Answer:
the sun is 4.5 bill years old. and Astronomers estimate this to be a short 7 billion years from now before its explodes.
Explanation:
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 helium-neon laser (λ = 633 nm) illuminates a single slit and is observed on a screen 1.50 m behind the slit. The distance between the first and second minima in the diffraction pattern is 3.75 mm .
Required:
What is the width (in mm) of the slit?
Answer:
d = 0.25 mm
Explanation:
The position that the Minimal fall in single silt diffraction pattern can be written as
y=λmD/d ..........eqn(1)
(y2 - y1 )= difference of y that exist between first and second minima
D= distance of slit from the screen=1.50m
d= width of the slit
λ= 633 nm = 633×10^-9m
y= position of pth minimal
eqn(1) can be written as
(y2 - y1)= λmD/d .........eqn(2)
If we substitute the given values we have
(y2 - y1 )= [ (2×633×10^-9 × 1.50) /d] -[ (1×633×10^-9 × 1.50) /d]
Simplyfying
(y2 - y1)=(9.495×10^-7)/d
But The distance between the first and second minima in the diffraction pattern = 3.75, which implies that (y2 - y1) = 3.75mm=
✓ we can substitute (y2 - y1)= 3.75mm=3.75 ×10^-3 into expression above
3.75 ×10^-3 =(9.495×10^-7)/d
The we can make "d" subject of the formula
d=(9.495×10^-7)/ (3.75 ×10^-3)
d=0.00025m
d=0.25×10^-3 m
d=0.25 mm
Hence, the width (in mm) of the slit is 0.25mm
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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How does friction impact work? (that's the whole question)
The coefficient of friction on a surface is 0.25. A box requires 100N to slide it across the surface. What is the weight of the box?
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
A 600-MW steam power plant, which is cooled by a nearby river, has a thermal efficiency of 50 percent. Determine the rate of heat transfer to the river water. Will the actual heat transfer rate be higher or lower than this value
Answer: 600MW
Explanation:
First and foremost, we have to calculate the rate of heat that is supposed to the power plant. This will be:
= 600 / 50%
= 600 / 0.5
= 1200 MW
The rate of heat transfer to the river water will then be:
= 1200 - 600
= 600MW
Therefore, the actual heat transfer rate is thesame as this value as we got 600MW.
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
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
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:
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:
The properties of elements can be predicted by which of the following?
Answer:
1 Answer. The Periodic Table can predict the properties of new elements, because it organizes the elements according to their atomic numbers. Creating new elements is not a simple process. Scientists use a particle accelerator to smash light atoms into a thin metallic foil that contains heavier atoms.
Explanation:
As a projectile thrown upward moves in its parabolic path, at what point along its path are the velocity and acceleration vectors for the projectile perpendicular to each other
Answer: Maximum height
Explanation:
Suppose a projectile is thrown at an angle of [tex]\theta[/tex] with velocity u
As the projectile moves upward, its vertical component of velocity decreases due to gravity. While the horizontal component remains the same as there is no acceleration in the horizontal direction.
At maximum height vertical component of velocity is zero. At this instant horizontal component of velocity is perpendicular to the acceleration due to gravity. This can be explained with the diagram.
what are the properties of heat
Two isotopes of carbon, carbon-12 and carbon-13, have masses of 1.993 10^-26 kg and 2.159 10^-26 kg, respectively. These two isotopes are singly ionized ( e) and each is given a speed of 7.50 10^5 m/s. The ions then enter the bending region of a mass spectrometer where the magnetic field is 0.9000 T.
Required:
Determine the spatial separation between the two isotopes after they have traveled through a half-circle.
Answer:
0.0174 m
Explanation:
Given that:
mass of carbon 12 [tex]m_{c \ 12} = 1.993 \times 10^{-26} \ kg[/tex]
mass of carbon 13 [tex]m_{c \ 13} = 2.159 \times 10^{-26} \ kg[/tex]
Speed V = [tex]7.50 \times 10^ 5 \ m/s[/tex]
[tex]q = 1.6 \times 10^{-19 } \ C[/tex]
B = 0.9000 T
[tex]R_1 = \dfrac{ m_{c \ 12} \ v}{ qB}[/tex]
[tex]R_1 = \dfrac{ 1.993 \times 10^{-26} \ 7.50 \times 10^5}{ 1.6 \times 10^{-19} \times 0.90000}[/tex]
[tex]R_1 =0.1038 \ m[/tex]
[tex]R_2 = \dfrac{ m_{c \ 13} \ v}{ qB}[/tex]
[tex]R_2= \dfrac{2.159 \times 10^{-26} \ 7.50 \times 10^5}{ 1.6 \times 10^{-19} \times 0.90000}[/tex]
[tex]R_2 = 0.1125 \ m[/tex]
The spatial separation (D) = [tex]2R_2 - 2R_1[/tex]
[tex]D = 2(0.1125 \ m) - 2(0.1038 \ m)[/tex]
D = 0.0174 m
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
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
which of the following statements best describes the balls motion ?
