Answer:
1.) Total distance = 70 m
2.) Total displacement = +30m
Explanation:
Distance is a scaler quantity. That is, we will be concerned about its magnitude only and not direction.
Total distance = 10 + 20 + 40 = 70 m
While displacement is a vector quantity. We will consider both the magnitude and its direction.
Forward direction will be positive while backward direction will be negative
Total displacement = +10 - 20 + 40
Total displacement = +30 m
Lasers can be used in
in place of a knife.
Answer: No
Explanation:
Laser can cut many things,
its cutting is so popular largely because of its versatility. Laser cutterscan cut a wide variety of materials – anything from paper, wood, cork, acrylic and foam to different types of metals. Still, there are some materials that would seemingly fit well into this list but should never be cut using a laser cutter.
What happens to a falling object when the force of air resistance equals the force of gravity?
A)It shows increasing acceleration.
B)It begins to slow down.
C)It reaches terminal velocity.
D) It shows projectile motion.
Answer:
Its C.
Explanation:
When the two forces of gravity and force resistance become the same, the object no longer speeds up , and it doesn't slow down either. This is called terminal velocity .
So ,C is the correct answer .
Hope it works out !!
When the force of air resistance equals the force of gravity, the falling object reaches terminal velocity. Hence, option (C) is correct.
What is terminal velocity?The maximum velocity attained by an object as it falls through a fluid is known as terminal velocity. It occurs when the sum of the drag and buoyancy forces acting on the object equals the downward force of gravity. Because the object's net force is zero, it has no acceleration.
An object is moving at its terminal velocity in fluid dynamics if its speed is constant due to the restraining force exerted by the fluid through which it is moving.
As an object's speed increases, so does the drag force acting on it, which is also affected by the substance it is passing through. The drag or force of resistance will equal the gravitational pull on the object at some speed.
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what is the resistance of a toaster that uses 2A when connected to a 120V power source?
Answer:
60 ohms
Explanation:
From Ohm's Law:
V = IR
Where V = 120volts
I = 2A
R = ?
Note that R,V and I represents resistance, voltage and current respectively.
Substituting the above values into the formula.
V = IR
120v = 2×R
120= 2R
Making R the subject
R =120/2
R = 60 ohms
Hence the resistance of the toaster will be 60 ohms.
A book with a mass of 3.3 kg sits on a bookshelf. If it has a gravitational
potential energy of 57 J, how high is the shelf? The acceleration of gravity is
9.8 m/s2
Given that,
Mass of the Book (M) = 3.3 Kg Gravitational Potential Energy (P) = 57 J Acceleration Due to Gravity (g) = 9.8 m/s²We have to find the height of the shelf
We know that,
[tex]\tt P = MgH [/tex]
Putting the values,
[tex] \sf \: 57 = 3.3 \times 9.8 \times h \\ \\ \implies \: \sf \: 57 = 32.34 \times h \\ \\ \implies \: \sf \: h = 1.76 \: m \: (approx)[/tex]
The height of the shelf is 1.76 mThe height of the shelf is 1.76 m
What is the meaning of mass in the church?
The definition of mass is the Liturgy of the Eucharist or a body of matter or a large number of people or things. An example of mass is a Roman Catholic church service. An example of mass is a pile of clay. An example of a mass is a gathering of thousands of people.
Given that,
Mass of the Book (M) = 3.3 Kg
Gravitational Potential Energy (P) = 57 J
Acceleration Due to Gravity (g) = 9.8 m/s²
We have to find the height of the shelf
We know that,
p = MgH
Putting the values,
57 = 3.3 × 9.8 × h
→ 57 = 33.34 × h
→ h = 1.76 approx
The height of the shelf is 1.76 m
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Commercials for a toy bouncy ball advertise that it will bounce to a height that is greater than the
height from which it was dropped. Why is this impossible?
Answer:
because energy will be lost due to friction, sound, and heat (arguably similar to friction) and ENERGY MUST STAY THE SAME so it is IMPOSSIBLE for the ball to bounce higher than when dropped!
Ernesto is an engineer who is trying to develop a lighter, stronger carbon wire. He looks to nanotechnology, because he wants a wire with high resistance so it can give off heat. Where is Ernesto’s error? Carbon wires are heavy. Carbon wires have low resistance. Carbon wires are weak. Carbon wires are not a form of nanotechnology.
Answer:
B. Carbon wires have low resistance.
Explanation:
Nanotechnology is a technology that deals with the study and applications of matter on a very minute scale, [tex]10^{-9}[/tex]. This technology has a lot of applications in various fields of study and has been used in the fabrication of carbon nanotubes.
Carbon nanotubes are ultra thin carbon wires which can be used majorly in electronics. This wire has remarkable properties (it behaves as a metal or semiconductor) that make it suitable for electronic applications.
Ernesto made an error by planning to use carbon wire to generate heat. Carbon nanotubes has a low resistance, thus low thermal dissipation.
Answer:
B
Explanation:
edge
Which of the following scenarios present an object with kinetic energy? Select all that apply.
A. a golf ball rolling across the green toward the cup
B. a flock of birds flying through the sky on their way to their winter living area
C. a book sitting on a shelf in the library
I think the right option are A and B
Those energy which is possessed by a body due to virtue of its motion is called kinetic energy.
Hope it helps...
Answer:
A. a golf ball rolling across the green toward the cup
B. a flock of birds flying through the sky on their way to their winter living area
Explanation:
Kinetic energy is the energy that an object has because of its motion. This energy can be converted into other kinds, such as gravitational or electric potential energy, which is the energy that an object has because of its position in a gravitational or electric field.
Please please please please PLEASE help!!!
Brainliest for whoever gets this right!
Describe how an earth wire and a fuse can protect an iPad with a metal casing
- 5 clear simple points
Answer:
Because the electricity flows through and creates static bonds around the metal case which creates a bond with other fields that protects it.
Explanation:
A fisherman noticed that a float makes 30 oscillations in 15 seconds. The distance between two consecutive crests is 2 m. What is the period and frequency of the wave? What is the wave speed?
Answer:
Period T = 0.5 s
Frequency F = 2 Hz
Wave speed V = 4 m/s
Explanation:
Given that the
Number of oscillations = 30
Time taken = 15 seconds
The distance between two consecutive crests is called wavelength
Wavelength = 2m
Period is the ratio of time and the number of oscillations
Period T = 15/30 = 0.5 seconds
Frequency F is the reciprocal of period. That is,
F = 1/T
F = 1/0.5 = 2Hz
Wave speed V is the product of frequency and wavelength
V = 2 × 2 = 4m/s
Answer:
Answer:
Period T = 0.5 s
Frequency F = 2 Hz
Wave speed V = 4 m/s
Explanation:
I just need a full answer here not only so I can answer the question, but also so that I can learn.
Locate the main groups of elements in each column on the periodic table, and identify the number of valence electrons there are in each element in a particular group. Infer why some elements are more reactive than others due to their number of valence electrons.
Answer: Number of valence electrons determine how fast or easy for an atom to gain stability. Either by gaining electrons or by losing electrons.
Group one and seven elements react fast because they only have one electron to gain or lose.
Explanation:
Number of valence electrons tell us the number of electrons an atom will gain or lose in order to attain stability in electron configuration.
All the elements in a particular group will have the same number of valence electrons as follows:
Group one - 1 valence electron
Group two - 2 valence electrons
Group three - 3 valence electrons
Group four - 4 valence electrons
Group five - 3 valence electrons
Group six - 2 valence electrons
Group seven - 1 valence electron
Group eight - 0 valence electron
Some elements are more reactive than the others because of the electron affinity, oxidation state and electronegativity of the atoms
For instance, elements in group 7 are more reactive than others because of their oxidation state and they have very high electronegativity.
Also, group one elements are more reactive because they only have one electron to loose.
Which piece of evidence from the article explains WHY the sun has a larger force of gravity
than the Earth?
(A)
Isaac Newton, an English scientist, discovered a law, or truth, about
gravity in the late 1600s.
(B)
The greater the mass of an object, the greater is its force of gravity.
(C)
Even a speck of dust has a force of gravity
(D)
The smaller the distance, the greater is the force of gravity between them.
Answer:
(B)
The greater the mass of an object, the greater is its force of gravity.
Material A has a higher thermal conductivity than Material B. Which material will transfer energy by conduction faster?
Answer: a
Explanation:
Which actions are evidence that a chemical reaction has occurred? Select five options. a change in color the formation of a precipitate a clear liquid becoming cloudy a change in shape the formation of bubbles the formation of smoke
Answer:
Explanation:
Answer:
b
Explanation:
Which statement is correct? (2 points)
Group of answer choices
(A) When a positively charged atom loses an electron to a positively charged atom, two neutral atoms are created.
