer: The household item which uses radiation in a beneficial way is the SMOKE DETECTORS
Explanation:
Radiation is a type of energy that has the ability to travel through space and penetrate materials. There are various types of radiation which include alpha, beta and gamma rays. Many uses of radiation help to ensure high quality and safety of our daily lives. A typical example is seen in smoke detectors.
Smoke detectors are devices installed in a building which serves the purpose of detecting smoke which usually is associated with fire and sounding off an alarm. The types of smoke detectors available depends on their mode of action and these include:
--> Ionization smoke detectors: These type of detector are generally more sensitive to flamming fires. They have an in built small amount of RADIOACTIVE material between two electrically charged plates, which ionizes the air and causes current to flow between the plates. When smoke enters the chamber, it disrupts the flow of ions, thus reducing the flow of current and activating the alarm. An isotope of americium which emits alpha particles is used in this type of smoke detectors and it's an example of an alpha radiation.
Therefore, the household item which uses radiation in a beneficial way is the SMOKE DETECTORS.
If a 96 n force of gravity is happening to a falling basketball what is the ball mass? The accelydue to gravity is 9.8m/s^2
Answer:
9.80 kg
Explanation:
F = ma
96 N = m(9.8 m/s^2)
m = 9.80 kg
The mass of the ball will be m= 9.8 kg
What is Newton's second law of motion?
It states that the force is equal to the rate of change of momentum . For a constant mass , force is equal to mass times acceleration
given :
Force due to gravity = 96 N
g = acceleration due to gravity = 9.8 m /s^2
using Newton's second law of motion
Since , F = ma
96 = m g
m = 96/9.8
m= 9.8 kg
The mass of the ball will be m= 9.8 kg
learn more about Newton's second law of motion:
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When we touch a Van de Graaff generator, our hair may stand up if it is dry. This happens only if the strands of our hair do what?
Answer:
Repel each other.
Explanation:
Van de Graaff generator is a device that was invented in 1929, by an American physicist called Robert J. Van de Graaff.
A Van de Graaff generator refers to an electrostatic generator that typically involves the use of a moving belt to accumulate electric charge on a hollow globe that is made from metal placed on top of an insulated column and thereby, creating very high electric potentials i.e very high voltage-direct current (DC) electricity at low current levels.
Generally, when we touch a Van de Graaff generator, our hair may stand up if it is dry. This happens only if the strands of our hair repel each other because they are like charges i.e having the same potentials.
Two swimmers competed in a race. The graph shows how the position of both swimmers
changed over time during the race.
Two swimmers competed in a race. The graph shows how the position of both swimmers
At what rate of speed did Swimmer 1 travel throughout the race?
Answer:
2m/s
Explanation:
Calculate the slope at any point as the line is linear. i.e. 20/10 = 2/1 m/s
When an object is moving to the left and slowing down, what direction is the acceleration?
Answer:
According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up.
Explanation:
1.A motorcycle’s velocity at the top of the hill is 11.0 m/s. 4.0 seconds later it reaches the bottom of the hill with a velocity of 20.0 m/s. What is the acceleration of the motorcycle?
2.A motorcycle’s velocity at the top of the hill is 11.0 m/s. 4.0 seconds later it reaches the bottom of the hill with a velocity of 20.0 m/s. What is the acceleration of the motorcycle?
Answer:
1) as far as I remember
Let's take 20 as vf (final velocity) and 11 as (initial velocity) and 4 as time
So we would use this formula a=vf-vi/t
So 20-11/4
Asnwer 2.25
A student has two identical sheets of paper. He crumples one up into a small ball. If he drops the sheet of paper and the ball of paper off a building at the same time, which of the following statements describes the result?
A. The sheet of paper because it is more affected by gravity.
B. The ball of paper hits the ground first because it is more affected by gravity
C. The sheet of paper and the ball of paper hit the ground at the same time.
D. The ball of paper hits the ground first because it has less surface area.
Answer:
B
Explanation:
basically, because the ball "weighs" more now, it will hit the ground quicker. so technically gravity is more affective towards it. the piece of paper kind of floats it's way down. gravity isn't pushing on one force more, but because because the ball weighs more, it technically would be said so. hope this helps!
Answer:
the ball of paper, because it has less surface area.
