Answer:
c
Explanation:
just answered it
Answer:
C. The electromagnetic waves transfer energy.
Explanation:
A 0.750-m-long pulse is travelling at a speed of 6.12 m/s in a spring. How long does it take the pulse to pass any point on the spring?
Answer:
0.122secsExplanation:
Speed = Distance/Time
Given
Speed = 6.12m/s
Distance = 0.750m
Substitute
Time - Distance//Speed
Time = 0.75/6.12
Time = 0.122secs
Hence it takes the pulse 0.122secs
Which of the following is not true about minerals?
A
They always include oxygen and silicon.
B
They are naturally occurring materials.
C
They each have unique properties.
D
They have a crystalline structure.
It is not true about minerals, that they always include oxygen and silicon. Option (A) is correct.
Minerals are inorganic, naturally occurring substances with a crystalline structure and a particular chemical makeup. They are solid substances that are created over a long period of time by geological processes in the crust of the Earth.
Even while silicon and oxygen are frequently occurring components in many minerals, not all minerals necessarily contain these elements. Minerals are inorganic, naturally occurring substances with a crystalline structure and a particular chemical makeup. They can be made of a wide range of substances, including silicon and oxygen, among others.
Hence, It is not true about minerals, that they always include oxygen and silicon. Option (A) is correct.
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A baseball player swings his bat with hisarms fully extended. If hisarms are pulled in closer to the body, and he swings again, which of the following is true aboutthe angular momentum and kinetic energy of the player?
Angular Momentum Kinetic Energy
(A) Increases Increases
(B) Increases Remains Constant
(C) Remains Constant Increases
(D) Remains Constant Remains Constant
(E) Decreases Remains Constant
Answer:
(D) Remains Constant Remains Constant
Explanation:
Taking a swing with his arms closer to his body does not change the angular momentum or kinetic energy of this player.
The angular momentum is constant or stays the same if an object is spinning, except there is an external torque which acts on it. Also the kinetic energy stays constant as long as magnitude still remains the same and the only thing that is changing here is direction
What is an example of a secondary group?
A. the attendees of a video-gaming conference
B. the employees of Coca-Cola Corporation
C. the members of a family
D. the teachers from the science department
Answer:(D)The teachers from the science department
Explanation:I took the quiz
The micrometer (1 μm) is often called the micron. (a) How many microns make up 3.0 km? (b) How many centimeters equal 3.0 μm? (c) How many microns are in 3.0 yd?
Answer:
3 x 10⁻⁹km
3 x 10⁻⁴cm
2.73 x 10⁶μm
Explanation:
A micron is a subunit of measurement usually for length dimensions.
1μm = 1 x 10⁻⁶m
a. How many microns make up 3km;
Now convert to meter first;
1000m = 1km
So, 3km will be made up of 3000m
So;
1 x 10⁻⁶m = 1μm
3000m = [tex]\frac{3000}{1 x 10^{-6} }[/tex] = [tex]\frac{3 x 10^{3} }{ 1 x 10^{-6} }[/tex] = 3 x 10⁻⁹km
b. How many centimeters equal 3.0 μm?
Since;
1μm = 1 x 10⁻⁶m
3μm = 3 x 1 x 10⁻⁶ = 3 x 10⁻⁶m
So;
100cm = 1m;
1m = 100cm
3 x 10⁻⁶m = 3 x 10⁻⁶ x 10² = 3 x 10⁻⁴cm
c. How many microns are in 3.0 yd?
1yd = 0.91m
3yd = 3 x 0.91 = 2.73m
So;
1 x 10⁻⁶m = 1μm
2.73m will give [tex]\frac{2.73}{1 x 10^{-6} }[/tex] = 2.73 x 10⁶μm
HELLP FO MY FINAL
At an air show, you are watching a group of skydivers when a friend says, "We learned in science class that things fall to Earth because of the law of gravity."
Tell what is wrong with your friend's statement, and explain your reasoning
kate is participating in a race.she ran 300 meters in 3 minutes.what is her average speed in m/min?
Answer:
Her average speed is: 100 m/min
Explanation:
Recall that the formula for average speed is given by:
Speed = Distance / time
Then in our case, this is
Speed = 300 m / 3 min = 100 m/min
The winter solstice, the shortest day of the year in the Northern hemisphere, occurs when the Earth is in which position?
