Cause it's Corona Time
Which event is an example of vaporization?
O A. People see their breath on a cold winter day.
OB. A spilled drop of rubbing alcohol slowly disappears.
O C. Dew forms on the leaves of a tree.
O D. Fog forms in a valley.
Answer:
B
Explanation:
A spilled drop of rubbing alcohol slowly disappears is an example of evaporation. Hence, option B is correct.
What is Vaporization?The transformation of a substance into a gaseous (vapor) phase from a liquid or solid state. Boiling is the term for the vaporization process when conditions permit the creation of vapor bubbles within a liquid. A solid is instantly transformed into a vapor by the process of sublimation.
A solid or liquid must be heated to vaporize it. Insufficient heat from the environment may originate from the system itself in the form of a drop in temperature. The cohesive forces that hold the atoms or molecules of a liquid or solid together must be overcome to separate the atoms or molecules to produce the vapor, the heat of vaporization is a direct indicator of these forces.
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Suppose 128 radioactive atoms have a half-life of 15 seconds. Approximately how many radioactive atoms will be left after 60 seconds?
A. 32
B. 16
C.8
D. None
The amount of the radioactive atom that will be left after 60 seconds is 8 g.
The given parameters;
initial mass of the radioactive atom, N₀ = 128 ghalf-life of the radioactive atom, [tex]t_{1/2}[/tex] = 15 secondstime of the radioactive, t = 60 secondsThe amount of the radioactive atoms that will be left after 60 seconds is calculated as follows;
0 --------------------------------- 128 g
15 s ------------------------------ 64 g
30 s ----------------------------- 32 g
45 s ----------------------------- 16 g
60 s ------------------------------ 8 g
Thus, the amount of the radioactive atom that will be left after 60 seconds is 8 g.
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concave mirror ______the rays of light
Answer: A concave mirror focuses rays of light
Explanation:
State any 3 applications of capillary action
how do the dancer move while dancing
Answer:
The brain is controlling the movement and it’s called the nervous system
Explanation:
I took the test
A plane is landing. It started at 400m/s and ended up at 50m/s after 30 seconds. What is it's acceleration?
{middle school}
Give u = start velocity
v = end velocity
v = u + at
50 = 400 + a*30
30a = -350
a = -116.67 m/[tex]s^{2}[/tex]
**Why the accecleration is negative number**
Because displacement, velocity, and acceleration are VECTOR QUANTITIES.
Vector Quantity must have direction.
(03.05 LC)
Which of the following best describes the use of a renewable resource
Answer:
Option C or the third option.
Explanation: Water is a renewable resource there is so much of it and it just keeps circulating through the system it doesn't run out.
Answer:
c
Explanation:
Which of the following is a pair of vector quantities?
Answer:
velocity and displacement answer
Explanation:
thanks me
What is a small, rocky object that orbits the Sun and is usually found in a belt between Mars and Jupiter? asteroid comet meteor meteorite
Answer:
Asteroid
Explanation: did the test
Answer:
A. Asteroid
Explanation:
edge2020
2. The location of an object is called its
A. Direction
b. Position. C. Motion D. Displacement
The location of an object is called its Position, therefore the correct answer is option B.
What is displacement?An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard. Displacement describes this shift in location.
The indeterminate arrangement of axes used to describe an object's location and motion is known as a frame of reference. When describing the location of an item in relation to immovable objects located on Earth, we frequently use Earth as the frame of reference.
Any entity's precise coordinate or positioning, as determined by its fundamental dimensions or other factors, is known as its Actual Position. Position, thus, refers to how far your feature's location can deviate from its absolute position.
Thus, The location of an object is called its Position, therefore the correct answer is option B.
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A student walks 4 blocks east, 1 blocks north, 2 block west and then 1 blocks south in an hour. Her average velocity is?
Answer:
2 m/s
Explanation:
Given that a student walks 4 blocks east, 1 blocks north, 2 block west and then 1 blocks south in an hour.
The total time = 1 hour
The vertical displacement = 1 - 1
Vertical displacement = 0
Horizontal displacement = 4 - 2
Horizontal displacement = 2
Total displacement = sqrt (2^2 - 0^2)
Total Displacement = 2
Average velocity = displacement/time
average velocity = 2 / 1
Average velocity = 2 m/s
Therefore, her average velocity is 2 metres per second.
A baseball is thrown at a speed of 25 m/s and travels a distance of 100 m. How
far did it go?
You just said that it "... travels a distance of 100 m".
A 6.0 MeV alpha particle beam of cross section 5 cm2 is completely stopped in an ionization chamber producing a saturation current of 0.08 nA. What is the deBroglie wavelength of the alpha particle? If the energy necessary to create an ion-electron pair is 33 eV/ip, calculate the fluence rate?
