The astronomer who first worked out the mathematical description of black hole event horizons was?
Answers
Karl Schwarzschild devised the first general relativity model that would adequately describe a black hole in 1916.
What is Black Hole?
A black hole is an area of spacetime with such intense gravitational pull that nothing can escape from it, not even light or other electromagnetic waves. According to general relativity theory, a compact enough mass can bend spacetime into a black hole. The event horizon is the line beyond which there is no escape.
Black holes were once thought to be a mathematical curiosity, but theoretical research in the 1960s revealed that they were actually a general prediction of general relativity.
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Related Questions
If a new variable rectangle shape = new rectangle(10, 20); was initialized, what is the correct syntax for retrieving the area of shape?
Answers
The correct syntax to retrieve the area of the rectangle shape would be: int area = shape.area().
To retrieve the area of the rectangle shape, you can use the dot operator in Java to access the area method of the Rectangle class. The correct syntax would be:
int area = shape.area();
Here's a step-by-step explanation:
1. Declare a variable named "area" with the data type "int". This variable will store the area of the rectangle.
2. Use the dot operator (".") to access the area method of the Rectangle class.
3. Call the area method on the "shape" object, which is an instance of the Rectangle class.
4. Assign the return value of the area method to the "area" variable.
In conclusion, the correct syntax to retrieve the area of the rectangle shape would be: int area = shape.area(). This will calculate the area of the rectangle and store it in the "area" variable.
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how similar is the cd’s groove number in data table 3 to the typical value of 625? what factors would affect any discrepancies?
Answers
There may be some discrepancies depending on various factors such as the manufacturing process, quality control measures, and the type of equipment used to produce the CD.
the groove number could include the temperature and humidity levels during production.
According to data table 3, the CD's groove number is 627, which is very similar to the typical value of 625. However, there may be some discrepancies depending on various factors such as the manufacturing process, quality control measures, and the type of equipment used to produce the CD. Other factors that may affect the groove number could include the temperature and humidity levels during production, variations in the raw materials used, and the specific requirements of the CD's intended use. Overall, while there may be some minor discrepancies in the groove number, these are typically well within the acceptable range and should not significantly impact the CD's performance or functionality.
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7. Epiphytes in a rainforest use rainforest trees for
food
b. support
C. oxygen
d. pollination
Answers
Epiphytes are plants that grow on other plants, such as trees, but do not obtain nutrients from the soil. Instead, they absorb moisture and nutrients from the air and from rainwater that collects on their leaves. In a rainforest, where the ground is often covered by dense vegetation and the soil is poor, epiphytes have adapted to grow on trees as a means of support and to reach sunlight. The trees provide a substrate for the epiphytes to attach to and grow on, as well as a way to access light and nutrients. In turn, the epiphytes may provide habitat and food for other organisms, such as insects, birds, and small mammals.
a parallel-plate air capacitor has a capacitance of 400.0 pf&a charge of magnitude point 250km each plate the place rp-600m em apart what is the potential difference between the plate
Answers
The potential difference between the plates of the parallel-plate air capacitor is 0.625 × \(10^{(-7)}\)volts, which can be written as 6.25 × \(10^{(-8)}\)volts or 62.5 nV.
The potential difference between the plates of a parallel-plate air capacitor, we can use the formula:
C = Q / V
Where C is the capacitance, Q is the charge, and V is the potential difference. Rearranging the formula to solve for V, we have:
V = Q / C
The capacitance (C) is 400.0 pF and the charge (Q) is 0.250 mC (converting 250 km to 0.250 m), we can substitute these values into the formula:
V = 0.250 mC / 400.0 pF
To perform the calculation, we need to ensure that the units are consistent. Converting 400.0 pF to Farads (F), we have:
V = 0.250 mC / 0.400 nF (1 nF = \(10^{(-9)}\) F)
V = 0.250 mC / 0.400 ×\(10^{(-9)}\) F
Simplifying the expression, we have:
V = 0.625 ×\(10^{(-7)}\)) C / F
Therefore, the potential difference between the plates of the parallel-plate air capacitor is 0.625 × 1\(10^{(-7)}\) volts, which can be written as 6.25 × \(10^{(-8)}\) volts or 62.5 nV.
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A sales clerk at a local hardware store sells you a hammer with a mechanical advantage of 10 when used to pry up nails. You are able to create a force of 60 N. Using the hammer, what would be the maximum force that could be generated to remove a nail?
Answers
Answer:
W = 600 N
Explanation:
The mechanical advantage of any machine is the ratio of the load or weight to the effort applied. Hence, the general formula for mechanical advantage is as follows:
M.A = W/P
where,
M.A =Mechanical Advantage of Hammer = 10
W = Maximum force that could be generated = ?
