Ball bearing roller is considered a better option for the pocket doors as compared to the top hung rollers due to reason of friction.
What is friction?Friction is the force defying the relative side(tangential) motion of solid surfaces, fluid layers, or material elements in contact. It's generally subdivided into several kinds. Friction isn't a fundamental force, as it's deduced from electromagnetic force between charged particles, including electrons, protons, atoms, and molecules.
A ball bearing roller is generally considered to be the quietest type of roller for pocket doors. This is because the ball bearings in the roller allow for smooth, low-friction movement, which reduces noise and wear on the door and track. Frictionless or silent pocket door rollers, such as those using a track with a recirculating ball bearing, would also be very quiet. Top hung rollers also have the advantage of not having any contact with the floor and less noise.
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a positive and a negative charge, each of magnitude 1.5 x 10-5 c, are separated by a distance of 15 cm. find the force on each of the particles.
15 cm separates a positive charge from a negative charge that are both 1.5 x 10-5 c in size. determine each particle's force. It exerts a force of about -89.9 N.
How much is one coulomb?The quantity of charge carried by a discharge of one amp for one second is measured in coulombs, which is the unit of measurement used in the SI for electric charge. It may also be a quality of a substance that causes electromagnetic and electrical effects to occur. The symbol for it is C. According to math, 1 Coulomb equals 1 Ampere x 1/sec.
What are ions, both positive and negative?Positively and negatively charged particles both exist in the universe. Positive ions are particles which have already lost three or more electrons, to put it simply.
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assume that an mx missile goes from rest to a suborbital velocity of 6.50 km/s in 30.0 s (the actual speed and time are classified). what is its average acceleration in m/s2?
216.66 m/s² is average acceleration of mx missile.
Given information:
initial velocity, u = 0m/s
final velocity, v = 6.5km/s = 6500 m/s
time taken, t = 40s
To calculate average acceleration:
a = [tex]\frac{( v - u)}{t}[/tex]
a = [tex]\frac{(6500 - 0)}{30}[/tex]
a = 216.66 m/s²
Acceleration at any moment is defined as rate of change of haste with time. For the entire trip, average acceleration is defined as rate of change in haste with time taken.
When an object peregrination at a vertical speed of about,000 km/ hr or further, it goes into route once it's above the atmosphere. The satellites need to reach that threshold speed (orbital haste) in order to circumvent Earth.
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A ball of mass 500 g is dropped from rest from a height of 7 m. what is its speed as it reaches the ground? (g = 9.8 m/s2)
The speed of the ball when it reaches the ground is 11.71 m/s, when the mass of the ball is 500g and height is 7m.
What is mass?The best way to define mass is the quantity of matter that constitutes an object or body. Every object in our environment is made of mass. Even air has mass, as do a table, a chair, your bed, a football, a glass, and so on. Having said that, whether an object is light or heavy depends on its mass.
The most fundamental characteristic of matter is its mass, which is also one of the fundamental quantities in this physics lesson. The term "mass" refers to a body's total amount of matter. The kilogramme, which is the SI unit of mass, is the kilogramme (kg).
the final velocity is the speed of the ball when it reaches the ground
i.e.
v²-u² =2as
v²-(0)² = 2(9.8)(7)
v²- 0 = 137.2
v = √137.2
v = 11.71
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when you used a stiffer or tighter elastic material, what effect did this have on the duration of the impulse? what effect did this have on the maximum size of the force? can you develop a general rule from these observations?
The use of a stiffer or tighter elastic material caused the duration of the impulse to be shorter, making the maximum force larger.
The general rule that can be formed would be that the shorter the time, the larger the force is to achieve the same impulse.
We can define it by impulse- momentum theorem.
Ft = mΔv( also, Ft = impulse)
F = mΔv/ t
Impulse is commensurable to the constant net force acting on an object and the time period that the net force acts.
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What were the main stages of the space race (USA/USSR)? I am looking for around 6-8 but i don’t want to miss anything out, so you can go over this. Also, please include anything extra you think is necessary.
The first collaborative Apollo-Soyuz mission is launched as US-USSR tensions ease on 15th July 1975. This is the final stage of the space race.
What is space race?The Soviet Union (USSR) and the United States competed in the Space Race during the 20th century (US). Both were vying for control of space flight technologies. When the Soviet Union responded to the US' disclosure of its intention to launch artificial satellites on August 2, 1955, the competition officially began.
German missile technology and scientists from their missile program were helpful to both sides. The Space Race resulted in ground-breaking attempts to launch artificial satellites, as well as lunar missions and human spaceflights to the Moon, Venus, and Mars.
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calculate the de broglie wavelength of an electron accelerated from rest in an electric potential of 1.0 mv. how would the resolution of an electron microscope that uses this source differ from the em discussed in example 9.1?
The de Broglie wavelength of an electron accelerated from rest in an electric potential of 1.0 mV is 1.24 x 10⁻¹¹ m. This resolution is lower than the electron microscope discussed in example 9.1.
What is electron?Electron is a subatomic particle that carries a negative charge and is a fundamental building block of matter. Electrons are found in atoms and are responsible for chemical bonding and electrical conductivity. Electrons also interact with other particles to form a variety of forces, such as the electromagnetic force and the weak force.
Electrons are the particles responsible for the flow of electricity, and are a major factor in the structure of atoms, molecules, and solids. Electron’s mass is approximately equal to one-thousandth of the mass of a proton, and is the lightest of the known particles.
Momentum of accelerated electron is given by:
p = [tex]\sqrt{2mE}[/tex]
Here, E = 1.0 mv
m = 9.1 × 10⁻³¹ kg
p = [tex]\sqrt{2(9.1 \times 10^{-31})(1.0)}[/tex]
p = 1.3 × 10⁻¹⁵ kg·ms²
de-broglie's equation is
λ = h/p
where,
λ=Wavelength of moving particle.
P=Momentum of moving particle.
h=Planck's constant = 6.63 × 10⁻³ Js
λ = 6.63 × 10⁻³/1.3 × 10⁻¹⁵
λ = 1.24 x 10⁻¹¹ m
Thus, The de Broglie wavelength of an electron accelerated from rest in an electric potential of 1.0 mV is 1.24 x 10⁻¹¹ m.
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how long does it take light to cross the diameter of the milky way galaxy? the diameter of the milky way galaxy is 80,000 light-years.
It would approximately take 200,000 years at Light Speed in order to cross the Milky Way.
What is the Milky way?The Milky way may be defined as a broad band of light that can be frequently observed in the night sky and that is caused by the light of a very large number of faint stars.
It is found that the diameter of the milky way galaxy is 80,000 light-years. So, according to the speed of light, it is calculated that it would approximately take 200,000 years at Light Speed in order to cross the Milky Way. It is a large spiral system consisting of several hundred billion stars, one of which is the Sun.
Therefore, it would approximately take 200,000 years at Light Speed order to cross the Milky Way.
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a certain 48 v electric forklift can lift up to 7000 kg at a maximum rate of 75 meters per minute. what is its power? round your answer to the nearest hundreds.
In this case the power is 703.8 kW and rounding to the nearest hundreds gives 700 kW.
What is power?
Power is the ability to influence or control people, events, and outcomes. It can be seen when one person or group is able to make decisions, set standards, and enforce boundaries. Generally, power is associated with authority, control, and influence; however, it can also refer to the capacity to do work or generate energy.
The power of the forklift can be calculated using the formula: Power = (Load x Velocity) / Time.
In this case, the power is (7000 kg x 75 m/min) / 1 min = 525,000 kg•m/min. Converting to watts, this is 525,000 kg•m/min / 746 = 703.8 kW.
Rounding to the nearest hundreds gives 700 kW.
In this case the power is 703.8 kW and rounding to the nearest hundreds gives 700 kW.
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A microwave oven draws 0.62kW at an electrical energy rate of 6.8 cents per kWh. Using the GRASS method, calculate the cost of using the microwave for 30 minutes every day for 9 days. Show your work. Round your answer to the nearest cent. You may write out your answer on paper and upload the image. [3 pts]
G
R
A
S
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Answer: The cost of using the microwave oven for 30 minutes every day for 9 days is $0.57
Explanation: The GRASS method is used to calculate the cost of using an appliance by multiplying the power rating of the appliance (in kW) by the hours of use, and then multiplying that by the rate per kWh.