Answer:
A
Explanation:
How long does it take for an airplane to change its velocity from 140 m/s to 180 m/s if its
acceleration is 4.0 m/s?? How far does it travel during this time? (10. s, 1600 m)
Proof please
Answer:
Explanation:
a = 4ms⁻², Vf = 180 m/s & Vi = 140m/s
a = [tex]\frac{Vf-Vi}{t}[/tex]
4 = [tex]\frac{180-140}{t}[/tex]
t = 40/4
t = 10sec
To Measure Distance Use third Equation of Motion:
2aS = Vf²-Vi²
S = [tex]\frac{180*180 - 140*140}{2(4)}[/tex]
S = 12800/8 = 1600m
Plzzzzz help me plzzz
Why does the shape of the lens in your eye change?
The Lens Changes Shape to Focus Near Objects. Light rays from objects that are close to the eye are not parallel. Therefore, the eye must bend them more in order to focus the rays on the retina. To accomplish this, the lens change shape.
Hope this helps
Answer:
to focus the light
a particle is moving with shm of period 8.0s and amplitude 5.0cm. find (a) the speed of particle when it is 3.0m from the centre of its motion(b) the maximium speed (c) the maximium acceleration
Answer:
a) [tex]speed=\pi cm/s[/tex]
b) [tex]v_{max}=\frac{5\pi}{4} cm/s[/tex]
c) [tex]a_{max}=\frac{5\pi^{2}}{16} cm/s^{2}[/tex]
Explanation:
The very first thing we must do in order to solve this problem is to find an equation for the simple harmonic motion of the given particle. Simple harmonic motion can be modeled with the following formula:
[tex]y=Asin(\omega t)[/tex]
where:
A=amplitude
[tex]\omega[/tex]= angular frequency
t=time
we know the amplitude is:
A=5.0cm
and the angular frequency can be found by using the following formula:
[tex]\omega=\frac{2\pi}{T}[/tex]
so our angular frequency is:
[tex]\omega=\frac{2\pi}{8s}[/tex]
[tex]\omega=\frac{\pi}{4}[/tex]
so now we can build our equation:
[tex]y=5sin(\frac{\pi}{4} t)[/tex]
we need to find the speed of the particle when it is 3m from the centre of its motion, so we need to find the time t when this will happen. We can use the equation we just found to get this value:
[tex]y=5sin(\frac{\pi}{4} t)[/tex]
[tex]3=5sin(\frac{\pi}{4} t)[/tex]
so we solve for t:
[tex]sin(\frac{\pi}{4} t)=\frac{3}{5}[/tex]
[tex]\frac{\pi}{4} t=sin^{-1}(\frac{3}{5})[/tex]
[tex]t=\frac{4}{\pi}sin^{-1}(\frac{3}{5})[/tex]
you can directly use this expression as the time or its decimal representation:
t=0.81933
since we need to find the speed of the particle at that time, we will need to get the derivative of the equation that represents the particle's position, so we get:
[tex]y=5sin(\frac{\pi}{4} t)[/tex]
[tex]y'=5cos(\frac{\pi}{4} t)*\frac{\pi}{4}[/tex]
which simplifies to:
[tex]y' =\frac{5\pi}{4}cos(\frac{\pi}{4} t)[/tex]
and we can now substitute the t-value we found previously, so we get:
[tex]y'=\frac{5\pi}{4}cos(\frac{\pi}{4} (0.81933))[/tex]
[tex]y'=\pi[/tex]
so its velocity at that point is [tex]\pi[/tex] cm/s
b) In order to find the maximum velocity we just need to take a look at the velocity equation we just found:
[tex]y' =\frac{5\pi}{4}cos(\frac{\pi}{4} t)[/tex]
its amplitude will always give us the maximum velocity of the particle, so in this case the amplitude is:
[tex]A=\frac{5\pi}{4}[/tex]
so:
[tex]v_{max}=\frac{5\pi}{4} cm/s[/tex]
c) we can use a similar procedure to find the maximum acceleration of the particle, we just need to find the derivative of the velocity equation and determine its amplitude. So we get:
[tex]y'= \frac{5\pi}{4}cos(\frac{\pi}{4} t)[/tex]
We can use the chain rule again to find this derivative so we get:
[tex]y" =-\frac{5\pi}{4}sin(\frac{\pi}{4} t)*(\frac{pi}{4})[/tex]
so when simplified we get:
[tex]y"=-\frac{5\pi^{2}}{16}sin(\frac{\pi}{4} t)[/tex]
its amplitude is:
[tex]A=\frac{5\pi^{2}}{16}[/tex]
so its maximum acceleration is:
[tex]a_{max}=\frac{5\pi^{2}}{16} cm/s^{2}[/tex]
will give brainliest :)Two objects having equal masses and velocities collide with each other and come to a rest. What type of a collision is this and why?
