On heating a lead bar, its volume increases, density decreases and its mass remains constant.
According to Ideal gas equation,
pV = nRT
ρ = m / V
V = Volume
T = Temperature
ρ = Density
m = Mass
Based on Ideal gas equation, Volume is directly proportional to Temperature. As temperature increases, volume also increases. Based on density formula, Volume is indirectly proportional to Density. As Volume increases density decreases.
In any reaction, the mass is always conserved. Because, mass is the amount of matter present in a substance. During a reaction, atoms are neither created nor destroyed, just rearranged. So the mass always remains constant.
Therefore, if a lead bar was heated to 120°C, its volume increases, density decreases and its mass remains constant.
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A ball of mass 0.1kg is thrown vertically upwards with an initial velocityof 80 m/s. calculate the pontential energy (i) half way up (ii) at its maximum height. what is its kinetic energy as it leaves the ground
Answer:
Stated below:
Explanation:
Let's calculate the maximum height
.
H=v^2/2g=320mH=v
2
/2g=320m
PE=mgh=0.1*10*320=320 J
at halfway up PE will be half of max = 320/2=160 J
KE will be equal to PEmax=320 J.
Hope I helped! ☺
which if the following is the best example of a thermodynamiclly open system?
The following which is the best example of a thermodynamically open system is a cup of coffee and is therefore denoted as option A.
What is an Open system?This is referred to as the type of system in which matter and/or energy may enter and exit. There is also an exchange of both matter and energy with its surroundings.
An example is a cup of coffee because thermal energy is lost to the surrounding which is usually in the form of vapor. Other options such as our universe and insulated gas cylinder are closed system which is why there is usually no exchange of energy with external environment thereby making it the correct choice.
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The full question is:
which if the following is the best example of a thermodynamiclly open system?
A. a cup of coffee
B. our universe
C. a greenhouse
D. an insulated gas cylinder
what happens at a transform boundary
Answer:
Answer is "two tectonic plates slide past eachother" ( for a pe x)
Explanation:
An ideal gas initially at pressure P0, volume V0, and temperature T0 is taken through the cycle described in the figure below. (Assume n = 4 and m = 5.)
a) Find the net work done by the gas per cycle in terms of P0 and V0.
b)What is the net energy Q added to the system per cycle? (Use any variable or symbol stated above as necessary.)
c) Obtain a numerical value (kJ) for the net work done per cycle for 1.00 mol of gas initially at 0°C. Hint: Recall that the work done by the system equals the area under a PV curve.
The net work done per cycle for 1.00 mol of gas initially at 0°C is 4.88 kJ.
An isothermal process is a thermodynamic process in which the temperature of the system remains constant, while other state variables such as pressure and volume may change. An adiabatic process is a thermodynamic process in which there is no exchange of heat between the system and its surroundings, while other state variables such as pressure and volume may change.
a) The net work done by the gas per cycle is equal to the area enclosed by the cycle on the PV diagram. From the given figure, the cycle can be divided into two parts: the first part is an isothermal expansion from volume V0 to volume 5V0 and the second part is an adiabatic compression from volume 5V0 to volume V0.
For the isothermal expansion, the pressure decreases from P0 to P0/4. Using the equation for the work done during an isothermal process, the work done by the gas during this part of the cycle is:
W1 = nRT0 ln(5) = 4RT0 ln(5)
For the adiabatic compression, the pressure increases from P0/4 to P0. Using the equation for the work done during an adiabatic process, the work done by the gas during this part of the cycle is:
W2 = (P0V0^m/P0/4*(5V0)^m)^(1 - m)/1-m - (P0/4*(5V0)^m/P0/4)^(1 - m)/1-m = 4P0V0/3(1 - 1/5^(4/5))
The net work done by the gas per cycle is the sum of the work done in each part of the cycle:
W = W1 + W2 = 4RT0 ln(5) + 4P0V0/3(1 - 1/5^(4/5))
b) Since the cycle is closed, the net energy added to the system per cycle must be equal to the net work done by the gas per cycle:
Q = W = 4RT0 ln(5) + 4P0V0/3(1 - 1/5^(4/5))
c) To obtain a numerical value for the net work done per cycle for 1.00 mol of gas initially at 0°C, we need to substitute the appropriate values for R, T0, P0, V0, n, and m. Assuming the gas is an ideal gas, R = 8.314 J/mol K. At 0°C (273 K), the pressure of 1.00 mol of gas in a volume of V0 = 22.4 L (molar volume of ideal gas at STP) is P0 = 1 atm. Therefore,
W = 4(8.314 J/mol K)(273 K) ln(5) + 4(1 atm)(22.4 L)/3(1 - 1/5^(4/5))) = 4.88 kJ
Therefore, the net work done per cycle for 1.00 mol of gas initially at 0°C is 4.88 kJ.
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1. Define the law of conservation of momentum in your own words.
2. Which of Newton's laws explains how momentum is conserved in all interactions between objects?
3. What do you know about the forces involved in an interaction between two objects?
4. Is momentum a vector or a scalar quantity? Based on your answer, which other value is important
besides the numerical value of momentum?
5. How do you find the total momentum of objects in a system?
6. If objects are traveling in opposite directions, what do you know about the signs of their momenta?
7. What characteristics are required for a system to be considered closed and isolated?
8. What forces are considered when we examine interactions between two objects in a closed, isolated
system?
9. If two objects begin at rest, what is the total momentum of the system before they push off from one
another? What is the momentum of the system after they push off from one another?
1. Total momentum of an isolated system before collision is always equal to total momentum after collision is called conservation of momentum.
2. Newton's third law explains how momentum is conserved in all interaction between objects.
3. Force is an unopposed interaction between two or more bodies that apply the shift in the objects state of motion. The action and reaction are two interacting forces that we called as Newton's third law of motion. There are two forces acting on two interacting objects in any interaction.
4. Momentum is a vector quantity and has the same direction as velocity. It is the product of mass (a scalar quantity) and velocity (a vector quantity).
5. To find total momentum of the system , add their individual momentums together. Calculate momentum for each object by using formula P=mv, where P is momentum, m is mass, v is velocity.
6. If the objects are travelling in opposite direction, then the overall momentum will be zero. They have same mass and velocity, when their momentum vectors add up to exactly zero when added together.
7. Closed system in which the exchange of only energy with its surroundings takes place. An isolated system in which no exchange of matter or energy takes place.
8. The internal forces are considered when we examine interaction between two objects in a closed and isolated system because these forces cause momentum of the system to be transferred between one object to another.
9. Before the push-off, the total initial momentum is zero. The total momentum after the push-off should also be zero.
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5 description of non polar molecule and 5 polar molecule?
Answer:
Non- polar molecules does not have the charges present at the end due to the reason that electrons are finely distributed and those which symmetrically cancel out each other are the non- polar molecules.
In a solution, a polar molecule cannot be mixed with the non-polar molecule.For example, consider water and oil. In this solution, water is a polar molecule whereas oil behaves as a non-polar molecule. These two molecules do not form a solution as they cannot be mixed up.
Do you believe in ghost
Answer:
well its about our thinking but i do believe in ghost a little
A boat initially moving at a velocity of 20 mph North accelerates to 75 mph North in the span of 10 seconds. What is their average acceleration?
Answer: 5.5 Miles Per Hour Per Second (mph/s)
Explanation:
Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt
Initial speed
20
mph
Final speed
75
mph
Time
10
sec
Acceleration
5.5 mph/s
in physics what is moment of couples?
The moment of a couple is significant in various applications, such as analyzing the equilibrium and rotational motion of objects, understanding the behavior of rotating systems, and studying the effects of torques in mechanics and engineering.
In physics, the moment of a couple, also known as torque, refers to the rotational effect produced by two equal and opposite forces acting on an object but not along the same line of action.
A couple consists of two forces that have the same magnitude, act in parallel lines, and are opposite in direction. These forces create a rotational moment or torque around a particular point, known as the pivot or axis of rotation. The moment of a couple is a measure of the tendency of the couple to rotate an object.
The magnitude of the moment of a couple is given by the product of one of the forces and the perpendicular distance between the lines of action of the two forces. Mathematically, it can be expressed as:
Moment of couple = Force × Perpendicular distance
The SI unit of moment of a couple is the newton-meter (Nm). It is also important to note that the moment of a couple is a vector quantity and follows the right-hand rule for determining its direction.