Explanation:
Two air craft P and Q are flying at the same speed 300m/s. The direction along which P is flying is at right angles to the direction along which Q is flying. Find the magnitude of velocity of the air craft P relative to air craft Q
Answer:
424.26 m/s
Explanation:
Given that Two air craft P and Q are flying at the same speed 300m/s. The direction along which P is flying is at right angles to the direction along which Q is flying. Find the magnitude of velocity of the air craft P relative to air craft Q
The relative speed will be calculated by using pythagorean theorem
Relative speed = sqrt(300^2 + 300^2)
Relative speed = sqrt( 180000 )
Relative speed = 424.26 m/s
Therefore, the magnitude of velocity of the air craft P relative to air craft Q is 424.26 m/s
Help please hurry! ‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️
Which statement is true about the thermal energy of an object? Choose the correct answer.
1. Thermal energy is the internal potential energy of an object.
2.Thermal energy is the heat that is transferred in and out of an object.
3. Thermal energy is the sum of kinetic and potential energy of an object.
4. Thermal energy is the internal kinetic energy of the molecules of an object.
Answer:
the answer is number 2
Explanation:
did this earlier this year
How are amplitude, intensity, and
loudness related?
Answer:
Amplitude is a measure of the size of sound waves. It depends on the amount of energy that started the waves. Greater amplitude waves have more energy and greater intensity, so they sound louder. The same amount of energy is spread over a greater area, so the intensity and loudness of the sound is less.
Explanation:
10. Which of the following is an electrical insulator?
A. a penny
B. a bike chain
C. a tree
D. a gold tooth
Answer:
c
Explanation:
every other option is a conductor
Human resource professionals are reviewing the needs of a company that is
building a new factory. The company needs people who can weld electronic
elements together, test them, and package them securely. The HR
professionals conclude that four kinds of workers could complete this
process. Their work is the HR function of
A. employee retention
B. recruitment
C. selection
D. job design
Four satellites are in orbit around the Earth. The heights of their four orbits
are identical. The masses of the four satellites are given in the table. For
which satellite is the gravitational pull of Earth the strongest?
A. Satellite A
B. Satellite B
C. Satellite C
D. Satellite D
The gravitational pull of Earth is stronger in satellite A
How is a circuit formed
Answer:
An electrical circuit is composed of a source of electrical power, two wires that can carry electric current, and a light bulb. One end of both the wires is attached to the terminal of a cell while their free ends are connected to the light bulb. The electrical circuit is broken when the bulb is switched off.
Standing and holding a barbell that has a mass of 100kg at a height of 2m involves being done on the barbell to maintain
the position.
Answer:
1960Joules
Explanation:
Since we are not told what too find, we can as well find the Gravitational Potential Energy.
GPE = mass * acceleration due to gravity * height
GPE = 100*9.8 * 2
GPE = 980*2
GPE = 1960Joules
Hence the gravitational potential Energy is 1960Joules
An object is lifted against gravity from the floor to a tabletop. This is an example of
Answer:
Work done against gravity in lifting an object becomes potential energy of the object-Earth system. The change in gravitational potential energy, ΔPEg, is ΔPEg = mgh, with h being the increase in height and g the acceleration due to gravity.
Explanation:
This girl named Emma she my crush what do I say to her.
Answer:
you gotta shoot your shot.
Explanation:
look for the signs. ask her out before someone else does. you got this dawg
answer this plsss
The range of human hearing is 20 Hz – 20 000 Hz.
Calculate the longest and shortest wavelengths we can hear.
Explanation:
the velocity of sound in air is 330m/s
and v=fh, where h is wavelength f is frequency,
h=v/f.......(1)
longer wavelength
h=330/20,h=16.5m
shorter wavelength
h=330/20000,h=1.65x10-²m
The lesser frequency was used for finding the longer wavelength since wavelength is inversely proportional to frequency,
thus an increase in frequency brings a decrease in wavelength.
and shorter wavelengths are more high and intense
hope this helps
Which of the following statements about Australian football is TRUE?
A.
The players tend to wear a large amount of padding.
B.
Goals are scored by kicking the ball through goalposts.
C.
Each team has a number of set plays for both offense and defense.
D.
The constant movement of the ball is similar to baseball.
Answer:
B.
Goals are scored by kicking the ball through goalposts.
Explanation:
What is the energy conversion in an incandescent lightbulb?
Answer:
An incandescent bulb use electrical energy
Explanation:
When naming the compound containing lithium and chlorine, change the
suffix of the anion's name to
O A. ide
B. ite
C. cation
D. anion
Ape_x
Answer: Ide
Explanation:
Just got it right on the quiz
Answer:Ide
Explanation: thats the answer for a pex
What is the nergy of a wave that has a
frequency of 6.32 x 10^20 Hz?
here you go thank bob not me he will be very thankful