Answer:
C
Explanation:
Cool and dense air falls through more warm and less dense air during convection. The cooler, which is much heavier than warm air, is displacing the warmer, which has less mass. Convection always involves rising air in the atmosphere.
Answer:
C
Explanation:
Imagine a kettle. When you open it, all the hot water vapour will rise up, attempting to burst out. However, when it comes in contact with the cold air, it also becomes cold, causing it to sink back down and giving us the visual effect of steam.
What is the Einstein Rosen Bridge Theory? Is it possible why or why not? (IN YOUR OWN WORDS ANYTHING ELSE WILL BE DELETED)
That states that the blackhole ends are working like bridges between one space to another.
And you can travel through them in 5-10s The distance is thousands of lightyears but we can travel it..This may be possible
An object weighing 75 N is dropped from the top of a building and falls a distance of 28 m to the ground. How much work does gravity do on the object from the time it is dropped to the time it hits the ground?
Determine the CM of the uniform thin L-shaped construction brace shown in (Figure 1) . Suppose that a = 2.20 m and b = 1.63 m Determine the x coordinate of the CM
By weighted average method, the x-coordinates of the center of mass of the compound figure, the uniform thin L-shaped construction brace is [tex]\bar x = \frac{1.10\cdot m_{A}+2.10\cdot m_{B}}{m_{A}+m_{B}}[/tex] meters.
How to determine the coordinates of the center of mass of a compound figure
Let suppose that the entire construction has a uniform mass, then the coordinates of the center of mass can be determined by definition of weighted average:
[tex]\bar x = \frac{\sum \limits_{i = 1}^{n}x_{i}\cdot m_{i}}{\sum \limits_{i=1}^{n}m_{i}}[/tex] (1)
[tex]\bar y = \frac{\sum \limits_{i = 1}^{n}y_{i}\cdot m_{i}}{\sum \limits_{i=1}^{n}m_{i}}[/tex] (2)
If we know that a = 2.20 m and b = 1.63 m, then the x-coordinates of the center of mass of the compound figure is:
[tex]\bar x = \frac{1.10\cdot m_{A}+2.10\cdot m_{B}}{m_{A}+m_{B}}[/tex]
By weighted average method, the x-coordinates of the center of mass of the compound figure, the uniform thin L-shaped construction brace is [tex]\bar x = \frac{1.10\cdot m_{A}+2.10\cdot m_{B}}{m_{A}+m_{B}}[/tex] meters.
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Question 9
2 pts
At a stop light, a truck traveling at 15 m/s passes a car as it starts from rest. The truck travels at
constant velocity and the car accelerates at 3 m/s². How much time does the car take to catch up
to the truck?
O 15 s
O 10 s
05 s
O 25 s
20 s
the car take to catch up to the truck = same distance
d truck = d car
vt = vot+1/2 at² (vo=0, from rest)
vt = 1/2at²
15t=1.5t²
1.5t²-15t=0
t(1.5t-15)=0
t = 0 or
1.5t=15⇒ t=10 s
A 95kg fullback was running downfield at 8m/s. A defensive player (110kg) was running upfield at 6m/s straight at the fullback. What was the momentum of each player before they impacted?
A)Fullback: 760kgm/s, Defender: 660kgm/s
B)Fullback: 760kgm/s, Defender: -660kgm/s
C)Fullback: 570kgm/s, Defender: 880kgm/s
D) Fullback: 570kgm/s, Defender: -880kgm/s
A 95 kg fullback was running downfield at 8 m/s. A defensive player (110 kg) was running upfield at 6 m/s straight at the fullback. The momentum of each player before they impacted Fullback 760 kgm/s, Defender: 660 kgm/s.
What is impulse?In classical mechanics, the integral of a force, F, over the time period over which it acts, t, is referred to as the "impulse." Impulse is a vector quantity because force is one as well. When an item receives an impulse, it experiences an equivalent vector change in its linear momentum and also in the direction that results.
momentum = mass *velocity
momentum = 95*8 = 760 kg-m/sec Fullback
momentum = 110*6 = 660 kg-m/sec Defender
A 95 kg fullback was running downfield at 8 m/s. A defensive player (110 kg) was running upfield at 6 m/s straight at the fullback. The momentum of each player before they impacted Fullback 760 kgm/s, Defender: 660 kgm/s.
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Compare the level of energy of radio and microwaves when compared to other waves on the spectrum.
If the gravitational force disappeared , Earth would break away from its orbit and continue travelling in a ..............line into space.
