Answer:
A hypothesis predicts the value of a dependent variable given an independent variable:
If a person weighs 50 kg (independent variable) the weight hypothesis predicts that W = 50 * 9.8 = 490 N (the dependent variable)
So those three should be present in an investigation
Xander drew a diagram of a candle and its reflection in a mirror as shown below.
A candle sits to the right of a concave mirror. A black line from the base of the candle to the mirror has a point between the mirror and the candle with a dot labeled Focal Point. A purple arrow runs straight from the tip of the candle flame, reflects off the mirror and continues down and left through the focal point. A green arrow runs down and left to the lower part of the mirror through the focal point, reflects off the mirror and runs left parallel with and below the black line. A small image of the mirror with its base on the black line and the tip of the flame below the black line sits to the left of the focal point and to the right of the candle itself.
How should Xander describe the reflection?
A. The reflection of the candle in the concave mirror formed an upside-down real image that is smaller than the candle.
B. The reflection of the candle in the convex mirror formed an upside-down real image that is smaller than the candle.
C. The reflection of the candle in the concave mirror formed an upside-down virtual image that is smaller than the candle.
D. The reflection of the candle in the convex mirror formed an upside-down virtual image that is smaller than the candle.
The nature of the image depends on the position of the object which is the candle in this case.
What is a concave mirror?A concave mirror is one of the types o curved mirror. We must note that the position and nature of the image is determined by the position of the object as shown on the ray diagram.
In this case the ray diagram is missing hence the question is incomplete. The nature of the image depends on the position of the object which is the candle in this case.
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Answer:
A
Explanation: Its the right answer on edge
What does newton’s second law describe ?
A. the tendency of moving objects to stay in motion
B. Action-reaction pairs
C.The attractive force between two objects due to their masses
B. How the amount of mass influences the amount of force needed to move an object
states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.
In the diagram below, each arrow represents a force of equal magnitude. What type of acceleration does the box have?
nvm I'm tired
The box moves to the left side due to application of more force.
Direction of box movementThe box moves to the left direction because double force is applied on it whereas small force is applied from the left side. If the same amount of force is applied from both sides then the box will not move but due to unequal force, the box will move in the direction in which more force is applied.
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physics behind cricket bat
Cricket bat uses one common law of physics
The law of conservation of linear momentumWhen a ball hits the bat with some velocity ,the cricket bat should hit with some more velocity to get greater impact velocity to move the ball somewhere .
Calculate the amount of conventional current flowing in the wire. The measurement was made at a location where the horizontal component of the earth's magnetic field is bearth 2 ✕ 10-5 tesla.
It can be deduced that the amount of conventional current that is flowing in the wire is 0.1608 A.
What is a conventional current?
The conventional current simply means the charge per unit time that is transported in a certain direction.
In this case, the magnetic field B of the wire makes an angle θ with the earth's magnetic field BEarth. From the tangent law of magnetism,
B = BEarth × tanθ
= (2 × 10 - 5T) × tan15 = 5.36 × 10-6 T
The current flowing through the wire will be:
I = 2πrB / μ0
I = 2π × (6 × 10-3m)(5.36 × 10-6 T) / (4π × 10 - 7)
I = 0.1608 A
Therefore, the amount of conventional current that is flowing in the wire is 0.1608 A.
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help?? ....... ┐(‘～`;)┌
Answer:
(3) Both extensional as well as compressional strain is produced
Explanation:
Both extensional as well as compressional strain is produced
Strain is amount of restoration formed by a restoring force .It is formed in the direction of force applied.If a force of 50 newton's was applied to an object with a mass of 500 grams, what will the object's acceleration be? (hint - units!).
Answer:
100 m/s²
Explanation:
50 N / 500 g = 50 N / 0.500 kg = 100 m/s²
Which shows the pieces after the magnet is cut?
