Explanation:
The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength.
A car goes around a curve at 20. m/s. If the radius of the curve is 40 m, what is the centripetal acceleration of the car?
Answer:
The centripetal acceleration of car is 8 m/s².
Explanation:
Akhtar, Kiran and Rahul were riding in a motorocar that was moving with a high velocity on
an expressway when an insect hit the windshield and got stuck on the windscreen. Akhtar
and Kiran started pondering over the situation. Kiran suggested that the insect suffered a
greater change in momentum as compared to the change in momentum of the motorcar(because the change in the velocity of the insect was much more than that of the motorcar).
Akhtar said that since the motorcar was moving with a larger velocity, it exerted a larger
force on the insect. And as a result the insect died. Rahul while putting an entirely new
explanation said that both the motorcar and the insect experienced the same force and a
change in their momentum. Comment on these suggestions.
Answer:
According to the law of conservation of momentum:
Momentum of the car and insect system before collision = Momentum of the car and insect
system after collision
Hence, the change in momentum of the car and insect system is zero.
The insect gets stuck on the windscreen. This means that the direction of the insect is
reversed. As a result, the velocity of the insect changes to a great amount. On the other hand,
the car continues moving with a constant velocity. Hence, Kiran’s suggestion that the insect
suffers a greater change in momentum as compared to the car is correct. The momentum of
the insect after collision becomes very high because the car is moving at a high speed.
Therefore, the momentum gained by the insect is equal to the momentum lost by the car.
Akhtar made a correct conclusion because the mass of the car is very large as compared to
the mass of the insect.
Rahul gave a correct explanation as both the car and the insect experienced equal forces
caused by the Newton’s action-reaction law. But, he made an incorrect statement as the
system suffers a change in momentum because the momentum before the collision is equal to
the momentum after the collision.
The burning of a log releases the logs chemical_energy into other forms of energy
Answer:
When we burn wood we are releasing solar energy, in the form of heat, that has been stored in the wood as chemical energy. The process of photosynthesis converted solar energy, water and carbon dioxide into oxygen and the organic molecules that form the wood, half the weight of which is carbon.
Explanation:
You spend some time thinking about events that involve matter and energy. Consider balls of different shapes and materials that reach different heights as they bounce off the same floor. What aspects of this event relates to matter? What aspect relates to energy?
Answer:
Matter - The ball itself
Energy - the motion of the ball as they reach different height.
Explanation:
The aspect of the event which relates to matter is the ball itself being described above, this us because, the ball is a physical substance or material which possesses mass and occupies space.
The aspect which relates to energy in the event described above is the motion of the ball when bounced off the floor, changing from potential to kinetic energy depending on the height attained, at any instance, the total energy is the sum of the kinetic and potential energy, however, at maximum height, at rest, Potential energy is maximum with kinetic energy equal zero, at maximum height, kinetic energy then start to increase with height until it reaches it's the maximum height, where the direction changes, at this point kinetic energy turns to zero. Therefore, the motion of the ball and height attained relates to energy.
What is linear diameter of an object that has an angular diameter of 22 arc seconds and a distance of 1400 m
Answer:
0.15m
Explanation:
Given the following :
angular diameter = 22 arc seconds
Distance = 1400 m
The linear diameter(D) could be calculated using the small angle formular :
Where ;
D = (angular size × distance) / 1 radian
Note :
1 radian = 360°/2pi = 360/(2 × 3.14) = 57.296°
1° = 3600 arc seconds
57.296° × 3600 = 206265.6
Therefore,
D = (22 × 1400) / 206,265.6
D = 30800 / 206,265.6
D = 0.1493220
The diagrams at the right show the path of light as it passes from air into the three solids. What are the possibilities of the solids in A, B and C? Explain.
Answer:
when light falls on denser medium it may be reflected back or enters the medium and if it enters the medium it refracts towards the normal line of the medium.
The famous astronomer, Kepler, determined that the planetary orbits were: 1. ellipses 2. circles 3. epicentric 4. geocentric
Answer:
geocentric
i hope this helps!!!!
Explanation:
Which statement represents how light travels? Light given off from a moving source will travel faster in a vacuum. Light given off from a moving source will travel faster in air. Light travels slower if the light source is moving. Light travels at the same speed even if the light source is moving.
Answer:
the first one
Explanation:
Answer:
Light travels at the same speed even if the light source is moving.
Explanation:
I took the test, hope this helps :)
a softball player moving 3.89 m/s starts a slide, decelerating at -1.44 m/s^2 for 4.80 m. how much time does the slide take? (she does not come to a stop)
Explanation:
We have,
Initial speed of a softball is 3.89 m/s
Deceleration of the ball is -1.44 m/s²
Distance covered by the ball is 4.8 m
It is required to find the time that the ball take when it slides. Let t is time. Using second equation of motion :
[tex]h=ut+\dfrac{1}{2}at^2[/tex]
Putting all the values we get :
[tex]4.8=3.89t+\dfrac{1}{2}(-1.44)t^2\\\\4.8=3.89t-0.72t^2\\\\t=1.9\ s \ \text{and}\ t=3.49\ s[/tex]
a ladybug falls into small hole. it takes 8.6s for the ladybug to hit the bottom. how deep is the hole? (take g=9.81 m/s²)
Answer:
Length of hole (s) = 362.77 m (Approx)
Explanation:
Given:
Time taken to hit the bottom (t) = 8.6 s
Acceleration due to gravity (g) = 9.81 m/s²
Find:
Length of hole (s) = ?
Computation:
Initial velocity (u) = 0 m/s
S = ut +1/2(gt²)
S = (0)(8.6) +1/2(9.81)(8.6)(8.6)
S = 1/2(9.81)(8.6)(8.6)
S = 1/2(9.81)(8.6)(8.6)
S = 362.7738
Length of hole (s) = 362.77 m (Approx)
which statement BEST compares the force of gravity on a school bus on a school day and a weekend?
Answer:
The force of gravity between the Earth and the school bus is more on a school day than on a weekend
Explanation:
The force of gravity, F, is the attractive force that holds objects in place on the Earth's surface
The force of gravity attracting the bus of mass m to the Earth of mass M having a radius of [tex]R_{Earth}[/tex], can be presented by the following equation;
[tex]F = \dfrac{G \times M \times m}{(R_{Earth})^2}[/tex]
Which shows that the force increases as the mass of the bus increases
Since the school bus mass on a school day when carrying Pupils is mare than the mass of the bus in the weekend when the bus is empty, the force of gravity between the Earth and the school bus is more on a school day than on a weekend.
find the kinetic energy of 5 litre of a gas at STP given standard pressure is 1.013 into 10 to the power 5 Newton per metre square
Answer:
1.52 kJ
Explanation:
Total kinetic energy in gas K = 3NkT/2 where N = number of molecules, K = Boltzmann constant and T = temperature.
Also from the ideal gas law, PV = NkT
substituting PV into K above
K = 3PV/2 where P = pressure = 1.013 × 10⁵ N/m² and V = volume of gas = 5 litres = 5 dm³ = 5 × 10⁻³ m³
K = 3 × 1.013 × 10⁵ N/m² × 5 × 10⁻³ m³/2
= 1519.5 J
= 1.5195 kJ
≅ 1.52 kJ
PLEASE HELP MEEE!!!
In a science experiment showing the splitting of water into Oxygen and hydrogen, two inverted test tubes of water were placed over the site of the reaction. (see the pic) How can you tell which one was catching the oxygen and which one was catching the hydrogen?
A. The hydrogen is a positive ion and will be located close to the negative terminal of the battery.
B. The oxygen is a negative ion which will be located next to the negative terminal of the battery.
C. There are 2 hydrogen atoms for every oxygen atom. The hydrogen will take up more space and is pushing the water lower in the test tube.
D. The hydrogen, being a smaller atom, will take up less space than the oxygen. It will push the water down less.
Answer:
Option C
Explanation:
Answer C is the correct option. water can be written as H₂O, which means that there are 2 Hydrogen atoms for every oxygen atom, therefore it will occupy more space than oxygen and push more. there is also one more possibility, if the splitting takes place in Hoffman's Voltameter then the Hydrogen will be close to the cathode as hydrogen is positive. Otherwise, option C is correct answer. Hope this Helps you!
In a parallel circuit with a 4 ohm and a 2 ohm resistor and a 12 volt source, what is the potential difference across the 4 ohm resistor?
Answer:
12volts
Explanation:
The potential difference between 4ohm resistor is 12volts because equal voltage is dropped in both resistor.
The picture clearly shows that the 4Ω resistor is connected directly to both terminals of the battery. If you connect a voltmeter to the ends of the resistor, the voltmeter is connected directly to the battery terminals. So the potential difference across the 4Ω resistor IS the potential difference across the battery . . . 12 volts.
As long as the battery is fresh enough to supply all the current that both resistors want, the 4Ω resistor doesn't even know that the 2Ω resistor is there. (And the feeling is mutual.)
The equation 2/1H+1/1H---->3/2He+energy represents the ___ of two hydrogen atoms.
Answer:
Nuclear Fusion
Explanation:
Nuclear fusion is the nuclear reaction in which two lighter nucleus combine to form a larger more stable nucleus with the release of energy.
²₁H + ¹₁H ⇒ ³₂He + energy
In this case, a hydrogen atom reacts with a deuterium atom to produce a helium atom and energy.
Since two smaller atoms combine to produce a larger atom, nuclear fusion occurs.
Answer:
Fusion
Explanation:
Fusion but nuclear fusion is right but only fusion for APE X is needed
Use the drop-down menu to complete the statement. Based on the data in the line graph, you can predict there will likely be visitors in December compared to October.
Answer:
Fewer
Explanation
Just did it on edge
Based on the data provided in the line graph, one can predict there will likely be less or fewer visitors in December compared to October.
What is line graph?The graph between two physical quantities in which the curve is a straight line. The line may be going upwards or downwards.
The slope is defined as the ratio of change in quantity on y axis and the change in quantity on x axis.
Slope is represented as
m = Δy / Δx
Given is graph(attached below) between the number of visitors and months. The graph is having positive slope till August and then after that slope is negative till December.
Positive slope means the change in quantity on y axis is increasing and negative slope is change in quantity on y axis is decreasing
When the number of visitors are compared, December month has less visitors than in the October month.
Thus, Based on the data provided in the line graph, one can predict there will likely be less or fewer visitors in December compared to October.
Learn more about line graph
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A car moving along a straight level road has an initial speed of 3 m s-1 and its acceleration is 2 m s-2? What
is the speed of the car after 5 s?
Answer:
13 ms-1
Explanation:
Answer:
SE RESUELVE CON LA ECUACIÓN DE GALILEO GALILEI
Explanation:
v = 3 m/s + [tex]2 m/s^{2}[/tex](5 s) = 13 m/s
Anna will wear a black dress when she attends her cousin’s wedding. Which color(s) does the dress absorb?
Answer:
The answer is all colors
Explanation:
which event is part of a convince part of a current in the air
A. warm air sinks
B. cool air rises
C. warm air swirls
D. cool air sinks
Answer:
D
Explanation:
Cool air sinks because it's denser and warm rises because it's less dense.
This is the principle you have in your air conditioning.
As the air is cooled it keeps falling that's why it's necessary to tilt the vents of of an AC at 45° so that the cold air would be well circulated.
Suppose you have a car with a battery that applies 12.5 V to the starter.
What is the effective resistance of a car’s starter when 125 A flows through it in Ω?
Answer:
R = 0.1 ohms
Explanation:
It is given that,
Voltage of the battery, V = 12.5 V
Current flowing in the car's starter, I = 125 A
We need to find the effective resistance of a car's starter. It can be calculated using Ohm's law. Let R is the resistance.
