One of the most important features that must be explained by models during the formation of the galaxy is the difference in age and metallicity of stars.
What is Metallicity of stars?This is defined as the proportion of heavy elements present in a star and they are usually heavier than hydrogen or helium.
These elements and the age of stars have to be put into consideration when discussing the formation of the galaxy.
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What is the final temperature of 0.1 kg of water initially at 22 *C after 10 kj of heat is added
The final temperature of the given mass of water at the initial temperature is 45.8 ⁰C.
Change in temperature of the waterThe change in temperature of the water is calculated as follows;
Q = mcΔθ
Δθ = Q/mc
where;
c is specific heat capacity = 4200 J/kgCΔθ = (10,000)/(0.1 x 4200)
Δθ = 23.8
Final temperatureT2 - T1 = 23.8
T2 = 23.8 + 22
T2 = 45.8 ⁰C
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Two people start at the same place and walk around a circular lake in opposite directions. one has an angular speed of 1.11 x 10-3 rad/s, while the other has an angular speed of 8.40 x 10-3 rad/s. how long will it be before they meet
The time taken before the two people will meet is 11 minutes.
Time taken before they meetThe time taken before the two people will meet is calculated from the principle of relative velocity.
(ω₁ + ω₂)t = θ
where:
ω₁ is angular speed of the first personω₂ is the angular speed of the second persont is time of motionθ is angular displacement(1.11 x 10⁻³ + 8.4 x 10⁻³)t = 2π
(9.51 x 10⁻³)t = 2π
t = 2π/9.51 x 10⁻³
t = 660.7 secs
t = 11 mins
Thus, the time taken before the two people will meet is 11 minutes.
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Describe how a star is formed?
____________________________
Answer:
Star Formation
Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction.
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What concurrent motion at the glenohumeral joint should occur with shoulder abduction?
Glenohumeral external rotation is the concurrent motion at the glenohumeral joint which occurs with shoulder abduction.
What is Shoulder abduction?
This refers to the process in which the arm is moved away from the body which also affects the ball and socket joint.
This is referred to as glenohumeral joint in this case which moves in an external rotation manner.
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what is the difference between an sa and an sb galaxy? (select all that apply.)
The difference between an sa and sb galaxy is Sa has a larger nucleus and more tightly wound arms than an Sb.
What is sa Galaxy?Sa galaxies are normal spirals that have narrow, tightly wound arms, which usually are visible because of the presence of interstellar dust and, in many cases, bright stars.
What is sb Galaxy?The arms of sb galaxy are more widely spread than those of the Sa variety and appear less smooth.
Thus, the difference between an sa and sb galaxy is Sa has a larger nucleus and more tightly wound arms than an Sb.
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Who is responsible of refraction light 1/3 in eye
The cornea is responsible of refraction light 1/3 in eye.
What is the function of the cornea?In addition to the protective function, it plays a fundamental role in the formation of vision. Transparent, it works like a lens over the iris, focusing light from the pupil towards the retina.
Normally, the cornea and lens deflect (refract) incoming light rays, focusing them on the retina. The shape of the cornea is fixed, but the lens changes shape to focus on objects at different distances from the eye.
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What kind of eclipse occurred at the beginning of the week, bringing a colorful sight to stargazers in the americas, africa, europe, and parts of asia?.
Answer:
none
Explanation:
A 0.2 kg ball is attached to a string and whirled around in a circle overhead. The string breaks if the force on it exceeds 80 N. What is the maximum speed the ball can have when the radius of the circle is 1m?
Answer:
added in picture
Explanation:
added in the picture
Nuclear power stations convert the nuclear energy stored in nuclear fuel into what other store of useful energy?
Answer:
The right answer is "thermal energy" or "thermal" or "heat" or "heat energy" or "electricity" or "electrical energy"
Explanation:
Nuclear fuel is used to heat water, increasing its thermal energy. This hot water is used to turn turbines that generate electrical energy.
Nuclear power stations convert the nuclear energy stored in nuclear fuel into thermal energy.
What is thermal energy?
Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.It has 3 types conduction, convection and radiation.
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When the humerus moves in the glenoid fossa, the moving joint surfaces are:
When the humerus moves in the glenoid fossa, the moving joint surfaces are convex on concave.
What is Glenoid fossa?This is a bone depression in which the head of the humerus fits into to aid movement and support.
The moving joint surfaces are convex on concave in structure when humerus moves in the glenoid fossa.
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A ball is dropped from rest from the top of a high building. Ignore air resistance and take g = 9,8 m/s² calculate speed of the ball after 1sec.
The speed of the ball after one second is obtained as 9.8 m/s.
What is the speed after 1 second?We know that since the ball dropped from a height, its initial velocity is zero.
Thus we have;
u = 0 m/s
v = ???
g = 9,8 m/s²
t = 1sec
Given that;
v = u + at
v = at
v = 9,8 m/s² * 1sec
v = 9.8 m/s
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please who can give me the definition of density in terms of Archimedes principle.