Please help!! Look at pic
Answer:
Explanation:
Voltage and Current relation is given by V=IR
I=9A
R=4Ohm
V=IR
V=9x4=36Volts
Resistance = 4 Ohm
Current = 9 Ampere
Voltage = 36 Volts
The farther away you are from a light source, the _____ intense it appears
Answer:
The answer is Less.
Explanation:
The further you are away from a light source, the less intense the light appears.
Waves
Please need help fast
the only state of matter that is not a fluid is
Answer:
maybe the answer is solid state
(100 POINTS AND BRAINLIEST)
Atoms form chemical bonds using:
a. electrons in the innermost energy level
b. electrons in the outermost energy level
c. protons and electrons
Answer:
electron in the outermost
Explanation:
These are the electrons available for bonding or transfer
protons do are not involved in actual bonding
Answer:
b
Explanation:
Atoms form chemical bonds using electrons in the outermost energy level, otherwise known as valence electrons.
For atoms to bond, they must either gain or lose electrons.
By gaining electrons, the atom attains a negative charge.
By losing electrons, the atom attains a positive charge.
Above is an image of people waiting at the train station to get on the incoming train. As the train slows down to stop, is it accelerating? Why or why not?
The definition of acceleration states that an object accelerates when it______, ______, or changes.
what are the missing words?
Explanation:
Acceleration is a vector quantity which is defined as the rate at which an object changes its velocity
Venus and Earth may be regarded as behaving as black bodies. The mean temperature at the surface of Venus is about 600 K and at the surface of Earth is about 300 K. Which of the following is the best estimate for the ratio \frac{\text{power radiated per unit area on Earth}}{\text{power radiated per unit area onVenus}} power radiated per unit area onVenus power radiated per unit area on Earth
The best estimate for the ratio of Power radiated per unit Area on Earth and Power radiated per unit Area on Venus is 1/16. The correct option is D.
What is power radiated?Power radiated is directly proportional to the fourth power of Temperature at the surface and also to the cross-section area.
P = σ A T⁴
For 600 K at Venus, σ A T⁴ = σ A (600)⁴
For 300 K at Earth , σ A T⁴ = σ A (300)⁴
Comparing, we get
[σ A (300)⁴/ σ A (600)⁴ ] = 1/16
Thus, the the best estimate for the ratio is 1/16. The correct option is D.
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The horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 5.0 m/s. How fast is the block moving at the instant the spring has been compressed 15 cm? The spring constant k = 2000 N/m.
The block moving at instant the spring is compressed 15cm is √[(25m - 45)/m]
What is conservation of energy principle?When there is no external force acting on the system, the total mechanical energy remains conserved.
K.E i = K.E f + SPE
1/2 mu² =1/2 mv² + 1/2 kx²
Substitute u = 5m/s, k =2000N.m and x =0.15m, we get the final velocity
1/2 mu² =1/2 mv² + 1/2 kx²
v =√[(25m - 45)/m]
Thus, the block moving at the instant the spring has been compressed 15 cm is √[(25m - 45)/m]
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A force of 400N acts on a body for time 10ms impulse will be
Answer:
4000Ns
Explanation:
I=F×T=400N×10ms
Before Schwarzschild, the understanding of relativity to gravitational force was unknown.
t or f
Answer:
False
Explanation:
Why is impulse and momentum important in sports like cricket??
==============================
[tex] \large \sf \underline{Question:}[/tex]
Why is impulse and momentum important in sports like cricket??==============================
[tex] \large \sf \underline{Answer:}[/tex]
Impulse and momentum are important in sports like cricket because from the word "momentum" it describe itself like you're getting used of it or you know what to do like there's no stopping you.
==============================
How are impulse and momentum related?
brainly.com/question/2193212brainly.com/question/904448==============================
Mr. McSparin can walk one mile in 0.25 hours. Calculate his velocity.
Answer:
4 mph
Explanation:
velocity = miles divided by time = miles/time
= 1 mile / .25 hr = 4 mph
Scientists use equations to model how fast a rocket needs to go to launch a satellite into orbit. What is a limitation of this model?
A limitation of this model is that it can't be tested practically in order to check its validity.
What is a model?Models are representations of scientific data that can help in defining, analyzing, and communicating many concepts. These models are developed in order to do analysis, specification, design, verification, and validation of a system.
So we can conclude that a limitation of this model is that it can't be tested practically in order to check its validity.
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3. A bottle of vitamin C contains 100 tablets and weighs 80 g. If the
bottle alone weighs 23 g. (a) What is the mass of one tablet? (b) What is
the mass of 36 tablets? (c) What is the weight of 50 tablets?
Answer:
a
0.57g
b
20.52
c
28.5
Explanation:
a
The bottle weighs 80g with tablets
If the bottle alone weighs 23g, the tablets weigh 57g
100 tablets weigh 57g, 1 tablet weighs 0.57g
b
0.57g is one tablet, so to achieve 36 tablets we must multiply by 36
0.57 multiplied by 36 is 20.52
c
To find 50 tablets we can use the same method we used before or a slightly faster method
100 tablets is 57g, so all we have to do is halve to find 50
57 divided by 2 is 28.5
PLEASE ANSWER ASAP FOR 75 POINTS!!!!
λ = c : f
λ = 3 x 10⁸ : 1.05 x 10⁸
λ = 2.86 m
E = hf
h = Planck's constant (6.626.10⁻³⁴ Js)
E = 6.626.10⁻³⁴ x 2.86
E = 1.896 x 10⁻³³ J
λ = 3 x 10⁸ : 1.011 x 10⁸
λ = 2.97 m
E = hf
h = Planck's constant (6.626.10⁻³⁴ Js)
E = 6.626.10⁻³⁴ x 2.97
E = 1.97 x 10⁻³³ J
λ = 3 x 10⁸ : 1.05 x 10⁸
λ = 2.96 m
E = hf
h = Planck's constant (6.626.10⁻³⁴ Js)
E = 6.626.10⁻³⁴ x 2.96
E = 1.96 x 10⁻³³ J
7. What is the radius of an \alpha particle?
rxcuobudbbgvd CT I ng a ubjnr. hbgvw
What is the wavelength of radiation with a frequency of 1.50 x 1013 s-1
Answer:
[tex]2 \times 10^{-5}\ m[/tex]
Explanation:
[tex]v = f \lambda[/tex]
velocity of wave = frequency x wavelength
I'll assume we're talking about EM radiation here, which is any kind of light (microwave, ultraviolet, visible, etc.).
Every type of EM radiation has the same velocity — the speed of light.
Speed of light, known as [tex]c[/tex] — 300 000 000 = [tex]3 \times 10^8[/tex]
velocity: [tex]c = 3 \times 10^8[/tex] [tex]ms^{-1}[/tex]
frequency: [tex]f = 1.5 \times 10^{13}[/tex] [tex]\text{Hz}[/tex]
wavelength: [tex]\lambda =\ ?[/tex] [tex]m[/tex]
[tex]v = f \lambda\\3 \times 10^8 = 1.5 \times^{13}\ \times \ \lambda\\\text{rearrange for}\ \lambda\\\lambda = \frac{3 \times 10^8}{1.5 \times 10^{13}} = 2 \times 10^{-5}[/tex] [tex]m[/tex]

Which of the following is a physical change?
sawing a piece of wood in half
O burning a piece of wood
O a copper statue turning from red to green
Orust forming on an iron fence
Answer:
I think its 'sawing a piece of wood in half'
Explanation:
sry if its wrong
The diagram shows two liquid-in-glass thermometers.
Which has the greatest range? Explain how can you tell?
(Image attached)
Answer:
thermometer A
Explanation:
The range of a thermometer is the difference between the minimum and maximum temperatures that the thermometer can read.
∴ Range of thermometer A = 110° - (-10)° = 120°
Range of thermometer B = 50° - (-10)° = 60°
∴ Range of thermometer A is greatest.
Hope this helps!
As a pan is sitting on a stove it begins to heat up. Eventually it may get hot enough that it glows red, meaning it is radiating electromagnetic waves within the visible portion of the spectrum. What does this situation show us about electromagnetic radiation?
Electromagnetic radiation can only be emitted in the form of visible light.
The hotter an object is, the faster the electromagnetic radiation will travel.
The electromagnetic radiation emitted by an object is not affected by its temperature.
The hotter an object is, the greater the energy of the electromagnetic radiation in emits.
How much work would a child do while pulling 12kg wagon distance of 4.3m with a 22N force?
[tex]\huge{\color{red}{\fbox{\textsf{\textbf{Answer}}}}} [/tex]
94.6J
Explanation:
Force (F) = 22N
mass (m) = 12kg
distance (S) = 4.3m
While
[tex] \sf Work \: done = Force \times distance[/tex]
This means
W = FS
while mass has no role in equation
Now substituting the required values
[tex] \sf W = 4.3 \times 22 \\ \\ \sf W = 94.6J[/tex]
An object of mass 20 kg is raised vertically through a distance of 8 m above ground level. If g = 10 m/s2, what is the gravitational potential energy of this object at this position?
Answer:
1600 joules
Explanation:
Potential Energy = m * g * h
= 20 kg * 10 m/s^2 * 8 m = 1600 J
What distance does the car travel in the 3 seconds?