Answer:
C
Explanation:
A rock sinks through water at a constant speed. What energy conversion is occurring?
Answer:
Kinetic to potential energy.
Explanation:
A rock sinks through water at a constant speed is a type of kinetic to potential energy conversion. The rock movement refers to kinetic energy whereas sinking in the water represents potential energy due to movement from top to bottom in the water. So we can say that the kinetic to potential energy conversion is occurring in this example.
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.A rocket engine has a chamber pressure 4 MPa and a chamber temperature of 2000 K. Assuming isentropic expansion through the nozzle, and an exit Mach number of 3.2, what are the static pressure and temperature in the exit plane of the nozzle
This question is incomplete, the complete question is;
A rocket engine has a chamber pressure 4 MPa and a chamber temperature of 2000 K. Assuming isentropic expansion through the nozzle, and an exit Mach number of 3.2, what are the stagnation pressure and temperature in the exit plane of the nozzle? Assume the specific heat ratio is 1.2.
Answer:
- stagnation pressure is 274.993 Mpa
- the stagnation temperature Tt is 4048 K
Explanation:
Given the data in the question;
To determine the stagnation pressure and temperature in the exit plane of the nozzle;
we us the expression;
Pt/P = (1 + (γ-1 / 2) M²)^(γ/γ -1) = ( Tt/T )^(γ/γ -1)
where Pt is stagnant pressure = ?
P is static pressure = 4 MPa = 4 × 10⁶ Pa
Tt is stagnation temperature = ?
T is the static temperature = 2000 K
γ is ratio of specific heats = 1.2
M is Mach number M = 3.2
we substitute
Pt/P = (1 + (γ-1 / 2) M²)^(γ/γ -1)
Pt = P(1 + (γ-1 / 2) M²)^(γ/γ -1)
Pt = 4 × 10⁶(1 + (1.2-1 / 2) 3.2²)^(1.2/1.2 -1)
Pt = 4 × 10⁶ × 68.7484
Pt = 274.993 × 10⁶ Pa
Pt = 274.993 Mpa
Therefore stagnation pressure is 274.993 Mpa
Now, to get our stagnation Temperature
Pt/P = ( Tt/T )^(γ/γ -1)
we substitute
274.993 × 10⁶ Pa / 4 × 10⁶ Pa = ( Tt / 2000 )^(1.2/1.2 -1)
68.7484 = Tt⁶ / 6.4 × 10¹⁹
Tt⁶ = 68.7484 × 6.4 × 10¹⁹
Tt⁶ = 4.3998976 × 10²¹
Tt = ⁶√(4.3998976 × 10²¹)
Tt = 4047.999 ≈ 4048 K
Therefore, the stagnation temperature Tt is 4048 K
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
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
The figure shows a cube resting on top of a table . If the table rotates and moves the cube in a counterclockwise circle at a constant speed , describe the direction of the acceleration experienced by the cube .
Answer:
Forwarded
Explanation:
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
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 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
pls explain why
two cars start a trip of 200 km at the same time. the first car travels at 90 km/h and the second at 110 km/h. how much more time in minutes does it take for the slower car to reach its destination?
Answer:
5
Explanation:
give thanks pls
A car accelerates from rest at 2 m/s2. After 6 seconds, what is the speed of the car?
Answer:
Vf = 12 [m/s]
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f}=v_{o}+a*t\\[/tex]
where:
Vf = final velocity [m/s]
Vo = initial velocity = 0 (stars from the rest)
a = acceleration = 2 [m/s²]
t = time = 6 [s]
Now replacing:
[tex]v_{f}=0+2*6\\v_{f}=12[m/s][/tex]
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