(B) When a neutral atom loses an electron to another neutral atom, two charged atoms are created.
( C ) When a neutral atom loses an electron to a positively charged atom, both atoms become neutral.
(D) When charged atoms lose electrons they will become positively charged atoms.
Answer:
When a neutral atom looses an electron to another neutral atom, two charged atoms are created.
Explanation:
On the off chance that one of the two unbiased particle looses an electron, it turns out to be emphatically (charge: +1), in light of the fact that the electron conveys a charge of - 1. Thus, the other atom which acknowledges the electron turns out to be adversely charged (charge: - 1). And in the end, we will have two charged atoms.
Answer:
C
Explanation:
Remember This, energy cannot be created or destroyed only transfered
etc.
Please please please please PLEASE help!!!
Brainliest for whoever gets this right!
Describe how an earth wire and a fuse can protect an iPad with a metal casing
- 5 clear simple points
Answer: an earth wire and a fuse can protect an ipad with a metal casing because an earth wire is strong and a fuse is basically a force and if you put them together the work like really good
Explanation:
idk i was just guessing sorry
Select all that apply.
The following diagram shows the path of a planet around the Sun. Kepler discovered that _____.
A)area A = area B
B)the distance from P2 to P3 is half the distance from P5 to P6
C)the speed in the interval from P1 to P2 is twice the speed in the interval from P6 to P1
D)the speed in the interval from P1 to P2 is less than the speed in the interval from P3 to P4
Answer:
The right answer is area =Area C
Explanation:
We can solve the problem by using kepler's law of planetry motion.
Kepler discovered that area B = area C because of its similar distance of orbit from the sun.
What Kepler discovered?A certain planet sweeps out an area B from the point P3 to P4 in a time t while on the other hand, for the same interval of time t, the planet sweeps out an area C from point P4 to P5, that is equal to the previous area according to second Kepler's law.
So we can conclude that Kepler discovered that area B = area C because of its similar distance of orbit from the sun.
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Which sentences describe the cyclone device?
A cyclone device accumulates fine particulates from the air by making a dirty air stream flow in a spiral path inside a
cylindrical chamber. It consists of several long and narrow fabric filter bags suspended upside-down in a large
enclosure. When dirty alr enters the chamber, the larger particulates strike the chamber wall and fall into a conical dust
hopper at the bottom. Fans blow dirt-filled air upward from the bottom of the enclosure, trapping dirt particles inside the
filter bags and releasing clean air from the top. The top of the chamber has an outlet that lets out cleaned air.
Answer: Option A
Explanation:
A cyclone device is an instrument which measures the cyclone. In this case the device collects the particulates mixed in air which makes the air dirty.
It revolves inside the cylindrical chamber in a forming a spiral path. This is what a cyclone is.
In real, the cyclone is also the same but is so huge that it carries away the things coming in its path. These things can be homes, trees and other materials.
This is very destructive and cause loss of life and loss of assets.
Below image, please give me the answer quick.
Answer:
Option A. ⅓V
Explanation:
We'll begin by calculating the total resistance in the circuit. This is illustrated below:
R1 = 1Ω
R2 = 2Ω
R3 = 3Ω
RT =..?
Since all three resistor are in series connections, the total resistance can obtain as follow:
RT = R1 + R2 + R3
RT = 1 + 2 + 3
RT = 6Ω
Next we shall determine the current flowing through the circuit.
Voltage (V) = 2V
Resistor (R) = 6Ω
Current (I) =..?
V = IR
2 = I x 6
Divide both side by 6
I = 2/6
I = ⅓A
Finally, we can obtain the voltage across the 1Ω resistor as follow:
Resistor (R) = 1Ω
Current (I) = ⅓A
Voltage (V) =?
V = IR
V = ⅓ × 1
V = ⅓V
Therefore, the potential difference across the 1Ω resistor is ⅓V
What is the path that an electric current follows called
Monochromatic light is incident on two slits separated by 0,2 mm. An interference pattern is observed on a screen 3,7 m away. The distance between the 3rd dark fringe and the central antinode is 0,048 What is the wavelength of the light? Write your answer in sicentific notation or in decimal form
Answer:
λ = 864 nm
Explanation:
To find the wavelength of the light you use the following formula, which determines the position of the m-th fringe in an interference pattern:
[tex]y_m=\frac{m\lambda D}{d}[/tex] (1)
ym: position of a bright fringe
D: distance from the slits to the screen = 3,7 m
d: distance between slits = 0,2mm = 0,2 *10^-3 m
m: order of the fringe
λ: wavelength of the light
You have the distance from the central peak to the third fringe (0,048m). Then, you can use the equation (1) with m=3 and solve for the wavelength:
[tex]y_3=\frac{3\lambda D}{d}\\\\\lambda=\frac{dy_3}{3D}=\frac{(0,2*10^{-3}m)(0,048m)}{3(3,7m)}=8,64*10^{-7}m\\\\\lambda=864*10^{-9}m=864nm[/tex]
henc, the wavelength of the light is 864nm
What energy transformation takes place in a fire?
