HELP PLEASE!! 15 points awarded!
Element A combines with element B to make molecule AB(little 2). If the relative atomic mass of A is 10 and the relative atomic mass of B is 20. What mass of B will combine with 4g of A?
Answer:
its b
Explanation:
cause im in 7th grade ive been asked the same question
PLEASE HELP! Need this ASAP (in 10 minutes)
What happens to the speed (velocity) of a sound wave if the frequency decreases? (Assume the wavelength is constant.)
A. The speed is unchanged.
B. The speed quickly increases and then stops.
C. The speed increases.
D. The speed decreases.
Hi, why do waves with longer wavelengths travel further than waves with shorter wavelengths?
Answer:
ones longer than the other daa
Explanation:
Answer:
well, because of the moon!
Explanation:
you see, the moon is what controls the waves. waves are most commonly caused by wind. wind-driven waves, or surface waves, are created by the friction between wind and surface water. as wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest. the gravitational pull of the sun and moon on the earth also causes waves. so when the gravitation pull is weak, it creates the shorter wavelengths. without a stong pull, they don't go as far. when the pull is strong, the waves with longer wavelengths go further.
which is the best insulator? metal, glass, plastic, or Styrofoam?
Answer:
Styrofoam would be the best insulator because it traps the air in small pockets, blocking the flow of heat energy.
Explanation:
Compare and contrast a gas and a solid.
19 points ??? ASAP
Answer:
Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Explanation:
gases are well separated with no regular arrangement.
solid are tightly packed usually in regular
pattern.
A spring with a spring constant of 50 N/m is displaced by a force of 40 N. What is the displacement of the spring? (Fₛ = k Δx)
Answer:
The spring stretches or compresses 0.8 m (80 cm)
Explanation:
Hooke's Law
The force (F) needed to stretch or compress a spring by some distance Δx is given by
[tex]F=-k\Delta x[/tex]
Where k is a constant factor characteristic of the spring.
We are given the constant of a spring k=50 N/m and it's required to calculate the displacement Δx produced by a force of F=40 N. Solving for Δx:
[tex]\displaystyle \Delta x=\frac{F}{k}[/tex]
[tex]\displaystyle \Delta x=\frac{40}{50}[/tex]
Calculating:
[tex]\displaystyle \Delta x=0.8\ m[/tex]
The spring stretches or compresses 0.8 m (80 cm)
hi = L(1 – cos theta), theta = 40
Answer:A pendulum consists of a ball at the end of a massless string of length 1.4 m. The ball is released from rest with the string making an angle of 20 degrees with the vertical. What is the maximum speed of the pendulum?
Explanation: Have a great day and oh here is a little something to warn the great people. In the comments....
;)
Which of the following will result in the highest conductance?
large cross-sectional area, short pipe
small cross-sectional area, long pipe
small cross-sectional area, short pipe
large cross-sectional area, long pipe
Answer:
The highest conductance results from;
Large cross-sectional area, short pipe
Explanation:
The conductance, G, of a material is a measure of the rate or ease of electricity conduction of the material
[tex]The \ conductance \ G = Current/(Potential \ difference) = \dfrac{I}{V} =\dfrac{1}{R} = \dfrac{A}{\rho \cdot l}[/tex]
Where;
I = The current
V = The voltage (Potential difference)
R = The resistance
A = The cross-sectional area of the conductor
L = The length of the conductor
ρ = The resistivity of the conductor
Therefore, "G" is directly proportional to "A" ang "G" is inversely proportional to "l" from which we have that as the cross-sectional area increases the conductance increases and as the length of the pipe decreases the conductance increases.
The highest conductance is given by a large cross-sectional area and a short pipe.
Answer:
Large cross-sectional area, short pipe
Explanation:
If the captain of a ship observes that the star Polaris is 15° above the horizon, what is this ship's latitude?
A. 75° north
B. 15° north
C. 30° north
D. Unable to determine based on the information given
For what reason Do meteorogists use isobars on a weather map
Answer:
Isobars are similar to height lines on a geographical map, and they are drawn so that they can never cross each other. Meteorologists use isobars on weather maps to depict atmospheric pressure changes over an area and to make predictions concerning wind flow.
Explanation:
Answer:Isobars are similar to height lines on a geographical map, and they are drawn so that they can never cross each other.
Explanation:
A hot drink in a room is at a temperature of 20 C
What has happened to the drink after 10 minutes?
Answer: the drink cooled down to the same temperature as the room it was in.
Explanation: due to the change and temperature of the room, it cause the heat particles to exchange, causing it cool
A bicycle pump contains 20 cm3 of air at a pressure of 100 kPa. The air is then pumped in a tyre of volume 100 cm3. Calculate the pressure of the air in the tyre. Assume that the temperature is fixed.
Answer:
The pressure of the air in the tyre is 20 kPa
Explanation:
The parameters for the bicycle pump and tyre are;
The volume of air contained in the bicycle pump, V₁ = 20 cm³
The pressure of the air contained in the bicycle pump, P₁ = 100 kPa
The volume (available) of the tyre, where the air is pumped, V₂ = 100 cm³
Let P₂ represent the pressure in the tyre after the air is pumped
By Boyle's law, we have that at constant temperature, the volume of a given mass of gas is inversely proportional to its pressure;
Mathematically, Boyle's law gives the following equation;
P₁ × V₁ = P₂ × V₂
∴ P₂ = (P₁ × V₁)/V₂
Substituting the known values gives;
P₂ = (100 kPa × 20 cm³)/(100 cm³)
∴ P₂ = 100 kPa × 1/5 = 20 kPa
P₂ = 20 kPa
The pressure of the air in the tyre = P₂ = 20 kPa.
A liquid of low viscosity _____.
flows quickly
has a definite shape
flows slowly
fills its container
Answer:
flows quickly
Jin is standing still and watching an archer on a horse traveling away from a target. The archer is moving at a speed of 4 m/s and shoots the arrow toward the target with a speed of 17 m/s. Which statement is supported by this scenario?
-For Jin, the speed of the arrow is 21 m/s, and for the archer, the speed of the arrow is 4 m/s.
-For Jin, the speed of the arrow is 13 m/s, and for the archer, the speed of the arrow is 17 m/s.
-For both Jin and the archer, the speed of the arrow is 21 m/s.
-For both Jin and the archer, the speed of the arrow is 17 m/s.
Answer:
For Jin, the speed of the arrow is 13 m/s, and for the archer, the speed of the arrow is 17 m/s.
Explanation:
EDGE2020 :)
B
Answer:
B.
Explanation:
Edge 2021
Fill in the blank for the following statement: Physical weathering is the ________.
Answer:
Breakdown of rocks
Hope this helps :)
Answer:
Disintegration of rocks without chemical change.
Explain why a trapped gas in black box left in the sun will reach a higher temperature than the surroundings
Answer:
because the gas within the black box will absorb more heat than that in the surrounding
Explanation:
this is because the black color has a tendency of absorbing heat
Light waves are:
O Transverse waves
O Longitudinal Waves
Answer:
They are Transverse Waves.
Answer: Transverse waves
A car is driving on the road. The car starts to decelerate at -3 m/s2. It stops moving after 125
meters. How fast was the car going initially?
Answer:
27.39 m/s
Explanation:
From the question given above, the following data were obtained:
Deceleration (a) = –3 m/s²
Distance (s) = 125 m
Final velocity (v) = 0 m/s
Initial velocity (u) =?
The initial velocity (u) of the car can be obtained as follow:
v² = u² + 2as
0² = u² + (2 × –3 × 125)
0 = u² + (– 750)
0 = u² – 750
Collect like terms
0 + 750 = u²
750 = u²
Take the square root of both side
u = √750
u = 27.39 m/s
Thus, the initial velocity of the car was 27.39 m/s
A beam of light of wavelength lambda = 541nm is normally incident on a diffraction grating which has 600 lines m * m ^ - 1 Determine the angle theta 2 at which the second order diffracted beam is seen.
Answer:
Angle of diffraction for second order maxima is θ = 18.941°
Explanation:
From the question it is given that
wavelength of incident light = λ = 541 nm = 541 x [tex]10^-^9 m[/tex]
order of maxima = n =2
diffraction grating has 600 lines per mm
⇒ distance between two slit is [tex]\frac{1mm}{600}[/tex] = 1.66 x [tex]10^-^6[/tex] m
using the relation of Braggs diffraction formula i.e.,
2dsinθ = nλ ..................................(1)
where, d = distance between two lines of grating
θ is the angle of diffraction
n= order of maxima
λ is the intensity of incident photon
on substituting the respected values in relation (1) we get,
2 x 1.66 x [tex]10^-^6[/tex]m sinθ = 2 x 541 x [tex]10^-^9 m[/tex]
⇒ sinθ = 0.3246
⇒ θ = [tex]sin^-^1(0.3246)[/tex] = 18.941 °
What happens first when a star begins to run out of fuel?
The star’s core shrinks.
The star becomes a black hole.
The star becomes a white dwarf.
The star’s outer layer drifts away.
The star’s core shrinks, this happens first when a star begins to run out of fuel. Hence option A is correct.
What is star ?A star is a type of celestial object that consists of a bright spheroid of plasma kept together by self-gravity. The Sun is the closest star to Earth. Many other stars can be seen with the open eye at night, but due to their great distances from Earth, they appear as fixed points of light. Many of the brightest stars have proper names, and the most prominent stars have been classified into constellations and asterisms. Astronomers have put together star catalogues that identify known stars and offer conventional stellar designations. An estimated 1022 to 1024 stars exist in the visible cosmos. Only about 4,000 of these stars can be seen with the open eye, and they are all located within the Milky Way galaxy.
Hence option A is correct.
To know more about Star :
https://brainly.com/question/31258649
#SPJ5.
Help me with this question please
Answer:
Its true i'm pretty sure
Explanation:
Answer:
The answer is True
Explanation:
because it is and I suck at explaining
why is it possible for iron ships to float o water,but needles sink when dropped in water
Explanation:
Needles sinks in water due to the more density of needles than the density of water. But ship is made hollow and contains air. So it's average density Is less than that of water. It displaces the liquid of it's own weight causing the ship to float on water.
So, it it possible for iron ships to float on water,but needles sink when dropped in water.
Hope it will help :)❤
A car is traveling at 21m/s. It accelerates at 1.4m/s2 for 11s. How fast is the car moving after the acceleration?
Answer:
v=u+at
v=21+1.4(11)
v=21+15.4
v=36.4
help i need an explanation
Answer:
125.44 N
Explanation:
From the question given above, the following data were obtained:
Weight on earth = 784 N
Acceleration due to gravity of the moon (gₘ) = 1.6 m/s²
Weight on moon =?
Next, we shall determine the mass of the person. This can be obtained as follow:
Weight on earth (Wₑ) = 784 N
Acceleration due to gravity of earth (gₑ) = 10 m/s²
Mass (m) =?
Wₑ = m × gₑ
784 = mass × 10
Divide both side by 10
Mass = 784 / 10
Mass = 78.4 Kg
Finally, we shall determine the weight of the person on moon. This can be obtained as follow:
Mass (m) = constant = 78.4 Kg
Acceleration due to gravity of the moon (gₘ) = 1.6 m/s²
Weight on moon (Wₘ) =?
Wₘ = m × gₘ
Wₘ = 78.4 × 1.6
Wₘ = 125.44 N
Therefore, the weight of the person on moon is 125.44 N.
a moving truck takes a much longer time to stop than that taken by a car when brakes are pressed at the same time
The magnitude of inertia depends on the mass of the body.
What is inertia?The term inertia has to do with the degree of resistance to motion. We know that an object will continue in its state of rest or uniform motion unless it is acted upon by an external force.
The magnitude of inertia depends on the mass of the body. Since the truck is more massive than the car, it follows that a moving truck takes a much longer time to stop than that taken by a car when brakes are pressed at the same time.
Learn more about inertia:https://brainly.com/question/3268780
#SPJ1
A 13.3 kg box sliding across the ground
decelerates at 2.42 m/s2. What is the
coefficient of kinetic friction?
(No unit)
Answer:
0.25
Explanation:
According to newtons law of motion
\sum F_x = ma
F_f = ma
nR = ma
nmg = ma
ng = a
n = a/g
g is the acceleration due to gravity
Given
a = 2.42m/s²
g = 9.8m/s²
Substitute into the formula;
n = 2.42/9.8
n = 0.25
Hence the coefficient of kinetic friction is 0.25
Answer:
0.247
Explanation:
I had the same question and this is the correct answer.
Which competition is the “ most important soccer competition in the world “ ?
a - National championship
b - World Cup
c - olympics
Which of the following is an interaction in which one organism benefits and the other is harmed (+/-)?
parasitism
mutualism
competition
commensalism
please help me
Answer:
Commensalism
Explanation:
Trust Me
The symbiotic relationship in which one organism benefits and the other is harmed (+/-) is called parasitism. For example, infectious microbes living in our body.
What is parasitism ?The long term relationship between two different kind of living organism is called symbiosis. There are different types symbiotic relations namely, mutualism, commensalism, parasitism etc.
The interaction in which both organism gets helped by each other is called mutualism. For example, fid fruit and flies. If only one organism is helped by the interaction and the other is not affected is called commensalism.
symbiotic relationship in which one organism benefits and the other is harmed (+/-) is called parasitism. The organisms which make threat to the other by this interaction are called parasites.
Find more on symbiosis:
https://brainly.com/question/16248432
#SPJ6
If a roller coaster has 50,000 J of potential energy at the top of the first hill, how much kinetic energy does it have at the lowest point?
Answer:
50,000 J because of the transformation of energy
Explanation:
A bus is moving with an acceleration of 4 m/s^2. If it was initially at rest,
what will be its speed at the end of 2 seconds? *
a) 8 m/s
b) 6 m/s
c) 2 m/s
d) 0.5 m/s