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The weight of the fluid displaced is equal to the buoyant force on a submerged object. The mass divided by the volume thus determined gives a measure of the average density of the object.write short notes on:
human made wetland
Any type of wetland that has been developed or maintained by humans for uses such as aquaculture, irrigation, or water storage.
What is a human-made wetland ?Any kind of wetland that has been created or kept up by people for purposes like water storage, irrigation, or aquaculture.
In India's Punjab state, in the Kapurthala district, lies the man-made Kanji Wetland, which includes the Kanji Lake.
In order to give irrigation facilities to the hinterland, it was built by building the headworks over the perennial Bien River, a tributary of the Beas River.
The Sunderbans are India's biggest wetland. The world's biggest mangrove forest includes Sunderban Wetland.
Hence, the human-made wetland is an artificial wetland.
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What change occurs to the mass of an object when an unbalanced force is applied to it
Where will the strongest force be excerted by the scissor blades to cut through a piece of material? Explain your answer.
Answer:
in the thick part of the scissors ✂️
Explanation:
because in physics simple machine called wedge the force applied in this thick area it have thine side used to split or piece objects
one of the rare galaxies that is isolated in space is likely to be a(n) ____.
The rarest type of galaxies is the elliptical double-ringed galaxy.
What is the rarest type of galaxy?elliptical double-ringed galaxy is considered as the rarest type of galaxy because of its small number. The example of such type of galaxy is PGC 1000714. Scientists suggest that about 0.1% of galaxies are of this type.
So we can conclude that the rarest type of galaxies is the elliptical double-ringed galaxy.
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what kinds of investigations might have led to our current understanding of matter and energy? why is it important for scientists to use the same scientific method and consistent measurement units?
The kind of investigations might have led to our current understanding of matter and energy is research and measurement.
It is important for scientists to use the same scientific method and consistent measurement units in order to get the correct value while analayzing.
What is matter?The matter has volume and space occupied.
When conceivable the researcher endeavors to test his speculations via painstakingly planned and controlled tests that will yield quantitative instead of subjective outcomes.
Thus, the kind of investigations might have led to our current understanding of matter and energy is research and measurement.
It is important for scientists to use the same scientific method and consistent measurement units in order to get the correct value while analayzing.
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The potential difference across the ends of a wire is doubled in magnitude. If ohm’s law is obeyed, which one of the following statements concerning the resistance of the wire is true?.
The potential difference across the ends of a wire is doubled in magnitude. If ohm’s law is obeyed, the resistance is not changed. Thus, option A is correct.
What is current?The current is the stream of charges which flow inside the conductors when connected across the end of voltage.
From Ohm's law, V =IR
Here, R is the proportionality constant called the resistance of the resistor.
The complete question is given in the image attached.
The potential difference across the ends of a wire is doubled in magnitude.2V = IRR =2 V/IAs, the resistance is a constant value, it does not change.
The following statements concerning the resistance of the wire true is :
The resistance is not changed
Thus, the correct option is A.
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When you see a quantity like 20 m/s N, how do you know that it's a vector quantity and not a scalar quantity?
We know that 20 m/s N is a vector quantity because N in the expression signifies the direction
What is a vector quantity?This is a which have both magnitude and direction. Example include:
VelocityDisplacementForceAccelerationMomentWeightHow to determine whether 20 m/s N is a vector quantity20 m/s indicates just the speed i.e magnitude20 m/s N indicates the speed i.e magnitude why the N indicates the direction.Thus, we can conclude that 20 m/s N is a vector quantity because it has both magnitude and direction.
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which type of radio active decays
Could you sky-dive on the Moon? Why or why not?
Answer:
no
Explanation:
the moon's force of gravity is not strong enough to pull you down compared to earth, so you will just float
which statement illustrates how progress in engineering has affected the natural enironment
The statement that illustrates how progress in engineering has affected the natural environment is extracting mineral resources with modern mining equipment removes fertile topsoil.
What is the Natural Environment?The natural environment may be defined as anything that can be present in the surroundings of living entities whether it is a biotic or abiotic factor.
The utilization of contemporary mining tools terminates fertile topsoil and admiringly impacts the fertility of the soil. It is tough to rebuild topsoil and modern mining tools constantly damage soil fertility.
Advancement in engineering has influenced the natural environment and mining is one of the most accepted measures of this.
The complete question is as follows:
Extracting mineral resources with modern mining equipment removes fertile topsoil.Mining companies use modern equipment to extract mineral resources more efficiently.Modern mining equipment has improved the health and safety of workers.Modern mining practices provide materials that can be used for technological advances.Therefore, it is well described above.
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Angular acceleration in the spin cycle of a clothes washer, the drum turns at
635 rev/min. if the lid of the washer is opened, the motor is turned off. if the drum
requires 8.0 s to slow to a stop, what is the angular acceleration of the drum?
The angular acceleration is 531. 98 rad/s
How to calculate angular accelerationUsing the formula:
Angular acceleration = change in angular velocity / change in time taken
Angular velocity = 635 rev/ min, covert to rad/ sec
The frequency in radians per second is equal to the revolutions per minute multiplied by 0.10472
Then angular velocity in rad/sec = 635 * 0.10472 = 66. 4972 rad/sec
time = 8. 0s
Substitute into the formula
Angular acceleration = 66. 4972 / 8. 0
Angular acceleration = 531. 98 rad/s²
Thus, the angular acceleration is 531. 98 rad/s²
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A velocity-time graph can give you
A. Displacement of the moving object
B. Acceleration, displacement, and velocity.
C. Velocity of the moving object
D. Acceleration of the moving object
Answer:
A). Velocity time graph gives displacement..The area under V-t graph gives displacement.
More to know -
Velocity = speed/ time
it's speed with direction.
acceleration = rate of change of velocity
A velocity-time graph provides information about the motion of an object over time Acceleration, displacement, and velocity. The correct option is option (B).
Acceleration: The slope of the velocity-time graph represents the object's acceleration. A positive slope indicates positive acceleration (speeding up), a negative slope indicates negative acceleration (slowing down or decelerating), and a flat line indicates zero acceleration (constant velocity).
Displacement: The area under the velocity-time graph represents the displacement of the object. By calculating the area between the graph and the time axis, we can determine the total displacement.
Velocity: The graph directly shows the object's velocity at different points in time. The vertical position of the graph at any given time represents the object's instantaneous velocity.
Therefore, a velocity-time graph can provide information about the acceleration, displacement, and velocity of the moving object. The correct option is option (B).
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A girl at a state fair swings a ball in a vertical circle at the end of a string, the force of the string at the bottom is: A-Less than the weight of the ball B-greater than the weight of the ball C-equal to the weight of the ball D-Zero
Can someone pls answer this question with brief explanation?
The force of the string at the bottom is greater than the weight of the ball. The correct option is B.
What is Net force?When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
A girl at a state fair swings a ball in a vertical circle at the end of a string.
When the ball is at the bottom . the force acting will be
The tension in the string , T = mass x centripetal acceleration + Force of gravity
So, T = m x ac + mg
Thus, the force of the string at the bottom is greater than the weight of the ball.
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Which relationship gives the value of r when r3 is adjusted so that the voltmeter reading is zero?.
Ohm's Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit.
Equation :
To students of electronics, Ohm's Law (E = IR) is as fundamentally important as Einstein's Relativity equation (E = mc²) is to physicists.
E = I x R
When spelled out, it means voltage = current x resistance, or volts = amps x ohms, or V = A x Ω.
NOTE : Because resistance cannot be measured in an active circuit, Ohm's Law is particularly helpful when determining resistance. The aforementioned application of Ohm's Law allows a technician to calculate R without having to turn the circuit off to measure resistance.
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A downward force of magnitude 5 n is exerted on the book by the force of.
Answer:
A downward force of magnitude 5 N is exerted on the book by the force of ... Do the downward force in Part A (gravity) and the upward force in Part B ...
force of 5000N is acting on a body of mass 50kg if force of friction on the body is 100N. Calculate how long it takes for the body to gain the velocity of 50m/s from rest
Answer:
.5102 s
Explanation:
Net force acting to accelerate the body is 5000- 100 = 4900 N
F = ma
4900 N = 50 kg * a then a = 98 m/s^2
v= at
50 m/s = 98 m/s^2 t then t = 50/98 =.5102 s
kepler’s second law of planetary motion states ""a line from a planet to the sun sweeps over equal areas in equal intervals of ____.""
Kepler's second law of planetary motion states, 'a line from a planet to the sun sweeps out equal areas in equal intervals of time.'
What are Kepler's laws of planetary motion?Kepler's three laws of planetary motion include
All planets orbit the sun in elliptical orbits with the sun as the focusA line from a planet to the sun sweeps out equal areas in equal intervals of timeThe square of the period of any planet is directly proprtional to the cube of the semi-major axis of its orbit.From the second law, we see that, a line from a planet to the sun sweeps out equal areas in equal intervals of time.
So, Kepler's second law of planetary motion states, 'a line from a planet to the sun sweeps out equal areas in equal intervals of time.'
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A doctor has a patient blow on one side of a U-shaped tube that is partially filled with water and has a ball floating on the other side, as shown in the image below. If the ball rises with a force of 150 N, what pressure did the patient apply to his side of the tube?
A.
0.15 Pa
b.
150Pa
c.
100,000 Pa
D.
150,000 Pa
The patient apply pressure to his side of the tube is 15 x 10⁴ N/m². The correct option is D.
What is pressure?The pressure is the amount of force applied per unit area. It is represented as
Pressure p = Force/Area
Given is a doctor has a patient blow on one side of a U-shaped tube that is partially filled with water and has a ball floating on the other side. The ball rises with a force of 150 N. The cross section are of the tube is 0.001 m³
The pressure applied is
p = 150 /0.001
p = 15 x 10⁴ N/m²
Hence, the patient apply pressure to his side of the tube is 15 x 10⁴ N/m².
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