N
S
N
S
ON
S
S
N
N
S
S
N
Save and Exit
Nexi
Submit
Mark this and return
Answer:
NS/NS
Explanation:
If we cut a bar of magnet in half pieces according to the question given below, then the magnet will show NS/NS that is the north-south because the smaller pieces of the magnet will become a small magnet with the same property -carrying both the poles , north pole as well as south pole.The poles will not be separated.
1 point
9. A 70 kg diver drops from a board 10 m above the water's surface.
Neglect air resistance. What is the diver's Kinetic Energy just before he hits
the water? Show work. NO work shown, NO credit. *
10.0 m
KE;= 0
PE;= mgyi
5.00 m
m
KE, = mv
PE, = 0
0
Your answer
The kinetic energy of the diver just before he hits the ground is 6860 J.
Kinetic energy can be defined as the energy of a body due to its motion.
Note: Just before the diver hits the ground, the potential energy is converted into kinetic energy.
Formula:P.E(Potential energy) = K.E(Kinetic energy)K.E = mgh..................... Equation 1Where:
m = mass of the diverh = height of the boardg = acceleration due to gravity.From the question,
Given:
m = 70 kgh = 10 mg = acceleration due to gravity.Substitute these values into equation 1
K.E = 70×10×9.8K.E = 6860 JHence, The kinetic energy of the diver just before he hits the ground is 6860 J.
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A 5 kg object has a kinetic energy of 250 J. The speed of the object is rearrange the formula KE=v^ ^ 2^ * m/2 to solve for v
[tex] \qquad\leadsto\sf{10ms^{-1}}[/tex]
Correct Question :A 5kg object has a kinetic energy of 250J. Find the speed of the object by rearranging the formula :[tex]\sf{ KE=v^2\dfrac{m}{2}}[/tex]
Solution:Kinetic energy of an object is the energy possessed by the virtue of its motion.
Kinetic energy is given by:
[tex] \quad\hookrightarrow\quad{\pmb{ \sf {KE=\dfrac{mv^2}{2} }}}[/tex]
Here, we are given that:
Mass of body is 5kgIt's kinetic energy is 250 JBy using the given formula:
[tex] \implies\quad \sf{ KE =\dfrac{mv^2}{2}}[/tex]
[tex] \implies\quad \sf{ 250 = \dfrac{5\times v^2}{2}}[/tex]
[tex] \implies\quad \sf{\dfrac{ 5}{2}\times v^2 = 250}[/tex]
[tex] \implies\quad \sf{ v^2 =250\times \dfrac{2}{5}}[/tex]
[tex] \implies\quad \sf{v^2 =\cancel{ \dfrac{500}{5}} }[/tex]
[tex] \implies\quad \sf{v^2 = 100 }[/tex]
[tex] \implies\quad \sf{ v =\sqrt{100}}[/tex]
[tex] \implies\quad \sf{v =\sqrt{10\times 10} }[/tex]
[tex] \implies\quad\underline{\underline{\pmb{ \sf{ v = 10\:ms^{-1}}}}}[/tex]
Someone, please help!! cant understand
Answer:
4400 N
Explanation: (c)
P= [tex]\frac{F}{A}[/tex]
F= PA
P= pressure
A= area
P=800x[tex]10^{3\\[/tex] and A= 5.5 x [tex]10^{-3}[/tex][tex]m^{2}[/tex]
Force F= 800x[tex]10^{3}[/tex]x0.0055= 4400 N
force exerted by the gas on the piston is 4400 N
If lightning jumps from the ground to a cloud, and the charge of the ground is positive, what is the charge of the cloud (Positive or Negative)? Why
Answer:
NEGATIVE
Explanation:
It is Negative beacause POSITIVE and NEGATIVE attract. It's just like a magnet... I think you have tried that if you put the south pole of a magnet close to another south pole of another magnet, then it REPELS right? That's because they don't attract, but if you put south and north together, then they WILL attract to each other.