P = Force created by me = 60 N
Therefore,
10 = W/60 N
W = 10*60 N
W = 600 N
In order for work to be done on an object, the force must be in the same direction as the object moves. true or false?
Answers
Answer:
True
Explanation:
because in science work is only said to be done when the body moves through the distance of the force applied
the sun emits electromagnetic waves with a power of 4.0*10^26 w. determine the intensity of electromagnetic waves from the sun just outside the atmosphere of venus. refer to the table of astronomical data inside the back cover of the textbook. determine the intensity of electromagnetic waves from the sun just outside the atmosphere of mars.
Answers
The intensity of electromagnetic waves from the sun just outside the atmosphere of Venus and Mars respectively is
2.65 x 10⁹ W/m² and 0.61 x 10⁹ W/m².
The astronomical data states that the distance between Venus and the Sun is 0.723 AU (1 AU≈1.5 x 10⁸).
The intensity of the electromagnetic waves outside the atmosphere of Venus is then equal to the power of the Sun divided by the surface area of a sphere with a radius equal to the distance between Venus and the Sun, which is equal to:
4.0*10²⁶ W/ 4π(0.723 AU)² = 2.65 x 10⁹ W/m².
The astronomical data states that the distance between Mars and the Sun is 1.524 AU.
The intensity of the electromagnetic waves outside the atmosphere of Mars is then equal to the power of the Sun divided by the surface area of a sphere with a radius equal to the distance between Mars and the Sun, which is equal to:
4.0*10²⁶ W/ 4π(1.524 AU)² = 0.61 x 10⁹ W/m².
Therefore, the intensity of electromagnetic waves from the sun when it emits electromagnetic waves with a power of 4.0*10²⁶ W just outside the atmosphere of Venus and Mars is 2.65 x 10⁹ W/m² and 0.61 x 10⁹ W/m² respectively.
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In which reaction are the atoms of elements rearranged?
A. a neutron fuses with plutonium-239 to form plutonium-240.
B. two isotopes of hydrogen fuse to form helium.
C. sodium combines with chlorine to form sodium chloride.
D. uranium-235 breaks apart into krypton, barium, and three neutrons.
Answers
Answer:
C. sodium combines with chlorine to form sodium chloride
Explanation:
Answer:
C. sodium combines with chlorine to form sodium chloride.
Explanation:
My aunt and uncle live somewhere in south Florida near the beach
Answers
What fitness level is helpful to know when a person is starting an exercise program
Answers
Answer:
There are various areas that should be considered to access the fitness level of an individual.
Explanation:
Knowing the specific details can help an individual to set realistic fitness goals, monitor their progress, and retain motivation. Fitness is typically measured in four main areas: cardiovascular fitness, muscle strength and endurance, flexibility, and composition of the body. It is important to evaluate these vital components of fitness so that one gets a fair knowledge of present fitness level and plan for the future accordingly.
advantages of cutting crops with sickle ? please friends give this answer in easy way....
Answers
Answer: The only advantage cutting crops with a sickle is that its very effective for cutting lodged crops.
4) A 200 kg empty cart moves east at 15 m/s. A 50kg rock is dropped straight down into th
moving cart. What is the final speed of the railroad cart?
Answers
The final speed of the railroad cart is equal to 12 m/s.
What is law of conservation of linear momentum?According to the law of conservation of momentum, the sum of the momentum before and after the collision of the objects must be equal.
m₁u₁ + m₂u₂ = m₁ v₁ + m₂ v₂
Where m₁ and m₂ are the mass of the objects, u₁ and u₂ are the initial speed while v₁ & v₂ is the final speed.
The momentum of an object is defined as the product of the mass times the velocity of that object.
Given the mass of the empty cart, m₁ = 200 Kg
The mass of the rock, m₂ = 50 Kg
The initial velocity of the empty cart, u₁ = 0
m₁ u₁ + m₂ u₂ = (m₁ + m₂)× V
200 × 15 + 50 × 0= (200 + 50) × V
V = 12 m/s
Therefore, the final speed of the railroad cart is equal to 12 m/s.
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Planet X has a mass of M and a radius of R. Planet Y has a mass of 3M and a radius of 3R. Identical satellites orbit both planets at a distance R above their surfaces, as shown above. The planets are separated by such a large distance that the gravitational forces between them are negligible.
How does the magnitude of the gravitational force FY exerted by Planet Y on its satellite compare to the gravitational force FX exerted by Planet X on its satellite?
Answers
Answer:
\({FY} = \dfrac{3}{4} \times FX\)
Explanation:
The parameters given for the planets are;
The mass of planet X = M and the radius of planet X = R
The mass of planet Y = 3·M and the radius of planet Y = 3·R
The magnitude of the gravitational force of the planets on their satellites are given by the following equation;
\(F=G \times \dfrac{M_{1} \cdot m_{2}}{R^{2}}\)
Where;
M₁ = The mass of the first object = The mass of the planet
m₂ = The mass of the second object = The mass of the satellite
R = The distance between the centers of the two planets = The distance between the center of the planet and the satellite
G = The universal gravitational constant
The force between planet X and the satellite in its orbit = \(FX=G \times \dfrac{M \times m}{(2 \cdot R)^{2}} = G \times \dfrac{M \times m}{4 \cdot R^{2}}\)
The force between planet Y and the satellite in its orbit = \(FY=G \times \dfrac{3\cdot M \times m}{(4 \cdot R)^{2}} = G \times \dfrac{3\cdot M \times m}{16 \cdot R^{2}} = G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}\)
Therefore;
\(\dfrac{FY}{FX} = \dfrac{G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}}{G \times \dfrac{M \times m}{4 \cdot R^{2}}} = \dfrac{3}{16} \times \dfrac{4}{1} = \dfrac{3}{4}\)
\({FY} = \dfrac{3}{4} \times FX\)
the energy released by a nuclear fusion reaction is produced when
Answers
Answer:
atoms combine
Explanation:
How is the oxygen level of blood related to its color?
Answers
Hemoglobin bound to oxygen absorbs blue-green light, which means that it reflects red-orange light into our eyes, appearing red. That's why blood turns bright cherry red when oxygen binds to its iron. Without oxygen connected, blood is a darker red color.
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A box weighing 10 N is sitting on a surface that is tilted upward at a 45⁰ angle. The normal force is __________ 10 N.
a. equal to
b. less than
c. greater than
Answers
The normal force is less than the 10 N
Since we are given a box weight that is 10 N tilted at 45⁰, so the formula we refer from the figure to for calculating the normal force is:
N=mg⋅cos θ , where mg is the weight of the box and θ is the angle at which the box is shifted.
The flatter the incline to be, the normal force becomes greater. The littler an angle gets to be making the greater the esteem of cosine gets to be, and along these lines the greater the normal force becomes.
So, we get that the normal force will be
= 10 cos 45 (Since the value of mg is 10 N and θ = 45⁰)
= 7.07 N
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a mass is placed on a frictionless, horizontal table. a spring ( ), which can be stretched or compressed, is placed on the table. a 5-kg mass is anchored to the wall. the equilibrium position is marked at zero. a student moves the mass out to and releases it from rest. the mass oscillates in simple harmonic motion. find the position, velocity, and acceleration of the mass at time .
Answers
The position is given by \(\(x = A \cos(\omega t)\)\), velocity is \(\(v = -A \omega \sin(\omega t)\)\), and acceleration is \(\(a = -A \omega^2 \cos(\omega t)\)\).
To find the position, velocity, and acceleration of the mass at time \(\(t\)\) in simple harmonic motion, we can use the equations of motion for harmonic oscillators.
Let's denote the equilibrium position as \(\(x = 0\)\) and the initial displacement of the mass as \(\(A\)\). The angular frequency, \(\(\omega\)\), of the oscillation can be calculated by:
\(\(\omega = \sqrt{\frac{k}{m}}\),\)
where;
\(\(k\)\) = spring constant and \(\(m\)\) is the mass.
The position of the mass at time \(\(t\)\) is given by
\(\(x = A \cos(\omega t)\)\)
The velocity of the mass at time \(\(t\)\) is given by
\(\(v = -A \omega \sin(\omega t)\)\)
The acceleration of the mass at time \(\(t\)\) is given by
\(\(a = -A \omega^2 \cos(\omega t)\)\)
In this case, since the mass is initially at rest and released from rest, \(\(A\)\) is the initial displacement of the mass. As the student moves the mass out, \(\(A\)\) would be the initial displacement of the mass.
Using these equations, you can calculate the position, velocity, and acceleration of the mass at any given time \(\(t\)\) in the simple harmonic motion.
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FILL THE BLANK.
Cocaine is considered a ________ drug because it tends to increase overall levels of neural activity.
Answers
Cocaine is considered a stimulant drug because it tends to increase overall levels of neural activity. This drug stimulates the central nervous system, leading to increased energy, alertness, and elevated mood. It is a potent and addictive drug that is derived from the leaves of the coca plant.
Cocaine works by blocking the reuptake of dopamine, norepinephrine, and serotonin, which are neurotransmitters that are responsible for regulating mood and behavior. When these neurotransmitters are released, they produce feelings of pleasure and reward. Cocaine use can lead to tolerance, dependence, and addiction, as well as a range of negative health effects such as heart attack, stroke, and respiratory failure.
In conclusion, Cocaine is considered a stimulant drug because it tends to increase overall levels of neural activity.
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True or False
1. Scientists have complete knowledge of atoms and this knowledge can never change?
Answers
two forces 3N and 4N act on a body in a direction due north and due East respectively calculate their equivalent
Answers
Two forces 3N and 4N act on a body in a direction due north From East, the equilibrant's angle is given by \(\theta=\tan ^{-1} \frac{3}{4}=36.8^{\circ}\).
What are equilibrium and resultant force?The equilibrium force is the balanced force when the net force acting is zero and is the exact opposite of the consequent force. The resultant force is one single force replaced by numerous forces.
Briefing:3N and 4N are the two forces pulling on a body.
The forces work along the North and the East, which are perpendicular to one another.
The resultant of the forces, which is provided by the equilibrant force,
R = √(3)²+(4)²
R = 5N
From East, the equilibrant's angle is given by
\(\theta=\tan ^{-1} \frac{3}{4}=36.8^{\circ}\)
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Hallar la distancia que recorre una movil al cabo
de 8s si posee una velocidad de 5m/s y acelera a razón de 3 m/s
Answers
Answer:
Distancia, S = 136 metros
Explanation:
Dados los siguientes datos;
Aceleración, a = 3 m/s²
Velocidad inicial, u = 5 m/s
Tiempo, t = 8 segundos
Para encontrar la distancia recorrida, usaríamos la segunda ecuación de movimiento;
S = ut + ½at² Sustituyendo en la fórmula, tenemos;
S = 5 × 8 + ½ × 3 × 8²
S = 40 + 1,5 × 64
S = 40 + 96
Distancia, S = 136 metros
explain what you think is happening in this picture
Answers
Answer:
sorry, there is no picture, try re-uploading it with the pic
Explanation:
1. Apply a constant force of 50 N directed to the right of the 50 kg Box. (2 pts)
Hypothesis:?
Conclusion: ?
Answers
As the box is moving with a constant velocity, the two forces acting on the box are canceling each other.
Then friction force = 80 Newtons but in the opposite direction.
Friction force = Mu * Normal force exerted by ground = Mu * weight of box
So we find Mu.
Mu = coefficient of friction between box and horizontal surface
= Force of friction / weight = 80 / 50 * 9.81 = 0.163
When an identical box is placed on top, the force of friction is
= Mu * total weight = 0.163 * (50+50) * 9.81 = 159.9 Newtons
doss cheerleading have physics in it?
Answers
if you are measuring the electrical potential difference from a rectangular 9v battery, which setting should you choose for the multimeter?
Answers
If you are measuring the electrical potential difference from a rectangular 9v battery, you would choose a DC setting.
The correct setting to measure the electrical potential difference from a rectangular 9v battery is the DC volts setting on a multimeter.
This is because the battery produces Direct Current (DC) voltage, which is measured in volts (V).
When using the multimeter, you should ensure that the negative and positive leads are connected to the correct terminals on the battery, and that the multimeter is set to the correct voltage range.
This will ensure accurate readings from the battery.
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A radio wave has a frequency of 5.5 × 104 hertz and travels at a speed of 3.0 × 108 meters/second. What is its wavelength?
Answers
Answer:5.45X10^3m
Explanation:So use the formula,v= fλ
3X10^8=5.5X10^4λ what Im saying is divide both and u should get 5454.54m but do sig figs to get answer
Answer:
5.45X10^3m
Explanation:
28,800 C of charge flow through a lamp every hour. Calculate the current used by this lamp
Answers
This lamp's estimated current consumption is 8 amperes.
What is electric current ?Electric current is the rate of charge (electron) passing in a conductor. The SI unit for electric current is the ampere. As current does not obey vector addition, it is a scalar quantity.
Given information:
amount of charge flowing through the lamp, Q = 28800 C;
The charge flow time was t = 1 hour = 3600 seconds.
Hence, the current passing through the bulb as a result.
I = Q/t
= 28800/3600 ampere,
= 8 ampere
Therefore, this lamp consumes 8 amperes of current.
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Work done by STATIC FRICTION is alwaysO positive,O negative, O perpendicular to the surface along the surface. O Zero.
Answers
The right answer is (d). Static friction can cause a system to do positive, negative, or even zero work.
Does static friction ever produce zero work?
At essence, static friction can also be active when a body is in equilibrium, when there is no movement and no static frictional work to be done.
Can static friction provide useful results?
This is because our force is opposed by the force of static friction. However, since the block stays there, there is no displacement. Therefore, friction produces no work. Friction can therefore produce positive, negative, or no work.
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Given an objects momentum and velocity which equation can be used to calculate the objects mass
Answers
an objects momentum is found from
p=mv
so to find m we divide it by v which gives us
p/v=m or m=p/v
option B
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Divia is pulling a box on the floor with a force of 20 N making an angle of 600 with the horizontal. Find the horizontal and vertical components of this force? علیحد قسم ال
Answers
Answer:
see below
Explanation:
Horizontal component = 20 cos 60° N = 10 N
Vertical component = 20 sin 60° N = 17.3 N