Answer:
[tex]v=6.0MeV\\h=6.626\cdot10^{-34}\\dq=33\\[/tex]
Solution
[tex]m_\alpha =6.64\cdot 10^{-27}\\\lambda=\frac{h}{p}\\p=\sqrt{2m\cdot V}\\\lambda=\frac{6.628 \cdot10^{-34}}{\sqrt{2(6.64\cdot10^{-27})(6\cdot10^6)}}\\\\\lambda =2.35\cdot10^{-34}\\Fluence Rate =\frac{d(N)}{d(t)\cdot d(S)}=\frac{d(N)\cdot d(q)}{d(q)\cdot d(t)\cdot d(S)}=\frac{d(N)}{d(q)}\frac{V} {\cdot d(S)}\\\\\=\frac{6\cdot 10^6}{33} \cdot\frac{0.08\cdot10^{-9}}{4\cdot\pi\cdot25\cdot10^{-4}}\\\\=0.000463\\E_p=4.63\cdot10^{-4}\\[/tex]
[tex]=\frac{6*10^6\cdot 0.08*10^{-9}}{33\cdot4\pi\cdot 25*10^-4} \\\\E_P=4.63*10^{-4}[/tex]
Explanation:
First enlist all the variables
then solve using calculator
A motorcyclist is riding along a mountain trail that runs parallel to a road below. In fact the trail is 6 meters above the road. The motorcyclist then notices a flat bed truck directly below moving at the same speed and decides to drive off the trail, without changing speed. Fortunately, the motorcycle safely lands on the flatbed of the truck. What would the outcome have been if the trail was 12 meters above the road, but all other parameters remain the same?
The complete question reads:
A motorcyclist is riding along a mountain trail that runs parallel to a road below. In fact, the trail is 6 meters above the road. The motorcyclist then notices a flatbed truck directly below moving at the same speed and decides to drive off the trail, without changing speed. Fortunately, the motorcycle safely lands on the flatbed of the truck. What would the outcome have been if the trail was 12 meters above the road, but all other parameters remain the same?
a) The motorcycle would land slightly behind the truck.
b) The motorcycle would land in front of the truck.
c) The motorcycle would land on the flatbed of the truck as before.
d) The motorcycle would land several meters behind the truck
Answer:
c) The motorcycle would land on the flatbed of the truck as before.
Explanation:
Note that if the trail was 12 meters above the road, but all other parameters remain the same, it simply means that other parameters like the speed of both the motorcyclist and the flatbed truck are the same.
Also, remember we are told that the mountain trail runs parallel to the road below, thus, there is a greater likelihood that the motorcyclist who has a higher height (to his advantage) could land on the flatbed of the truck.
Why does refracting light bend when it enters a denser or less dense medium?
Answer: The light bends because light travels fast but it slows down in a denser medium. For example light refracts in water or it bends after passing through air. When light passes through air ( a less dense medium ) then through water ( a more dense medium ) the beam of light bends because light travels more slowly in a denser medium then it picks up its pace again once it passes. The density of the substance determines how much the light is refracted. I hope this makes sense and I hope this answered your question!! :)
HELPPPPPPP
What did a study by Strayer and Johnston (2001) regarding the effects of attention on driving conclude?
A.
Attention is not affected as long as one is using a hands-free phone.
B.
Driving and talking with friends in the car increases the chance of an accident.
C.
Driving and listening to the radio increases the chance of missing traffic signals.
D.
Driving and talking on any type of cell phone increases the chance of missing traffic signals.
Answer:
D.
Driving and talking on any type of cell phone increases the chance of missing traffic signals.
Explanation:
correct on edge2021
Answer:
the answer is d thank me later
Explanation:
Alex swims at an average 45 m/min. How far does he swim in 1 min 24 sec?
Answer:
63 m
Explanation:
45 m = 1 min = 60 sec
45m/60sec = 0.75m/s
1 min 24 seconds = 84 sec
0.75m/s x 84 sec = 63 m
Which of the following would be an example of a vector? *
An object with a mass of 15 kg
An car moving at 30 m/s
A person running 5 m/s north
A spring with 16 J of energy
Answer:
A person running 5m/s north
While looking at an article about energy resources, you notice a bulleted list
with the title "Pros and Cons." This tells you that the article will present both
sides of the issue. Which active reading strategy are you using?
A. Using text features and visual cues
B. Making mental images
C. Monitoring and applying fix-up strategies
D. Summarizing
Answer:
A
Explanation:
When was that last time you cried ? You can tell me
Answer:
honestly i cant remember now. i think when i was stressed about school and how it destroyed my summer schedule
Fossil fuels has been used more in the existing world. Why?
Answer:
fossil fuels are being used more because fossil fuels are of great importance because they can burn to produce a significant amount of energy per unit mass the use of coal as a fuel prefates recorded history.
Explanation:
Hope this helps! :)
Air pollutants often cause irritation in the _____
system.
help
Jerry pushes against a solid brick wall as hard as he can, with a force of 500 N. How much work does he do on the wall?
Explanation:
work = 0
Work is zero because it remains in its place x=0
the product of m1m2 in the formula for gravitational force is always
negative, because the product of two positive numbers is negative.
positive, because the product of two positive numbers is positive.
positive, because the product of two negative numbers is positive.
negative, because the product of two negative numbers is negative.
Answer:
The correct answer is the second option
Explanation:
The formula in question (for gravitational force) is provided below
F = G.m₁.m₂/r²
Where
F = force of gravity
G = gravity constant (6.674 × 10⁻¹¹ m.kg⁻¹.s⁻²)
m₁ and m₂ = are the masses of the objects
r² = distance between the centers of the two objects
From the above, it can be deduced that m₁ and m₂ are masses and hence can only be positive. Positives multiplied together only gives positive, thus the second option is correct.
Which statement describes a question that can be answered by a scientific
investigation?
A. It is a question that can be answered by gathering other scientists'
opinions.
B. It is a question that can be answered by gathering data during an
experiment.
C. It is a question about a phenomenon of which no measurements
can be taken.
D. It is a question about the sequence of experimental steps.
Answer:
Its b
Explanation:
I just did this question
The question that can be answered by scientific investigation is that can be answered by gathering data during an experiment. Thus option B is correct.
What is scientific investigation?Investigation on a natural phenomenon or process to solve a scientific question or to solve a social or environmental issue by well designed experiments based on reasonable observations is called scientific investigation.
A scientific investigation includes, variables, hypothesis , observations, research methodology. Scientific experiments have to well designed to address all the outcomes of the observations and must be feasible to prove whether the hypothesis is true or not.
Scientific investigations cannot be conducted based on only opinions from scientists or scientific record. The data have to be collected through experiments conducted by well designed research methodology.
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PLEASE HELP :/
george walks to a friend's house. he walks 750 meters north, then realizes he walked too far he turns and walks 250 meters south. the entire walk takes him 50 seconds whats his distance and displacement?
As U asked this question twice sry not twice 4 times.. I have been answered the question..Just look there..
TqIf two groups in the game are exerting unequal and opposite forces on the
ground, will the rope move?
Answer:
Yes I think...
Explanation:
The net force on the rope will not be zero, thereby causing the rope to move in the direction of the greater force.
The resultant or net force between two opposing forces can be determined by Newton's second law of motion.
Let the force applied by the first group = F₁ = 10 NLet the opposite force applied by second group = F₂ = - 5NThese two forces are unequal and also opposite in direction.The resultant or net force exerted on the rope by the groups is calculated as;
[tex]\Sigma F_x = F_1 + F_2\\\\\Sigma F_x = 10 + (-5)\\\\\Sigma F_x = = 5 \ N[/tex]
Since the net force on the rope is not zero, it will move in the direction of the greater force.
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I will give brainlyist
PLZ HURRY!!!!!!!
Which of the following statements is true?
Heat can travel through a vacuum.
Heat has shorter wavelengths than visible light.
:)
∫·ω·∫
Answer:
I honestly think both of them are true
Answer:
Heat has shorter wavelengths than visible light.
Explanation:
(I had the same question)
I looked up the first one and it was wrong, and the missing options are incorrect. So It would not be all of the above. So, using process of elimination, "Heat has shorter wavelengths than visible light" is correct.
I PROMISE this is correct
What is the only way to let your body recover from overtraining? A. Take vitamins B. Rest for several days C. Eat a lot of protein D. Drink energy drinks
The only to recover from overtraining is to take rest for several days.
Overtraining makes the body to feel weak and tired.
What is overtraining and how to recover from overtraining?If the person or a sportsman work more hours or trains continuously without taking rest is known as overtraining. If the people who are taking much time of training they feel week and very tired. Their weakness will get reflect in their performance as poor, health conditions will get very low, mental health will also get affected.
To recover from overtraining they need to take more rest, must take all the medications to promote their health for every single day. To avoid overtraining must lookup and watch the health conditions, mental thought and their values on balanced life.
So, taking rest for several days made to recover from overtraining.
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Jerome is learning how the model of the atom has changed over time as new evidence was gathered. He has images of four models of the atom, but they are not in the correct order.
An image at left labeled W with overlapping red and blue balls in the center with a circular fuzzy green cloud outside them. An image at center left labeled X with a purple ball in the center surrounded by overlapping concentric black ovals, each with a small green ball on each of the 6 ovals. An image at center right labeled Y with a large black cross in a purple circle with a black line around the purple, with 10 small green balls dispersed within the purple circle. An image at right labeled Z with a purple center outlined in black with two concentric black circles around the center, the inner circle having 2 small green balls on it and the outer circle having 8 small green balls on it.
In what order should Jerome put these models to show the development from the earliest model of the atom to the most recent one?
Y, X, Z, W
Y, Z, W, X
W, Z, X, Y
W, Y, Z, X
Answer:
Y, X, Z, W
Explanation:
You know W is the most recent because it features the nucleus in the middle and the electron cloud which was shown in models after the others.
Answer:
the answer is A. Y, X, Z, W
Explanation:
