Given a half-life of 20 minutes for element Z, a 200g sample would undergo eight cycles of reduction by half over 160 minutes, leaving 0.78g of element Z remaining. The element doesn't disappear but transforms into 'daughter elements'.
Explanation:The concept being discussed here is known as the half-life, which is the time it takes for half the atoms in a sample to decay. In this case, element Z has a half-life of 20 minutes. Given that the half-life is the time it takes for half of a substance to decay, we would use this information to determine the remaining quantity of element Z after 160 minutes.
A 200g sample of Element Z would undergo eight half-life cycles in 160 minutes (20 minutes per cycle). Following the pattern of half-life decay, after each cycle the remaining amount would be 100g, 50g, 25g, 12.5g, 6.25g, 3.125g, 1.56g, and finally 0.78g. So, after 160 minutes, there would be 0.78g of element Z remaining.
Please note that the substance doesn't completely disappear but transforms into decay products or, using the metaphor, 'daughter elements' while element Z is the 'parent' element.
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A ray of light passes from air into carbon disulfide (n = 1.63) at an angle of 28.0 degrees to the normal. what is the refracted angle?
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.20×106 N , one at an angle 12.0 ∘ west of north, and the other at an angle 12.0 ∘ east of north, as they pull the tanker a distance 0.700 km toward the north.
Which of the following would decrease the magnetic field around a wire?
A. decreasing the current
B. reversing the poles of the wire
C. looping a section of the wire into a solenoid
D. increasing the current
A cran uses an average force of 5200N to lift a steel beam 25m. How much work does the crane do on the steal beam.
Please help or explain how to do this anyone. Please and thank youu
When the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the solenoid moves to the left, indicating that a current is produced. the magnet is then pulled out at a faster speed.what will be the result?a larger current in the same directiona larger current in the opposite directiona smaller current in the same directiona smaller current in the opposite direction?
answer BBBBBBBBBBBB on EDGE
Answer:
a larger current in the opposite direction
Explanation:
As we know by Faraday's law of electromagnetic induction that rate of change in magnetic flux will induce electric current in a conducting coil linked with it
so it is given as
[tex]EMF = \frac{d\phi}{dt}[/tex]
now in this situation we know that first a magnet is entering into the coil so here the magnetic flux is increasing linked with the solenoid coil.
So it will induce some current in the coil which shows deflection in galvanometer coil.
Now when we pull the magnet out then it will decrease the flux linked with the coil so here the direction of induced current must have to decrease.
Also it is given that coil is removed at faster rate due to which the rate of change in flux will be more so here it will induce more current
so correct answer would be
a larger current in the opposite direction
Magnetic fields are produced by: atoms currents voltages charges
Answer:
curtent
Explanation:
If you are looking straight ahead an object that is behind you is in your cone of vision.
a. True
b. False
Answer:
b. False
Explanation:
An object that is behind you, is not in your cone of vision, since your cone of vision, is an imaginary cone that projects from your eyes foward, approximate 60-degree angle straight foward. The cone of vision is the area of sight.
As you can not see behind you, an object behind you, is not in your cone of vision.
At its nucleus, the milky way galaxy is about 100,000 light-years wide and _____.
At it's nucleus,the milky-way galaxy is about 100,000 light-years wide and 10,000 light-years thick
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A 72 kg sled Is pulled forward from rest by a snowmobile and accelerates at 2 m/s squared forward for five seconds. The force of friction acting on the sled is 120 N backwards. The total mass of the snowmobile and driver is 450 kg. The drag force acting on the snowmobile is 540 N backwards. What is the tension in the rope.
Final answer:
The tension in the rope is 516 N.
Explanation:
To find the tension in the rope, we need to calculate the net force acting on the sled. The net force is equal to the mass of the sled multiplied by its acceleration. Given that the sled has a mass of 72 kg and accelerates at 2 m/s² for 5 seconds, we can use the equation:
Net force = mass x acceleration
Net force = 72 kg x 2 m/s² = 144 N
However, there are two forces acting in the opposite direction - the force of friction (120 N backwards) and the drag force (540 N backwards). So, the net force is:
Net force = 144 N - 120 N - 540 N = -516 N
The negative sign indicates that the net force is acting in the opposite direction of motion. Therefore, the tension in the rope is equal in magnitude and opposite in direction to the net force, so the tension in the rope is 516 N.
Which describes constant acceleration in one direction? a baseball moving in a curved path over a fence a basketball at rest a skydiver in free fall a car increasing its speed while moving around a curve
Final answer:
A skydiver in free fall describes constant acceleration in one direction since gravity provides a constant acceleration downwards near Earth's surface.
Explanation:
The question asks which scenario describes constant acceleration in one direction. The correct answer is a skydiver in free fall. This is because, near the surface of the Earth, an object in free fall experiences a constant acceleration due to gravity, with a magnitude of approximately 9.8 m/s².
The direction of this acceleration is vertically downwards, and it remains constant in both magnitude and direction in the absence of air resistance.
In contrast, a car rounding a bend, a merry-go-round increasing speed, or a pendulum swinging all experience changing directions or types of motion which do not represent constant acceleration in one direction.
According to charles' law, the volume of a fixed amount of gas is directly proportional to
According to Charles's law, the volume of a fixed amount of gas is directly proportional to its Kelvin temperature, assuming constant pressure. It means that volume of the gas increases with increase in temperature and decreases with decrease in temperature.
Explanation:According to Charles's law, the volume of a fixed amount of gas is directly proportional to its Kelvin temperature when the pressure is held constant. This law was named after the French scientist Jacques Alexandre César Charles, a pioneer in balloon flight. It essentially means that when the temperature of gas increases under constant pressure, the volume of the gas also increases and vice versa.
For instance, if you raise the gas temperature from 283 K to 303 K at a constant pressure, you will see an increase in its volume from 0.300 L to 0.321 L, corroborating Charles's law.
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A car turns a corner that has a radius of 5 m and experiences a centripetal acceleration of 20 m/s². If the radius of turn were increased to 10 m, calculate the centripetal acceleration.
Answer:
10
Explanation:
If element "X" is heavier than element "Y" then...
Question 4 options:
A.) Element "X" must be a metal.
B.) Then Element "X" must be on the right side of the periodic table.
C.) Element "X" must have more particles in the nucleus than Element "Y."
D.) Element "X" must have a higher melting point than Element "Y."
What are the reactants and what is the product of Zn(s)+S(s)->ZnS(s)
In the reaction, Zn(s) + S(s) -> ZnS(s), Zinc (Zn) and Sulfur (S) are the reactants and Zinc Sulfide (ZnS) is the product. This type of reaction is known as a combination or synthesis reaction.
Explanation:In a chemical reaction, substances that interact are called reactants, and the newly formed substances are called products. In the reaction you have given, Zn(s) + S(s) -> ZnS(s), the reactants are zinc (Zn) and sulfur (S), and the product formed is zinc sulfide (ZnS). This type of reaction is a synthesis or combination reaction wherein two or more simple substances combine to form a more complex substance. It's important to note that in this reaction, Zn and S are in their elemental forms and the reaction represents the process of sulfide mineral formation.
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In the reaction Zn(s) + S(s) → ZnS(s), the reactants are zinc (Zn) and sulfur (S), both in solid form. The product is zinc sulfide (ZnS), also in solid form. This is a synthesis reaction where the elements combine to form a single compound.
Reactants and Product of Zn(s) + S(s) → ZnS(s)
In the chemical reaction Zn(s) + S(s) → ZnS(s), the reactants are zinc (Zn) and sulfur (S), both in their solid forms. The product of this reaction is zinc sulfide (ZnS), which is also in the solid state. Here is the step-by-step identification:
Reactants: Zinc (Zn) and Sulfur (S)
Product: Zinc Sulfide (ZnS)
This reaction is an example of a synthesis reaction, where two or more elements combine to form a single compound.
While some aspects are based on ____, body composition is largely a result of ____,
A. BMI;BMR
B. Diet;Excercise
C. Heredity;Lifestyle
D. Lifestyle;Heredity
Answer : Option C) Heredity; Lifestyle.
Explanation : While some aspects are based on heredity, body composition is largely a result of Lifestyle.
Even though it is believed that 80 percent of the aspects of a human body is heredity, but an individual body composition is largely influenced by the result of the lifestyle an individual lives.
What is the correct current value if the selector is in the 0.5 dcma position?
The correct current value is 1.35 A.
Explanation:The correct current value in the 0.5 dcma position can be determined using the given information. According to the information provided in the question, after 5.00 ms, the current declines to 0.368 of the initial value at t=0. Therefore, we can find the initial value of the current by dividing the value at t=5.00 ms by 0.368. Let's calculate:
Initial current = (0.368)(3.68 A) = 1.35 A
So, the correct current value if the selector is in the 0.5 dcma position is 1.35 A.
What is speed?
A. Distance (miles or meters)
B. Time (hours or seconds)
C. Time per distance (hours per mile or seconds per meter)
D. Distance per time (miles per hour or meters per second)
A person on earth would weigh a lot more on the sun due to increased ________________. gravity mass atoms energy
Answer:
Gravity
Explanation:
The weight of a person is given by :
W = m g
Where
m is the mass of the person
g is acceleration due to gravity.
Weight of the person depend on the value of acceleration due to gravity. The mass of the person remains the same in every location. On the surface of earth it is equal to 9.8 m/s². While on surface of sun it is equal to 274 m/s².
Hence, a person on earth would weigh a lot more on the sun due to increased gravity.
How does a gas do work?
A. By changing volume
B. By creating energy
C. By conserving energy
D. By flowing
A gas does work by changing its volume, adhering to the law of conservation of energy and resulting in increases in energy, pressure, and/or temperature.
A gas can do work by changing its volume. When a gas in a cylinder expands, it exerts a force on the piston and moves it, doing work. According to the Ideal Gas Law, work done by a gas results in an increase in its energy, which can manifest as an increased internal kinetic energy due to the motion of its atoms and molecules. This concept adheres to the law of conservation of energy, meaning that energy within a closed system is neither created nor destroyed, but can change forms. An example of work being done by a gas is when you inflate a bicycle tire; the air pressure and temperature increase inside the tire due to the work done by the pump.
Thus, the correct answer to how a gas does work is A. By changing volume.
Find the wavelength of a wave traveling at 3.26 e6 m/s with a period of 0.0125 s.
Answer:
m=40.8km.
Explanation:
The frequency of a wave is the reciprocal of its period, so for the wave in this problem, its frequency isf= \frac{1}{T}= \frac{1}{0.0125 s} =80 Hzf=T
1
=
0.0125s1
=80Hz
The basic relationship bet
where
\lambdaλ is the wavelength of the wave
v is its speed
f is its frequency
If we plug the numbers given by the problem into this equation, we can find the wavelength of this wave:
\lambda= \frac{v}{f}= \frac{3.26 \cdot 10^6 m/s}{80 Hz}=4.08 \cdot 10^4 m=40.8 kmλ=
f v
=
80Hz
3.26⋅10
6
m/s
=4.08⋅10
4
m=40.8km
A bus moves with 500000joules the driver applies brakes how much work is needed for the bus to stop
Where must an object be placed to form an image 30.0 cm from a diverging lens with a focal length of 43.0 cm?
What type of collision is it if it bouunces of of each oyher?
A ground-fault circuit interrupter is a (an) _____. A)wire that provides an easier path for a current to take if a short circuit develops B) electrical safety outlet that monitors current flowing to and from an appliance C) switch that opens when current in a circuit is too high
B) electrical safety outlet that monitors current flowing to and from an appliance.
What is Ground fault circuit interrupter?A GFCI should be used in any indoor or outdoor area where water may come into contact with electrical products.
The GFCIs be used in all kitchens, bathrooms, garages, and outdoors.
Here,
A ground-fault circuit interrupter is an electrical safety outlet that monitors current flowing to and from an appliance.
The ground-fault circuit interrupter, or GFCI,
It is a fast acting circuit breaker designed to shut off electric power in the event of a ground-fault within as little as 1/40 of a second.
It works by comparing the amount of current going to and returning from equipment along the circuit conductors.
Therefore,
A ground-fault circuit interrupter is an electrical safety outlet that monitors current flowing to and from an appliance.
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A radioactive sample has a count rate of 800 counts per minute. One hour later, the count rate has fallen to 100 counts per minute. What is the half-life of the sample?
The image shows a pendulum that is released from rest at point A. Which energy transformation is correct? From A to C, kinetic energy is transformed into gravitational potential energy. From C to D, kinetic energy is transformed into gravitational potential energy. From C to E, gravitational potential energy is transformed into kinetic energy. From D to E, gravitational potential energy is transformed into kinetic energy.
Answer:
Partially: From C to D, kinetic energy is transformed into gravitational potential energy and From D to E, gravitational potential energy is transformed into kinetic energy
Explanation:
What happens in this pendulum is that at point A, there's only gravitational potential energy (no velocity=no kinetic energy)
At point C, it has maximum speed since all of the potential energy is transformed into kinetic energy (no potential gravitational energy at this point)
At point E, it is the same as at point A. (no kinetic energy)
At the intermediate points (B and D) there are both kinetic and potential energy. At point B the kinetic energy is increasing and at point D it is decreasing.
Now let's see each case:
- From A to C, kinetic energy is transformed into gravitational potential energy: It is actually the opposite, so no.
- From C to D, kinetic energy is transformed into gravitational potential energy: Yes, but not all of it is transformed since it still has kinetic energy that allows it to get til point E.
- From C to E, gravitational potential energy is transformed into kinetic energy: No, it is the opposite.
- From D to E, gravitational potential energy is transformed into kinetic energy: Yes, but not all of it, since at point D it also has kinetic energy.
The kinetic energy is transformed into gravitational potential energy from point C to B. But complete transformation is not happening. Thus, the statement is somehow correct.
The analysis of pendulum is given as follows:
At point A, there's only gravitational potential energy and no kinetic energy, because the pendulum is at rest at A. At point C, it has maximum speed since all of the potential energy is transformed into kinetic energy. Therefore, at this point there is only kinetic energy and no potential energy. At point E, it is the same as at point A, but in opposite side. So, at this point there is no kinetic energy. At points B and D there are both kinetic and potential energy. At point B the kinetic energy is increasing and at point D it is decreasing.
Now as per the given statements:
From A to C, kinetic energy is transformed into gravitational potential energy. It is actually the opposite. Thus, the statement is incorrect. From C to D, kinetic energy is transformed into gravitational potential energy. At this interval, the kinetic energy is converting into potential energy but the conversion is not complete. Thus, the statement is somehow correct. From C to E, gravitational potential energy is transformed into kinetic energy. At this point, the kinetic energy is converting into the potential energy. Thus, the statement is incorrect. From D to E, gravitational potential energy is transformed into kinetic energy. This statement incorrect because there is conversion of kinetic energy into potential energy.Thus, we can conclude that from C to D, the kinetic energy is transformed into gravitational potential energy, but the transformation is not complete. Hence, statement (B) is correct.
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For the electric field shown, which of the following statements describes an increase in voltage?
A) A negative charge crosses an equipotential line toward the source charge.
B) You cannot tell from the information given.
C) A positive charge crosses an equipotential line toward the source charge.
D) A positive charge moves along an equipotential line.
UPDATE: ANSWER IS C
Answer:
C
Explanation:
Just took test
A sound from a source has an intensity of 270 dB when it is 1 m from the source.
What is the intensity of the sound when it is 3 m from the source?
30 dB
90 dB
810 dB
2430 dB
what is the difference between series and parallel circuits and examples of when you would use them ?
Which substances resist pH changes?
Acids
Hydrogen ions
Buffers
Bases
The correct choice is Buffers.
Buffers contains both acids and bases in equilibrium.when base is added to buffers, they adjust the pH value by releasing hydrogen ions.when acid is added to buffers, they adjust the pH value by consuming hydrogen ions. hence these substances resist any change in their pH value by releasing or absorbing hydrogen ions.This process keeps the pH value constant.