A. Elastic collision, because internal kinetic energy is conserved
B .Inelastic collision, because internal kinetic energy is not conserved
C. Elastic collision, because internal kinetic energy is not conserved
D. Inelastic collision, because internal kinetic energy is conserved
Answer:
B. lnelastic collision, because interest kinetic energy is not conserved .
I hope it helps ❤❤
The type of collision experienced by the two objects is inelastic collision, because internal kinetic energy is not conserved.
There are two types of collisions that two objects moving directly or opposite each may experience:
Elastic collision, andInelastic collision.In elastic collision, both momentum and kinetic energy of the to objects are conserved.
In inelastic collision, only momentum is conserved while kinetic energy decreases after the collision.
Thus, we can conclude that the type of collision experienced by the two objects is inelastic collision, because internal kinetic energy is not conserved.
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In a liquid, objects denser than the liquid (such as rocks) tend to sink, while objects less dense than the liquid (such as inflatable rafts) tend to rise. How does this relate to the observed motions of the liquid in the beaker
Answer is given below :
Explanation:
If an object weighs more than the weight of the fluid placed in it it will sink. Then floating, which is directly related to the weight or density of the fluid. A more dense, or heavier fluid is capable of "floating" heavy objects. Proper floating object should be completely above the liquid surface. All floating objects must have some trapped air and this is the only reason they float. The amount of liquid that an object floats on is important in some way, The density of an object determines whether it floats or sinks to another material. An object floats if it is less dense than the liquid contained in it. If an object is thicker than the liquid in which it is placed it will sink. If the density of an object in the fluid is greater than the density. Liquid, the object sinks. If the density is lower than the liquid, the object will float up as the fluid is produced. The product of the density of the liquid volume during acceleration due to gravity is light energy. Therefore, increasing the density of the fluid increases the light energy.How does friction impact work? (that's the whole question)
Two long parallel wires are 4 cm apart and carry currents of 2 A and 6 A in the same direction. calculate the force between the wire perimeter of wire length
Answer:
The force per unit length of the wire is 6 x 10⁻⁵ N/m.
Explanation:
Given;
distance between the two parallel wires, r = 4 cm
current in the first wire, I₁ = 2 A
current in the second wire, I₂ = 6 A
The force per unit length of the wire is calculated as;
[tex]\frac{f}{l} = \frac{\mu I_1 I_2}{2\pi r} \\\\\frac{f}{l} =\frac{4\pi \times 10^{-7} \ \times \ 2 \ \times \ 6}{2\pi \ \times \ 0.04} \\\\\frac{f}{l} = 6 \ \times \ 10^{-5} \ N/m\\\\[/tex]
Therefore, the force per unit length of the wire is 6 x 10⁻⁵ N/m.
A flower vase is sitting on a shelf when a gust of wind from an open
window blows it down. If the vase has a mass of 0.6 kg and the shelf is 1.5
m off the ground, what is the gravitational potential energy of the vase
before it falls?
Answer:
8.82 J
Explanation:
Recall that gravitational potential energy is defined as:
U = m * g * h
Then in our case, the gravitational potential energy U would be:
U = 0.6 * 9.8 * 1.5 J = 8.82 J
Some one plz help plzzzz
Answer:
8mph
Explanation:
speed=mph.
half an hourx2.
4 milesx2.
8 miles per hour.
That is the speed.
Hope this helps :D
What are similarities between homogeneous mixture and
heterogeneous mixture
Answer:
they both are the mixture of substance
Answer:
a homogeneous mixture is a uniform mixture whose components appear to be in a single state while a heterogeneous mixture is non uniform mixture whose components remain separate
Explanation:
example of homogeneous_ water and ethanol
heterogeneous_ water and chalk
1. What is the frame of reference for a plane moving at 500 km/h?
O A the clouds
O B the other planes in the sky
O C the ground
O d the passengers
The answer is C, The ground
Explanation: Gradpoint
Every experiment most control for variables that are not being tested that might also affect the dependent variable. True or false
Answer: Scientist use an experiment to look for cause and effect relationships in nature. They design an experiment so that changes to one Variable (any factor, trait or ... Independent Variable = what you are testing or what you are in control of or what ... A part of the experiment that is not being tested and is used for comparison
Explanation:
if a object has a mass of 20g and a volume of 3.5cm3 what is the density
Answer:
5.71 g/cm^3
Explanation:
Recall that density is defined as:
density = mass/volume
therefore in our casewe have:
density = 20 g / 3.5 cm^3 = 5.71 g/cm^3
1.
