What was the acceleration of the javelin during the throw? Assume that it has a constant acceleration. Express your answer to two significant figures and include the appropriate units. A javelin thrower standing at rest holds the center of the javelin behind her head, then accelerates it through a distance of 70 cm as she throws. She releases the javelin 2.0 m above the ground traveling at an angle of 30° above the horizontal Top-rated javelin throwers do throw at about a 30 angle, not the 45 you might have expected because the biomechanics of the arm allow them tothrow the javelin much faster at 30 °than they would be able to at 45. In this throw, the javelin hits the ground 55 m awayRequired:What was the acceleration of the javelin during the throw? assume that it has a constant acceleration?
Answers
Let the speed with which the javelin was thrown be u Angle of throw (θ) = 30°,Vertical acceleration (ay) = -9.8 m/s2,Distance over which the javelin was accelerated before throwing (S) = 70 cm = 0.7 m, a = 418.22 m/s2.
How is the javelin throw calculated?The throw's length is calculated by measuring it to the closest centimeter from the mark's location to the inner surface of the scratch line (the runway opposite of the line).The javelin mark that is closest to the scratching line should be where the zero side of the tape is placed.
What physical principles govern javelin throw?The drag force as well as the lift force are the forces pushing against the javelin as it moves.The lift force operates vertically to the axis of the flight, whereas the drag force generally functions as a resistive force or acts against the path of the flight.
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Related Questions
What scale can I use for two force 0.8 Newtons and 0.9 Newtons? Someone please help
Answers
Answer:
Explanation:
To plot the given forces of 0.8 N and 0.9 N. It is convenient to take
0.1 N as 1 unit in Graph
For example, 1 unit in the graph is 1 cm
then take 0.1 N equivalent to 1 cm
\(0.8 N\equiv 8\ \text{units in graph}\\\\0.9\equiv 9\ \text{units in graph}\)
what cement produces bright-red and yellow colors in some sandstones?
Answers
Iron oxide cement produces bright-red and yellow colors in some sandstones.
The coloration in sandstones is often influenced by the presence of different minerals and pigments in the cement that binds the sediment grains together. Iron oxide, specifically hematite (Fe2O3) and goethite (FeO(OH)), is a common cementing material found in sandstones. When present in higher concentrations, these iron oxide minerals can impart bright-red and yellow hues to the sandstone.
The colors of iron oxide cement in sandstones are a result of the selective absorption and reflection of light. Hematite and goethite have specific light absorption properties that allow them to absorb certain wavelengths of light, particularly in the blue and green regions of the visible spectrum. As a result, the sandstone appears red or yellow, as these colors are the wavelengths of light that are not absorbed and are instead reflected or transmitted.
The specific shades and intensity of red and yellow colors in sandstones can vary depending on factors such as the concentration of iron oxide minerals, grain size, and the presence of other minerals or impurities. Different geological processes and environmental conditions during the formation of sandstones can contribute to the variation in coloration.
The bright-red and yellow colors observed in some sandstones are typically caused by the presence of iron oxide cement, specifically hematite and goethite. The selective absorption and reflection of light by these minerals result in the sandstone appearing red or yellow. The exact coloration may vary based on factors such as the concentration of iron oxide, grain size, and geological processes involved in the sandstone's formation.
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differentiate between earthworm and housefly
Answers
Answer:
Earthworm lives in the soil, eats the soil which has organic matter such as decaying vegetation or leaves and crawls. While housefly lives in dirty places, feeds on faeces and flies.
Hope I get a brainliest answer.
a) A cell of dry air is moved vertically from its original position under adiabatic conditions. Depending on the temperature profile of the surrounding atmosphere, this gas cell can keep on moving in the same direction, or it may come back to its original position. Considering the temperature profile of the atmosphere, change of the air cell temperature as it moves up and down in the surrounding atmosphere, as well as relative densities of the air cell and atmosphere, explain why and when the atmosphere is considered to be convectively stable and convectively unstable. In answering this question, use diagrams of temperature change with altitude. (13 marks) b) Explain why the adiabatic lapse rate of dry air is different from the adiabatic lapse rate of wet saturated air. Show them both in a diagram. (5 marks) c) Wet unsaturated air rises from the ocean surface. The ambient lapse rate is higher than the adiabatic lapse rate for dry air. There is a temperature inversion layer at higher altitudes. Show in a schematic diagram how the temperature of the wet air changes with altitude, in comparison with the ambient temperature. Explain at what altitudes the cumulus clouds are formed and why. (7 marks)
Answers
The question addresses the stability of the atmosphere and the factors that determine convective stability or instability. It also explains the difference between the adiabatic lapse rate of dry air and wet saturated air.
a) The stability of the atmosphere is determined by the temperature profile and relative densities of the air cell and atmosphere. If the temperature of the surrounding atmosphere decreases with altitude at a rate greater than the adiabatic lapse rate of the air cell, the atmosphere is considered convectively stable.
In this case, the air cell will return to its original position. Conversely, if the temperature of the surrounding atmosphere decreases slower than the adiabatic lapse rate of the air cell, the atmosphere is convectively unstable. The air cell will continue moving in the same direction.
b) The adiabatic lapse rate refers to the rate at which temperature decreases with altitude for a parcel of air lifted or descending adiabatically (without exchanging heat with its surroundings). The adiabatic lapse rate of dry air is higher (around \(9.8^0C\) per kilometer) compared to the adiabatic lapse rate of wet saturated air (around 5°C per kilometer).
This difference arises because when water vapor condenses during the ascent of saturated air, latent heat is released, reducing the rate of temperature decrease. A diagram can illustrate the difference between the two lapse rates, showcasing their respective slopes.
c) When wet unsaturated air rises from the ocean surface, its temperature decreases at a rate equal to the dry adiabatic lapse rate. However, if the ambient lapse rate (temperature decrease with altitude) is higher than the adiabatic lapse rate for dry air, a temperature inversion layer forms at higher altitudes.
In this inversion layer, the temperature increases with altitude instead of decreasing. A schematic diagram can depict the temperature changes of the wet air in comparison to the ambient temperature, showing the inversion layer.
Cumulus clouds form at the altitude where the rising moist air reaches the level of the temperature inversion layer. These clouds are formed due to the condensation of water vapor as the air parcel cools to its dew point temperature.
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The object in green is currently hung at an angle and the system is in equilibrium. However, if the object in green hangs perpendicular to the lever arm, how would the net torque of the system change, if at all
Answers
If the object in green hangs perpendicular to the lever arm, the net torque of the system would be zero.
The system is in equilibrium, which means the net force acting on the system is zero. When the object in green hangs at an angle, the force due to gravity on the object has two components: one that is perpendicular to the lever arm and one that is parallel to it. The perpendicular component contributes to the torque of the system, while the parallel component does not.
However, when the object in green hangs perpendicular to the lever arm, the force due to gravity on the object is entirely parallel to the lever arm, and there is no perpendicular component to contribute to the torque. Therefore, the net torque of the system would be zero.
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Which two chemists organized elements based on properties such as how the elements react or whether they are solid or liquid?
Lavoisier and Mendeleev
Döbereiner and Newlands
Newlands and Mendeleev
Lavoisier and Döbereiner
Answers
Answer:
The chemists that organized elements based on properties such as how the elements react or whether they are solid or liquid are Lavoisier and Dobereiner
Lavoisier basis of theory is on the various properties of metals, nonmetals and gases.
Dobereiner gave the law of triads. In this theory the middle element is the average of the other two elements.
Answer:
d. Lavoisier and Döbereiner
Explanation:
8. What is the force of attraction between a 20,000 kg truck and a 3,200 kg car when separated by 4 meters? a. 0.0003 N b. 0.5 N c. 9.8 m/s/s d. 10 N
Answers
When separated by 4 meters, the 20,000-kilogram truck and the 3,200-kg automobile are attracted to one other with a force of attraction of roughly 0.0000016748 N. The right response in this case is option A.
Newton's rule of universal gravitation, which says that the force between two things is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers, may be used to compute the force of attraction between two objects. The equation can be written mathematically as:
F = G * (m1 * m2) / r^2
Where:
F is the gravitational constant, while G is the force of attraction.
The two objects' masses are m1 and m2, and their separation from one another's centers is r.
In this instance, the truck weighs 20,000 kg, whereas the automobile weighs 3,200 kg. They are 4 meters apart from one another.
With these values entered into the formula, we obtain:
F = (6.674 × 10^-11 N(m/kg)^2) * (20,000 kg * 3,200 kg) / (4 m)^2
F = 1.6748 × 10^-6 N
Therefore, at a distance of 4 meters, the force of attraction between the 3,200-kilogram automobile and the 20,000-kg truck is roughly 0.0000016748 N.
Option A is therefore the one that comes the closest to this value, at 0.0003 N.
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PLEASE HELP, i really need the help because i dont understand
Answers
The y-component of the vector is 4.97 m.
What is a vector?A vector is a quantity that has both magnitude and direction.
To calculate the y-component of the vector in the diagram above, we use the formula below.
Formula:
Y = Hcos∅.......... Equation 1From the question,
Given:
H = 22.3 m∅ = 77.1°Substitute these values into equation 1
Y = 22.3(cos77.1)Y = 22.3×0.223Y = 4.97 m.Hence, the y-component of the vector is 4.97 m.
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2. Determine the moment of inertia of the shaded area about the x axis using the method of integration. Show the elemental area on your FBD.
ya 20
Answers
The moment of Inertia in the shaded area will be 4.266 \(ln^{4}\)
Consider the equation for the curve
\(y^{2} =x\)
\(y= x^{1/2}\)
Draw the free-body diagram showing the differential elements of the shaded area mentioned in the figure below.
Consider a rectangular different element with respect to the x-axis with a thickness dx and interacts with the boundary at (x, y)
Express the area of the differential, element parallel to the y-axis.
dA=Ydx
Calculate the moment of Inertia of different elements about the X -axis.
Calculate the movement of inertia of the different elements about X -the axis
dIx= dIx+dA\(y^{2}\)
The moment of Inertia of the element about the centroidal axis.
dIx=1/12(dx)\(y^{3}\)
From the moment of inertia of different elements about x-axis,
dIx=1/12(dx)y³+\({\frac{y}{2}}^{2}\)
=1/3\(y^{3}\)dx
=1/3\(x^{3/2}\)dx
From the moment of Inertia for the shaded area about X -a xis.
Ix=∫dIx
= ₄⁰∫ 1/3\(x^{3/2}\).dx=2/15.x \(x^{5/2}\)₄⁰∫
=4.266\(In^{4}\)
Therefore, the moment of Inertia will be =4.266\(In^{4}\).
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A tennis ball rolls off the edge of a table. the table is 0.55m tall and the tennis ball lands 0.12m away from the table.
Answers
Answer:
v = 0.363 m/s
Explanation:
Given that,
The table is 0.55m tall and the tennis ball lands 0.12m away from the table.
Here, u = 0 (at rest) for initial vertical velocity as it rolls off the edge of a table.
Let t is the time to fall from the vertical height. So,
\(h=ut+\dfrac{1}{2}at^2\\\\t=\sqrt{\dfrac{2h}{g}} \\\\t=\sqrt{\dfrac{2\times 0.55}{9.8}} \\\\t=0.33\ s\)
It can be assumed to find the initial horizontal velocity of the tennis ball. It can be given by :
\(v_x=\dfrac{x}{t}\\\\v_x=\dfrac{0.12}{0.33}\\\\v_x=0.363\ m/s\)
Hence, the initial horizontal velocity is 0.363 m/s.
Explain how the readings on both meters change when the environmental conditions change.
Help please :'0
Answers
Answer:
* Temperature changes
* Changes in the tension
* Errors in the meter marks
Explanation:
When we are using several meters to make a measurement we have several aspects that can cause the readings to differ.
* Temperature changes make the dilation between readings different, at higher temperatures the material of the meter expands and the reading decreases.
* Changes in the tension with which the meter is pulled to keep it straight, in general all materials bend under the action of gravity, so you have to pull them to make them straight, if the forces are different from the material is lengthened decide Young's modulus, inducing different readings
* Errors in the meter marks, especially in the initial part that is covered by a hook, different positions of the hook change the readings.
* Structural problems, such as rust, bends that create changes in the length of the meter material.
Why do you see a rainbow when you look at white light through a prism?
please don't send links or files
Group of answer choices
components of white light (colors) were refracted into different amounts by the prism.
different colored of atoms passed through the prism and were knocked out.
the white light’s energy was diverted and converted into visible light.
the prism converted ultraviolet light to visible light.
Answers
Answer:
Sunlight is a mixture of colors. When it passes through a glass prism, some of the light is bent, or refracted, more than other portions. And just as sunlight passing through a prism is bent, so is sunlight passing through drops of water. This produces an atmospheric solar spectrum in the sky for all to see: a rainbow.
Explanation:
1. You take a walk in the park for 15 steps using a compass that points 25° North of East.
• How would you use the simulation to represent your path?
• Explain why the same representation works for illustrating this different scenario: You drive at
15 miles/hour using a compass that points 25° North of East.
Answers
a) The graphic depicts the simulation used to illustrate the directions.
b) since its angle with respect to the x-axis and the distance it consistently travels are provided. They are also independent of any particular units.
The x-axis is what?the X-axis, sometimes called the abscissa axis. The axis, which is frequently horizontal, along which the ordinate and abscissa are measured (in a planar Cartesian coordinate system).
Because the query is directed and we know its angle in relation to the x-axis as well as the constant distance traveled, the various possibilities all make sense. They are also independent of any particular units.
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An inductor and a resistor are connected in a simple series circuit. If the inductance increases, the current in the circuit
a. Does not change.
b. Decreases.
c. Increases.
Answers
An inductor and a resistor are connected in a simple series circuit. If the inductance increases, the current in the circuit decreases. The correct answer is b.
An inductor is a passive component that stores energy in a magnetic field when electric current flows through it. In a series circuit, the current flows through both the inductor and the resistor. When the inductance of the inductor increases, the opposition to the current flowing through it also increases, known as inductive reactance. This results in a decrease in the current flowing through the circuit, as more energy is being stored in the magnetic field of the inductor and less is available to flow through the resistor.
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John doesn't think that skepticism should play an important role in the scientific process. He says that skepticism interferes with scientific consensus. Which statement best describes John's conclusion
Answers
Answer: it is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.
Explanation:
Skepticism is simply the understanding that there can be uncertainty when it comes to knowledge in certain areas.
From the question, we are informed that John doesn't think that skepticism should play an important role in the scientific process and that he says that skepticism interferes with scientific consensus.
The statement that best describes John's conclusion is that it is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.
Suppoe that a high-energy neutron i travelling at a peed of 18 million m/. Find it energy in MeV (million electron volt (eV))
Answers
The energy of the high energy neutron is 940.51 MeV.
Speed is nothing but the distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity with the SI unit meter/second.
We know that mass of the neutron m₀ = 939.6 MeV/c²
A high energy neutron is travelling at a speed of 18 million m/s.
Given that, v = 1.8 * 10⁷ m/s
The energy of neutron is calculated with the formula, m₀* c²/√(1 - v²/c²)
⇒ 939.6 * (3* 10⁸)²/√[1 - (1.8 * 10⁷)²/(3* 10⁸)²]
⇒ 940.51 MeV
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find the resistance of a 0.85 km length of such wire used for power transmission in ω.
Answers
Resistance of 0.85 km length of wire used for power transmission in ω can be found using the following steps:Given data:Length of wire, L = 0.85 km = 850 m.
Cross-sectional area of wire, A = 7.5 × 10-7 m2.Using the formula,R = (ρL)/AWhere, R is the resistance of the wire, L is the length of the wire, A is the cross-sectional area of the wire, and ρ is the resistivity of the wire.Resistivity of the wire can be calculated using the formula,ρ = RA/LWhere, ρ is the resistivity of the wire, R is the resistance of the wire, A is the cross-sectional area of the wire, and L is the length of the wire.
Substituting the given values in the formula,
ρ = (RA)/L
= (7.5 × 10-7 × R)/850ρ
= R/(1133333.33)R
= ρ × L/A
= ω × L/A (since ω is the unit of resistivity)
Now, substituting the given values in the formula,R = 0.0174 ω (approximately)Therefore, the resistance of a 0.85 km length of wire used for power transmission in ω is approximately 0.0174 ω.
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Which option reflects the use of chunking to remember items to pack for a trip?
Making an alphabetical list of what to pack
Creating a rhyme to help remember what to pack
Making a list of items to pack organized by where each item is in your room
Creating an acronym to help memorize the list of items to pack
Answers
The correct option among the answer choice given above which reflects the use of chunking to remember items to pack for a trip is:
Making a list of items to pack organized by where each item is in your room
Option c is the correct answer
What is trip and ravelling ?A trip simply refers to a relatively short journey. It is called traveling when there is movement from one place to another usually to a long distant location
So therefore, the correct option among the answer choice given above which reflects the use of chunking to remember items to pack for a trip is:
Making a list of items to pack organized by where each item is in your room
Option c is the correct answer
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Answer:
C
Explanation:
Which type of wave requires a material medium through which to travel?
A: Sound
B: Television
C: Radio
D: X Ray
Answers
The type of wave that requires a material medium through which to travel is Sound. The correct answer is option A.
Sound waves are mechanical waves, which means they require a medium (such as air, water, or solids) to travel through. In contrast, television, radio, and X-ray waves are all examples of electromagnetic waves, which can travel through a vacuum and do not require a material medium.
Television (option B), radio (option C), and X-ray (option D) waves are all examples of electromagnetic waves that can travel through vacuum and do not require a material medium. Therefore the correct answer is A: Sound.
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A rock has a density of 2 g/mL and a mass of 17.5 g. What is the volume of the rock?
HELP PLEASE
Answers
What is the equation for burning a fossil fuel
Answers
Answer:
Fuel + O2 → CO2 + H2O
Explanation:
A Car accelerates from 4 m/s to 16 m/s in 4 seconds. What is the car's
acceleration?
O 12 m/s^2
3 m/s^2
4 m/s^2
O 1 m/s^2
Answers
Answer:
4 m/s^2
that is the right acceleretion a car
Answer:
I believe that the answer is 3 m/s^2
Explanation:
since acceleration is final velocity minus initial velocity divided by time, we can plug in known values and solve.
a=(f-i)/t
a=(16-4)/4
a=12/4
a=3
3m/s^2 is the acceleration
No matter how high Juan and Susie jumped on the trampoline, they always came back down. What force caused the two children to land
back on the surface of the trampoline each time they jumped in the air?
A)spring
B)friction
C)bounce
D)gravity
Answers
gravity caused the two children to land
Answer: Gravity
Explanation: Because it is causing them to go down in which when they bounce they get pulled right back down because of the gravitational pull of the earth's core.
What are three reasons why nebulae contribute more to stellar formation than other regions of the universe?
Answers
Answer:
Nebulae contribute more to stellar formation than other regions because:
Explanation:
A.They have an unlimited supply of hydrogen.
B. They are believed to be rich in hydrogen and helium.
C. They have a three strong gravitational pull.
This are the reasons that Nebulae contribute more to stellar formation than other regions.
Which describes the results of the double slit experiment? select 2 options. waves produced a diffraction pattern. results supported the wave theory of light. results demonstrated the relationship between electric and magnetic fields. beams of light separated as they passed through a prism. results supported the particle theory of light.
Answers
The results of young's double-slit experiment were
- Waves produced a diffraction pattern.
- Results supported the wave theory of light.
- Results supported the particle theory of light
Two coherent sources of light are employed in Young's double-slit experiment, which is often conducted at a distance that is only a few times greater than the wavelength of the light used. Young's double-slit experiment contributed to our knowledge of the diagrammed wave theory of light.
The act of bending of the light around edges such that it expands out and illuminates regions, where a shadow is anticipated, is known as the diffraction of light. In general, since both occur simultaneously, it is challenging to distinguish between diffraction and interference.
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Answer: A,B,E.
Explanation: doing the quiz on edge!
Which of the following shows a change in velocity? Group of answer choices Wendy is riding her bike in a circle in the parking lot. Amber is sitting on a park bench. Ken is driving on Interstate 4 at 65 mph. Jessica is walking her dog along Chestnut Avenue.
Answers
Wendy riding her bike in a circle in the parking lot is a change in direction, but her speed is constant, so her velocity is not changing. Amber sitting on a park bench and Jessica walking her dog along Chestnut Avenue are both stationary, so there is no change in velocity.
What is Velocity?
It is defined as the change in position of an object over a unit of time, usually measured in meters per second (m/s) or kilometers per hour (km/h), in a specific direction.
In physics, velocity is distinguished from speed, which is the magnitude of an object's velocity but without regard to its direction. Velocity is a more precise term than speed because it includes both magnitude and direction. For example, a car traveling at 60 km/h east has a different velocity than a car traveling at 60 km/h west.
Velocity is a fundamental concept in many areas of physics, including mechanics, thermodynamics, and electromagnetism. It is used to describe the motion of objects ranging from subatomic particles to celestial bodies in the universe.
The only option that shows a change in velocity is Ken driving on Interstate 4 at 65 mph. This is because velocity is a vector quantity that includes both speed and direction. As Ken is driving, he is changing his direction or speed, or both, which means his velocity is changing.
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Two parallel plates of area 5.68.10-³ m²
have equal and opposite charges of
4.38 10-¹1 C placed on them. What is
the electric field between the plates?
[?] N/C
Answers
Answer:
\(\vec E=871.33 \ \frac{N}{C} }\)
Explanation:
Given that two parallel plates with an area of \(5.68 \times 10^{-3} \ m^2\) have equal and opposite charges of \(4.38 \times 10^{-11} \ C\). Find the value of the electric field between them.
Using the following equation,
\(\boxed{ \vec E=\frac{Q}{A \epsilon_0}; \ \ \epsilon_0=8.85 \times 10^{-12}\frac{C^2}{Nm^2} }\)
Plug the known values into the equation.
\(\vec E=\frac{4.38 \times 10^{-11}}{(5.68 \times 10^{-3})(8.85 \times 10^{-12})}\\\\\therefore \boxed{\boxed{\vec E=871.33 \ \frac{N}{C} }}\)
Thus, the electric field is found.
multiple choice
12) When you move your hand or foot, your body has converted potential energy into ________ energy.
13) When coasting while roller skating, you eventually stop due to ________.
14) A ball has 100 J of potential energy when it is on a shelf. The kinetic energy of the ball the instant it hits the floor is ________J.
Answers
12). When you move your hand or foot, your body has converted potential energy into kinetic energy.
13). When coasting while roller skating, you eventually stop due to
friction causes kinetic energy to transfer to thermal energy.
14). A ball has 100 J of potential energy when it is on a shelf. The kinetic energy of the ball the instant it hits the floor is Kinetic increases, potential decreases.
What is kinetic energy, and how is it used?Kinetic energy is the force that propels motion, which can be seen in the movement of a particle, an object, or a group of particles. A person walking, a baseball being thrown, a piece of food falling from a table, and a charged particle in an electric field are all examples of objects in motion that use kinetic energy.
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cooling tends to lead to an increase in the amount of ice and snow, which reflects solar radiation, leading to more cooling. this process is known as:
Answers
This process is known as the ice-albedo feedback. The ice-albedo feedback is a positive feedback loop in which cooling leads to an increase in ice and snow, which in turn reflects more solar radiation back to space, leading to further cooling.
As more ice and snow accumulate, the albedo, or reflectivity, of the Earth's surface increases, which reduces the amount of solar radiation absorbed by the planet. This can have significant effects on climate, as the ice-albedo feedback can amplify changes in temperature.
For example, if the Earth's temperature begins to decrease, more ice and snow will accumulate, which will further cool the planet. This feedback loop can also work in reverse, with warming leading to less ice and snow, which reduces reflectivity and leads to further warming. The ice-albedo feedback is an important factor in the Earth's climate system and is being studied to better understand its potential impacts on the planet's future climate.
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drum brakes use replaceable friction material called ________.
Answers
Drum brakes use replaceable friction material called brake shoes. Brake shoes are curved metal components that contain the friction lining or pads.
They are designed to press against the inner surface of the brake drum when the brakes are applied, creating friction and ultimately slowing down or stopping the vehicle.
The friction material on the brake shoes is typically made of heat-resistant materials such as organic compounds, metallic compounds, or a combination of both.
Over time, the friction material on the brake shoes wears down and needs to be replaced to maintain the braking performance and ensure proper function of the drum brake system.
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