Answer:
In order to determine or find out about the age of archaeological finds such as fossils, rocks, etc., archaeologists use radioactive isotopes in a process called radioactive dating.
In agriculture, radioactive isotopes have a lot of uses. These comprise of but are not limited to the following:
Improvement of food cropspreservation of food, Establish and estimate the presence and volume of water in the soil for farms;Hormonal analysis for animals (livestock) etcExplanation:
C-14 and Phosphorus - 32 are examples of Radioactive isotopes. Because they decay over time, they are easy to use when it comes to radioactive dating.
When an isotope carried an unstable amount or number of atoms, neutrons, and protons, they are said to be Radioactive. It also means that they have too unstable or excess energy in their nucleus. This condition causes them to decay faster than their stable relatives.
In archaeology, dating the artifacts that are discovered is important because it helps to establish the correct relationship between one find or artifact and another. Because humans can't go back in time, one of the ways to know what humans did or didn't do, or what events occurred in a place by other living things is the items/evidence they left behind. Categorizing these times/artifacts by date helps to give a clearer picture of what happened in a particular block of time and this is exactly what dating is all about.
In agriculture, one of the radioactive isotopes used is Phosphorus - 32.
When the plant's uptake of fertilizer from the roots to the leaves needs to be established, Phosphorus-32 is utilized. A fertilizer that has already been mixed with the above radioactive isotope is administered to the plant using a hydroponic system or via the traditional means (water in the soil). The phosphorus 32 emits beta radiation which is then tracked and mapped accordingly.
Cheers
Answer:
1. C (determine the age of ancient artifacts)
2. A (understand the biological and chemical processes in plants)
3. B (determine the age of rocks and fossils)
Explanation:
The other guy didn't quite give a clear answer so I might as well help some people.
3 m/s
4 m
Which of the following is the frequency of the wave?
a) 0.75 Hz
b) 1.33 Hz
C) 1.5 Hz
d) 6.0 Hz
Answer:
0.75Hz
Explanation:
Given parameters:
Speed of the wave = 3m/s
Wavelength = 4m
Unknown:
Frequency of the wave = ?
Solution:
The speed of a wave is given by the expression below:
Speed = frequency x wavelength
Frequency = [tex]\frac{Speed }{Wavelength}[/tex] = [tex]\frac{3}{4}[/tex] = 0.75Hz
As shown in the figure above, a 50 kg box is dragged across the floor with a pulling force (Fp) of 200 N which acts at an angle of 30 degrees above the horizontal. The coefficient of kinetic friction is 0.25. What is the acceleration of the box? (Use g = 9.8 m/s2. Hint: the normal force is not equal to the weight)
Answer:
The acceleration of the box is 2.05 m/s²
Explanation:
The given parameters of the motion of the box are;
The mass of the box, m = 50 kg
The pulling force, [tex]F_p[/tex] acting on the box = 200 N
The angle at which the force acts, θ = 30° above the horizontal
The coefficient of kinetic friction, [tex]\mu_k[/tex] = 0.25
The normal reaction from the box resting on a flat surface, N = The weight of the box, W - The vertical component of the pulling force, [tex]F_{py}[/tex]
N = W - [tex]F_{py}[/tex] = m·g - [tex]F_p[/tex] × sin(θ)
Where;
g = The acceleration due to gravity = 9.8 m/s²
∴ N = W - [tex]F_{py}[/tex] = m·g - [tex]F_p[/tex] × sin(θ) = 50 kg × 9.8 m/s² - 200 N × sin(30°)
∴ N = 490 N - 200 N × 0.5 = 390 N
The normal reaction, N = 390 N
The force of friction, [tex]F_f[/tex] = The coefficient of kinetic friction, [tex]\mu_k[/tex] × The normal reaction, N
∴ [tex]F_f[/tex] = [tex]\mu_k[/tex] × N = 0.25 × 390 N = 97.5 N
The net force, [tex]F_{NET}[/tex], acting on the block = The pulling force, [tex]F_p[/tex] - The friction force, [tex]F_f[/tex]
∴ [tex]F_{NET}[/tex] = [tex]F_p[/tex] - [tex]F_f[/tex] = 200 N - 97.5 N = 102.5 N
[tex]F_{NET}[/tex] = 102.5 N
According to Newton's second law of motion on the net force acting on an object, we have;
[tex]F_{NET}[/tex] = m × a
Where;
a = The acceleration of the box
∴ a = [tex]F_{NET}[/tex]/m = 102.5 N/(50 kg) = 2.05 m/s²
The acceleration of the box = a = 2.05 m/s².
A fly travels along the x-axis. His starting point is x = 16 m and his ending point 15x = - 25 m. His flight lasts 4.0 seconds How far has he flown, what is his displacement , what is his speed and what is his velocity?
Explanation:
Starting position at x = 16m
Ending position at x = -25m
Time of flight = 4s
Unknown:
Distance flown = ?
Displacement = ?
Speed = ?
Velocity = ?
Solution:
To find the distance flown, we should understand that the body is moving on the x - plane;
So distance = 16 + 25 = 41m
Displacement is 41m to the left or -x axis
Speed is the distance divided by the time taken;
Speed = [tex]\frac{distance}{time}[/tex] = [tex]\frac{41}{4}[/tex] = 10.25m/s
Velocity is 10.25m/s along -x axis
Un atleta de helterofilia necesita levantar una barra de pesas, si necesita aplicar una fuerza para levantarla ¿cuales son los variables que intervienen para poder hacerlo?
Answer:
Se necesita la información de las siguientes variables:
(i) Fuerza normal entre los pies y la superficie.
(ii) Masa del atleta de halterofilia.
(iii) Masa de la barra de pesas.
(iv) Aceleración gravitacional.
(v) Fuerza normal entre la barra de pesas y la superficie.
(vi) Aceleración neta del centro de gravedad del sistema.
Explanation:
Sea el conjunto del atleta de halterofilia y la barra de pesas el sistema físico a estudiar. El fenómeno de levantamiento puede modelarse como traslación pura. Por las leyes de Newton tenemos que se necesita las siguientes variables para determinar la magnitud de la fuerza para levantarla (fuerza normal entre la mano y la barra de pesas) se requiere las siguientes variables:
(i) Fuerza normal entre los pies y la superficie.
(ii) Masa del atleta de halterofilia.
(iii) Masa de la barra de pesas.
(iv) Aceleración gravitacional.
(v) Fuerza normal entre la barra de pesas y la superficie.
(vi) Aceleración neta del centro de gravedad del sistema.
why does an air filled balloon get brust when it reaches its great height
Answer:
because there is external pressure is less in the height.
hope it helps.
Which air mass would form over warm water?(1 point)
maritime tropical
continental tropical
continental polar
maritime polar
Answer:
A.) Maritime Tropical (mT)
Explanation:
Continental tropical is the air mass that forms over warm land.
Maritime Polar is the air mass that forms over cold water.
Continental polar is the air mass that forms over cold land.
So therefore A or Maritime Tropical is the correct answer
What is the mass of basswood wing with these dimensions: 26.9 cm x 5.5 cm x 0.15 cm?
The mass of the basswood wing with the given dimension is 710.14 g. Basswood is a low-density, light wood.
What is basswood?Basswood is a low-density, light wood that is mainly used for artistic work such as hand carving and creating musical instruments.
The mass can be calculated by the formula,
[tex]m = v \times d[/tex]
Where,
[tex]m[/tex]- mass
[tex]v[/tex] - volume = 26.9 cm x 5.5 cm x 0.15 cm = 22.192 ml
[tex]d[/tex] - density = 32 g/cm3
Put the values in the formula,
[tex]m[/tex] = 22.192 x 32
[tex]m[/tex] = 710.14 g
Therefore, the mass of the basswood wing with the given dimension is 710.14 g.
Learn more about mass:
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the rock of 10 kg is falling near the Earth's surface.assume that g =10N/kg and the is no air resistance. what is the acceleration of the rock
Answer:
kya faltu sawal h repetitive g=10N/kg
The Bohr model below represents which answer Choice
A) Na^1-
B) Na the neutral atom
C) Na^1+
Answer:
Na⁺
Explanation:
In the given atom:
Number of protons = 11
Number of neutrons = 12
So, the number of electrons = 10
The number of protons within an atom is used to determine the kind of atom we have been given.
Since the number of protons is the same as the atomic number, here the atomic number is 11 and this is Sodium .
In this sodium atom, the number of protons is more than the number of electrons;
Charge = number of protons - number of electrons = 11 - 10 = +1
So, we have a Na⁺
How does a a magnet and paper clips relate to magnetic forces?
Answer:
they relate because one may be metal but they are both metal and they can be strong together if they are connected
Explanation:
they just are
describe the importance of measurements in brief.
Answer:
importance of measurement is it gives proper required amount of anything if it will not exist then alot of work be disrupted .In many work measurement is very necessary like in scientific works
In regards to mechanical energy, is energy being conserved ?
If only internal forces are doing work (no work done by external forces), then there is no change in the total amount of mechanical energy. The total mechanical energy is said to be conserved. ... In these situations, the sum of the kinetic and potential energy is everywhere the same.
Which of these is a result of gravitational lensing?
O the formation of multiple images of the same object
O the bending of light in an accelerating reference frame
O the curvature of space-time
Answer:
Answer is the formation of multiple images of the same object .
Explanation:
I hope it's helpful!
URGENT!!! TIMED!!!
A 130-kg football player runs at a speed of 8.0 m/s toward a 110-kg player who is standing still. After the big player tackles the smaller player, they fall together. With what speed do they fall?
Answer:
v₃ = 4.33 [m/s]
Explanation:
This problem can be solved by the conservation of linear momentum, where momentum is preserved before and after the crash or collision.
For this case, the following equation will be constructed. With values before the collision to the left of the equal sign and after the collision to the right of the equal sign.
[tex](m_{1}*v_{1})+(m_{2}*v_{2})=(m_{1}+m_{2})*v_{3}[/tex]
where:
m₁ = mass of the big football player = 130 [kg]
m₂ = mass of the second football player = 110 [kg]
v₁ = velocity of the big football player before the collision = 8 [m/s]
v₂ = velocity of the second football player before the collision = 0 (who is standing still).
v₃ = velocity of the two players after the collision [m/s]
Now replacing:
[tex](130*8)+(110*0)=(130+110)*v_{3}\\1040 = 240*v_{3}\\v_{3}=4.33[m/s][/tex]
The factors that affect gravitational pull on an object are __________________________ and __________________________
Answer:
I am not sure about this question sry but u can try asking a tutor u don't need to use any points
which change will occur in the wire of an electrical circuit as working properly
a. the wires will lose some of its mass
b. the wire will become warmer
C. the wire will form an electrical field
d. the wire will develop a new crystal structure
Answer:
b. the wire will become warmer
Explanation:
The change that will occur in the wire of an electrical circuit working properly is that the wire will become warmer.
The reason for this is that some of the electrical energy will be converted to heat or thermal energy.
As the electrons through the mobile charge carriers moves in the wire, kinetic energy increases. The source of this is from the potential difference originating from the source of the current within the circuit. Some of the energy is then converted to heat energy .This one of the source of loss in energy within the circuit.A 35 N force makes a 10 degree angle with the positive x-axis. What is the magnitude of the vertical component of the force?
Answer:
6.07 N
Explanation:
Given that,
Force, F = 35 N
It makes 10 degree angle with the positive x-axis.
We need to find the magnitude of the vertical component of the force. It can be given by :
[tex]F_y=F\sin\theta\\\\=35\times \sin(10)\\\\=6.07\ N[/tex]
So, the magnitude of the vertical component of the force is 6.07 N.
Answer:
Vertical component of force is equal to [tex]6.067[/tex] N
Explanation:
The magnitude of the vertical component on any force when α is the angle between the direction of force and the X -axis is
[tex]F_y = F * Sin\alpha[/tex]
Substituting the given values in above equation, we get -
[tex]F_y = 35 * Sin 10\\F_Y = 35 * 0.1736\\F_Y = 6.067[/tex]
Vertical component of force is equal to [tex]6.067[/tex] N
Your brother's mass is 40.0 kg, and he has a 1.30 kg skateboard. What is the combined momentum of your brother
and his skateboard if they are going 8.50 m/s?
Answer:
351.05 kg * m/s
Explanation:
Combined momentum is denoted with this formula:
p = m₁v₁ + m₂v₂In other words, the combined momentum of two masses is the sum of their masses multiplied by their velocity.
Let m₁v₁ represent the brother's mass and velocity, and let m₂v₂ represent the skateboard's velocity.
List out the known variables:
m₁ = 40.0 kgv₁ = 8.50 m/sm₂ = 1.30 kgv₂ = 8.50 m/sSubstitute the known values into the equation.
p = (40.0)(8.50) + (1.30)(8.50) p = 340 + 11.05 p = 351.05The combined momentum of the brother and his skateboard is 351.05 kg * m/s.
if an ocean has a wavelength of 2 m and a frequency of 1 wave/s then it's speed is ___ m/s.
6
DO
Which are examples of a medium?
water and air
amplitude and wavelength
crests and troughs
compressions and rarefactions
Answer:
water and air
Explanation:
The examples of medium from this problem is water and air.
A medium is an agency or a means of propagating energy, waves or even facilitating a chemical reaction.
Fluids are very good medium in chemistry for chemical reactions. The two most common media used are air and water.
In physics, a vacuum is an empty space that has been evacuated. It also serves as a medium to study some physical phenomenon.
A slingshot is fired with an initial velocity of 100 m/s at an angle of 55° follows a parabolic trajectory and hits a stationary balloon at the top of its path. With what horizontal speed does the slingshot pebble hit the balloon?
Answer:
The horizontal speed with which the slingshot hits the balloon is approximately 57.358 m/s
Explanation:
The given parameters of the slingshot motion are;
The initial velocity of the slingshot, v = 100 m/s
The angle (to the horizontal) at which the slingshot is fired makes, θ = 55°
The path of the slingshot which hits the stationary balloon at the top of its flight = Parabolic trajectory
The horizontal component of the velocity = vₓ = v·cos(θ) = Constant
vₓ = 100 × cos(55°) ≈ 57.358
The horizontal speed with which the slingshot hits the balloon = vₓ ≈ 57.358 m/s.
As frequency increases ______ decreases
A. Wavelength
B. Amplitude
C. Pitch
D. Volume
Answer:
a
Explanation:
wavelength and frequency are inversely related
difference between kinetic energy and potential energy(please i need answer in 2minutes
Answer:
Energy stored in an object due to its position is Potential Energy. Energy that a moving object has due to its motion is Kinetic Energy.
Explanation:
Welcome.
Help! will give brainliest!
Answer:
I would say increasing the balls kinetic energy
Explanation:
Because she is moving the ball and increasing kinetic energy
If a steel block has a mass of 25.6 kg and is pushed with a force of 674 N, what is its acceleration after the force is applied?
26.3 m/s^2
17300 m/s^2
26.33 m/s^2
52.3 kg m/s
Answer: 26.3 m/s²
Explanation:
F = mass x acceleration
674 N = (25.6 kg)(a)
674/25.6 = 26.3
a = 26.3 m/s²
What do u know about how the earths land is formed hint it’s made of rocks
Answer:
it's made of land, rocks, water and many more
Explanation:
if you think about it, mountains are just giant rocks. and the ocean is water and land is... well land
Answer:
Well all Ik is that when the earth was formed it was a big hot rock then the water came in and settled it and the animals kinda became land creatures the yea
Explanation:
A bicyclist moves at a constant speed of 6 m/s. How long it will take for the point bicyclist to move 36 m?
Answer:
6 seconds
Explanation:
make me brainliest
Answer:
Somuchcringe answered correctly you mark him brainliest
Explanation:
Tonya and Mario are asked to use a pan balance to find the mass of the same rock. Tonya finds the rock's mass to be 680 grams. Mario finds the rock's mass to be 672 grams. Which is the best explanation for the difference in their measurements?
A. Either Mario or Tonya measured the mass of the rock incorrectly on the pan balance.
B. The rock was cold when Tonya measured its mass and hot when Mario measured in mass.
C. The rock changed in size between the time Tonya measured it and the time Mario measured it.
D. The rock broke before Mario measured it. So the mass of the two pieces together was less than when Tonya measured it.
Answer:
A or D i put a
Explanation:
Answer: Its Either Mario or Tonya measured the mass of the rock incorrectly on the pan balance.
Explanation: ...
How did potential energy get stored in the magnet/iron rod system?
Answer:
The amount of potential energy stored in the magnetic field depends on both the strength of the magnet and the distance that another magnet or magnetic object is from it. ... All objects have a gravitational force, no matter how small, but only some objects such as iron objects can have a magnetic force.
Explanation:
The potential energy stored in the magnet/iron rod system is on the account of distance of each entities and the strength of magnets.
The given problem is based on the concept of potential energy stored in magnetic rod system.
The potential energy stored in the magnetic rod is known as magnetic potential energy, which is as a result of the exertion of magnetic force on the rod.The amount of potential energy stored in the magnetic field depends on both the strength of the magnet and the distance that another magnet or magnetic object is from it. All objects have a gravitational force, no matter how small, but only some objects such as iron objects can have a magnetic force.Thus, we can conclude that the potential energy stored in the magnet/iron rod system is on the account of distance of each entities and the strength of magnets.
Learn more about the magnetic potential energy here:
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HELP PLS
use newton's first law to explain why it is easier to turn a truck when it is empty than when it is carrying a heavy load
Answer:
When the Truck moves in a straight line, it is in the State of Motion only along the straight line. However, When the Truck turns and changes it's direction, due to it's Inertia Of Direction, it resists any change in it's direction along the straight line, it had been travelling before. As we know that, Inertia is directly proportional to the mass of the object. When the Truck is empty, there is no load on it's carriers. Hence, As the Net Mass is the mass of the Truck itself, the Inertia Of Direction too would be less.On the other hand, when the Truck transports additional loads on it's carriers, it's Total Mass now increases due to the additional mass of the load as well as pre-existing mass of the Truck itself. As the mass is greater in this case, the Inertia Of Direction is greater too.Due to an Higher Inertia in the Second Case, the Truck finds it difficult to turn itself to the desired direction.