Answer:
resultant vector
the answer is the resultant vector
The sum of two vectors D. resultant vector
What is a vector ?
A vector is an object that has both a magnitude and a direction
a) Vector addition is the operation of adding two or more vectors together using laws (such as triangle or parallelogram law ) , hence wrong option
b) Displacement is a vector whose length is the shortest distance from the initial to the final position , hence wrong option
c) Distance is not a vector quantity it is a scaler quantity , wrong option
d) The resultant is the vector sum of two or more vectors. It is the result of adding two or more vectors together, hence it is a correct option
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17. In which layer does mantle convection occur?
rms &
sources
LOGRAMS
A. Lithosphere
B. Inner core
C. Crust
• D. Asthenosphere
Answer:
D. Asthenosphere
Explanation:
The asthenosphere is relatively plastic part of the mantle which underlies the brittle lithosphere. In the asthenosphere, it is generally believed that the rocks are in ductile state and easily moves. It is the site of convection within the earth. In mantle convection, hot and light materials rises and keeps moving into upper crustal levels till they solidify. Here also, cold and denser materials sinks deeper till they turn to melt. This differences in temperature and density sets up a convective cell within the mantle. Several convective cells are in the mantle.
2. A body is thrown vertically upward with a speed of 100 m/s.The time taken to be
the earth is
a. 10 sec
b. 20 sec
c. 15 sec
d. 5 sec
Answer:
b. 20 sec
Explanation:
y = y₀ + v₀ t + ½ g t²
0 = 0 + (100) t + ½ (-10) t²
0 = 100t − 5t²
0 = t (100 − 5t)
t = 0, t = 20
The body lands after 20 seconds.
During which two time intervals does the particle undergo equal displacement?
AB and BC
AB and EF
BC and DE
CD and DF
Answer:
BC and DE
Explanation:
In the given figure, the velocity time graph is shown. We know that the area under v-t curve gives the displacement of the particle.
Area under AB, [tex]d_1=\dfrac{1}{2}\times 2\times 10=10\ m[/tex]
Area under BC, [tex]d_2=\dfrac{1}{2}\times 2\times 4=4\ m[/tex]
Area under CD, [tex]d_3=\dfrac{1}{2}\times 2\times 7=7\ m[/tex]
Area under DE, [tex]d_4=\dfrac{1}{2}\times 2\times 4=4\ m[/tex]
Area under EF, [tex]d_5=\dfrac{1}{2}\times 2\times 3=3\ m[/tex]
So, form above calculations it is clear that, during BC and DE undergo equal displacement. Hence, the correct option is (c) "BC and DE = 4 meters".
Correct Answer:
AB & DE
Explanation:
I had just taken this test on Plato/Edmentum (physical science) and gotten the question correct
Earth has a mass of 5.97 x 10*kg, and a mean radius of 6.38 x 108m. What would be the orbital speed and period of a satellite in
orbit 1.44 x 109 m above Earth?
Explanation:
Centripetal acceleration = acceleration due to gravity
v² / r = GM / r²
Solving for velocity:
v = √(GM / r)
Given:
G = 6.67×10⁻¹¹ m³/kg/s²
M = 5.97×10²⁴ kg
r = 6.38×10⁸ m + 1.44×10⁹ m = 2.078×10⁹ m
v = √(6.67×10⁻¹¹ × 5.97×10²⁴ / 2.078×10⁹)
v = 438 m/s
Period is the time to travel one circumference:
T = 2πr / v
T = 2π (2.078×10⁹) / 438
T = 2.98×10⁷ s
T = 8290 hr
T = 345 days
Engineers and others who work with technology use——————- to predict possible outcomes. A science. B peers. C bias. D by-products
Engineers and others who work with technology use science (A) to predict possible outcomes.
Answer:
A. science
Explanation:
Engineers and others who work with technology use science to predict possible outcomes.
They use predictions based on what the scientific research has shown them.
In both the faraday and Henry experiments, a current was generated in the secondary coil by the phenomenon called ____?
Answer:
I think it's self inductance, but without knowing the options I'm not certain.
Answer:
induction
Explanation:
Energy does not have to involve motion. Question 11 options: True False
Guyz... Its my first question in this app... Pls do answer
Answer:
1.414
Explanation:
Snell's law states:
n₁ sin θ₁ = n₂ sin θ₂
where n is the index of refraction and θ is the angle of incidence (relative to the normal).
The index of refraction of air is approximately 1. So:
1 sin 45° = n sin 30°
n = sin 45° / sin 30°
n = 1.414
Round as needed.
