Answers
Answer:
the speed of the astronaut is 36.78 m/s.
Explanation:
Given;
centripetal acceleration of the astronaut, \(a_c\) = 12 g = 12 x 9.8 m/s² = 117.6 m/s²
radius of the centrifuge, r = 11.5 m
The speed of the astronaut is calculated as follows;
\(a_c = \frac{v^2}{r} \\\\v^2 = a_c r\\\\v = \sqrt{a_c r} \\\\v = \sqrt{117.6 \times 11.5} \\\\v = 36.78 \ m/s\)
Therefore, the speed of the astronaut is 36.78 m/s.
Related Questions
how to calculate the magnitude and direction of vector A-vectorB
A-B
Answers
Answer:
Let vector C(x,y) be A-B.
Explanation:
Now the direction is given by: tan-1(y/x)
Use the correct angle on the basis in which quadrant the vector C lies.
Magnitude = sqrt(x^2 + y^2)
Some metals have a molecular structure that makes them good conductors. Explain how understanding this relationship can help engineers make more powerful batteries.
Answers
Answer:
Explained below.
Explanation:
Conductors can be defined as materials that permit electricity to flow through them easily.
Now, metals have a molecular structure that makes them good conductors because electrons in the atoms of these conductors tend to move freely from one atom to the other. So a majority of metals make good conductors because these metals tend to hold their electrons loosely. In short, it can help engineers make powerful batteries because then it means that they are capable of giving much more electrical energy since nowadays, advanced batteries make use of ion charges for the batteries.
It takes 10000joules to lift 100kg to its new height. What is that height? (5pts)
Answers
Answer:
Explanation: 5
A parallel circuit has four branch currents: 120 mA, 380 mA, 250 mA, and 2.1 A. How much current is supplied by the source?
Answers
A parallel circuit is an electrical circuit with more than one current path and all circuit components are connected between the same two sets of electrically common points. The current supplied by the source in a parallel circuit is equal to the sum of all branch currents in the circuit.
The sum of the branch currents in a parallel circuit can be calculated by adding up the values of the individual branch currents. In this case, we have four branch currents: 120 mA, 380 mA, 250 mA, and 2.1 A. Thus, the sum of the branch currents is:120 mA + 380 mA + 250 mA + 2.1 A= 2.85 ATherefore, the current supplied by the source in this parallel circuit is 2.85 A. This is because, in a parallel circuit, the current from the source is split between the different branches of the circuit. Each branch will have a different current, but the sum of all the branch currents will always equal the current supplied by the sourceFor such more question on parallel circuit
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In hiking, what fitness component is required of you
Answers
Một chất điểm chuyển động trong mặt phẳng Oxy với phương trình :
{ = 2 + 10
Answers
Answer:
plz write your questions in English
Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two metals?
Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons.
Sodium (Na) is more reactive than magnesium (Mg) because sodium atoms must gain more electrons.
Calcium (Ca) is less reactive than potassium (K) because potassium atoms must lose more electrons.
Beryllium (Be) is less reactive than lithium (Li) because beryllium atoms must gain more electrons.
Answers
Answer:Rubidium or answer 1
Explanation:took quiz
Answer: Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons.
Explanation: Look at the elements they are organized on the periodic table based on their properties. (A) correctly predicts and explains the chemical reactivity of two metals.
Length of spring is 8cm when mass is 4kg is hang on it its become 16cm what is its spring constant?
Answers
Answer:
constant is 500 N/m
Explanation:
Extension, e = (16 - 8) = 8 cm
Force, F = (4 × 10) = 40 N
from hooke's law:
\(F = kx \\ 40 = (k \times 0.08) \\ k = \frac{40}{0.08} \\ \\ k = 500 \: newton \: per \: metre\)
Assume a person is able to apply a maximum of 85lbs to the input piston of a car jack. The jack must be able to lift up to 6000lbs. If the jack’s output piston is 4inches in diameter. How big must the input piston be for this jack?
Answers
A reciprocating engine's piston is a crucial part. When the piston is inserted into the engine cylinder, the device is formed of a cylindrical piece of metal with piston rings that aid in creating an airtight seal.
What is Piston?A connecting rod that is linked to the crankshaft by a piston pin or gudgeon holds the piston to the engine.
The intake, compression, combustion, and exhaust processes in four-stroke (petrol and diesel) car engines occur above the piston in the cylinder head, which forces the piston to move up and down (or in and out in a horizontally opposed - or flat - engine) within the cylinder and causes the crankshaft to turn.
When the piston is moving, the oil ring removes oil from the cylinder wall, but over time, it and the other rings may wear down, allowing oil from the crankcase to enter the combustion chamber.
Therefore, A reciprocating engine's piston is a crucial part. When the piston is inserted into the engine cylinder, the device is formed of a cylindrical piece of metal with piston rings that aid in creating an airtight seal.
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for physics a circuit has a current of 2a and a potential diffrence of of 6v what is the resistence of a bulb in its circuit
Answers
The resistance of the bulb in the circuit, given that the circuit has a current of 2 A and a potential diffrence of of 6 V is 3 ohms
How do I determine the resistance of the bulb?We understood from Ohm's laws that the potential difference (V), current (I) and resistance (R) are related by the following formula:
Potential difference (V) = Current (I) × resistance (R)
V = IR
From the question given above, the following data were obtained:
Current (I) = 2 APotential difference (V) = 6 VResistance (R) = ?Applying the above formula, we can obtain the resistance of the bulb can be obtained as shown below:
Potential difference (V) = Current (I) × resistance (R)
6 = 2 × resistance
Divide both sides by 2
Resistance = 6 / 2
Resistance = 3 ohms
Thus, from the above calculation, we can conclude that the resistance of the bulb is 3 ohms
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. When a parallel plate capacitor is connected to a 12 V battery, each plate requires a charge of magnitude 0.0024 C. Find its capacitance. If the capacitor is connected to 24 V battery, will its capacitance increase? Why?
Answers
The capacitance of the capacitor is 1.7 * 10^-4 F. The capacitance will increase when the voltage is increased.
How does the capacitance relate to the magnitude of the voltage?If we hold the capacitance constant, a higher voltage applied to the capacitor will result in a greater amount of electrical charge stored on the capacitor. Conversely, if we hold the voltage constant, a capacitor with a higher capacitance will be able to store more electrical charge. In other words, the capacitance and the voltage are directly proportional to the amount of electrical charge that can be stored on a capacitor.
We know that;
q = CV
C = q/V
C = 0.0024 C/12 V
C = 1.7 * 10^-4 F
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which of the following statements is correct about the magnitude of the static friction force between an object and a surface?
Answers
None of the above statements are correct related to statement about the magnitude of the static friction between an object and surface.
What is meant by static friction?Static friction is a force that opposes the motion of an object that is at rest and in contact with a surface. When an object is placed on a surface, the surface exerts a force on the object in the direction perpendicular to the surface, which is known as the normal force. If a force is applied to the object in a direction parallel to the surface, but the object does not move, the surface exerts an equal and opposite force, known as the static friction force, to prevent the object from sliding.
The magnitude of the static friction force depends on the coefficient of static friction between the two surfaces in contact and the normal force pressing the object and surface together. The coefficient of static friction is a property of the two surfaces and is a measure of the force required to start sliding the object along the surface. If the force applied to the object in a parallel direction is less than the maximum force of static friction, the object will remain at rest. Once the applied force exceeds the maximum force of static friction, the object will start to move, and kinetic friction will take over to oppose the motion.
The magnitude of the static friction force between an object and a surface does not depend on the mass of the object, the shape of the object, or what the object is made of.This means that the force required to start an object moving does not depend on the object's mass, shape, or material. The only things that matter are the coefficient of static friction and the normal force.
It depends on the coefficient of static friction between the object and the surface.The coefficient of static friction is a value that depends on the two surfaces in contact. It represents the force required to start an object moving relative to the surface. The higher the coefficient of static friction, the more force is required to start the object moving.
The normal force is the force that the surface exerts on the object perpendicular to the surface.When an object is resting on a surface, the surface exerts a force on the object perpendicular to the surface. This is called the normal force. The magnitude of the normal force is equal to the weight of the object, which is the force with which the object is pulled downwards by gravity.
If the force applied to the object in a parallel direction is less than the maximum force of static friction, the object will remain at rest.If the force applied to the object is less than the maximum force of static friction, the object will not move. The force of static friction is proportional to the normal force, so the maximum force of static friction is equal to the coefficient of static friction times the normal force.
Once the applied force exceeds the maximum force of static friction, the object will start to move, and kinetic friction will take over to oppose the motion.Once the applied force exceeds the maximum force of static friction, the object will start to move. At this point, the force of static friction is no longer applicable, and kinetic friction takes over. Kinetic friction is the force that opposes the motion of the object and is generally less than the force of static friction.
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Which of the following statements is correct about the magnitude of the static friction force between an object and a surface?
Static friction depends on the mass of the object. Static friction depends on the shape of the object. Static friction depends on what the object is made of but not what the surface is made of. None of the above is correct.1. Two charges are separated by a distance of 1 cm. One charge has a value of 7 micro Coulombs. The other charge has a value of 10 micro Coulombs. What is the force between them, in pounds. Make sure to include the sign of the force which will be positive if the charges repel each other and negative if they attract each other.
2. 12 gauge copper wire is normally used in house wiring. When aluminum wire is used one needs to use a smaller gauge size to obtain the same resistance, 40 ft of 12 gauge copper wire was calculated. What would the resistance be if 10 gauge aluminum wire were used?
3. A 12 V automobile battery can supply 51 amps for one hour and cost $194. What is the cost of this electricity in cents per kWh?
4. Most of the body's resistance is in its skin. When wet, salts go into ion form, and the resistance is lowered. Thus, the resistance of the skin can go from 100,000 ohms when dry to 300 ohms when wet. What is the current that would be carried through the body, in milliAmperes, if you touched a 240 V power line while dry? Currents over 10 mA are almost always deadly.
Answers
1. The force between the two charges is 1.78 × 10⁻⁵ pounds, with opposite signs indicating attraction between the charges.
2. The resistance of 10 gauge aluminum wire over a 40 ft distance would be 0.506 ohms.
3. The cost of electricity from the automobile battery is 38.6 cents per kWh.
4. The current that would be carried through the body is 0.8 mA if dry.
1. The force between two point charges can be calculated using Coulomb's law, which states that the force is proportional to the product of the charges and inversely proportional to the square of the distance between them.
Using the values given, the force can be calculated as F = (k * q1 * q2) / r², where k is Coulomb's constant, q1 and q2 are the charges, and r is the distance between them. Plugging in the values, the force can be calculated as 1.78 × 10⁻⁵ pounds, with opposite signs indicating attraction between the charges.
2. The resistance of a wire is determined by its length, cross-sectional area, and resistivity. The resistivity of aluminum is higher than that of copper, so a larger cross-sectional area is required to achieve the same resistance. Using the gauge size conversion chart, 10 gauge aluminum wire has a cross-sectional area of 5.26 mm², which is approximately 83% of the cross-sectional area of 12 gauge copper wire.
Thus, the resistance of 10 gauge aluminum wire over a 40 ft distance can be calculated as R = (rho * L) / A, where rho is the resistivity of aluminum, L is the length, and A is the cross-sectional area. Plugging in the values, the resistance can be calculated as 0.506 ohms.
3. To calculate the cost of electricity per kWh, the total cost and the total amount of energy supplied must be known. Since the battery supplies 12 V and 51 A for one hour, the total energy supplied can be calculated as E = V * I * t, where V is the voltage, I is the current, and t is the time.
Plugging in the values, the total energy supplied can be calculated as 612 watt-hours (Wh). Since one kWh is equal to 1000 Wh, the total energy supplied can be converted to 0.612 kWh. Dividing the total cost by the total energy supplied gives the cost per kWh, which is 38.6 cents.
4. The current through the body can be calculated using Ohm's law, which states that current is equal to voltage divided by resistance. Using the values given, the resistance can be either 100,000 ohms or 300 ohms depending on whether the skin is dry or wet.
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a particle moving along the x-axis is acted upon by a conservative force fx(x). at a certain point, the force is zero. which of the following statements about the value of the potential energy function, u(x), at that point is correct? a) U(x) < 0 b) U(x) > 0 c) U(x) = 0 d) Not enough information given to decide
Answers
This implies that the change in potential energy between this point and any other point is also zero. In other words, the potential energy function is constant at this point. The correct statement is (c) U(x) = 0.
At a certain point, the force is zero. To determine the correct statement, we need to recall the relationship between force, work, and potential energy. According to the work-energy principle, the work done by a force on a particle is equal to the change in the particle's kinetic energy.
When the force is conservative, we can define a potential energy function, U(x), such that the work done by the force on a particle moving between two points is equal to the change in potential energy between those points. Mathematically, this is expressed as follows:
W = ΔK = -ΔU
where W is the work done by the force, ΔK is the change in the particle's kinetic energy, and ΔU is the change in the particle's potential energy.
We are given that the force acting on the particle is conservative, so we can define a potential energy function, U(x), associated with the force. At a certain point, the force is zero, which means that the work done by the force is also zero. This implies that the change in potential energy between this point and any other point is also zero. In other words, the potential energy function is constant at this point. Therefore, U(x) = 0.
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CHANGING STATES OF MATTER
As substances gain or lose energy their state, or phase, of matter changes,
STATE OF MATTER
Sublimation
Deposition
Condensation
Answers
Answer:
condensation and deposition
Explanation:
when something gets cooler it's molecules lose kinetic energy and that applies only in condensation and depostion
The input and output forces for four machines are shown in the table. Machine Forces Machine Input Force (N) Output Force (N) 1 5 50 2 10 50 3 25 50 4 50 50 Which machine would have the greatest mechanical advantage? Responses 1 1 2 2 3 3 4
Answers
Machine 1 has the greatest mechanical advantage among the given machines. To determine the machine with the greatest mechanical advantage, we need to calculate the mechanical advantage for each machine.
Machine 1: Mechanical Advantage = Output Force / Input Force = 50 N / 5 N = 10
Machine 2: Mechanical Advantage = Output Force / Input Force = 50 N / 10 N = 5
Machine 3: Mechanical Advantage = Output Force / Input Force = 50 N / 25 N = 2
Machine 4: Mechanical Advantage = Output Force / Input Force = 50 N / 50 N = 1
Comparing the mechanical advantages, we can see that Machine 1 has the highest mechanical advantage of 10. This means that Machine 1 can multiply the input force by 10 to produce the output force. It provides the greatest amplification of force among the four machines.
Machine 2 has a mechanical advantage of 5, Machine 3 has a mechanical advantage of 2, and Machine 4 has a mechanical advantage of 1. Therefore, Machine 1 has the greatest mechanical advantage among the given machines.
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As a ball falls freely toward the ground, its kinetic energy
Answers
Answer:
increases.
Explanation:
As a ball falls freely towards the ground, it's kinetic energy increases. If the kinetic energy increases, that means the object hasn't hit the bottom yet. If the ball continues to fall freely towards the ground, the air gives it more pressure, after that the pressure begins to increase.
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The number of protons in the nucleus of an atom determines the species of the atom, i.e., the element to which the atom belongs. An atom has the same number of protons and neutrons. But the electron number cannot be used instead because (5 points)
a. electrons are not within the nucleus
b. electrons are negatively charged
c. electrons can be removed from or added to an atom
d. electrons are lighter than protons
Answers
The electron number cannot be used instead because electrons can be removed from or added to an atom (option C)
Why the electron number cannot be used instead?The element of an atom is determined by its proton count, while the electron count can exhibit variability. Take, for instance, a sodium atom, which encompasses 11 protons and 11 electrons. However, it has the capacity to relinquish one electron, transforming into a sodium ion housing only 10 electrons.
This occurs due to the relatively loose binding of electrons to the nucleus, enabling their removal through the influence of an electric field or alternative mechanisms.
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If the kinetic energy of a given mass is to be doubled, its speed must be multiplied by
1) 4
2) 2
3) 8
4) 2
Answers
Answer:
Either B or D. The answer itself is 2.
Explanation:
The equation for the kinetic energy would be 1/2*mv^2.
When m is doubled, we can plug in 1 and 2 to compare our answers.
Plugging in 1 for mass would give us the answer 1/2*v^2.
Plugging in 2 for mass would give us v^2. This means that the velocity was multiplied by 2, meaning that the answer is it is multiplied by 2.
I am not sure which answer is correct since there seems to be two answer choices with 2 in it, but the answer is either B or D (I will call it ABCD because I do not want to cause confusion by saying 2 multiple times).
calculate the KE of a car which has a mass of 1000 kg and is moving at the rate of 20 m/s
Answers
Answer:
The kinetic energy of the car is \(2.0\cdot 10^5 J\)
Explanation:
how would a small bar magnet be oriented when placed at position x ? option c is wrong.
Answers
Answer:
B
Explanation:
please respond my question
Answers
The astronomy of the star and the parameters of the star in terms of solar units are;
Radius of the star ≈ 5.03 \(R_{Sun}\)
Temperature of the star ≈ 0.92 \(T_{Sun}\)
Luminosity of the star ≈ 18 \(L_{sun}\)
What is the system for astronomy units?The astronomical system of units are a special class of units designed for astronomy.
First part;
One solar radius is specified as \(R_{Sun}\) = 6.9551 × 10⁵ km
The radius of the star = 3.50 × 10⁶ km
The radius of the star in units of the solar radius is therefore;
Radius = 3.50 × 10⁶ km ÷ (6.9551 × 10⁵ km) \(R_{Sun}\) ≈ 5.03 \(R_{Sun}\)Second part;
One unit of the solar temperature, \(T_{Sun}\) = 5777 K
The temperature of the star = 5305 K
The stars temperature in units of the solar temperature, is therefore;
Temperature = 5305 K/(5777 K) ≈ 0.92
The temperature of the star in units of the solar temperature is 0.92 \(T_{Sun}\)Third part;
The function for the luminosity of a star, L, is; L = 4·π·R²·σ·T⁴
The luminosity of the star = 4 × π × (3.50 × 10⁶)² × σ × 5305⁴
The luminosity of the Sun = 4 × π × (6.9551 × 10⁵)² × σ × 5777⁴
The solar luminosity of the star = (4 × π × (3.50 × 10⁶)² × σ × 5305⁴) ÷ (4 × π × (6.9551 × 10⁵)² × σ × 5777⁴) ≈ 18
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What is the resistance of a carbon rod at 25.8 ∘C if its resistance is 0.0200 Ω at 0.0 ∘C ?
Answers
0.02020 ohm is the resistance of a carbon rod at 25.8 ∘C if its resistance is 0.0200 Ω at 0.0 ∘C.
What is a resistor?A resistor is an electrical component that controls or restricts how much electrical current can pass across a circuit in an electronic device. A specified voltage can be supplied via resistors to an active device like a transistor.
The temperature of the resistor varies based on the variation in the temperature. The equation that describes the relationship between the two of them is:
R = R0[1+ alpha(T-T0)] where:
R is the new resistance we are looking for
alpha is the temperature coefficient of resistance. For carbon rod, alpha = ₋ 4.8 x \(10^{-4}\)(1/°c)
T0 is the standard temperature =25.8°C
R0 is the resistance at T0 = 0.0200 ohms
T is the temperature at which we want to get R = 0
Substitute in the equation to get R as follows:
R = 0.0200 [1+( ₋ 4.8 x \(10^{-4}\)) (0-25.8)] = 0.02020 ohm
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The total resistance of a parallel circuit is 25 ohms. If the total current is 100mA, how much current is through a 220 ohm resistor that makes up part of the parallel circuit?
Answers
Answer:
The current across the resistance is 0.011 A.
Explanation:
Total resistance, R = 25 ohms
Total current, I = 100 mA = 0.1 A
Let the voltage is V.
By the Ohm's law
V = I R
V = 0.1 x 25 = 2.5 V
Now the resistance is R' = 220 ohm
As they are in parallel so the voltage is same. Let the current is I'.
V = I' x R'
2.5 = I' x 220
I' = 0.011 A
6a. A special lamp can produce UV radiation. Which two statements
describe the electromagnetic waves emitted by a UV lamp? *
They have a higher frequency than X-rays.
They have the same wave speed as visible light
They have a longer wavelength than microwaves.
They have a lower frequency than gamma rays.
They have a greater wave speed than radio waves.
Answers
Answer:
The correct options are:
B) They have the same wave speed as visible light
D) They have a lower frequency than gamma rays.
Explanation:
B) Ultraviolet rays, commonly known as UV rays, are a type of electromagnetic ways. As electromagnetic waves, in the layman's term, are all kinds of life that can be identified, all electromagnetic waves (UV rays, visible light, infrared, radio etc) all travel with the same velocity, that is the speed of light, given as v = 3 × 10⁸ m/s
D) The frequency of all electromagnetic rays can be found by electromagnetic spectrum (picture attached below).
We can clearly see in the picture that the frequencies of UV rays lie at about 10¹⁵ - 10¹⁶ Hz which is lower than the frequency of Gamma ray, which lie at about 10²⁰ Hz.
I have a material thats 65 cubic feet totaling 40000 cubic yards. How many dump trucks will it take to haul this material?
Answers
It will take about 2,500 dump trucks to haul the material. Assuming the capacity of the dump truck is 16 cubic yards.
Note: A standard dump truck is between 10 -16 cubic yards.
1 cubic yard = 27 cubic feet.
from the question:
40,000 cubic yards= 65 cubic feet
hence,
Assuming the dump truck capacity is 16 cubic yards
Then,
number of dump trucks = 40,000 cubic yards/16 cubic yards
=2,500
Therefore a dump truck of 16 cubic yards capacity, will need about 2,500 dump trucks to haul the material totaling 40,000 cubic yards.
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When energy is conserved or transferred, some energy becomes unavailable to do useful work. What happened to the unavailable energy?
Answers
Some energy in a body is unavailable to do useful work. According to second law of thermodynamic, unavailable energy is quantified as the . the increase in entropy.
What is second law of thermodynamics?According to second law of thermodynamics, the heat is flowing from a hot body to colder body. This heat transfer from hot to cold, for instance, is related to nature's tendency for disorganized systems and a lack of energy available for labor.
It has been demonstrated that a system's entropy is a measurement of its disorder and the lack of energy for work.Entropy is a measurement of the amount of energy that cannot be used for labor.
Even if all kinds of energy are interconvertible and all of them can be utilized to do work, it is not always feasible to employ all of the available energy for labor, even in theory.
The study of thermodynamics is interested in this unusable energy because efforts to turn heat into work gave rise to the discipline.
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which substance do plants use to make energy
Answers
Answer:
sugar
Explanation:
To better understand crash dynamics we have to look at "__________."
A. the law of gravity
B. Bernoulli's principle
C. the laws of motion
D. Archimedes' principle
Answers
To better understand crash dynamics we have to look at "the laws of motion."
The laws of motion
The laws of motion were introduced by Sir Isaac Newton in 1687 in his book Philosophiæ Naturalis Principia Mathematica ("Mathematical Principles of Natural Philosophy"), which defined the laws of motion, or three fundamental laws that govern the movement of bodies. The laws of motion, according to Newton, govern the motion of an object or a system of objects that interact.
It defines the concepts of force and mass, and the fundamental dynamics of motion.The following are the laws of motion:Every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. The velocity of an object changes proportional to the force applied to it, and the acceleration of an object is proportional to both its force and its mass. For every action, there is an equal and opposite reaction.
Therefore, these laws are necessary to fully grasp crash dynamics because they explain how objects respond to outside forces that cause them to accelerate or decelerate.
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How many feet up high should I be required to wear a harness?
Answers
Answer:
About 6 feet or higher is recommended.
Explanation