Carbon-14 is a radioactive isotope of carbon with a half-life of 5,730 years. A paleontologist finds fossil that contains 25% of its original amount of carbon -14 atoms. How old is the fossil?
The age of the fossil which contains the Carbon-14 radioactive isotope is 11460 years
How to determine the number of half-lives Original amount (N₀) = 100%Amount remaining (N) = 25%Number of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 100 / 25
2ⁿ = 4
2ⁿ = 2²
n = 2
How to determine the age Half-life (t½) = 5730 yearsNumber of half-lives (n) = 2Time (t) =?t = n × t½
t = 2 × 5730
t = 11460 years
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Which two factors are used to calculate the kinetic energy of an object?
Answer: Mass and velocity
K = 0.5*m*v^2
Explanation:
Hope it helps!
Answer:
mass and velocity
Explanation:
Kinetic Energy = 1/2 * m * v^2 m= mass v = velocity
what is the force acting on an object with a mass of 150 kg starting from rest and traveling 15m/s in 250s?
Answer:
9N
Explanation:
F = ma
F = 150kg × (15 - 0)m/s / 250s
F = 9N
Mr. Ben drove from Town A to Town B. For the first 3 hours, he
traveled at an average speed of 60 km/h, and after that, he drove at another average speed of 70 km/h. If the distance between Town A and B is 460 km, what was the total time for the whole journey?
The total time for the whole journey = 7 hours
Distance = Speed x time
Distance traveled for the first 3 hours
time = 3 hours
speed = 60 km/h
Distance = 60 x 3
Distance = 180 km
180 km was traveled for the first three hours
Total distance traveled = 460 km
Distance traveled at an average speed of 70 km/h = 460 - 180
Distance traveled at an average speed of 70 km/h = 280 km
Speed = Distance / time
70 = 280 / time
time = 280 / 70
time = 4 hours
Mr. Ben traveled 3 hours at an average speed of 60 km/h, he traveled 4 hours at an average speed of 70 km/h.
The total time for the whole journey = 3 hours + 4 hours
The total time for the whole journey = 7 hours
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Hello people ~
Feathery stigma occurs in
(a) pea
(b) wheat
(c) Datura
(d) Caesalpinia
Answer:
(B) wheat
Explanation:
Wheat is an anemophilous plant (form of pollination by which wind distributes pollen)They lack petals and sepals (outer whorls of the flower)The female plants consist of an ovary (female reproductive part) from which two styles (connecting stigma and ovary) ariseThe feathery stigma catches the pollen and sends it to the ovary for fertilization(b) wheat
Feathery stigma refers to wind pollinated flowers.
Wind pollinated flowers are smooth, light in weight, dull and does not contain nectar.
Wheat is light and does not contain nectar.
Datura have huge petals, pea is heavy, caesalpinia have beautiful petals, which all leads to insect pollinated.
wind pollinated flowers:
wheat, rice, corn and oats.
is the amount of force acting on a given area.
Answer:
[tex]\huge\boxed{\sf Pressure}[/tex]
Explanation:
Pressure:
The amount of force acting on per unit area is called pressure.Mathematical form:
[tex]P = \frac{F}{A}[/tex]Unit:
The unit of pressure is N/m² or Pascal. Many other units are also used for pressure.[tex]\rule[225]{225}{2}[/tex]
The type of galaxy that sometimes has a distinct bar of stars running across the central region is:.
HELP!
Explain how the conservation of energy and the conservation of matter might still be considered true when put together in spite of the ability of each to convert into the other.
Answer:
the conservation of both matters because without each other the balance of nature will be destroyed it helps in such a way that the food chain will be maintained.
it is as such considered because without matter there would be no energy and the reverse is such.
it is still considered because without one another famous atomic theories wouldn't have been made such as gas, liquid and solid.
in conclusion all these work together to balance the galaxy as a whole
Both the conservation of energy and the conservation of matter is important because, without each other, the natural equilibrium will be disrupted.
What is the law of conservation of energy?According to the Law of conservation of energy. Energy can not be created nor be destroyed it can transfer from one to another form.
The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.
The conservation of both is important because without each other, the natural equilibrium will be disrupted, and it aids in the maintenance of the food chain.
It is seen as such because there would be no energy without matter and vice versa.
Hence both the conservation of energy and the conservation of matter is important
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Question 1 of 10
What do all waves in the electromagnetic spectrum have in common?
OA. They have the same distance between crests.
OB. They have the same energy.
C. They have the same rate of motion.
D. They have the same frequency.
SUBMIT
Answer:
They have the same rate of motion.
Explanation:
Electromagnetic radiation is a type of energy that is commonly known as light. Generally, light travels in waves, and all electromagnetic radiation travels at the same speed, which is about 3.0 × 108 ms− 1 through a vacuum.
Read the scenario and social media post.
Damien is researching organic gardening, which avoids pesticides—chemicals used to kill harmful insects. While looking for sources, he runs across this social media post.
Answer:
No answer
Explanation:
Because there is no question
Answer:
C. Biased in favor of pesticides.
Explanation:
What is the speed of a wave that has a frequency of 250Hz and a Wavelength of 1.5 m?
Question :-
What is the Speed of a Wave that has a Frequency of 250 Hertz and a Wavelength of 1.5 meter ?Answer :-
Speed of the Wave is 350 m/s .Explanation :-
As per the provided information in the given question, we have been given that the Frequency of the Sound Wave is 250 Hertz. Its Wavelenght is given as 1.5 Meter. And, we have been asked to calculate the Speed of the Wave.
For calculating the Speed , we will use the Formula :-
[tex] \bigstar \: \: \boxed {\sf { \: Speed \: = \: Frequency \: \times \: Wavelenght \: }} [/tex]
Therefore , by Substituting the given values in the above Formula :-
[tex] \Longrightarrow \: \: \sf { \: Speed \: = \: Frequency \: \times \: Wavelenght }[/tex]
[tex] \Longrightarrow \: \: \sf { \: Speed \: = \: 250 \: \times \: 1.5 }[/tex]
[tex] \Longrightarrow \: \: \bf { \: Speed \: = \: 375 }[/tex]
Hence :-
Speed of the Wave = 375 m/s .[tex] \underline {\rule {180pt}{4pt}} [/tex]
Speed = Frequency Wavelenght
Speed
Speed
Hence :
Speed of the Wave = 375 m/s.
=
250 x 1.5
375
The conversion of ozone to diatomic oxygen is represented by the equation above. Based on the data in the table above, what is the approximate average bond enthalpy for the oxygen-to-oxygen bonds in ozone?.
The approximate average bond enthalpy for the oxygen-to-oxygen bonds in ozone is 300 kJ/mol. The ozone is composed of three oxygen atoms, and it's highly reactive.
What is ozone?Ozone is a light blue-colored gas, that is highly soluble in an inert, non-polar solvent.
[tex]2O_3 \rightarrow 3O_2 \\\\ \Delta H = -300 KJ/mol[/tex]
There are double bonds present in the ozone, two molecules of ozone mean there will be four bonds.
[tex]4 \times E -3 \times 500 = -300\\\\4 \times E = -300 + 1500\\\\E = \dfrac{1200}{4} \\\\E = 300 \;KJ/mol[/tex]
Thus, the correct option C, 300 kJ/mol.
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Four identical particles of mass m are mounted at equal intervals on a thin rod of length l and mass m, with one mass at each end of the rod.
Answer:
Moment of inertia at distance L / 2 from center
I1 = M (L / 2)^2 = M L^2 / 4
I2 = M (L / 6)^2 = M L^2 / 36 at a distance of L / 6
I (1/2 rod) = I1 + I2 = M L^2 (1/4 + 1/36) = M L^2 (9 + 1)/ 36 = 5/ 18 M L^2
I for entire rod = 2 I (1/2 rod) = 5 / 9 M L^2
A transfer of energy from thermal to potential
Conduction
The material which suppose Conduction called conductorsIn this heat is transmitted from one thermal to another .Metals are usually good conductors where as non metals are notExplanation:
According to online, "thermal energy is just a fancy word for heat energy. It's a form of both potential and kinetic energy. If you remember, the electrons of an atom have potential energy. Once you apply pressure to the electrons, they start to move rapidly, banging into each other, and releasing thermal energy as heat."
Thermal energy transfers occur in three ways: conduction, convection, and radiation
The stimuli for kinesthesis is the __________ energy of joint and muscle movement. a. thermal b. electrical c. mechanical d. chemical
The complete statement is "The stimuli for kinesthesis is the mechanical energy of joint and muscle movement.". Option C. This is further explained below.
What is kinesthesis?Generally, Kinesthetic helps in this way wherewith one's eyes closed, there is awareness of the locations of the body parts.
In conclusion, mechanical energy of joint and muscle movement is the stimuli for kinesthesis
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Why burette calibrated from top to bottom?
Answer:
In order to measure the amount of solution added in or drained out, the burette must be observed at eye level straight to the bottom of the meniscus. The liquid in the burette should be completely free of bubbles to ensure accurate measurements.
Every time your cat's paw hits her toy string, it swings away from her. How does
this demonstrate Newton's third law of motion?
Objects with mass, such as your cat's paw and toy string, will require inertia.
Objects in action, such as the string toy, will experience force.
For every motion from your cat's paw, there is unbalanced inertia from the string.
For every action your cat makes, there is an equal and opposite reaction from the string.
Answer:
D?
Explanation:
Newton's Third Law of Motion: For every action, there is an opposite reaction, and forces come in pairs
Answer: Answer choice D
Explanation:
Newtons 3rd law states that for every action there is an equal and opposite reaction. In the scenario, the cat hitting the toy is the action, and the ball swinging away is the reaction.
What is the value of a in the function’s equation?
A.
3
B.
-2
C.
2
D.
-3
Answer:
Explanation:
What is the value of a in the function's equation?
A. -2
B. -3
C. 3
D. 2
ANSWER: c.
What is the best way to arrange the magnets on the train and on the track so that the model train levitates?
Answer:
See below
Explanation:
So the magnets poles are opposed and the magnets REPEL each other
An 80g meter stick is supported at its 30 cm mark by a string attached to the ceiling. A 20 g mass is hung from the 80 cm mark what mass should be hung at the 5 cm mark on the meter stick to keep it horizontal and in equilibrium?
Answer:
[tex]104\; {\rm g}[/tex], assuming that the meter stick is uniform with the center of mass precisely at the [tex]50\; {\rm cm}[/tex] mark.
Explanation:
Refer to the diagram attached. The meter stick could be considered as a lever. The string at the [tex]30\; {\rm cm}[/tex] mark would then act as the fulcrum of this lever.
The [tex]m_{A} = 20\; {\rm g}[/tex] mass at the [tex]80\; {\rm cm}[/tex] mark is at a distance of [tex]r_{A} = 50\; {\rm cm}[/tex] to the right of the fulcrum at [tex]30\; {\rm cm}[/tex].
The weight of the [tex]80\; {\rm g}[/tex] meter stick acts like a weight of [tex]m_{B} = 80\; {\rm g}[/tex] attached to the center of mass of this meter stick. Under the assumptions, this center of mass of this meter stick would be at the [tex]50\; {\rm cm}[/tex] mark, which is [tex]r_{B} = 20\; {\rm cm}[/tex] to the right of the fulcrum at [tex]30\; {\rm cm}[/tex].
Let [tex]m_{C}[/tex] be the mass attached to the meter stick at the [tex]5\; {\rm cm}[/tex] mark. This mass would be at a distance of [tex]r_{C} = 25\; {\rm cm}[/tex] to the left of the fulcrum at [tex]30\; {\rm cm}[/tex].
At equilibrium:
[tex]\begin{aligned} & m_{C}\, r_{C} && (\text{mass on the left of fulcrum})\\ &= m_{A}\, r_{A} + m_{B} \, r_{B} && (\text{mass on the right of fulcrum})\end{aligned}[/tex].
Solve for [tex]m_{C}[/tex], the unknown mass attached to the meter stick at the [tex]5\; {\rm cm}[/tex] mark:
[tex]\begin{aligned}m_{C} &= \frac{m_{A}\, r_{A} + m_{B}\, r_{B}}{r_{C}} \\ &= \frac{20\; {\rm g} \times 50\; {\rm cm} + 80\; {\rm g} \times 20\; {\rm cm}}{25\; {\rm cm}} \\ &= 104\; {\rm g}\end{aligned}[/tex].
A circuit connected to a battery of 1.9 voltage. has a current of 0.07 amps. What is the resistance
of the circuit
Answer:
27.14 ohms
Explanation:
V = IR
V/I = R
1.9 v / .07 a = 27.14 ohms
Tina speaks using a nonelectric megaphone. The megaphone makes her voice louder in one direction.
How does a megaphone work?
Select one:
It affects the vocal cords of a person and allows them to make louder sounds.
It increases the amplitude of spreading sound waves.
It changes the frequency of the spreading sound waves.
It collects sound waves and reflects them in a direction
The megaphone makes her voice louder in one direction, increases the amplitude of spreading sound waves.
What is megaphone?Megaphone is a Spotify-owned podcast technology company that specializes in ad insertion and hosting.
While the distance between from the crest of a wave to the next crest is known as the amplitude.
The megaphone makes her voice louder in one direction, increases the amplitude of spreading sound waves.
Hence, option B is correct.
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Two springs are attached to two hooks. When equal weights are suspended from each spring, both stretch the same amount. What can be assumed about the force constants of both?
It can be assumed that the spring constant will be same.Because the weight applied and the extension is same
What is spring force?The force required to extend or compress a spring by some distance scales linearly with respect to that distance is known as the spring force. Its formula is
F = kx
Two springs are attached to two hooks. When equal weights are suspended from each spring, both stretch the same amount.
Extensions will be greater in spring B than in spring A.Remember that the force constant represents the spring's stiffness,
Hence It can be assumed that the spring constant will be same.Because the weight applied and the extension is same.
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Water shortages means.no no no links pls
Answer:
The lack of sufficient water resources, including a lack of access t safe water supplies, to meet water needs within a region.
Explanation:
What are the assumptions on which the cosmological principle is based?.
What is the relationship between frequency and wavelength?
Answer:
The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one half the wavelength.
Explanation:
Frequency and Wavelength are inversely proportional to each other.
Help !!
If an object is placed 3 cm from the mirror, how far will the object appear “behind” the mirror?
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
As we know the property of a plane mirror, image formed by it is always virtual, of same Size as the object and at the same Distance as the object from the mirror. so we can say that the distance of image from the object = 3 cm from the mirror ( as per the property ) and at a distance of 6 cm from the object.
When white light is refracted by a prism, which color of light is bent the least? red yellow green
Answer:
Red light would bend the least, because of its wavelengths in the sun, also basing on how reflective the prism or light source is.
__________________________________________________________
Questions?Ask in comments.
What is an Astroid belt
The Schwarzschild radius of a black hole depends on ________.only the mass of the black holeboth the mass and density of the black holethe way in which the black hole formedthe observationally measured radius of the black hole
The Schwarzschild radius of a black hole depends on the mass and density of the black hole because volume is the space that an object occupies.
What is volume?Volume is defined as the amount of space occupied by an object. It can be measured in cubic units. If the black hole has more volume then it has more radius and vice versa.
So we can conclude that the Schwarzschild radius of a black hole depends on the mass and density of the black hole because volume is the space that an object occupies.
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