radiant energy to thermal energy
thermal energy to nuclear energy
chemical energy to thermal energy
Answer:
Chemical Energy To Thermal Energy
Explanation:
Fire is a chemical reaction. So, because of chemical reactions, the temperature raises to ignition temperature and results as fire. And then it releases photons(that generates heat after being hit by any other matter)
Answer:
Coal is burned at a power plant. The chemical energy released as the coal is burned heats water and turns it into steam.
Explanation:
If that makes since!
A bird is flying with through the air with a speed of 18.0 m/s. As it flies, it holds in its claws a 2 kg fish that it
just caught moments ago. Suddenly, the fish wiggles a bit the bird loses its grip, and the fish falls 5.4 m, landing
in the lake below. What speed does the fish have right before safely splashing back into the lake?
Which of the following observations demonstrates the differences between speed of light and speed of sound? (Note, they are all true, but which one
represents the difference in the speed?))
A. In space you can see an explosion, but are unable to hear it.
B. A light bulb "pops" when it bums out.
C. You see lightning and then hear the thunder.
D. You are able to hear a sound coming from the apartment next to you, but you cannot see a light coming from a lamp in the apartment
Answer:
Definitely C.
select all that apply so it’s not just one answer. please and thanks :))
HI! I NEED HELP ASAP!!
Why are electromagnets used in metal scrap yards?
A.They are temporary magnets, so they can be turned on and off.
B. They are very powerful permanent magnets.
C. They are weak permanent magnets.
D. They are temporary magnets, so eventually the metal just falls off.
Answer:
The answer is A. They are temporary magnets, so they can be turned on or off.
Explanation:
An Electromagnet consist of a soft ion core in a current carrying solenoid that is wound in opposite direction round the two arms of a bar.
They are temporary magnets and they loose their magnetic property the moment they are turned off.
Answer:
A. They are temporary magnets, so they can be turned on or off.
Explanation:
A ____ is another name for a group of elements with similar properties
on the periodic table of elements.
Answer:
Family
Explanation:
The groups of elements are called families
Whenever energy changes form, people sometimes say that some energy is "lost." What is meant by this?
A. The energy is not truly lost; it transforms into forms that are not easily put to use.
B. The process of changing form reduces the total amount of energy in the universe.
C. Whenever energy changes form in one location, a corresponding change in the opposite direction must take place somewhere else.
D. Sometimes a "mistake" or an inefficiency in the transformation causes energy to be destroyed.
Answer:
A. The energy is not truly lost: it transforms into forms that are not easily put to use.
Explanation:
This is due to the fact that when we use energy, it seems to have disappear, but it really hasn't. In fact, when we use energy, it is changing into another form that has to be converted in order for energy to be present once again.
Answer:
A
Explanation:
Find the velocity of a wave of period 2 s and wavelength 0.5m. *
Answer:
The velocity of wave is 0.25m/s
Explanation:
First, you have to find the fequency using the formula, F = 1/Time :
[tex]f = \frac{1}{t} [/tex]
Let t = 2s,
[tex]f = \frac{1}{2} [/tex]
[tex]f = 0.5Hz[/tex]
Next, you have to use speed formula, V = f×λ :
Let f = 0.5Hz,
Let λ = 0.5m,
[tex]v = 0.5 \times 0.5[/tex]
[tex]v = 0.25[/tex]
All incident and reflected rays obey which law?
Answer:
law of reflection
Explanation:
which types of materials have a molecular structure that makes them good conductors explain how understanding this relationship can help people design more efficient technologies
Answer: Metals
Explanation:
The metals are the conductors of electricity. These are made up of atoms which conducts electricity in the form of electrons in the outer shell that can move freely. These take away the electric charge on the entire metallic system. This way the metal conducts electricity and can also pass electricity to other surfaces if come in their contact. Thus the metals are used for creating equipment of technological importance.
Answer:
Metals
Explanation: