Answer:
Time to reach maximum height can be obtained from v=u+at
0=20+(−10)t
t=2s
s=ut+0.5at
2
=20(2)+0.5(−10)(2)
2
=20m
Thus, total distance for maximum height is 45 m
s=ut+0.5at
2
45=0+0.5(10)(t ′ )
2
t
′
=3s
Total time= 3+2= 5s
Explanation:
TAKE 22.0 IN PLACE OF 20 U WILL GET YR ANSWER
HOPE IT HELPS
what was the lowest temperature ever recorded on earth?
Answer:
From Dr. Stephen Warren, University of Washington (8/22/2007): The world record for low temperature was set at Vostok Station, Antarctica, on 21 July 1983. Cerveny et al. (2007) give this temperature as -89.4°C in their Table 2, quoting Krause and Flood (1997), who gave the same value.
(Hope this answered your question!)
A thin rod of superconducting material 2.50 cm long is placed into a 0.540 -T magnetic field with its cylindrical axis along the magnetic field lines.(b) Find the magnitude of the surface current on the curved surface of the rod.
The magnitude of the surface current on the curved surface of the rod is 5.40 A.
To determine the magnitude of the surface current on the curved surface of the rod, we need to consider the interaction between the magnetic field and the superconducting material. In a superconductor, the magnetic field cannot penetrate the material and is expelled from its interior. This expulsion of the magnetic field creates a circulating current on the surface of the superconducting material, known as the surface current.
In this case, the rod is placed along the magnetic field lines, which means the magnetic field is perpendicular to the curved surface of the rod. According to the Meissner effect, the magnetic field will be completely expelled from the interior of the superconducting material, resulting in a uniform surface current on the curved surface.
To find the magnitude of the surface current, we can use the equation:
B = μ₀ * J_surface,
where B is the magnetic field strength, μ₀ is the permeability of free space (4π × 10⁻⁷ T·m/A), and J_surface is the surface current density.
Rearranging the equation, we have:
J_surface = B / μ₀.
Substituting the given values, with B = 0.540 T and μ₀ = 4π × 10⁻⁷ T·m/A, we can calculate:
J_surface = 0.540 T / (4π × 10⁻⁷ T·m/A) = 5.40 A.
Therefore, the magnitude of the surface current on the curved surface of the rod is 5.40 A.
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Create a simple series circuit with a 20-volt battery, one 10.0 ohm resistor, and one 15-ohm light bulb. Set the wire resistivity to "tiny" and the battery resistance to 0.0 ohms What is the current in the circuit? 0.5A 0.4 A 0.8A 1.0 A
Answer:
O.8A
Explanation:
the temperature in degrees farenheight in times square during a day in aguast can be predicted by the function t(x)
The given statement is that the temperature in degrees Fahrenheit in times square during a day in August can be predicted by the function t(x).
Hence, it can be stated that the function t(x) provides a prediction for the temperature in degrees Fahrenheit in Times Square for a given value of x. Here, x represents the input variable.
It is important to note that the input variable must be provided in the correct units and format as required by the function t(x).The content loaded refers to the data that has been previously collected and is available for analysis. In the context of predicting temperature using function t(x),
the content loaded can refer to temperature data collected in Times Square during August on previous days or years. This data can be analyzed and used to develop the function t(x) that predicts temperature for a given input variable x.
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Calculate the ratio of the drag force on a jet flying at 1000km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at half that speed and altitude. The density of air is 0.38kg/m 3
at 10 km and 0.67kg/m 3
at 5.0km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C.
The airplanes have the same effective cross sectional area and drag coefficient. Then, the ratio of drag force at the two densities is 2.3.
What is drag force ?The drag force is an air resistance which resist the motion of objects passing through air. It is related to the density ρ, drag coefficient C, velocity v and area A as follows:
D = 1/2 ρCAv².
Here, C and A are the same then the ratio of the drag forces D1 and D2 at the two densities is:
D1/D2 = ρ1 v1²/ρ2 v2²
ρ1 = 0.38 kg/m³
ρ2 = 0.67 kg/m³
v1 = 1000 km/h
v2 = 500 km/h
Then the ratios of drag force is ;
D1/D2 = 0.38 kg/m³ × 1000 km/h / (0.67 kg/m³ × 500 km/h)
= 2.3
Therefore, the ratio of drag force at the two densities is 2.3.
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a metal conducting sphere of radius r holds a total charge q. what is the charge enclosed by a gaussian sphere of radius r, where 0 < r < r?
The charge enclosed by a Gaussian sphere of radius r, where 0 < r < r, is q. This is because the charge enclosed by a Gaussian surface only depends on the total charge inside the surface, and not on the shape or size of the surface.
In this case, the conducting sphere of radius r is the same as the Gaussian sphere of radius r, so all of the charge q is enclosed by the Gaussian sphere. As the radius of the Gaussian sphere decreases to zero, the charge enclosed by the sphere also decreases to zero, since there is no charge inside the sphere
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Critics of the electoral college argue that the system can result in the selection of —
Answer:
President who did not win the popular vote
Explanation:
Critics of the Electoral college argue that the system can result in a selection of what?
Noticing large amounts of algal growth in her small farm pond, a farmer adds about 20 grass carp to feed on the abundant algae and plants. After several years, the carp grow large, exceeding 20 pounds each in size. Late one summer, the farmer notices that the carp and most of the other fish are dead. The water also smells very bad. Which one of the following is the most likely explanation for the death of these fish?
A. the algae overgrew the pond and produced toxic levels of ozone
B. carbon dioxide released by the carp and algae eventually suffocated the fish in the pond
C. the large carp grew so large that they could not get enough oxygen
D. bacteria feeding on the large volume of carp feces depleted the oxygen
Answer:
D. bacteria feeding on the large volume of carp feces depleted the oxygen
Explanation:
In the context, it is given that in a small farm pond, the owner added 20 grass carp and feed them with the abundant plants and algae that is found on her pond. The carp grew large after many years but one summer the owner found the grass carps along with other fishes were dead.
The most possible explanation for the dead of the fishes in the pond because the bacteria feeds on the carp feces which depletes the dissolved oxygen present in the water. Thus the fishes could not breathe and were finally dead.
Therefore, the correct option is (D).
9. A speedboat engine exerts 90000 W of power in moving the boat through the water. The velocity of the boat is 1P = 5 m/s. What force does the engine apply to do this?
P = F x V
Answer:
it g hope it helps you out
The direction of a moving object will not change if the net force acting on it is
Answer:
The direction of a moving object will not change if the net force acting on it is zero.
Explanation:
If there is a net force acting on a body, the body may accelerate, slow down, or change direction. In other words, an unbalanced net force may change the state of motion of a body.
The only way a moving object will not change its direction if the body is moving with a constant velocity, meaning all the forces acting on the body are in equilibrium (or balanced). In other words, the net force acting on it is zero, and the speed, as well as direction, would not change.
Therefore, we conclude that the direction of a moving object will not change if the net force acting on it is zero.
what is meant by input and output work
Answer:
the x and y values
Explanation:
because on the table the x is the input and y is the output
What is the energy of an object because of its potential and kinetic energies?
chemical energy
electrical energy
nuclear energy
mechanical energy
Answer:
It is D
Explanation:
mechanical
Answer:
it is D on edge
Explanation:
A bridge is 200 m above a river. If a lead fishing weight is thrown from the bridge with a horizontal velocity of 15m/s, what is the horizontal distance it will travel before hitting the water?
A projectile has an initial x-velocity of 4 m/s, and an initial y-velocity of 27.7 m/s. What is the range of the projectile
Answer:
I love yourself help yourself
calculate the frequency, in megahertz, of the accelerating voltage needed for a proton in a 1.15-t field.
The frequency of the accelerating voltage needed for a proton in a 1.15-t field is 28.1 MHz.
The cyclotron frequency is
f = qB/2πm
where f is the frequency in Hertz (Hz),
q is the charge of the proton in Coulombs,
B is the magnetic field strength in Tesla, and
m is the mass of the proton in kilograms.
For a proton, the charge is q = 1.602*10⁻¹⁹ C,
and the mass is m = 1.673*10⁻²⁷ kg.
If the magnetic field strength is given as B = 1.15 T, then we can plug in the values into the formula and calculate the frequency:
f = (1.602*10⁻¹⁹ C)(1.15 T)/(2π)(1.673*10⁻²⁷kg)
= 28.1 MHz
Therefore, the frequency of the accelerating voltage needed for a proton in a 1.15 T field is approximately 28.1 MHz.
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the average no-load voltage in a dc arc welding circuit is ____ volts. 10–20 15–30 60–80 15–40
The average no-load voltage in a DC arc welding circuit is typically in the range of 60-80 volts.
What is arc welding?Arc welding is a welding technique that uses an electric arc to melt the base metal and fusing it with the filler metal to create a weld. The welding machine supplies an electric current to a consumable electrode or filler wire to melt the metals, forming a weld pool. The two metals fuse when the weld cools down. The weld is as strong as the base metal and can be used to construct everything from automobile components to skyscrapers.
What is the no-load voltage?In a welding circuit, the no-load voltage is the voltage between the welding electrode and the workpiece before a welding arc is struck. Before the start of a welding operation, the circuit is energized and, as a result, the welding machine produces an open circuit voltage. It is also known as the no-load voltage, which is the voltage measured at the output terminals of the welding machine when the welding arc is inactive and the electrode is not in contact with the workpiece.
The average no-load voltage in a DC arc welding circuit is typically around 60-80 volts. This voltage range is necessary to establish and maintain an electric arc between the welding electrode and the workpiece, enabling the welding process to occur efficiently.
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Hi me and my friends are making a project about 'Pros and cons of different subjects' and i was wondering if yall could write cons about different subjects like physics,chemistry,history etc because we already wrote about pros and we really need help
Answer:
if A={5,10,15}and B={1,3,15} subsets of u ={1,3,5,10,15,20} find a (AUB)the frequency range for am radio is 540 to 1600 khz. the frequency range for fm radio is 88.0 to 108 mhz. From to Submit Answer Tries 0/6
The frequency range for AM radio is 540 to 1600 kHz, and the frequency range for FM radio is 88.0 to 108 MHz.
AM stands for Amplitude Modulation.
This refers to the fact that an AM radio signal's strength is adjusted to match the sound waves.
The sound signal amplitude is used to adjust the carrier signal amplitude, resulting in an AM radio signal.
The AM band operates at a frequency range of 540 to 1600 kHz.
FM stands for Frequency Modulation.
The frequency of the carrier signal is adjusted to match the sound waves in FM radio.
The frequency of the carrier signal is altered in response to the sound signal.
The FM band operates at a frequency range of 88.0 to 108 MHz.
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a wind turbine with an efficiency of 45% for converting wind energy into electrical energy is designed to yield 10 kw of electrical power in a 20 mi/h wind. [the density of air is 1.2 kg/m3.] (a) what length rotor blades does this wind turbine hav
A wind turbine with an efficiency of 45% for converting wind energy into electrical energy is designed to yield 10 kW of electrical power in a 20 mph wind. The density of air is 1.2 kg/m³. The length of rotor blades that this wind turbine
Given that electrical power is 10 kW.
Electrical Power = (efficiency) × (wind energy intercepted by the rotor blade).
The wind energy intercepted by the rotor blade can be defined as:
Wind energy intercepted by rotor blade = (1/2) × (density of air) × (area swept by the rotor blade) × (velocity³)A = (2 × electrical power) ÷ (efficiency × density of air × velocity³)A = (2 × 10000) ÷ (0.45 × 1.2 × (20 × 0.447)³).
The area swept by the rotor blade is 128.6 m².
Since, Area of a circle = πr²
Where A = 128.6 m²πr² = 128.6 m²∴ r² = 41.016∴ r = 6.407 m.
So, the rotor blade of the wind turbine is 12.814 meters in length. Hence, the correct answer is 12.814 meters.
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15% input work is lost due to friction then what is the efficiency of machine?
Answer:
I think 50%
Explanation:
Because the efficiency of a machine is always less than 100%. And efficiency of a machine is 75%.
So, if 15% input work is lost due to friction then efficiency is maybe 50%.
You decide to use an iron-titanium alloy for a new turbine engine. The melting temperature of iron is 1538°C and the melting temperature of titanium is 1668°C. Do you think it will be safe to have the turbine component operate at 1150°C?
Yes, it will be safe to have the turbine component operate at 1150°C
Based on the given information, the melting temperatures of iron and titanium are 1538°C and 1668°C, respectively. In an iron-titanium alloy, these two elements are combined, resulting in an intermediate melting temperature. This alloy would have a higher melting temperature than pure iron and lower than pure titanium.
Operating the turbine engine at 1150°C would be safe, as this temperature is significantly below the melting temperatures of both elements. It provides a sufficient margin of safety for the alloy, ensuring that it remains solid and stable during operation. Additionally, alloys typically have improved mechanical properties, such as increased strength and resistance to wear, compared to their constituent elements. This makes iron-titanium alloys suitable for high-temperature applications like turbine engines.
In summary, using an iron-titanium alloy for a turbine engine operating at 1150°C should be safe and appropriate due to its enhanced mechanical properties and melting temperature range.
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The diagrams below show a man swinging a golf club.
The kinetic energy of the golf club at point Y is more than the potential energy of the club at point X. Which of the following statements best explains why this fact does not violate the law of conservation of energy?
Energy is added by the man to the golf club from point X to point Y
Gravity is constant from point X to point Y
Air resistance is greater at point than at point X
Acceleration due to gravity is greater at point than at point X
Answer: Energy is added, by the man, to the golf club from point X to point Y.
Explanation: i think :)
can you tell Which body part does not help in the perception and production of sound in humans?
ears, lungs, mouth or vocal cords
which is not?
Lungs do not help in the perception and production of sound in humans.
What are lungs?Gaseous exchange occurs during inhalation and exhale during breathing. Main components of the human respiratory system include the nose, mouth, throat, larynx, trachea, bronchi, and lungs.
In humans and other vertebrates, the primary organs for respiration are the lungs. They are situated in the thoracic cavity of the chest, on either side of the heart. The lungs are spongy, anatomically speaking, with a total surface area that ranges from 50 to 75 square meters.
The lungs' main job is to make it easier for gases to move from the blood into the air. It's interesting to note that the right lung is significantly larger and heavier than the left.
Hence, lungs do not help in the perception and production of sound in humans.
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A charge of 6.5 x 10-5 C is attracted by another charge with a force of 250 N when
they are separated by 0.15 m. Find the magnitude of the other charge.
8.65 X 105 C
9.62 × 10-2 C
6.15 x 10-6 C
O 9.62 x 10 c
Answer:
We can use Coulomb's law to solve this problem:
F = k * q1 * q2 / r^2
where F is the force between the two charges, k is Coulomb's constant (k = 9 x 10^9 N m^2 / C^2), q1 and q2 are the magnitudes of the charges, and r is the distance between them.
We know the force F, the distance r, and the magnitude of one of the charges q1. We can rearrange the equation to solve for the magnitude of the other charge q2:
q2 = F * r^2 / (k * q1)
Substituting the values we have:
q2 = (250 N) * (0.15 m)^2 / (9 x 10^9 N m^2 / C^2 * 6.5 x 10^-5 C)
Simplifying:
q2 = 8.65 x 10^5 C
Therefore, the magnitude of the other charge is 8.65 x 10^5 C.
Why does air move from solid land towards water during the night?
A-Solid ground cools faster at night while water remains heat longer, warming the air above the water.
B- The ground retains the heat from the sun longer than the water.
C- The dry air over the land is heavier than the air over the water the contains more water vapor
D- gravity moves the air towards the water because water is lower than the land
Answer:
A
Explanation:
This is to do with convection currents :)
Hope this helps!
A car of 5 tonnes is moving with a speed of (v), having a k.e. of 2250kJ. Find the velocity of the car.
Answer:
30 m/s
Explanation:
Data :
Mass=5 tonnes = 5000kg
K.E =2250 kJ = 2.250 .10^6 J
Si the formula
K.E =(1/2)mv^2
v^2 =(K.E . 2)/m
v^2 =4.5 .10^6/5000
v^2 =900
After taking square root on both side
The velocity of the car is
V =30 m/s
Why do our eyes see the color red when we look at a tomato?
A. Tomatoes emit red light.
B.Tomatoes reflect red light and absorb green and blue light.
C. Tomatoes absorb red light and reflect green and blue light.
D. Tomatoes reflect all colors of light, but our eyes only absorb red light,
Answer:
B. Tomatos reflect red light
Explanation:
The only reason colors exist is because the objects with color reflect all other light except for what they are portrayed as. White reflects all colors, and black absorbs all colors.
If you have any questions feel free to ask :)
Answer:
Explanation: the pigment atoms in the skin absorb photons of all energies except those that correspond to red wavelengths of light, which they reflect back to your eye.
B is more likely the answer
how does the total translational kinetic energy of all molecules in an ideal gas depend on the temperature?
The total translational kinetic energy is directly proportional to the temperature of gas. The higher the temperature, the greater the total translational kinetic energy of all molecules in an ideal gas.
How to find the translational kinetic energy?In an ideal gas, the translational kinetic energy can be counted by the following equation.
E = 3/2 kT
Where
E = translational kinetic energy (J)k = Boltzmann constant (1.381 × 10⁻²³.m².kg.s⁻².K⁻¹)T = temperature of gas (K)That is the energy per particle. If there are N particles of gases, the formula would be:
E = 3/2 NkT
Where
N = number of gas particlesThus, the total translational kinetic energy of all molecules in an ideal gas can be counted by the formula E = 3/2 NkT. It means that the kinetic energy is directly proportional to the temperature of gas.
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Which statement describes a property of a proton?
Answer:
They have no charge and are present in the nucleus of an atom. They have a negative charge and travel around the nucleus of an atom. They have a positive charge and travel around the nucleus of an atom
Explanation:
The electrons, which are negatively charged particles, are drawn to the protons because they have a positive electric charge. This keeps them in an orbit around the nucleus. A proton, therefore, possesses the quality of a positive charge.
What is proton?The proton is a stable subatomic particle with a rest mass of 1.67262 1027 kg, or 1,836 times the mass of an electron, with a positive charge that is equal to one electron's charge in magnitude.
All atomic nuclei, except for the hydrogen nucleus, are composed of protons and neutrons, which are electrically neutral particles (which consist of a single proton). A given chemical element's nuclei all contain the same number of protons.
They exist in the atom's nucleus and are not charged. They move around the atomic nucleus and have a negative charge. Likewise, they move about an atom's nucleus and have a positive charge.
Typically, a proton is made up of three quarks, which are tiny subatomic particles.
The protons are the electrically charged atom-nucleus particles that help hold the nucleus of an atom together.
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Tần số ngưỡng của một kim loại có giá trị X. Nếu tần số của chùm sáng chiếu đến bề mặt katot tăng từ 2X đến 4X thì cường độ dòng quang điện sẽ
Answer:
Năng lượng tăng gấp đôi.
Explanation:
Như chúng ta biết
E = nhf
Năng lượng tỷ lệ thuận với f
Thay đổi về tần số sẽ tương đương với những thay đổi tương tự về Năng lượng
Nếu tần số trở thành hai lần, thì năng lượng sẽ trở thành 2 lần.