Answer:
true
Explanation:
you need to eliminate all unreal outcomes
Suppose that the half-life of an element is 1000 years. How many half-lives will it take before one-eighth of the original sample remains?
8
125
12.5
3
Answer:
3
Explanation:
The half-life of a radioactive isotope is the time it takes for the mass of the sample to halve.
This can be rewritten as follows:
[tex]m(t) = m_0 (\frac{1}{2})^n[/tex]
where
m(t) is the mass of the sample at time t
m0 is the original mass of the sample
n is the number of half-lives that passed
We see that if we take n=3, the amount of original sample left is
[tex]m(t) = m_0 (\frac{1}{2})^3 = m_0 (\frac{1}{8})[/tex]
So 3 (3 half-lives) is the correct answer.
Answer:
the answer is 3
Explanation:
Which of the following is a measure of the amount of light a star directly emits?
A. Luminosity B. Intensity C. Wavelength D. Brightness
Luminosity is the amount of light a star directly emits from its surface.
Luminosity is a measure of the amount of light a star directly emits.
Answer : Option A
Explanation:
Light intensity is similar to brightness of the light where it is a measure of amount of light focused with respect to area and its unit is called as lux represented by lx.
Different light has different wavelengths according to the electromagnetic spectrum. Luminosity is the best option from the given ones as is a measure of amount of light emitted from an object which is here referred to a star.
what is the distance moved by a particle moving along x axis if it starts from x=-7m goes upto x= -12m turns and stops at x=+34m? also calculate the net displacement
Answer: Trajectory=51m
Displacement=41m
Explanation:
Let's begin by stating clear that movement is the change of position of a body at a certain time. So, during this movement, the body will have a trajectory and a displacement, being both different:
The trajectory is the path followed by the body (is a scalar magnitude).
The displacement is the distance in a straight line between the initial and final position (is a vector magnitude).
According to this, in the description of the object placed at x= -7m on a number line and moving some 12m to the left and then to the right, stopping at x=34m; we are talking about the path followed by the object, hence its trajectory. So, 51 m is its trajectory.
But, if we talk about displacement, we have to draw a straight line between the initial position of the object (x=-7m) to its final position (x=+34m).
Now, being this an unidimensional problem, the displacement vector for this object is 41m.
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a television of mass 15 kg sits on a table the coefficient of static friction between the table and the television is 0.35 what is the minimum applied force that will cause the television to slide?
a. 79 n
b. 38 n
c. 147 n
d. 51 n
D. 51 N. The minimum applied force that will cause the television slide is 51 N.
In order to solve this problem we have to use the force of static friction equation Fs = μs*n, where μs is the coefficient of static friction, and n is the normal force m*g.
With μs = 0.35, and n = 15kg*9.8m/s² = 147 N
Fs = (0.35)(147 N)
Fs = 51.45 N
Fs ≅ 51 N
The answer is D) 51 N
mackinzie walks 4 blocks west, then 2 blocks south, then 4 blocks east, and, finally, 1 block south. what is the magnitude of her total displacement (in blocks)?
the magnitude of her total displacement in blocks is 3.
Answer:
3 blocks towards south
Explanation:
Displacement is the shortest distance between the final position and initial position.
Initially mackinzie moves 4 blocks west, then 2 blocks south, the 4 blocks east and then 1 block south. Net displacement in East-west direction = 4 - 4 = 0.
In North South direction, net displacement = 2+1 = 3 blocks towards south
Select all that apply
What are some basic resources a family is expected to provide for children?
education
clothes
spending money
food
shelter
vacations
Answer:
education
clothes
food
shelter
Explanation:
Answer:
1. education
2. clothes
3. food
4. shelter
Explanation:
The correct answers are basic needs that children should be provided. However, spending money and vacations are just privileges, not mandatory.
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The summer is caused by __________.
A) direct sunlight striking Earth
B) indirect sunlight striking Earth
C) Earth's closeness to the sun
D) Earth's far distance from the sun
Answer:
A) direct sunlight striking Earth
Explanation:
The summer is caused by direct sunlight striking Earth.
Answer:
A) direct sunlight striking Earth
Explanation:
Think about why there are seasons.
Here is proof that my answer is correct:
2 FULLS
What is the term given to vectors that don't lie in a straight line but instead
point in different directions?
A. One-dimensional
B. Resultants
C. Two-dimensional
D. Displacements
Answer:
Two vectors not lying in the same line and pointing in different direction
C. Two-dimensional
Explanation:
One-Dimensional vectors will point in a single direction only. There magnitude will simply add up.
In case of opposite directions, both the vectors must be lying on a straight line. There magnitude will be subtracted from each other,
Two dimensional vectors are quantities with magnitude and direction and they are represented by two components, x and y.
So, vectors which are not in a straight line and point in different directions are called Two-dimensional vectors.
Suppose the tourist in question #1 instead threw the rock with an initial velocity of 8.0
m/s (down). Determine the velocity and displacement of the rock at 4.0 s (Remember
the v; is down and must become a -8.0 m/s)
Answer:
Explanation:u=8m/s, a=8m/s*s, t=4s
Using v= u + at
v=8+-8*4
v=-24m/s
Displacement=s
Using s=½(u+v)t
s=½(8-24)4
s=½*-16*4
s=-8*4
s=32m( you can solve without observing the negative sign)
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PLEASE HELP ME IN SOLVING THIS QUESTION
Let Vb = the velocity of the boat.
Vw = the velocity of the flow of the stream.
X = the distance the boat traveled downstream.
So X = (Vb+Vw)T
After turning, the boat takes t time to get back to the float.
Then x -l = (Vb-Vw)t
and l = Vw * (T+t)
Replacing the equations for their variables you get (Vb+Vw)T-Vw(T+t) = (Vb-Vw)t
Simlify to: Vw = l/T+t = l/2T
Now using the values in the problem:
Vw = 12km / 2 * 60 = 12 km / 2hrs = 6km
The answer is 1. 6 km h^-1
Answer:
Hope it can help you and mark me as a brainlist....
An object at rest requires a force of 15 Newtons to set it into motion
Answer:
The force that required an object to move is greater than friction force. The opposite force for an object in motion is the friction force (assuming that the surface where the object lies is rough as most real objects are). This force is needed to be overcome to set the object to motion.
Explanation:
wich factors affect the electrical force between two objects?
Answer:
The strength of the charge and the distance between the two bodies.
Explanation:
According to coulombs law, electrical force is calculated as follows:
F = k (Q1 ×Q2)/ d²
where Q1 and Q2 represents the amount of charge between the two bodies while d is the distance between then.
This means the electrical force is directly proportional to the electrical charge of the bodies and inversely proportional to the square of the distance between them.
Bodies with high amounts charges will have stronger electrical forces between them than bodies with less electrical charges.
Charged bodies near each other will have stronger electrical forces between them than bodies far apart.
An athlete performing a long jump leaves the ground at a 27.0 degree angle and lands 7.80m away. What was the takeoff speed?
Answer:
=9.72 m/s
Explanation:
From the Newton's laws of motion;
x=2(v²cos∅sin∅)/g
Using geometry we see that 2 cos∅sin∅ = sin 2∅
Therefore, x= (v²sin 2∅)g, where v is the take off speed x the range and ∅ the launch angle.
Making v the subject of the formula we obtain the following equation.
v=√{xg /(sin 2∅)}
x=7.80
∅=27.0
v=√{7.8×9.8/sin(27×2)}
v=√94.485
v=9.72 m/s
To find the takeoff speed of an athlete performing a long jump, we can use the principles of projectile motion.
Explanation:To calculate the takeoff speed of an athlete performing a long jump, we can use the principles of projectile motion. Since the jump is treated as a projectile, we can break down the motion into horizontal and vertical components.
First, we need to find the vertical component of the takeoff speed. We know that the jumper leaves the ground at a 27.0 degree angle and lands 7.80m away. The vertical displacement can be calculated using the equation:
Δy = v0y * t - (1/2) * g * t^2
The horizontal component of the takeoff speed can be found using the equation:
Δx = v0x * t
By combining these two equations and solving for the takeoff speed, we can determine the answer.
Which lists the organs in the correct order as food passes from the mouth to anus?
Answer:
The digestive process:
Mouth
Esophagus
Stomach
Small intestine
Pancreas
Liver
Large intestine
Explanation:
The digestive system is made up of the GI tract or digestive tract—and the liver, pancreas, and gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.
Final answer:
The correct order of the digestive organs as food passes from the mouth to the anus is mouth, esophagus, stomach, small intestine, large intestine, rectum, and anus. Accessory organs aid digestion but do not directly contact food.
Explanation:
The digestive system includes several major organs through which food travels from the mouth to the anus. To answer both review questions provided, here is the correct sequence of the digestive organs along the gastrointestinal tract, starting with the mouth:
MouthEsophagusStomachSmall IntestineLarge Intestine (also known as the colon)RectumAnusIn addition to these organs directly involved in the passage of food, there are accessory organs such as the salivary glands, pancreas, liver, and gallbladder that play crucial roles in digestion. These accessory organs assist in breaking down food through the secretion of enzymes and other digestive juices, but do not come into direct contact with the food within the GI tract.
Which best explains what happens when an electron moves from an excited state to the ground state?
O
O
O
O
The electron absorbs energy as it moves to a lower energy level.
The electron absorbs energy as it moves to a higher energy level.
The electron releases energy as it moves to a higher energy level
The electron releases energy as it moves to a lower energy level.
Answer:
The electron releases energy as it moves to a lower energy level.- last choice
An "excited state" is a condition where the electron has MORE energy. The "ground state" is the lowest energy level, where the electron has the minimum possible energy.
So, when an electron moves from an excited state to the ground state, it loses energy. The electron releases energy as it moves to the lowest energy level.
(last choice)
Which statement about covalent bonds is true
Answer:c
Explanation:
i did the usatestprep
Which circuit is a series circuit ?? plz help
In a series circuit, all of the components are connected in the same 'loop' and the current only has one direction/path it can flow through.
In the first three options, the current has multiple paths it can go through. So these three circuits are parallel and not series.
In the last option, the current only has one path where it can flow through, so that circuit is in series.
So Circuit D is a series circuit.
----------------------------------------
Answer
Circuit D
Answer:the last one
Explanation:in a series circuit, only one current flows through it. i.e it connected by a single wire
A cup of water with holes cut in the bottom will leak because the water is
heavier than the cup.
O A. True
O B. False
Answer:
Salutation
Explanation:
This statement would be incorrect see because water would drip through a cup no matter how heavy because its a liquid and with it having no natural shape it can squeeze through the holes of the cup
The given statement is false.
The water will leak through the holes in bottom not because it is heavier than the cup but because for the reason it is a liquid.
Explanation:
The water is a liquid with a standard viscosity, even with lighter viscosity or heavy viscosity, it will eventually leak out of the cup with the hole in the bottom as the liquid holds the shape of the container unlike solid and thus with hole, leaks out.
what does SI stand for,when referring to a system of measurement
si = system international
Answer:
SI stands for International system of units
Explanation:
The SI system, is used around the world to remove bias and inequality of measured values. This made it possible to achieve unified measurements of quantities anywhere in the world by various conversion process. The seven basic SI units are: kilogram (kg), meter (m), second (s), kelvin (K), ampere (A), mole (mol), and candela (cd).
Which of the following is most likely to be the best conductor of electricity?
oxygen
chlorine
aluminum
chromium
Answer:
I think its oxygen, a conductor is something that allows heat very easily.
Explanation:
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help meeee pleaseeee
Carbonation, Hydrolysis and Oxidation all relates to chemical reactions with the rocks - so these are forms of Chemical weathering
Frost wedging is where the rocks and earth is broken apart by water freezing and turning to ice. It has nothing to do with rocks themselves changing in their chemical composition. So this is a type of physical weathering.
------------------------------------------------------
Answer:
Frost wedging is a type of physical weathering.
Hydrolysis, oxidation and carbonation are all under chemical weathering
Therefore; frost wedging is a type of physical weathering
if 10 calories of energy are added to 2 grams of ice at -30°C, calculate the final temperature of the ice.
Answer:
= -20°C
Explanation:
The specific heat capacity of ice using the cgs system is 0.5cal/g°C
The enthalpy change is calculated as follows
ΔH=MC∅ where M represents mass C represents specific heat and ∅ represents the temperature change.
10cal = 2g×0.5cal/g°C×∅
∅=10cal/(2g×0.5cal/g°C)
∅=10°C
Final temperature= -30°C+ 10°C= -20°C
Answer:
-20 C
Explanation:
simplifying fractions
30 over 54
Answer:
5/9
Explanation:
First, find a common factor for 30 and 54.
30 and 54 can both be divided by 2.
30 divided by 2 = 15
54 divided by 2 = 27
So, your new fraction is 15/27.
However, don't stop there.
15 and 27 can both be divided by 3 as well.
15 divided by 3 = 5
27 divided by 3 = 9
So, your final answer is 5/9.
I hope this helps! :)
Answer:
5/9
Explanation:
Two billiard balls move toward each other on a table. The mass of the number three ball, m1, is 5 g with a velocity of 3 m/s. The mass of the eight ball, m2, is 6 g with a velocity of 1 m/s. After the balls collide, they bounce off each other. The number three ball moves off with a velocity of 5 m/s. What is the final velocity and direction of the eight ball? +8.6 m/s +5.7 m/s –5.7 m/s –8.6 m/s.?
Answer:
+5.7 m/s
Explanation:
According to the law of conservation of momentum is that the momentum before the collision is equal to the momentum after the collision. In an equation form it would look like this:
M₁V₁+M₂V₂ = M₁V₁'+M₂V₂'
Where:
M₁ = mass of object 1 (kg)
V₁ = velocity of object 1 before the collision (m/s)
V₁' = Final velocity of object 1 after the collision (m/s)
M₂ = mass of object 2 (kg)
V₂ = velocity of object 2 before the collision (m/s)
V₂' = Final velocity of object 2 after the collision (m/s)
According to your problem you have the following given:
M₁ = 5 g = 0.005kg
V₁ = 3 m/s
V₁' = -5m/s (It bounced off so it is going the other direction)
M₂ = 6g = 0.006kg
V₂ = -1 m/s (It is coming from the opposite direction of the 3-ball)
V₂' = ?
So we plug in what we know and solve for what we don't know.
[tex]M_1V_1+M_2V_2 = M_1V_1' + M_2V_2'\\\\(0.005kg)(3m/s)+(0.006kg)(-1m/s) = (0.005kg)(5m/s)+(0.006kg)(V_2')\\\\(0.015kg\cdot m/s)+(-0.006kg\cdot m/s)=(-0.025kg\cdot m/s)+(0.006kg)(V_2')\\\\0.009kg\cdot m/s+0.025kg\cdot m/s = (0.006kg)(V_2')\\\\\dfrac{0.034kg\cdot m/s}{0.006kg} = V_2'\\\\5.7m/s = V_2'[/tex]
Answer:
+5.7 m/s
Explanation:
Just did the assignment :)
A 26 cm object is 18 cm in front of a plane mirror. A ray of light strikes the object and is reflected off the mirror at a 42-degree angle. What is the angle of reflection? degrees What type of image is formed? What is the size of the image? cm
Answer:
42 degrees, virtual image, same size as the object (26 cm)
Explanation:
The law of reflection states that:
- When a ray of light is incident on a flat surface (such as the plane mirror), the angle of reflection is equal to the angle of incidence
So, since in this case the angle of incidence is 42 degrees, the angle of reflection is also 42 degrees.
Moreover, the image formed by a plane mirror is always:
- Virtual (on the same side as the object)
- The same size as the object
So in this case, since the object's size is 26 cm, the image's size is also 26 cm.
42 degrees
virtual
26 cm
Why can light travel through outer space, but sound cannot?
Answer: Sound has vibrations of molecules and it spread through the air
Explanation: Pretty much what this means you need molecules to produce sounds and in space there isn't any. On the other hand light is a electromagnetic waves and those waves do not need a medium to travel through
Light can travel through outer space, unlike sound, because light is composed of electromagnetic waves that don't need a medium to propagate. In contrast, sound waves are mechanical and require a medium to travel through, which is absent in the vacuum of outer space.
Explanation:The reason light can travel through outer space, but sound cannot is due to the type of waves these two are and what they require to propagate. Light is composed of electromagnetic waves, which are generated by charged particles and do not require a medium to propagate. This quality allows light to travel in a vacuum, such as outer space.
On the other hand, sound waves are mechanical waves. This means they require a medium—be it solid, liquid, or gas—to transmit their energy and thus, to propagate. In the vacuum of outer space, where there is no air or other medium for sound waves to travel through, sound cannot be propagated.
To illustrate, if you're observing a fireworks display, you'll see the burst of light before you hear the sound because light travels faster and does not need a medium like sound does. In the vacuum of outer space, you would see the light from the fireworks, but never hear the explosion.
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In the equation Q=mcΔT,Q represents
A.) The mass substance being heated
B.) The thermal energy
C.) The specific heat of the substance being heated
D.) Temperature measured in degrees C
Answer:C
Explanation:
The specific heat capacity of the substance
In the equation Q=mcΔT, Q represents the specific heat of the substance being heated.
What is the heat capacity formula?The heat Capacity formula is expressed as the product of mass, specific heat, and change in the temperature which is mathematically given as:Q = mcΔT
Where,
Q = capacity in Joules
m = mass in grams
c = specific heat of an object in J/g °C
ΔT = change in the temperature in °C
The heat capacity problem can be applied to calculate the heat capacity, mass, or temperature difference of any given substance.Heat Capacity is described in Joule per Kelvin (J/K).So, Option C is the answer.
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When are the displacement and acceleration equal to zero for the motion of a mass on a spring?
OA at maximum displacement
OB at minimum displacement
0
at the equilibrium position
OD
at a displacement of 2x
0
at a displacement of - X
Answer:
Option B is the right answer.
Answer:
The correct answer is C. at the equilibrium position.
Explanation:
Why are “input” and “output” good words to use when discussing systems?
Answer:
To determine how efficient that system is.
Answer:
Because it gives a direct relation that can be used to obtain the efficiency E = Input/output which tell us how the system works, for example, if the efficiency is bigger than one, this means that the system amplifies the input (the output is bigger than the input) while if the efficiency is less than one, the output is smaller than the input.
Where these quantities can be forces, heat, electricity, or anything.
Which elements are not noble gases?
check all that apply
A.) Neon
B.) Helium
C.) Lithium
D.) Calcium
Lítio é metal
Hélio é gás nobre
Neônio é gás nobre
Cálcio não é gás nobre
Os gases nobres são os elementos da família 18 da Tabela Periódica, que são: hélio, neônio, argônio, criptônio, xenônio e radônio.
The elements are not noble gases include Lithium and calcium. The correct option are C and D.
What is noble gas?Noble gases are the elements of Group 18 of the periodic table. The elements are namely, helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and Oganesson (Og).
The noble gases are always stable. They do not have any valence electrons to share with any other elements. They have neutral charge.
Thus, Lithium and calcium are not noble gases.
Learn more about noble gas.
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