Answer:
A
Explanation:
SPEED = DISTANCE/TIME
Therefore:-
Speed = 400 m /5 min
Speed = 80m/min
How do you know where the centre of curvature(c) and the focal point(f) is on the principle axis
Answer:
C is radius of sphere
Explanation:
F is C/2
Light of frequency 2.5 x 1015 Hz illuminates a
piece of iron, and the iron emits photoelectrons
with a maximum kinetic energy of 6.3 eV. What is
the threshold frequency of the metal? Planck's
constant is 6.63 x 10-34 J·s.
.
Answer:
h f = W + KE
Input energy equals work function plus KE of emitted electron
W = 6.63E-34 * 2.5E15 - 6.3 * 1.6E-19
W = 6.63 * 2.5 * 10^-19 - 10.1 * E-19 ev (1ev = 1.6E-19 J)
W = (16.6 - 10.1)E-19 = 6.5E-19 J
h f = 6.5E-19 J for electrons to be emitted with zero KE
f = 6.5E-19 / 6.63E-34 = .98E-15 / sec = 9.8E-14 / sec (threshold)
8.54 Three identical balls of mass m are placed in the con-
figuration shown in the
figure. Find the location
(0, a)
of the center of mass.
50
(0,0)
(a,0)
The center of mass is the point located in an average position concerning the objects' positions and their masses. (a/3;a/3) is the location of the COM.
What si the center of mass?
The center of masses of a given system of particles or objects is the position under which all external forces are acting. Any uniform force acts on this point.
This position is the average position of all the components of the system concerning their masses. It can be placed in one, two or three dimensions according to the system.
Coordinate X of the center of masses is given by the following formula,
Xcom = Σ(Ximi) / Σmi
This is the adition (Σ) of each particle position on the X-axis (Xi) multiplied by their mass (mi), and the result divided by the summation of all masses -total mass-.
In the same way, coordinate Y of the center of masses is given by the following formula,
Ycom = Σ(Yimi) / Σmi
This is the adition (Σ) of each particle position on the Y-axis (Yi) multiplied by their mass (mi), and the result is divided by the summation of all masses.
The center of masses is located in the position (X, Y).
According to this framework, we can get the coordinates of the center of masses for this bidimensional system. Coordinates can be expressed in meters or centimeters (m or cm).
Data:
Particle ⇒ (X;Y)
Ball 1 ⇒ (0;a)Ball 2 ⇒ (0;0)Ball 3 ⇒ (a;0)Coordinate X ⇒ Xcom = Σ(Ximi) / Σmi
Xcom = (0m) + (0m) +(am) / m +m +m
Xcom = am / 3m
Xcom = a/3
Coordinate Y ⇒ Ycom = Σ(Yimi) / Σmi
Ycom = (am) + (0m) +(0m) / m +m +m
Ycom = am / 3m
Ycom = a/3
Coordinates of the center of masses, (X;Y) = (a/3 ; a/3)
(a/3 ; a/3) is the location of the center of mass in the proposed bidimensional system.
You can elarn more about the center of mass at
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The energy diagram shows the changes in energy during a chemical reaction.
Which statement best describes the total energy change of the system?
Potential energy
Reaction progress
A. The products have higher potential energy, and energy is released.
OB. The reactants have higher potential energy, and energy is
absorbed.
C. The products have higher potential energy, and energy is
absorbed
D. The reactants have higher potential energy, and energy is released.
Answer: The Energy Change
Explanation: change for a chemical reaction can either be exothermic if it gives off heat or endothermic if it requires heat to proceed. in a chemical reaction is due to the difference in the amounts of stored chemical energy between the products and the reactants. This stored chemical energy, or heat content, of the system is known as its enthalpy. energy changes that occur during a chemical reaction can be shown in a diagram called a potential energy diagram, or sometimes called a reaction progress curve. A potential energy diagram shows the change in potential energy of a system as reactants are converted into products.
how do you find spring constant from a weight (n) vs displacement (m) graph?
Answer:
Explanation:
The slope of the graph is the spring constant n/m
Which two types of electromagnetic waves have higher frequencies than the waves that make up ultraviolet light?
Answer:
the answer is equal to the wave make up ultraviolet light.
Seeds are often found on which part of a gymnosperm?
branch
leaf
cone
stem
The first spacecraft to make detailed maps of the galilean satellites of jupiter was/were.
Answer:
Voyager 1 and 2
Explanation:
How does a mutation in a gene affect a protein?
Answer:
a variant can cause a protein to malfunction or to not be produced at all.
When the north pole is tilted toward the sun, which area has the fewest hours of daylight?.
Answer:
The earth revolves around the sun in a plane called the ecliptic.
The poles of the earth are at an angle of about 23.5 deg from the ecliptic.
If the north pole is tilted at 23,5 deg towards a perpendicular to this plane (ecliptic) the south pole will be tilted at 23.5 deg away from this plane and will receive the least amount of sunshine.
This is called the summer solstice in the northern hemisphere. and occurs around June 21.
6. The star nearest to our Sun is Alpha Centauri, which is 4.3 light years away. A light
year is the distance that light travels in one year. 1 light year is about
9,500,000,000,000kilometers. Again, use the unit cancelation technique:
How many astronomical units is it to Alpha Centauri? HELP
Answer:
273,000 Astronomical Units.
Explanation:
4.3 light years = 40,850,000,000,000 kilometeres, 4.3 x 9,500,000,000,000.
Convert kilometers to astronomical unit:
149,597,870 kilometers = 1 AU, convert unit.
40,850,000,000,000 divided by 149,597,870 = 273,065.385222 or approx. 273,000 AU.
Which two statements about kinetic energy are true
a. It provides heat because heat is also related to kinetic energy.
b. It is found only in living things.
c. Its amount depends on the moving object's speed.
4. Which TWO images below show kinetic energy?
PLEASE HELP!!!
Answer:
A, C
Explanation:
It can be found in objects like a swing. It creates kinetic energy when it is coming back or going away, while moving.
Who gathered the data that showed planets traveling in elliptical paths around the sun? who discovered elliptical orbits? who explained them?.
Answer:
1. Who gathered the data that showed planets traveling in elliptical paths around the sun?
2. Who discovered elliptical orbits?
3. Who explained them?
Explanation:
1. Tycho Brahe was the one that gathered data.
2. Johannes Kepler discovered it using Tycho Brace’s Data.
3. I believe it was Johannes Kepler because he created 3 laws of it.
I apologize if it is incorrect-
I hope it helps! Have a great day!
Anygays-
A car is traveling at a speed of 9.88 m/s. It travels for 9.71 seconds. what distance did the car travel
Answer:
it should be 21,3 kilometer
In an experiment for measuring the speed of sound gun was shot 715 m away from the observer. It was heard 2. 13 seconds after the flash was seen. What was the speed of sound in air at that time?
The speed of the sound wave after the flash was seen, in the experiment for measuring the speed of sound gun is 110 m/s.
Speed of the sound waveThe speed of the sound wave can be determined by applying the principle of echoe as shown below;
v = 2d/t
where;
d is the distance of the sound wavet is time of motionv = (2 x 715) / (13)
v = 110 m/s
Thus, the speed of the sound wave after the flash was seen, in the experiment for measuring the speed of sound gun is 110 m/s.
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The upward force acting on the wing of an airplane ir flight is called?
Answer:
Lift is the upward force on the wing acting perpendicular to the relative wind and perpendicular to the aircraft's lateral axis. Lift is required to counteract the aircraft's weight.
Explanation:
Answer: The upward force acting on the wing of an airplane in flight is called Lift
What wave property is described as the number of waves produced by a source each second.
Answer:
Frequency
Explanation:
The Frequency of a wave is the number of waves produced by a source each second
A baseball is flying through the
air at 40 m/s east. This
measurement represents the
ball's
A. speed
B. velocity
C. inertia
D. force
Answer:
b
Explanation:
it indicate direction of baseball
Which of the following affects the strength of electric attraction/repulsion more: The magnitude of the charge or the distance between them?
(Standard SPS10 c)
A. The magnitude
B. The distance
C. Neither. They affect the strength the same amount ос
Answer:
Distance between them (r^2 )
Explanation:
F = C q1q2/r^2
1 point
What is the x component of a vector that is defined as
852m at 302°?
The x component of a vector that is defined as 852 cos 302°. Both the direction and the magnitude are required to define.
What is vector?Vectors seem to be a physical quantity with both magnitude and direction. While the scaler is the only quantity which is defined by the magnitude.
For example, distance is the scaler and the displacement is the vector quantity. Vector is shown by an arrow on the quantity.
A vector's scalar x-component is equal to the product of its magnitude and the cosine of its direction angle.
Hence, the x component of a vector that is defined as 852 cos 302°.
To learn more about the vector, refer to the link;
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An ideal gas is taken through a cyclic thermodynamic process through four steps. The amounts of heat given to the system in these steps are Q{1} = 1000J, Q{2} = - 800J, Q{3} = 450J , Q{4} = - 200 J respectively. The efficiency of cycle is nearly
Need full Explanation ! Answer is already marked in attachment just need the explanation or the way to reach the answer
We are given to find efficiency of the cycle.
We Know
Efficiency is denoted by the symbol "η"
[tex] \text{η\%} = \frac{ \text{Output Work}}{ \text{Heat Supplied } } \times 100[/tex]
As it is a cyclic process, So,
[tex] \triangle \text{U} = 0 \\ \implies \triangle \text{ Q} = \triangle \text{W} + \triangle \text {U} \\ \implies\triangle \text{ Q} = \triangle \text{W} + 0 \\ \implies \triangle \text{Q} = \triangle \text{W}[/tex]
[tex] \text{Let us first calculate} \: \triangle \text{Q}[/tex]
[tex]\triangle \text{Q} = \text{Q}_1 + \text{Q}_2 + \text{Q}_3 + \text{Q}_4[/tex]
[tex]\triangle \text{Q} = 1000 + ( - 800) + 450 + (- 200) \\ \\ \implies\triangle \text{Q} = 1000 - 800 + 450 - 200 \\ \\ \implies \triangle \text{Q} = 450 \text{J}[/tex]
[tex]\therefore \text{ Net Output Work i.e., ∆W = 450 J}[/tex]
Now, We need to find the Heat Input.
We know, Heat Input is always the sum of all positive heats
[tex] \because {∆Q_{in}} = \text{∆Q}_1 + \text{∆Q}_3 \\ \\ 1000 + 450 = 1450 \text{J}[/tex]
Now We Have To Find The η%
[tex] \text{η\%} = \frac{ \text{Output Work}}{ \text{Heat Supplied } } \times 100[/tex]
[tex] \text{η\%} = \frac{ \text{450}}{ \text{1450 } } \times 100 \\ \\ \implies \text{η\%} = \frac{ \text{450}}{ \text{145} \cancel{0 } } \times 10 \cancel0 \\ \\ \implies\text{η\%} = \frac{ \text{450}}{ \text{145 } } \times 10 \\ \\ \implies{ \text{η\%}} = \frac { \cancel{450}}{ \cancel{145}} \times 10 \: \: \: \: \fbox{cancelling by 5} \\ \\ \implies{ \text{η\%}} = \frac{90}{29} \times 10 \\ \\ \implies{ \text{η\%}} = 31.0344\% \\ \\ \implies{ \text{η\%}} = \red{31\%}[/tex]
Option A= 31% is the correct answer
Hope this helps!!True or False [2 pts]: As the distance d between a planet and a moon is increased, the strength of tidal forces decreases linearly (i.e., the strength of tides scales as 1/d).
It is true that as the distance d between a planet and a moon is increased, the strength of tidal forces decreases linearly (i.e., the strength of tides scales as 1.
What is Tidal force?.Tidal force is the gravitational force that a body on a linear motion experiences which pull the body towards the center of the mass of another varying body because of the gravitational pull of that body at a distance.
Therefore, It is true that as the distance d between a planet and a moon is increased, the strength of tidal forces decreases linearly (i.e., the strength of tides scales as 1.
Learn more about tidal force below.
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Can anyone help me?
Answer:
option d is your answer
Explanation:
you can find the complete solution in the given attachment
I hope it helped you
Help please!!
Daryl uses a microphone connected to an oscilloscope to study sound waves. He finds that higher pitched sounds have higher frequencies and shorter wavelengths while lower pitched sounds have lower frequencies and longer wavelengths. Daryl concludes that the relationship between the frequency and the wavelength of sound waves in air is the result of causation and not correlation. In two to three sentences, describe whether Daryl's conclusion is correct and explain why or why not.
In my opinion, the relationship between the frequency and the wavelength of sound waves in air is the result of correlation.
Relationship between frequency and wavelengthFrequency and wavelength are inversely proportional to each other which means if the frequency increases the wavelength decreases and when the frequency decreases, the wavelength increases.
So we can conclude that the relationship between the frequency and the wavelength of sound waves in air is the result of correlation.
Learn more about sound here: https://brainly.com/question/1199084
Daryl's conclusion about the relationship between frequency and wavelength is accurate because this is the result of causation.
What is the difference between causation and correlation?Causation implies one factor is the cause of another. For example, plants' need for the sun causes them to grow towards the sun.
On the other hand, correlation occurs if two factors are related and therefore the increase in one factor affects the other. For example, the amount of daylight affects plants' photosynthesis rate.
Are frequency and wavelenght an example of causation or correlation?These two factors are an example of causation because a higher frequency in waaves leads to shorter wavelenghts and vice-versa.
Learn more about causation in: https://brainly.com/question/10971583
Whats a main difference between Earth and Jupiter?
Answer:
Jupiter has a diameter of about 88,695 miles (142,800 kilometers) which is more than 11 times the diameter of Earth
please mark me as the brainliest. ;)
he electric motor of a model train accelerates the train from rest to 0.720 m/s in 29.0 ms. The total mass of the train is 840 g. Find the average power delivered to the train during its acceleration. W
Answer:
7.481W
Explanation:
power= work done÷time
power= force × uniform velocity
a= ∆v/t
29.0ms=
[tex]29 \times {10}^{ - 3 } s [/tex]
=(0.72-0)÷29×10^-3
a=24.83m/s^2
Newton's second law
f=ma
=(0.84×24.83)
=20.86N
w=FD
v^2=u^2+2as
0.5184=0+49.66s
s=0.0104m
20.86×0.0104
=0.216944J
0.216944÷t
P=7.481W
If the force that propels the cannonball forward is 500 N, how much force will move the cannon
backward? Explain.
Answer:
500N
Explanation:
This is due to Newton's third law of motion. For every action, there is an equal and opposite reaction. This encapsulates the conservation of momentum into a single idea.
How is thermal energy transferred during conduction? check all that apply.
Answer:
Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules
Explanation:
Is cereal consider soup?
Answer:
Explanation:
I guess so because it has ingredients such as froot loops, frosted flakes, and such plus its liquid.
What are some examples of why parallel circuits are good for everyday life?
Explanation:
Parallel circuits are used in wiring almost everything in buildings. You use them to turn on the lights in a room, Use a blow dryer, or plug anything into an outlet