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If the pendulum completes exactly 12 cycles in 2.0 minutes, what is the frequency of the pendulum
Write an email to a classmate explaining why the velocity of the current in a river has no FN C02-F20-OP11USB effect on the time it takes to paddle a canoe across the river, as long as the boat is pointed perpendicular to the bank CofOthe river.
The velocity of the current in a river has no effect on the the time it takes to paddle a canoe across the river, given that the boat is pointed perpendicular to the bank of the river, because
The velocity of the river does not change the velocity and therefore the distance traveled in the direction of the boat which is directed perpendicular to it
Reason:
Let \(\overset \rightarrow {v_y}\) represent the velocity of the boat across the river in the direction, \(\overset \rightarrow {d_y}\), and let, \(\overset \rightarrow {v_x}\), represent the velocity of the river, we have;
The velocity of the boat perpendicular to the direction of the river = \(\overset \rightarrow {v_y}\)
Therefore, the distance covered per unit time in the perpendicular direction
to the flow of the river is \(\overset \rightarrow {v_y}\), such that the time it takes to cross the river in
the perpendicular direction is the same, for every value of the velocity of
the river.
This is so because the velocity in the perpendicular direction to the flow of
the river, which is the velocity of the boat is unchanged by the velocity of
the river, because there is no perpendicular component of velocity in the
velocity of the river.
\(\overset \rightarrow {v_y}\) = 3 m/s
\(\overset \rightarrow {v_x}\) = 4 m/s
The width of the river, \(w_y\) = 6 meters, we have;
The resultant velocity = \(\sqrt{(3 \ m/s)^2 + (4 \ m/s)^2} =5 \ m/s\)The direction, θ, is given as follows;
\(\theta = \arctan \left(\dfrac{4}{3} \right) \approx 53.13^{\circ}\)
The length of the path of the boat, l, is given as follows;
\(l = \dfrac{6}{cos \left(\arctan \left(\dfrac{4}{3} \right)\right)} = 10\)
The length of the path the boat takes = 10 m
The time it takes to cross the river, t = \(\dfrac{l}{v}\), therefore;
\(t = \dfrac{10}{5} = 2\)The time it takes to cross the river, t = 2 secondsConsidering only the y-components, we have;
\(t = \dfrac{w_y}{v_y}\)
Therefore;
\(t = \dfrac{6 \ m}{3 \ m/s} = 2 \, s\)
Which expresses that the time taken is the same and given that the
vectors of the velocities of the river and the boat are perpendicular, the
distance covered in the direction of the boat is unaffected by the velocity
of the river.
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The position vs time graph below shows the motion of a bee flying in a field over a period of 16.0 s. What is the velocity of the bee between 4.00 s and 8.00 s?
Answer:
v = 2 m/s.
Explanation:
From the given graph, it is clear that the position is bee is 8 m between 4 s to 6 s. It would mean that its displacement is equal to 0 because final position is equal to initial position.
Between 6 s to 8 s, its velocity is decreasing and it is calculated using slope. The slope of position time graph gives velocity of an object.
\(\text{slope}=v=\dfrac{8-4}{8-6}\\\\v=\dfrac{4\ m}{2\ s}\\\\v=2\ m/s\)
So, the velocity of the bee between 4 s to 8 s is 2 m/s.
The Sun converts 6 × 1011kg of hydrogen into helium every second. Only 99.3% (= 0.993) of that goes into helium; the rest, 00.7%, goes into the energy that causes the Sun to shine. So, over the next 5 billion years (= 1.6 × 1017seconds). Calculate the amount of hydrogen that will be converted into helium.
Suppose there are 3 molecules in a container. If each molecule has a 1-in-2 chance of being in the left half of the container, what is the probability that there are exactly 2 molecules in the left half of the container?
Answer:
Total probability = 3/8
Explanation:
Below is the calculation:
Number of molecules in the container = 3
The probability of one molecule in the left half, P = 3 / 2 = 1.5 or 1/2
The probability of second molecule in the left half, P1 = (3/4)
Total probability = P x P1
Total probability = (1/2) x (3/4)
Total probability = 3/8
If the instantaneous voltage at a given moment in the circuit RL is V=VmaxSIN(150), then the instantaneous current at the...... same instant I=Imaxsin
The instantaneous current at the same moment in the RL circuit can be expressed as I = Imaxsin(150), where Imax represents the maximum current.
1. Given that the instantaneous voltage at a specific moment in the RL circuit is V = Vmaxsin(150).
2. We can express the current at the same moment using Ohm's Law, which states that V = IR, where V is voltage, I is current, and R is resistance.
3. In an RL circuit, the resistance is represented by the symbol R, and it is typically associated with the resistance of the wire or any resistors in the circuit.
4. However, the given equation does not explicitly mention resistance.
5. Since we are considering an RL circuit, it suggests the presence of inductance (L) along with resistance (R).
6. In an RL circuit, the voltage across the inductor (VL) can be expressed as VL = L(di/dt), where L is the inductance and di/dt represents the rate of change of current.
7. At any given instant, the total voltage across the circuit (V) can be expressed as the sum of the voltage across the resistor (VR) and the voltage across the inductor (VL).
8. Therefore, V = VR + VL.
9. Since the given equation represents the instantaneous voltage (V), we can deduce that V = VR.
10. By comparing V = VR with Ohm's Law (V = IR), we can conclude that I = Imaxsin(150), where Imax represents the maximum current.
The specific values of Vmax, Imax, and the phase angle have not been provided in the question, so we are working with the general expression.
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Can you share me your answers ❤️❤️
Answer:
Depending, on how much it's push against together.
Explanation:
Since, the two objects are getting in contact. But, if it's a type of item/thing there's a different frictions, but I know it's normal friction when two objects comes in contact. But, its depending on how much you push it against the two items.
1. An MR-2 starts from rest and accelerates westward to a speed of 27 m/s in
11.8 seconds.
a) What is its acceleration?
b) What is the displacement it covered?
Answer:
a) 2.28 m/s²
b) 159.86 m
Explanation:
Part A:
u = 0 m/s
v = 27 m/s
t = 11.8 seconds
a = ?
Formula:
v = u + at
=> 27 = 0 + a(11.8)
=> 27 = a(11.8)
=> a(11.8) = 27
=> a = 27/11.8
=> a = 2.28 m/s²
Part B:
s = ?
Formula:
s = (v² - u²)/2a
s = (27² - 0²) /2(2.28)
= 729/4.56
= 159.86 m
I only need question 12 answered
A vector's length is considered to be its magnitude. A is used to represent the vector's magnitude.
A vector's magnitude can be determined in what ways?|v| =(x2 + y2) is the formula to calculate a vector's magnitude in two dimensions, where v = (x, y). From the Pythagorean theorem, this formula was obtained. In three-dimensional space, the formula to calculate a vector's magnitude is V = (x, y, z).A vector's length is considered to be its magnitude. A is used to represent the vector's magnitude. For more details on a vector's magnitude, see to its introduction. On this page, formulas for the magnitude of vectors in two and three dimensions in terms of their coordinates are developed.To learn more about vector's length refer to:
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The angle measured anticlockwise from the +x axis can be used to find vector components as well. In that instance, the x-component and y-component, respectively, will always be cos and sin.
How do you find the x and y components of a vector given velocity?The components of velocity v x=v cos and v y=v sin, where v is the magnitude of the velocity and is its direction in relation to the horizontal, have magnitudes of v x=v cos and v y=v respectively.Fill in a and b in the formula \(|v|=a_2+b_2 | v |=a_2 + b_2\) for a vector with the values a and b. Step 2: Underly the square root first, and then simplify the square root as much as you can, to simplify the magnitude\(|v|=a_2+b_2 | v |=a_2 + b_2\). Finding the horizontal component requires multiplying the vector's magnitude by the cosine of the vector's angle, and finding the vertical component requires multiplying the vector's magnitude by the sine of the vector's angle.To learn more about vector refer to :
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You throw an object up with a speed of v0y = 9 m/s from a height of y = 25 m.
a) How long, in seconds, does it take for the object to reach the ground?
b) What is the object's final velocity, in meters per second, as it impacts the ground?
c) Find in the time, in seconds, if you instead threw the object down the same velocity, Voy
Answer:
a) 3.36 sec
b) 23.9 m/s
c) 1.52 sec
Explanation:
maximum height
H = 25 +v_y^2/2g
H=25+9^2/2*9.81 =29.13 m
time taken to reach maximum height = t_1 =v_y/g = 9/9.81 =0.92 seconds
time taken to fall back to ground from maximum height = √(2gH)/g
= √(2*9.81*29.13)/9.8 = 2.439 seconds
a) Total time taken to reach ground T = t_1+t_2 =0.92+2.439=3.36 sec
b) objects final speed = √2gH = 23.9 m/s
c) let total time be t then
25 = 9t +0.5gt^2
Solving we get t= 1.52 seconds
a) The object will take a time of 3.355 seconds to reach the ground.
b) The final velocity of the object as it impacts the ground is -23.902 meters per second.
c) The object will take a time of 1.520 seconds to reach the ground.
Kinematics of an object in free fall motion
a) The height of the object (\(h\)), in meters, as a function of time (\(t\)), in seconds, is described below:
\(y = y_{o} + v_{o}\cdot t + \frac{1}{2}\cdot g \cdot t^{2}\) (1)
Where:
\(y_{o}\) - Initial height, in meters.\(v_{o}\) - Initial velocity, in meters per second.Now we proceed to determine the time needed for the object to reach the ground: (\(y_{o} = 25\,m\), \(y = 0\,m\), \(v_{o} = 9\,\frac{m}{s}\), \(g = -9.807\,\frac{m}{s^{2}}\))
\(-4.904\cdot t^{2}+9\cdot t +25 = 0\) (2)
Then, we solve this second order polynomial by quadratic formula:
\(t_{1} \approx 3.355\,s\), \(t_{2} \approx -1.520\,s\)
Only the former solution offers a realistic indicator. Hence, we conclude that the object will take a time of 3.355 seconds to reach the ground.
b) The final velocity of the object (\(v\)), in meters per second, is determined by this expression:
\(v = v_{o}+g\cdot t\) (3)
Now we proceed to find the final velocity of the object as it impact the ground: (\(v_{o} = 9\,\frac{m}{s}\), \(g = -9.807\,\frac{m}{s^{2}}\), \(t \approx 3.355\,s\))
\(v = 9+(-9.807)\cdot (3.355)\)
\(v = -23.902\,\frac{m}{s}\)
The final velocity of the object as it impacts the ground is -23.902 meters per second. \(\blacksquare\)
c) In this part we shall apply the same approach in a), that is: (\(y_{o} = 25\,m\), \(y = 0\,m\), \(v_{o} = -9\,\frac{m}{s}\), \(g = -9.807\,\frac{m}{s^{2}}\))
\(-4.904\cdot t^{2}-9\cdot t +25 = 0\)
Then, we solve this second order polynomial by quadratic formula:
\(t_{1} \approx 1.520\,s\), \(t_{2} \approx -3.355\,s\)
Only the former solution offers a realistic indicator. Hence, we conclude that the object will take a time of 1.520 seconds to reach the ground.
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which of the following best shows the electric potential isolines around a charged sphere and the gravitational potential isolines around a small moon? (objects are not to scale.)
The isolines are always opposite to the electric field vectors in the region around q1q1 and q2q2.
Isolines - The lines known as isolines link points with equal values.
To draw Isolines of Electric Potential :
They are usually closed loops, for oneThey always make a right angle turn to cross the electric field lines.They are prohibited from crossing any other electric potential lines.Where the electric field is stronger.They are closer together.They do not go via a conductor.The isolines are always opposite to the electric field vectors in the region around q1q1 and q2q2.
The isolines are lines that are used on maps for different purposes. They basically connect dots of same values, which can be height, depth, temperature, air pressure. These lines are used on maps as mentioned, and some of them are specialized for representing heights on flat surface, these are the contour lines.
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find the magnitude of the magnetic field that will cause the proton to follow the semicircular path from a to b .
The magnitude of the magnetic field that will cause the proton to follow the semicircular path from A to B is 0.294 T and the direction should be inwards.
According to the attached figure, the proton follows a semicircular path from point A to B. The velocity of proton is Vo = 1.41 x 10^6 m/s. The figure shows that the diameter of the circular path is 10cm, hence the radius of the path is 5 cm or 0.05m. The magnetic force experienced by the proton is balanced by the centripetal force acting on it. The magnetic force is given by qvB and the centripetal force is given by mv^2/r. Hence,
(mv^2)/r=qvB
Where m is the mass of the particle, v is velocity of the particle, r is the radius, q is charge of moving particle and B is the magnitude of magnetic field. Thus
B=mv/rq
Substituting the values,
B=(1.67 x 10^(-27)*1.41 x 10^6)/(0.05*1.602 x 10^(-19) )
B = 0.294 T
Hence, the magnitude of magnetic field is 0.294 T.
Magnetic force at point A should be towards right. Hence, from Fleming's left hand rule magnetic field should be inwards.
Note: The question is incomplete. The complete question probably is: A proton at point A in figure has a speed Vo = 1.41 x 10^6 m/s. Find the magnitude and direction of the magnetic field that will cause the proton to follow the semicircular path from A to B.
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In which of the following scenarios is the left hemisphere of the brain primarily needed?
The left hemisphere of the brain is primarily needed in scenario, Solving a complex mathematical problem. Option a is correct.
The brain is divided into two hemispheres, left and right, and they are specialized for different cognitive functions. The left hemisphere of the brain is primarily responsible for language processing, logical reasoning, and analytical thinking. Solving a complex mathematical problem involves logical reasoning, analytical thinking, and the use of language, all of which are primarily controlled by the left hemisphere of the brain.
Mathematical problems often require precise calculations, sequencing of steps, and the use of symbols and formulas, all of which require a strong left-brain function. In contrast, appreciating a work of art, listening to music, and recognizing facial expressions are all more complex perceptual and emotional processes that involve the right hemisphere of the brain. Option a is correct.
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--The complete question is, In which of the following scenarios is the left hemisphere of the brain primarily needed?
a. Solving a complex mathematical problem.
b. Appreciating a work of art
c. Listening to music
d. Recognizing facial expressions.--
In high air pressure the molecules are
A-Warm and moving fast
b-Close together and moving slowly
c-far apart and moving slowly
d-hot and moving rapidly
define holizoic animals
Holozoic food acquisition is defined by the absorption of complex organic materials in the way of most creatures.
Holozoic nutrition refers to when creatures consume solid food. The food might be either plant-based or animal-based.
An animal ingests complicated organic food stuff into its body, helps to digest it, and then absorbs it into the living organisms in this process.
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Alchemists searched for ways to change lead into gold. Which type of change
must occur for this conversion to happen?
Answer:
It's had to be a Nuclear change since by nuclear fusion we can convert lead to Gold.
Therefore Option B. Nuclear Change is Answer.
By : Modern Einstein
One force that has always on you is the gravitational force on you by earth what is the newtons third law paired to this forth think opposites
c. The normal force on you by earth
The Newton's third law states that, for every action there is equal and opposite reactionhe
A force of 80.0 N is applied by a janitor on the handle of a mop held at 40° angle with the floor. What force is pushing the mop (a) across the floor and (b) downward to the floor?
can someone answer this, thank youuu!
Answer:
Explanation:
Answer:
Explanation:
If we ASSUME that the mop has no acceleration, then the applied force must be acting parallel to the length of the handle.
a) 80.0cos40 = 61.3 N
b) 80.0sin40 = 51.4 N
Which factors affect the gravitational force between two objects?
distance and velocity
O mass and distance
mass and weight
O acceleration and weight
Answer:
mass and distance
Explanation:
I could explain it but I don't know how to word it xd
Answer:
My best guess is:
B) mass and distance
This is because gravity is affected by the size of objects and the distance between objects.
Explanation:
Hope it helps! =D
What kind of wave is formed (transverse or longitudimal wave, pick one) is formed by ripples on a calm pond? With explanation! Please help, most detailed answer will get brainliest and many points.
Answer:
Transverse
Explanation:
It's tranverse because the water molecules are moving repeatedly up and down vertically when the waves move horizontally across the waters surface.
Find the sum of 23.1, 0.98 and 101