Which is a chemical change?
A. Splitting water into hydrogen and oxygen.
B. Breaking a block of solid ice into smaller pieces.
C. Freezing liquid water.
D. Boiling Water
Answer:
A. Splitting water into hydrogen and oxygen.
Explanation:
A chemical change produces a new substance. ... A physical change does not produce a new substance. Changes in state or phase (melting, freezing, vaporization, condensation, sublimation) are physical changes.
Splitting water into hydrogen and oxygen.
The Doppler effect is the actual change in a star’s frequency of a wave.
True
False
The answer of this question maybe false
Answer:
False
Explanation: the Doppler effect is the
an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other.
When Jacob bats a baseball with a net force of 4.719 N, it accelerates 33 m/s2. What is the mass of the baseball?
Answer:
Mass=0.143 kg
Explanation:
From the Newton's second law of motion the force applied to an object is directly proportional to the acceleration produced and the acceleration is in the direction of the force.
F=ma where F is the force, m is the mass of the object and a i the acceleration.
m=F/a
=4.719N/33 m/s²
=0.143 kg
Which statement is true about the ideal mechanical advantage of a third-class lever?
It is always equal to 1.
It is always greater than 1.
It is always less than 1.
It can be less than, greater than, or equal to 1.
Answer:
C
Explanation:
The mechanical advantage is always less than 1 because the force needed to move an object is always greater than the weight of the object.
Answer:
It is always less than 1.
Explanation:
If a vector 2ỉ +3j +8k is perpendicular to the
vector 4j-4i + ak, then the value of a is
Explanation:
if two vectors are perpendicular to each other then thier dot product is equal to zero so (2i+3j+8k).(-4i+4j+ak)=0 (2)(-4) +(3)(4)+(8)(a) =0 -8+12+8a=0 4+8a=0 8a=-4
[tex]a = \frac{ - 4}{8} [/tex]
[tex]a = \frac{ - 1}{2} [/tex]
One charge is decreased to one-third of its original value,
and a second charge is decreased to one-half of its
original value.
How will the electrical force between the charges compare
with the original force?
o It will increase to six times the original force.
O It will increase to thirty-six times the original force.
It will decrease to one-sixth the original force.
It will decrease to one-thirty-sixth the original force.
Answer:
the Third option
Explanation:
Answer:
It will decrease to one-sixth the original force.
Explanation:
The electrical force is given by :
[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]..............(1)
Where
k is the electrostatic constant
r is the distance between charges
One charge is decreased to one-third of its original value, and a second charge is decreased to one-half of its original value.
i.e. [tex]q_1'=\dfrac{q_1}{3}[/tex]
and [tex]q_2'=\dfrac{q_2}{2}[/tex]
New force is given by :
[tex]F'=k\dfrac{q_1q_2}{6r^2}[/tex]
[tex]F'=\dfrac{F}{6}[/tex]
So, the new force will decrease to one-sixth the original force. Hence, the correct option is (c).
The density of some air at a pressure of 7720mmhg is 1.26kgm^-³. Determine its density at a pressure at 600mmHg?
Answer:
0.0979 kg/m³
Explanation:
Treating air as an ideal gas:
PV = nRT
n/V = P/RT
Density depends on both pressure and temperature. If we assume the temperature is constant, we can say that density is directly proportional to pressure.
ρ = kP
ρ/P = k
Writing a proportion:
(1.26 kg/m³) / (7720 mmHg) = ρ / (600 mmHg)
ρ = 0.0979 kg/m³
Answer:
[tex]\rho = 0.098 kg/m^3[/tex]
Explanation:
As we know that for ideal gas we will have
[tex]PV = nRT[/tex]
here we can convert it into the form of density
[tex]PV = \frac{m}{M}RT[/tex]
now we have
[tex]PM = \rho RT[/tex]
now if the temperature will remain constant then in that case
[tex]\frac{P}{\rho} = constant[/tex]
so we will have
[tex]\frac{P_1}{P_2} = \frac{\rho_1}{\rho_2}[/tex]
here we can plug in all values in it
[tex]\frac{7720}{600} = \frac{1.26}{\rho}[/tex]
now we have
[tex]\rho = \frac{600}{7720}(1.26)[/tex]
[tex]\rho = 0.098 kg/m^3[/tex]
what is aerodynamics
Answer:
the branch of mechanics that deals with the motion of air and other gases and with the effects of such motion on bodies in the medium.Compare aerostatics(def 1).
Explanation:
Answer:
Aerodynamics is the way air moves around things.
A ball is launched from a cliff with and initial velocity of 15 m/s at an angle of 40 above horizontal. If the ball lands 17.5 m away, determine the height of the cliff.
Explanation:
Evaluate in the x direction to find the time it takes to land:
x = x₀ + v₀ₓ t + ½ aₓ t²
17.5 = 0 + (15 cos 40) t + ½ (0) t²
t = 1.52
Evaluate in the y direction to find the initial height:
y = y₀ + v₀ᵧ t + ½ g t²
0 = h + (15 sin 40) (1.52) + ½ (-9.8) (1.52)²
h = -3.32
The cliff is actually 3.32 meters below where it lands. Make sure you copied the problem correctly.
Need help with science questions!
If W = Fd, which describes the conditions that make the work of moving this 10 kg mass the easiest on the mover?
A.
Moving the mass from Point C to B, although it involves a greater distance, requires less force to do the same amount of work.
B.
Moving the mass from Point A to B involves a shorter distance to do the same amount of work, even though it requires more force.
C.
Moving the mass from Point C to B, although it involves a greater distance, requires less force and less work.
D.
Moving the mass from Point A to B involves a shorter distance so less work is done, even though it requires more force.
Answer:
A. Moving the mass from Point C to B, although it involves a greater distance, requires less force to do the same amount of work.
Explanation:
The amount of work will be the same either way. By going from C to B, the mover will exert less force over a greater distance, which is easier than exerting a greater force over a shorter distance.
What type of force are you exerting when you stomp your foot on the ground
Final answer:
You exert a type of contact force called normal force when you stomp your foot on the ground, related to Newton's Third Law of Motion. While running or jogging, forces on the feet can be significantly greater, up to 2.5 times your body weight. The pressure results from your body mass, additional weight, and the surface area of the foot that makes contact.
Explanation:
When you stomp your foot on the ground, you are exerting a type of contact force known as a normal force. This action is governed by Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. Therefore, when your foot pushes against the ground, the ground pushes back with equal force. This force is a result of the pressure exerted by the stomp, which is a combination of the mass of your body and any additional weight you're carrying, and the surface area of your foot in contact with the ground.
When you're running or jogging, especially on hard surfaces or with insufficiently padded shoes, the forces on your feet and legs are significantly greater. They can be up to 2.5 times your body weight. This force can be calculated using the mass of the leg, the velocity at which it moves, and the distance over which it stops. Your own body weight also contributes to the force exerted on the ground during such activities. Proper foot arches help in absorbing this shock and reducing the impact on the rest of the body. When the downward motion of a runner's leg is stopped abruptly, the force required can be large and is impactful compared to the weight of the jogger.
Which types of electromagnetic waves have higher frequencies than the waves that make up ultraviolet light? Check all that apply
Answer:
X-rays
Gamma rays
Explanation:
The electromagnetic waves are arranged in order of their frequencies and wavelengths. This arrangement forms the electromagnetic spectrum. The x-rays and gamma rays form the part of the spectrum with highest frequencies and least wavelength. In the order of decreasing frequency and increasing wavelength, we start with Gamma rays ,x-rays uv, Visible light, Infrared light,Microwave then radio waves.
Answer:
X rays and Gamma rays.
Explanation:
The electromagnetic waves are arranged in the increasing frequency and energy while decreasing wavelength. So the waves on the right side of ultraviolet spectrum having higher frequency and energy and lower wave length. such as X RAYS AND GAMMA RAYS. Electromagnetic wave spectrum is arranged as.
Radio waves, microwaves, infrared waves, visible rays, ultraviolet waves, x rays, gamma rays.
Match each word with its definition.
scalar
1. distance plus direction
speed
2. 30 m/s northwest, for example
average speed
3. total distance divided by total time
what an object going around a curve at a constant speed is
undergoing
acceleration
5. 30 m/s, for example
displacement
6. any non-directional quantity
velocity
1. distance plus direction
displacement
2. 30 m/s northwest, for example
velocity
3. total distance divided by total time
average speed
4. what an object going around a curve at a constant speed is
undergoing
acceleration
5. 30 m/s, for example
speed
6. any non-directional quantity
scalar
The given terms are matched with their respective definitions as follows,
The distance plus direction is known as displacement, 30 meters / second northwest is an example of the velocity, total distance divided by the total time then an object going around a curve at a constant speed is undergoing acceleration.
What is displacement?Displacement describes this shift in location.
1. distance plus direction ⇒⇒displacement
2. 30 m/s northwest, for example, ⇒⇒velocity
3. Total distance divided by the total time ⇒⇒average speed
4. An object going around a curve at a constant speed undergoing ⇒⇒acceleration
5. 30 m/s, for example, ⇒⇒speed
6. Any non-directional quantity ⇒⇒ scalar
Thus, An object traveling around a curve at a constant speed experiences acceleration. Distance plus direction is known as displacement, and 30 meters per second to the northwest is an example of velocity.
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Repeating your experiment _____. A. increases validity B. decreases validity C. has no effect on validity
Answer:
C. has no effect on validity
Explanation:
Repeating your experiment has no effect on validity.
It doesn't matter how many times you repeat your experiment. You have to find the average outcome of each experiment you do.
A solid weighs 277.5 g in air and 212.5 g when totally immersed in the liquid of density 0.9 g/ cc. Calculate the density of the solid.
Answer:
3.842 g/cm³
Explanation:
Three forces are acting on the solid: weight, normal force (apparent weight), and buoyancy.
∑F = ma
N − m g + ρf V g = 0
N − ρs V g + ρf V g = 0
ρs is the density of the solid and ρf is the density of the fluid it is submerged in.
Writing normal force in terms of apparent mass, N = mₐ g:
mₐ g − ρs V g + ρf V g = 0
mₐ − ρs V + ρf V = 0
mₐ = ρs V − ρf V
mₐ = V (ρs − ρf)
V = mₐ / (ρs − ρf)
Volume is constant, so:
mₐ / (ρs − ρf) = mₐ / (ρs − ρf)
277.5 / (ρ − 0.0) = 212.5 / (ρ − 0.9)
Cross multiply and solve:
212.5ρ = 277.5 (ρ − 0.9)
212.5ρ = 277.5ρ − 249.75
249.75 = 65ρ
ρ = 3.842
The density of the solid is 3.842 g/cm³.
20 points, please help asap!! Needs to be done by today/tonight!! So please help me!!
Describe the appearance of the moon and its position during each phase:
• New moon:
• Waxing crescent moon:
• First quarter moon:
• Gibbous moon:
• Full moon:
• Waning gibbous moon:
• Third quarter moon:
• Waning crescent moon:
Answer:
New Moon
The Moon's position in space at New Moon.
New Moon is the first primary phase and it occurs the moment when the Sun and Moon are aligned, with the Sun and Earth on opposite sides of the Moon.
A New Moon cannot normally be seen from Earth since only the dark side of the Moon faces our planet at this point. Sometimes, if the New Moon is close to the Lunar nodes of its path, it can cause a Solar Eclipse.
The greatest difference between high and low tide, also known as spring tides, takes place around New Moon and Full Moon.
Waxing Crescent Moon
The moment a thin sliver of the Moon becomes visible after New Moon is the beginning of the first intermediate phase, the Waxing Crescent Moon.
In the past, this used to be called New Moon while the darkest phase was called Dark Moon. This traditional definition of New Moon is still in use in some cultures, defining the beginning of the months for instance in the Islamic calendar.
The rest of the Moon is also sometimes faintly visible during most of this phase because Earth also reflects sunlight onto the Moon, a phenomenon called earthshine.
First Quarter Moon
First Quarter Moon is the second primary phase.
First Quarter Moon is the second primary Moon phase and it is defined as the moment the Moon has reached the first quarter of its orbit around Earth, hence the name. It is also called Half Moon as we can see exactly 50% of the Moon's surface illuminated. Whether you see the left or right half illuminated, depends on several factors, including your location.
The smallest difference between high and low tide, also known as neap tides, occurs around the 2 Quarter Moons.
Waxing Gibbous Moon
The second intermediate phase, the Waxing Gibbous Moon, lasts until the next primary phase. Waxing means that it is getting bigger. Gibbous refers to the shape, which is larger than the semicircle shape of the Moon at First Quarter, but smaller than a full circle.
Full Moon
Full Moon is the brightest phase.
@timeanddate.com
The Full Moon appears in the night sky when the Sun and the Moon are aligned on opposite sides of Earth.
How can Full Moon be in the daytime?
Technically, this alignment only lasts a moment. However, the Moon can appear to be full a day before or after while more than 98% of the Moon's disc is illuminated.
When a Full Moon occasionally passes through Earth's shadow, it will cause a lunar eclipse.
When the Full Moon comes close to the points of its orbit that are closest or farthest away from Earth, we call it a Supermoon or Micromoon, respectively.
What is the Moon Illusion?
Waning Gibbous Moon
The next intermediate Moon phase is the Waning Gibbous Moon. The portion of the visible half of the Moon illuminated decreases during this period.