[tex]V=IR\\\\R=\dfrac{V}{I}\\\\R=\dfrac{12.5}{125}\\\\R=0.1\ \Omega[/tex]
So, the resistance of the car's starter is 0.1 ohms.
The distance, a , in the image represents
Answer:
the amplitude
Explanation:
the maximum distance at which the object gets displaced from its mean position is know as the amplitude. the straight indicates the mean position and 'a' is the maximum height at which the object is displaced.
A moving fan continues to move for a while even after switched off, why?
Answer:
due to the inertia of motion, the fan continues to move for some time even after switching it off.
Answer:
A fan has a property to follow it's circular motion even when the power supply is cut. A moving fan continues to move for a while even after switched off.
HOPE IT HELPS :)
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Suponiendo que la Tierra describe una órbita circular alrededor del Sol, calcula su velocidad de traslación. Dato: la distancia media de la Tierra al Sol es 149 600 000.
Answer:
v = 51.60 m/s
Explanation:
To calculate the velocity of the Earth around the sun you use the following formula, which comes from the universal gravitational Law:
[tex]v=\sqrt{\frac{GM_E}{r}}[/tex]
M_E: Earth's mass = 5.97*10^24 kg
r: distance between the Sun and the Earth = 149 600 000 km =m
G: Cavendish's constant = 6.674×10−11 m3⋅kg−1⋅s−2
You replace the values of G, M_E and r in the equation for v:
[tex]v=\sqrt{\frac{(6.674*10^{-11}m^3/kgs^2)(5.97*10^{24} kg)}{ 1.496*10^{11}m }}\\\\v=51.60\frac{m}{s}[/tex]
hence, the velocity of traslation of the Earth is 51.60 m/s
Molecules are groups of atoms connected together. Which substances in the simulation have particles that are
molecules?
Answer:
The particles in oxygen and water are made up of more than one atom, so they have particles that are molecules.
Explanation:
Who was this scientist, what ideas did he form, and how did he figure out these new ideas of atoms?
pls dont plagiarize!!
Answer:
Atoms cannot be divided.
Explanation:
A block is on a ship. Its weight is 45 N. The gravity acceleration g = 10 N/kg. When the block is brought to a space station surrounding the Earth, how much is its mass?
Answer:
4.5 kg
Explanation:
Since weight, W = mg where m = mass and g = gravity acceleration = 10 N/kg and W = 45 N
m = W/g
= 45 N/10 N/kg
= 4.5 kg
The mass of the block on the ship is thus 4.5 kg. Since mass is an intrinsic property of a substance and does not change with location, the mass of the block when it is brought to as space station surrounding the earth is also 4.5 kg.
Write to your government officials convincing them to invest in global warming prevention. Discuss the 6th Mass extinction event and give examples of previous extinctions.
write abt gobal warmingExplanation:
HI Please answer LOTS OF POINTS AVAILABLE
Answer:
1. It takes more force to push the door near hinges compared to pushing the door far from the hinges.
2.The turning effect of the force is called moment.
3.moment(Nm)=force(N)*distance from pivot(m)
mark brianliest if my answer suit your question
In order to fly horizonatally at a steady speed, which two of the forces shown on the aeroplane must be equal.
(The forces shown on the aeroplane are air friction, weight and engine thrust)
When charging an object by conduction, what happens to the charges in the
object?
A. Electrons move, giving the object a static charge.
B. The object is forced to generate extra electrons because of the
electric field.
C. The charges in it split up, with positive charges on one side, and
negative on the other.
D. The object moves, indicating it has acquired a charge.
Answer:
Option A
The electrons move, giving the object a static charge
Explanation:
When a neutral object is charged by conduction, it simply means that it is made to acquire a charges from another charged body, which is brought in contact with it.
When this happens, the electrons from a conductor, move into the neutral object giving it a static charge which is equal in polarity with the charge of the original conductor which was used to touch it.
Answer:
the answer is a
Explanation:
i just took a test and got this question right