Examples of pure substances are elements and _________.
mixtures
compounds
2.
Iron and aluminum are examples of _____________.
pure substances
compounds
3.
A ____________ is a physical combination of things that can be separated.
mixture
compound
Answer:
compounds
pure substances
mixture
Answer:
1 . compound
2. pure substances
3. compound
Relationship between Animal and land
Andy is walking around the 100 meter track that has the start line on the west side of the field and has
the 100 meter finish mark on the East side of the field. If it starts at the 5.00 m mark and then travels to
the 8.00 m mark, what is its distance and displacement?
Answer:
its distance and displacement
Explanation:
What is your average velocity after going 15 meters east followed by 20 meters
west in 10 seconds?
Answer:
0.5 m/s
Explanation:
Velocity = displacement/time taken
going 15 meters east and then 20 meters west gives a displacement of 5 meters.
Velocity v = 5/10
= 0.5 m/s
2. A 60 kg diver jumps off a diving board with a height of 10
meters and accelerates toward the ground. At the point shown
in the diagram, she has 1,764 Joules of gravitational energy
and 4,116 Joules of kinetic energy. What is the diver's total
mechanical energy at that point?
Answer:5,880
Explanation:Lol if I get this wrong sorry I’m trying to do this also but if you add the 1,764 joules and 4,116 joules in total if you add them all up it’ll give you 5,880 hope that helps.
How can density of an object be determined
Answer:
To find the density of an object, start by determining the object's mass and volume. Then, divide the mass by the volume to find the object's density. Remember to write your answer in grams per cubic centimeter. If your answer is long, you can round it down to 2 or 3 digits past the decimal place!
Explanation:
Density of an object can be determined dividing mass with volume of the given object.
What is density and volume ?
Density is the measurement of compactness of the atoms, greater the atoms are compacted greater is the density of the material. Whereas, Volume is a three dimensional space occupy by the body of particular shape. Generally expressed in cubic meter.
Therefore, to find the density of an object first it should have known mass and volume. Now divide the mass with volume the result is the value of density. It must be noted that the units to be consider are mass in Kg, volume in m³ and the unit of density will be kg/m³.
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A train is moving in a straight railway where it covered one third of the distance with
a speed of 25 km/h and the remaining distance was covered by a speed of 75 km
so the average speed of this train is......... km/h
Answer:
The average speed of the train is 45 km/h
Explanation:
Speed
It's defined as the distance (d) per unit of time (t) traveled by an object. The formula is:
[tex]\displaystyle v=\frac{d}{t}[/tex]
Let's call x the total distance covered by the train. It covered d1=1/3x with a speed of v1=25 km/h. The time taken is calculated solving for t:
[tex]\displaystyle t_1=\frac{d_1}{v_1}[/tex]
[tex]\displaystyle t_1=\frac{1/3x}{25}[/tex]
[tex]\displaystyle t_1=\frac{x}{75}[/tex]
Now the rest of the distance:
d2 = x - 1/3x = 2/3x
Was covered at v2=75 km/h. Thus the time taken is:
[tex]\displaystyle t_2=\frac{d_2}{v_2}[/tex]
[tex]\displaystyle t_2=\frac{2/3x}{75}[/tex]
[tex]\displaystyle t_2=\frac{2x}{225}[/tex]
The total time is:
[tex]\displaystyle t_t=\frac{x}{75}+\frac{2x}{225}[/tex]
[tex]\displaystyle t_t=\frac{3x}{225}+\frac{2x}{225}[/tex]
[tex]\displaystyle t_t=\frac{5x}{225}[/tex]
Simplifying:
[tex]\displaystyle t_t=\frac{x}{45}[/tex]
The average speed is the total distance divided by the total time:
[tex]\displaystyle \bar v=\frac{x}{\frac{x}{45}}[/tex]
Simplifying:
[tex]\boxed{\displaystyle \bar v=45\ km/h}[/tex]
The average speed of the train is 45 km/h
Which is the BEST scientific explanation for temperature? *
A)how hot something is
B)how much kinetic energy an object has.
C)how far away molecules are from each other.
D)the average kinetic energy of the molecules.
Answer:
B
Explanation:
bc all the other answers seem way to simple and boring