Third Quarter Moon
Third Quarter Moon is the last primary phase.
The Third Quarter Moon occurs the moment the opposite half of the Moon is illuminated compared to the First Quarter Moon.
Waning Crescent Moon
The Waning Crescent Moon. The Sun illuminates less than half of the visible part of the Moon during this Moon phase and you can sometimes see earthshine on the rest of the Moon towards the end.
Explanation:
Answer:
The new Moon appears during a period when the earth, the Moon, and the Sun are all in a single line. Since the Moon is in between the Sun ad the Earth , the side of the Moon that directly facing the Earth is dark.
During full Moon, the three bodies are also approximately in a line, but the moon at this stage is on the other side of earth, so the Sun lights up the the section of the earth facing it.
At first quarter and last quarter, the Moon is located at a position perpendicular to a line between Earth and the Sun. one section of the moon is dark while the other will be brightened
Crescent refers to phases where the less than half of the moon is illuminated while gibbous is the phase where more than half of the moon is illuminated.
After the new Moon phase, The waxing crescent is visible due to exposure some reflected sunlight rays . The lunar crescent continue to grow until first-quarter Moon. As the right section of the Moon extend to more than half of the Moon's face, the Moon becomes waxing gibbous.
Then, right after the full Moon, the right section begins to reduce again to make a waning gibbous and which then turn into a third-quarter Moon. The exposure to sunlight continues to lessen until the moon is a waning crescent and then a new Moon. The full cycle is carried out in 29.5 days.
Do quasars reside within or without side of galaxies?
They almost entirely reside within galaxies because quasars are a subset of blackholes with a large and fast enough accretion disk to generate a beam of interstellar material perpendicular to itself. This typically only occurs in the largest black holes at the center of galaxies (supermassive blackholes) or at least stellar black holes---which still occur within galaxies because the material is necessary to form them.
Average velocity is different than average speed because calculating average velocity involves .
Average speed is total distance traveled divided by time. It is a scalar quantity (just magnitude).
Average velocity is displacement divided by time. It is a vector quantity (magnitude and direction).
An average velocity is different from average speed as average velocity is calculated using total displacement and total time into consideration.
Explanation:
The average velocity is calculated using the total displacement and total time, whereas the average speed is calculated using the total distance and total time.
“Average velocity is a vector quantity” and thus takes the magnitude and direction of vector displacement in calculation. Average speed is scalar quantity.
[tex]\text {Average velocity}=\frac{\text {Total displacement}}{\text {Total time}}[/tex]
3. A beam of light emerges from water into air at an angle. The beam is bent
a. towards the normal
b. away from the normal.
c. 48 degrees upward.
d. 96 degrees upward.
Pls reply fast
We have that the beam of light that emerges from water into air at an angle that bends
Away from the normal
Option B is correct
Normal of a Plane
In geometry, a normal is an object such as a line, ray, or vector that is perpendicular to a given object. The normal line to a plane curve at a given point is the line perpendicular to the tangent line to the curve at the point.
Therefore it is seen From the Question Image that
The Beam is NOT bent
Towards the normal 48 degrees upward. 96 degrees upward.But Rather
Away from the normal.
In conclusion
The beam of light that emerges from water into air at an angle that bends
Away from the normal
Option B is correct
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when two equal forces act on the same object in opposite directions, what is the net force?
Answer:
0
Explanation:
Forces with equal magnitudes and opposite directions cancel each other out, so the net force is 0.
Answer:
0
Explanation:
when you try to give two equal force on object in opposite side, the object will not move.hence the net force will be zero
mark me as brainliest please
what is the answer to this question I don't know it
Answer:
B
Explanation:
The apple is less dense than the water but not enough so to float with the least amount of apple submerged
Answer: Option B
Explanation: First, density is defined as mass/volume, so for two objects with the same volume, the more dense one has more weight.
Here we see that the apple is less dense than the water, which means that the water is heavier than the apple.
This means that only a tiny part of the apple will be submerged in the water (where the displaced water/profundity of the apple depends on the size of the apple, the displaced water must have the same weight than the apple, in that point the forces are canceled a the apple will be at rest)
The correct option is B
Communicating results allows scientists to learn from each other's results.
True
False
True, scientists often talk to each other to figure out if their results were similar and what they could have done better.
Although, talking to other scientists does have risks, other scientists could copy your work and further better it.
So, your final answer is TRUE, sorry for the long answer, I needed to have a word count about 20 characters and then I got carried away! lol