Same with Positive and Negative Electrons
If the ground is Positive, and the lightning gets attracted to the cloud, that means that the cloud is NEGATIVE
Glossary: (italic words)
Repel - going away from each other
attract - coming even closer to each other
Thanks!
Electrons that have accumulated in one spot and discharged themselves create lightning. A lightning strike has a very negative source.
What is lightening?A cloud-based electrical discharge known as lightning can be seen. When there is an imbalance in the charges between one area of the cloud and another surface, this occurs.
The earth has a positive charge compared to the cloud when lightning from the cloud strikes the earth.
Electrons from the cloud are released into the ground. The air becomes extremely hot and enters a highly conductive plasma state during the discharge.
Leaders might have also formed in other portions of the same cloud where there are electron-depleted patches with a positive charge.
The earth, which has recently had a significant influx of electrons and has become negatively charged, is channeled by the plasma from the original strike.
Thus, the cloud will be negatively charged.
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You observe a star system for many weeks. The light curve does not show significant changes in brightness, but a series of spectra show a spectral feature that cyclically appears as one absorption line, then two, then one again, and so on. Is this a binary system
Based on the changes in the light curve and the behavior of the series of spectra, this is a binary system.
How is this is binary system?The characteristics described are those of a binary system with the specific type of system being the spectroscopic binary system.
This is because in a spectroscopic binary system, there won't be significant changes in brightness but as a result of stars orbiting towards and then away from us, spectral features will appear as alternative absorption lines.
In conclusion, this is a binary system.
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An object hits the ground travelling at 8 km/hr. It is brought to rest in 0.4 seconds. What is its
acceleration in m/s^2?
Explanation:
8km/hr---→2.22m/s
a=v-u/t
0-2.22/0.4
5.55m/s²
E-mail is usually a poor choice for the distribution of sensitive electronic files because __________. A. Paper copies seem more official than e-mail B. Not all computers can read e-mails correctly C. It is easy to send e-mail to the wrong person D. E-mail is saved on the server that transfers it Please select the best answer from the choices provided A B C D.
Answer: D.) e-mail is saved on the server that transfers it
Explanation:
D. E-mail is saved on the server that transfers it is the right answer
What is an email?Email (Email) is a computerized application for exchanging messages between users. The global email network enables rapid exchange of email messages. Email is an electronic version of a letter, but it has advantages in terms of topicality and flexibility.
All emails in all inboxes around the world are stored on the server. An incredible amount of data requires a huge server farm. This is a huge center with millions of computers that store and send information.
A mail server (or email server) is a computer system that sends and receives emails. Web and mail servers are often integrated on a single machine.
E-mail is usually a poor choice for the distribution of sensitive electronic files because E-mail is saved on the server that transfers it
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Explain why in both partsthe leaf of the electroscope goes back to itsoriginal positionafter the rod is removed. Refer to rubric element b9 for guidance.
Answer:
The leaves of an electroscope will return to their original position if the electroscope is not grounded because the final condition of the electroscope is the same as it was originally.
If however if one touches the terminal of an electroscope while the scope is exposed to a source of static electricity, and then the contact with the terminal is removed before the source of static electricity is taken away, then any excess electrons will remain on the electroscope and the leaves will remain diverged.
Which of the following statements is incorrect about the relationship between force,
acceleration, and mass?
a. A small force results in a larger acceleration.
b. An object with greater mass will have smaller acceleration.
c. More force is needed to accelerate an object with a larger mass.
d. A small force results
a small acceleration.
Answer:
A
Explanation:
a small force results in a large acceleration
Which of the following has kinetic energy?
O a compressed spring
O a stretched spring
O a spring traveling down a flight of stairs
O a spring still at the top of a flight of stairs
It would be 3: a spring descending a set of steps. As kinetic energy is the energy of motion, it must be in motion.
What is Kinetic energy?Since it is moving, it would be a spring moving down a set of steps. A stretched spring, a compressed spring, and a spring at the top of a set of steps are all in motion.
Kinetic energy is a type of power that a moving object or particle possesses.
An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. A moving object or particle has kinetic energy, which depends on both its mass and its rate of motion.
Therefore, It would be 3: a spring descending a set of steps. As kinetic energy is the energy of motion, it must be in motion.
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The largest source of background radiation is
The largest source of background radiation is radon
which of the following is a vector quantity?
A) The power of a battery.
B) The density of an apple.
C) The volume of a mountain.
D) The weight of an elephant.
which of the following is a vector quantity?
D) The weight of an elephantWeight is the only quantity that is vector among the others. Power, density, volume all are scalar quantities.
Power:- It is a scalar quantity. It doesn't need a direction to specify it.The reason for others to be a scalar quantity is also same!Weight is a scalar quantity because it has a direction. Weight is the force applied by earth on an object. Now, the force must have a direction so it is a vector quantity!!~
Answer:
D) The weight of an elephant
Explanation:
Weight, acceleration, and velocity are all considered vector quantities because gravitational forces of the Earth are required to push them in certain directions. Always remember:
[tex]\displaystyle Vector \hookrightarrow Speed\:AND\:Direction \\ Scalar \hookrightarrow Speed[/tex]
I am joyous to assist you at any time.
Diamonds are a very dense material. Predict what would happen to the light ray if you projected it from air through a diamond
Answer:
It [the diamond] would act like a prism, and make a rainbow, or, the light would break up and disappear
Explanation:
that's what I would think at least
Answer:
a cat could eat it
Explanation:
Fluffy ate my diamond
A 985 car is moving in a circular track with tangential speed of 25 m/s . The radius of the track is 2.75km 985 kg,calculate the centripetal acceleration on the car
F = mv²/r = m.a
a = v²/r
a = 25²/(2.75 x 10³)
a = 0.227 m/s²
example of what happens to particles when their kinetic energy decreases?
Explanation:
When we decrease the temperature, less heat energy is supplied to the atoms, and so their average kinetic energy decreases. When they enter a phase transition, such as freezing from a liquid to a solid, the temperature is not decreasing or increasing, and stays constantAnswer:
when the kinetic energy of a particle decreases, according to me that body must have been freeze, like water particles or intermolecular force which losses when heated (gains more kinetic energy) and when freeze losses kinetic energy.
How does forces affect the acceleration of a body
The Earth rotates 1 time every 24 hours….
A. How many RPM’s is this?
B. What is the velocity of a person standing on the surface of the Earth 6,378,000 m from the center?
Answer:
A. 0.000694 RPM
B. 463 m/s
Explanation:
Post WWII Germany was divided into four zones with the Americans occupying one zone and all of the following countries occupying a zone EXCEPT:
a. USSR
c. France
b. Italy
d. England
Answer:
b. Italy
Explanation:
Italy had sided with germany and lost in world war 2
After the Potsdam conference, Germany was divided into four occupied zones: Great Britain in the northwest, France in the southwest, the United States in the south and the Soviet Union in the east.
europeuncedu
Element tounlukely have a reaction with any element or conpound
Answer:
conpound
Explanation:
calculates the speed of the satellite which performs orbital motion around the earth from an altitude of 3600km?
Answer:
Using the equation for orbital speed
orbital speed= square root of GM/r
Where
G= Gravitational Constant = 6.674x10^-11m^3/kg.s^2
M= mass of The Earth=5.972x10^24 kg
r= the combined radius of The Earth and the height of the satellite above The Earth=6378km+ 3600km= 9978km converting to meters gives (1000m=1km) 9978km*1000m/1km= 9,978,000m or 9.978x10^6m
orbital speed = square root of (6.674x10^-11*5.972x10^24/9.978x10^6= 63198m/s
Which nuclear reaction occurs in stars?
Answer:
In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom. Most commonly, in the core of a star, two hydrogen atoms fuse to become a helium atom.
22. True or False... The original unstable isotope is the daughter isotope.
Answer:
false
Explanation:
