The step of the scientific method that involves looking closely at the physical universe for the purpose of gathering knowledge is called observation.
Observation is an essential component of the scientific method and involves the collection of data through the use of the senses, instruments, or other methods. The goal of observation is to gather accurate and reliable information about the natural world, which can then be used to develop hypotheses, test theories, and ultimately deepen our understanding of the universe.
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true or false? you exert a push p on an object and it pushes back on you with a force f. if the object is moving at constant velocity, then f is equal to p, but if the object is being accelerated, then p must be greater than f.
It is true that if you exert a push p on an object and it pushes back on you with a force f. if the object is moving at constant velocity, then f is equal to p, but if the object is being accelerated, then p must be greater than f.
Force is a physical quantity that describes the interaction between two objects. It is a vector quantity, meaning it has both magnitude and direction. Force is responsible for changes in an object's motion, such as acceleration, deceleration, and changes in direction. The force exerted on an object is equal to its mass times its acceleration. There are many types of forces, including gravitational forces, electromagnetic forces, and nuclear forces, among others. In physics, force is described by Newton's laws of motion, which state that the acceleration of an object is proportional to the net force acting on it, and that the net force on an object is equal to the sum of all the forces acting on it.
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why do your hands not get warm when rubbing them with soapy water?
Answer:
Explanation:
because you are rubbing the soap not your hands so the soap takes up the energy rahter than the hands
Show how to balance 3 masses hanging from a force table. (There is not a fourth mass to add). The masses are 3 kg, 4 kg, and 6 kg. You need to indicate the angles between the strings that will cause all of the masses to be all be in equilibrium.
Assuming the force table is set up so that the masses are placed at the vertices of an equilateral triangle, the angles between the strings should be 60 degrees.
How to balance 3 masses hanging from a force table?This will cause all of the masses to be in equilibrium.The angles between the strings can be calculated using the following formula:Angle = arccos ((m1*m2) / (m3*(m1+m2))) For this problem, the angles between the strings will be:Angle 1 = arccos ((3*4) / (6*(3+4))) = arccos (0.8) = 61.93° Angle 2 = arccos ((3*6) / (4*(3+6))) = arccos (0.75) = 56.31°Angle 3 = 180° - (Angle 1 + Angle 2) = 180° - (61.93° + 56.31°) = 61.76°Assuming the force table has four support points, the three masses can be balanced by adjusting the angles between the strings. To do this, the three masses must be arranged as far as possible from one another, with the 3 kg mass in the center and the other two masses, 4 kg and 6 kg, on the outside. To begin, the 4 kg mass should be suspended to the left of the 3 kg mass, and the 6 kg mass should be suspended to the right. The angle between the strings should be adjusted so that the 4 kg mass is suspended at an angle of 25 degrees, and the 6 kg mass is suspended at an angle of 155 degrees. This will ensure that the three masses are balanced, with the force exerted by the 4 kg mass equal to the force exerted by the 6 kg mass. To achieve equilibrium, the 3 kg mass should be suspended at an angle of 90 degrees from the 4 kg mass, and the 6 kg mass should be suspended at an angle of 90 degrees from the 3 kg mass. This will ensure that the forces acting on the 3 kg mass are equal, and the forces acting on the 4 kg and 6 kg masses are equal. This will result in a balanced system.To learn more about the force table refer to:
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which type of 3d imaging technique visualizes a structure as if it were hollow and the viewer were inside of it.
Volumetric visualization type of 3d imaging techniques visualizes a structure as if it were hollow and the viewer was inside of it.
This type of 3D imaging technique is called volumetric visualization or volume rendering. It is a process of creating 3D images from data sets that represent the volume or density of a physical object.
The technique creates images by taking into account the volume of the object and simulating the light transmission through it, allowing the viewer to see the structure as if it were hollow and the viewer was inside it.
This is useful in many fields, such as medical imaging, where it allows physicians to visualize the internal structures of a patient's body in a non-invasive way.
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true or false: the remanent magnetization of a material is its level of permanent, internal magnetization in no applied magnetic field.
The given statement is that Remnant magnetization of a material is its level of permanent, internal magnetization in the absence of an applied magnetic field, is true.
The remnant magnetization (or remnant magnetization) of a material is its level of permanent internal magnetization in the absence of an applied magnetic field. It is the magnetization that remains in a magnetic material after the removal of an external magnetic field. Remnant magnetization is an important property in magnetic recording, electromechanical systems, and many other applications.
A magnetic field is a field produced by moving electric charges or by a permanent magnet that generates a force on other magnets or moving charges within the field.
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How high would you have to lift a 1000 kg car to give it a potential energy of: a. 2,000 J (b) 200,000 J
Given:
a. 2,000J
b. 200,000 J
Answer:
a. 0.204 m, b. 20.408 m
Explanation:
We know that Potential energy is given by
[tex]U = mgh[/tex]
Rearranging this, we have:
[tex]h=U/mg[/tex]
a. 2000 J = 2000 kgm/s²
h = 2000/(1000*10) (Taking g = 10 m/s²)
= 0.2 m
If we took g as 9.8 m/s²,
h = 0.204 m (Marginal error)
b. 200,000 J = 200,000 kgm/s²
h = 200,000/(1000*10) (Taking g = 10 m/s²)
= 20 m
If we took g as 9.8 m/s²,
h = 20.408 m
Gasoline is piped underground from refineries to major users. The flow rate is 3.00×10–2 m 3 /s (about 500 gal/ min), the viscosity of gasoline is 1.00×10–3 (N/m2 ) ⋅ s , and its density is 680 kg/m3 . (a) What minimum diameter must the pipe have if the Reynolds number is to be less than 2000? (b) What pressure difference must be maintained along each kilometer of the pipe to maintain this flow rate?
The minimum diameter must the pipe have if the Reynolds number is to be less than 2000 is 13m and the pressure difference is 4.3×[tex]10^{-5}[/tex]Pa.
The volume flow rate equation can be used to get the equation for flow velocity as
The phrase "volume flow rate" in physics refers to the amount of matter that travels through space in terms of physical dimensions rather than mass per unit of time. For instance, when you turn on the kitchen faucet, a certain volume of water (measured in fluid ounces, litres, or another unit) flows out of the orifice in a certain amount of time (usually seconds or minutes). The volume flow rate is referred to as this amount.
Solids do not "flow," even if they may also move through space at a regular rate. Liquids and gases almost always have what is referred to as a "volume flow rate."
V=Av
v=[tex]\frac{V}{A}[/tex]
v=[tex]\frac{V}{\pi r^{2} }[/tex]
The diameter may now be calculated using the Reynolds number equation as
[tex]N_{R}=\frac{2\rho vr}{n}[/tex]≤2000
[tex]N_{R}=\frac{2\times680\times \frac{V}{\pi r^{2} }}{n}[/tex]≤2000
[tex]N_{R}=\frac{2\times680\times \frac{3\times 10^{-2} }{\pi r }}{1\times10^{-3} }[/tex]
r≥6.5
[tex]\frac{d}{2}[/tex]≥6.5
d≥13m
To find the pressure difference use the relationship given below
[tex]V=\frac{\triangle P \pi r^{2} }{8nL}[/tex]
[tex]3\times10^{-2} =\frac{\triangle P \times 3.14\times 6.5^{2} }{8\times 1\times 10^{-3}\times 1000 }[/tex]
Now, after solving we get
[tex]\triangle P[/tex]=4.3×[tex]10^{-5}[/tex]Pa
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pavlina does not consider the other cars that she has seen speeding when she says that people in red cars are much more likely to speed.
Pavlina does not consider the other cars that she has seen speeding when she says that people in red cars are much more likely to speed. This illustrate Present or Present bias.
Speed is a scalar quantity, whereas velocity, which includes both magnitude and direction definitions, is speed's vector form. Speed is expressed as either the average speed for the entire distance travelled or the instantaneous speed at that specific moment.
Speed can also be described in terms of a period of time or a distance, and it can change with time. Speed is defined as the rate at which an object's position changes.
In everyday usage, we refer to speed as the amount by which an object moves, while in science, speed is defined as the rate at which an object changes its location in relation to time.
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Complete Question:
Pavlina does not consider the other cars that she has seen speeding when she says that people in red cars are much more likely to speed. What type of bias does this illustrate?
if an astronaut throws a ball in space with the initial velocity of 3.0 meters per second to the west, what will the ball's velocity be in a year?
In a vacuum, the velocity of an object thrown in space remains constant unless acted upon by an external force. Thus, the ball's velocity will still be 3.0 meters per second to the west after a year.
In the absence of external forces, the velocity of an object remains constant according to the law of conservation of momentum. This applies to objects in space, where there is no friction or air resistance to slow it down. Therefore, if an astronaut throws a ball with an initial velocity of 3.0 meters per second to the west, it will continue to move in that direction with the same velocity, 3.0 meters per second, one year later. This is assuming no other external forces, such as gravitational forces from nearby celestial bodies, are acting upon the ball.
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a car is traveling at a speed of 34 m/s. (a) what is its speed in kilometers per hour? km/h
The car is traveling at a speed of 34 m/s. Its speed in kilometres per hour is calculated to be 122.4 km/h.
Speed is the rate at which an object's position shifts in any direction.
By dividing the distance by the time, one may calculate speed. Calculating the units for speed requires knowledge of the units for both time and distance. The units in this example will be meters per second (m/s), due to the fact that the distance is expressed in metres (m) and the time is expressed in seconds (s).
1 h = 3600 s
1 km = 1000 m
s₂ = (34 m/s) × (60×60)/1000
⇒ 122.4 km/h
s₂ = 122.4 km/h
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the net electric flux crossing an open surface is never zero. true or false?
The given statement that net electric flux crossing an open surface is never zero, is false.
The net electric flux of an electric field through a closed surface is equal to the enclosed charge, divided by the permittivity of the free space. Where charge is taken in the unit of coulombs.
The net electric flux cross an open surface can also be zero if the is perpendicular to the direction of the field. In other word if the field lines are parallel to the surface. Electric flux is a scaler quantity. The SI unit of electric flux is N-m²/C.
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a lightning bolt strikes a tree, moving 23.36 c of charge through a potential difference of 142 mv. what energy was dissipated? 1mv
Without knowing t, we cannot calculate the current, and thus the energy dissipated.
When a current of I coulombs per second flows across a potential difference of V volts, the rate of energy dissipation is IV, which may alternatively be represented as I2R or V2/R (using Ohm's law).
The energy dissipated by a lightning bolt can be calculated using the equation P = IV,
where P is the power (energy per unit time),
I is the current, and
V is the potential difference.
Given that the lightning bolt moved 23.36 coulombs of charge through a potential difference of 142 millivolts,
we can calculate the current as follows:
I = Q / t
where t is the time it takes for the charge to flow, which is not specified.
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a solution is made by diluting 37 ml of a 10.25 mol/l standard solution to a volume of 2.40 l. what is the concentration of the resulting solution?
After dilution the concentration of the resulting solution will become 0.1621875 mol/l.
To find the concentration of the resulting solution, we need to calculate the number of moles of solute in the final solution and then divide by the total volume of the solution.
First, we find the number of moles of solute in the original 37 ml solution:
moles = concentration x volume
moles = 10.25 mol/l x (37 ml / 1000 ml/l)
moles = 0.39225
Next, we use the volume of the final solution to find the new concentration:
concentration = moles / volume
concentration = 0.39225 / (2.40 l)
concentration = 0.1621875 mol/l
The concentration of the resulting solution is 0.1621875 mol/l.
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2.if 20 pounds of ice starts at fifteen degrees and is changed to steam at 425 degrees in one hour how many btuh are required?
If 20 pounds of ice starts at fifteen degrees and is changed to steam at 425 degrees in one hour. The total amount of energy required is 21000 BTUs/hr.
To calculate the amount of energy required to change 20 pounds of ice at 15 degrees to steam at 425 degrees in 1 hour, you need to determine the heat of fusion and the heat of vaporization.
Heat of fusion: 80 BTUs/lb
Heat of vaporization: 970 BTUs/lb
So, the total amount of energy required is: 20 x (80 + 970) = 20 x 1050 = 21000 BTUs/hr.
Energy change refers to the difference in the amount of energy contained in a system before and after a process has taken place. It can refer to an increase in energy (endothermic) or a decrease in energy (exothermic). For example, the energy change during a chemical reaction or a physical process such as melting or boiling can be calculated by determining the heat absorbed or released during the process.
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Which is the formula that describes the magnitude of an
momentum?
object's
Answer:
The magnitude of the momentum of an object is p = mv.
Explanation:
Here, m is the mass of the object and v is the velocity of the object. This quantity attributes both quantities, and is defined by Newton as the product of them.
a light bulb requires a current of 0.70 a to emit a normal amount of light. if the light is left on for 1.0 h, what is the number of electrons that pass through the bulb?
The number of electrons that pass through the bulb is 0.4375 x 10^19C when a light bulb requires a current of 0.70 a to emit a normal amount of light.
Given the current required for a light bulb (I) = 0.7A
Time for which light is left on (t) = 1h = 3600s
Let the number of electrons that pass through the bulb = n
We know that I = Q/t where Q is the charge flowing through the bulb.
Current is expressed as charge per unit time.
So, Q = I x t = 0.7 x 3600s = 2520C
We know that the charge on an electron (qe) = 1.6X10^-19C
Then, n = I/ 1electron charge = 0.70 / 1.6X10^-19
n = 0.4375 x 10^19C
Hence, the number of electrons that pass through the bulb is 0.4375 x 10^19C.
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determine the proper units for momentum using dimensional analysis. (b) the unit of force is the newton n, where 1 n 5 1 kg ? m/s2 . what are the units of momentum p in terms of a newton and another fundamental si unit?
The unit of momentum is kg-m/sec, and the unit of momentum in terms of Newton is N-s.
The momentum of an object is the vector product of the mass of the object and its velocity. It is denoted by P. It is a vector quantity.
P = mv
So its unit will be (kg) × (m/s) = kg-m/s
We also know that the time rate of change of momentum is called force,
F = ΔP/Δt
ΔP = FΔt = Force × change in time
So the SI unit of momentum in terms of Newton will be, N × Sec = N-s
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a 12-volt electric motor has 1,000 watts input and 1 horsepower output. maintaining the same efficiency, how much input power will a 24-volt, 1-horsepower electric motor require? (note: 1 horsepower
The electric motor will require 1,000 watts input power. The result is obtained by comparing the formula for efficiency.
What is efficiency?Efficiency of an engine can be expressed as
η = P out/ P in
Where
P out = output powerP in = input powerPower is the amount of energy per unit of time.
An electric motor has
V = 12 VoltP₁ in = 1,000 wattsP₁ out = 1 horsepowerWith the same efficiency, the electric motor has
V = 24 voltP₁ out = 1 horsepowerFind output power! (P₂ in = ?)
1 horsepower = 746 watts
The efficiency is the same
η₁ = η₂
P₁ out/ P₁ in = P₂ out/ P₂ in
1 hp/ 1,000 watts = 1 hp/ P₂ in
P₂ in = 1,000 watts
Hence, the required input power of the electric motor is 1,000 watts.
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A certain household has consumed 250 units of energy during a month. How much energy is this in joule?
Answer:
The Answer is 9×10^8J
Explanation:
unit of energy is equal to 1 kilowatt hour (kWh).unit of energy is equal to 1 kilowatt hour (kWh).1 unit = 1 kWhunit of energy is equal to 1 kilowatt hour (kWh).1 unit = 1 kWh1kWh=3.6×106Junit of energy is equal to 1 kilowatt hour (kWh).1 unit = 1 kWh1kWh=3.6×106JTherefore, 250 units of energy =250×3.6×106=9×10^8J.Instead of following the EOQ prescription of 150 pieces/order, a company orders 100 pieces at a time. This action would typically result in: Higher total ordering cost and higher total holding cost Higher total ordering cost, but lower total holding cost Lower total ordering cost, but higher total holding cost Lower total ordering cost and lower total holding cost
In accordance with Economic Order Quantity (EOQ), this action would typicaly result in higher total order cost but lower total holding cost.
Many businesses place orders for products based on what they actually need at the time, rather than using a reorder quantity calculation. Instead, businesses should use the Economic Order Quantity method to simplify the way they place orders and pay for goods (EOQ). The EOQ formula assists online retailers in determining the optimal order quantity to save on logistics and warehousing costs. Calculating EOQ allows one to more effectively decide how much product to order in a given time frame. The EOQ formula is made up of three components: holding costs, demand, and order costs. The economic order quantity is the optimal number of units to purchase in order to meet demand while minimizing inventory expenses such as holding costs, shortage costs, and order costs (EOQ).
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Which would the community health nurse be least likely to include when designing a community-based program within the context of a global framework?
A) Population
B) Provider
C) Procedure
D) Physician
Physician community health nurse be least likely to include when designing a community-based program within the context of a global framework. Correct option is A.
The community health nurse, when designing a community-based program within the context of a global framework, is least likely to include the physician. Community health nurses work with individuals, families, and communities to promote health and prevent disease. They focus on educating and empowering people to make informed health decisions, and engage in activities such as disease screening, health promotion, and environmental health assessments. Community health nurses may collaborate with other healthcare providers, including public health departments, community organizations, and schools, but physicians are typically not involved in the design and implementation of community-based health programs. The focus of a community health nurse's work is on the community, not individual medical care.
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A baseball is thrown up in the air from an initial height of 6 feet. Its height above the ground (in feet) t seconds after being thrown is given by the function h(t)=-16t²+46t+6. How long will it take (in seconds) for the baseball to hit the ground? a) 4 seconds b) 5/2 seconds
c) 2 seconds
d) 3 seconds
From a starting height of six feet, a baseball is hurled upward. Its height above the ground (in feet) t seconds after being thrown is given by the function h(t)=-16t²+46t+6. It take 2 seconds for the baseball to hit the ground. Hence, the correct option is (c).
The baseball hits the ground when the height is 0. Thus, solving h(t)=-16t^2 + 46t + 6 = 0:
-16t^2 + 46t + 6 = 0
Using the quadratic formula:
t = (-b ± √(b^2 - 4ac)) / 2a
Where a = -16, b = 46, c = 6
t = (-46 ± √(46^2 - 4 x -16 x 6)) / 2 * -16
t = (-46 ± √(46^2 + 384)) / -32
t = (-46 ± 2√190) / -32
t = (46 ± 2√190) / 32
t ≈ 2 seconds
So, the baseball will hit the ground approximately 2 seconds after it was thrown.
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For an infinitely large plane wall with thickness L, assuming 1D heat transfer, what can you say about the rate of heat conduction?
A. It is a constant everywhere.
B. It is a constant along the plane normal to the direction of heat transfer, but varies along the direction of heat transfer.
C. It varies in time.
D. None of the above.
None of the given option is correct about the rate of heat transfer through an infinitely large plane wall of length L.
The rate of heat transfer is directly proportional to the area of the surface and the temperature different between the two sides of the object.
Q/t = -KAdT/dx
Here K is the constant depends upon the type of material, A is the area of surface, and dT/dx is the temperature gradient. So we cannot say that it is constant everywhere, because as the heat getting transfer other side the temperature gradient will go on decreasing. In addition to this it is not constant along the plane. Also it does not varies with time. So option D is correct.
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explain the arrangements of molecular magnets in a magnet and in a magnetic substance
: Molecular magnet can refer to : molecular based magnet . An unconventional magnetic material that consists of organic molecules cordination compounds and combination
218 cm3 solid has a mass of 0.0169 kg . when calculating its density what is the appropriate number of significant figures?
The density of the solid is: 0.77 g/cm3
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
The formula and the procedure we will use is:
d = m/v
Where:
v= volumed= densitym= massInformation about the problem:
m = 0.0169 kgv = 218 cm3d = ?By converting the mass from (kg) to (g) we have:
m = 0.0169 kg * 1000 g/ 1 kg
m= 16.9 g
Applying the density formula we get:
d = m /v
d = 16.9 g/218 cm3
d = 0.77 g/cm3
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Determine the magnitude of the Coulomb force on the tape using the value of tan θ and your equation from the previous exercise for FCoulomb.FCoulomb = .40 x 10^-3 N
The magnitude of the Scotch tape is 13 0.05 cm, and the linear mass density (d) is 1.44 0.01 g/m.
Given that the length of the Scotch tape is 13 0.05 cm and the linear mass density (d) is 1.44 0.01 g/m, the answers to the following questions calculate the coulomb force, the number of atoms, and the elementary charges.
where r is the distance between the charges, Q1 and Q2 are the magnitudes of the charges on the two pieces of tape, and k is Coulomb's constant. Given that F Coulomb is equal to 0.40 x 10-3 N, we can use the following equation to find the charge, Q: where is the static friction coefficient, which was determined in the preceding exercise.
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describe how an electron can move to a higher energy state by absorbing a fixed quantum of energy. describe how an electron can move to a lower energy state by releasing a fixed quantum of energy.
Bohr proposed a concept in which electrons would move around in shells, with each shell containing a different number of electrons with a fixed amount of energy. Energy is lower in the lower shell and more in the upper shell. When an electron moves from a lower shell to a higher shell, it loses energy in the process. It must absorb energy.
The ground state is the lowest energy level an electron can have. An increased number of orbitals indicates a more excited state. The greater the electron's excitation state, the greater its energy. An electron will "jump" to a higher orbital when it absorbs enough energy. In this form, the system is said to be in an excited state. An electron in an excited state can "fall" to a less excited state by releasing energy. In doing so, it emits a photon, a discrete packet of electromagnetic energy. The energy of that photon is proportional to the gap between the electron's two states. The electron loses its ability to emit photons when it enters the ground state, but it retains the ability to absorb energy quanta and enter higher excitation states (higher orbitals).
The electron's freedom of motion is proportional to the number of energy levels it can experience. There is exactly one potential state transition between a single ground state and a single excitation state. Electrons can gain enough energy to enter the excited state by absorbing a single quantum of energy. Upon decaying from its excited state, the electron releases a photon of a constant energy equal to the energy it lost upon entering the lower orbital.
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Which one does NOT force air parcels to rise? orographic processes advection frontal movement convection
Orographic processes are the ones which does not force the air parcels to rise up.
Orographic processes refer to how mountains and hills affect regional and global weather patterns. Mountains can considerably increase precipitation locally and produce a wide range of intricate flows, a few of which are accompanied by dangerous winds and violent turbulence.
Advection is the movement of a fluid in a bulk manner to transfer a substance or amount in the fields of physics, engineering, and earth sciences. It carries the characteristics of that substance with it. The bulk of the advected substance is often a fluid as well.
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when the motorcyclist is at a , he increases his speed along the vertical circular path at the rate of v˙=(0.04s)ft/s2 where s is in ft . take rho = 300 ft . determine the magnitude of his velocity when he reaches B. Also, what is his initial acceleration?
The magnitude of his velocity when he reaches at B is 15 ft/s, and his initial acceleration of the motorbike is 0.00013333 ft/s^2.
Given that :-
The radius of the circular path is r = 300 ft,
and the rate of increase of speed is v˙ = 0.04s ft/s^2.
The initial acceleration a_0 of the motorcyclist can be determined by using the formula:-
=> a = v˙ / r,
Hence,
=> a_0
= v˙ / r
= 0.04 s ft/s^2 / 300 ft
= 0.00013333 ft/s^2
At point B, the magnitude of velocity v can be determined by using the formula:-
v = sqrt(v_0^2 + 2 x a_0 x r),
here v_0 is initial velocity.
Since the initial velocity is not given,
let's assume,
v_0 = 0.
Hence,
=> v = sqrt(v_0^2 + 2 x a_0 x r)
= sqrt(0^2 + 2 x 0.00013333 x 300)
= 15 ft/s
Therefore, the magnitude of the velocity at point B is 15 ft/s, and the initial acceleration of the motorcyclist is 0.00013333 ft/s^2.
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A sample of argon gas occupies a volume of 950 mL at 25°C. What volume will the gas occupy at 50°C if the pressure remains constant?
The required volume of the gas when pressure remains constant is calculated to be 1029.65 ml.
Charles law gives the relation between temperature and volume when the pressure of the gas is kept constant.
Mathematically, it is given as,
V₁/T₁ = V₂/T₂
It is given that the sample of argon gas occupies 950 mL at 25°C.
So, V₁ = 950 ml
T₁ = 25°C = 25 + 273.15 = 298.15 K
The volume of the gas occupied at 50°C is to be found out.
V₂ = ?
T₂ = 50°C = 50 + 273.15 = 323.15 K
Placing all the values in the above equation, we have,
V₁/T₁ = V₂/T₂
950/298.15 = V₂/ 323.15
V₂ = 950/298.15 × 323.15 = 1029.65 ml
Thus, the required volume is calculated to be 1029.65 ml.
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