Here's the calculation:
Power rating: 0.62 kW
Time of use: 30 minutes/day for 9 days = 30/60*9 = 13.5 hours
Cost per hour = 0.62 * 6.8 / 100 = 0.04236
Total cost = 0.04236 * 13.5 = $0.57
State the basic assumptions of the kinetic theory.
Why does the area around the equator stay about the same temperature year round?
- it receives about the same amount of direct sunlight year round.
- it remains about the same distance from the sun year round.
The sun shines practically directly down on and near the equator every day of the year, maintaining a constant daytime temperature there.
How does temperature work?
The average kinetic potential of the particles inside an object is measured by its temperature. The velocity of these particles likewise increases as the temperature rises. A thermometer or even a calorimeter is used to determine the temperature.
What does temperature in the SI mean?
Kelvin,According to the World System of Units, Kelvin, denoted by the letter K, is the Si derived unit of temperature. In the fields of science and engineering, the Kelvin scale is commonly acknowledged or utilised.
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in which position would you assist a woman to put her feet in the stirrups and to slide forward to position her buttocks near the edge of the table?
How would you help a woman get her feet into the stirrups and go forward till her buttocks were close to the edge of the desk Lithotomy The ideal setting for the
What in physics is position?
In physics, position refers to a thing looks location and is typically represented by an integer on an axes. Learn about vectors, real numbers, position-time networks, and how to plot a stance graph while exploring the definition and applications of position. Current: 11/05/2021 Position: Where are you at this moment? How many different ways can you respond to that?
What is something's initial position?
The origin of something is where it first began. An x-y graph's origin is the intersection of the two
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A projectile is launched at an angle of 15 degrees above the horizontal and lands down range. For the same speed, what other projection angle would produce the same downrange distance
For the same speed, and for the maximum downrange distance the angle would be 45°. If the projectile is launched at an angle of 15° above the horizontal.
If the initial velocity of the launched projectile = u
Horizontal component of the u, = ucosθ
Vertical component of the u, = usinθ
Horizontal downrange, R = ucosθ×T
T = usinθ/g
R = ucosθ × usinθ/g
R = u²sin(2θ)/(2g)
R = 0.25u²/g
For maximum value of the downrange sin(2θ) should be 1, or 2θ = 90°
θ = 45°
So the maximum downrange distance would be = u²sin(90)/(2g)
= u²/(2g)
= 0.5u²/g
It is double the distance of the projectile angle 15°.
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the weight of an object on the moon is one-sixth of its weight on the earth. the ratio of the kinetic energy of a body on the earth moving with speed v to that of the same body moving with speed v on the moon is?
Mass of the body is same on Earth and Moon. `K.E = 1/2 mv^2` . So, both scenarios are the same.
What does angular momentum mean exactly?Kinetic energy is the life force an item gains as a result of motion. To accelerate an object, a power must be supplied to it. To apply a force, we must put more effort. Energy is transferred to the object when the work is complete, which causes it to move at a new, constant pace.
A kinetic example is what?Every moving object or particle contains kinetic energy. A person walking, a baseball flying in the air, foods falling from a table, and charged particles in an electric potential were all utilized as examples of kinetic energy in action.
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A. Consider the time when the ball is at location 2. Which of the above vectors matches the direction of the velocity?B. Consider the time when the ball is at location 2. Which of the above vectors matches the direction of the acceleration?C. Consider the time when the ball is at location 6. Which of the above vectors matches the direction of the velocity?D. Consider the time when the ball is at location 6. Which of the above vectors matches the direction of the acceleration?E. Consider the time when the ball is at location 10. Which of the above vectors matches the direction of the velocity?F. Consider the time when the ball is at location 10. Which of the above vectors matches the direction of the acceleration?
A. Vector B matches the direction of velocity at location 2 (downward)
B. Vector A matches the direction of acceleration at location 2 (upward)
C. Vector B matches the direction of velocity at location 6 (downward)
D. Vector A matches the direction of acceleration at location 6 (upward)
E. Vector A matches the direction of velocity at location 10 (upward)
F. Vector C matches the direction of acceleration at location 10 (zero). At this location, the ball is in freefall, its acceleration is equal to gravity and its velocity is constant, so the acceleration is zero.
you decide to use your garden hose to wash your garage door. the water shoots out at a rate of 10 kg/s and a speed of 16 m/s with respect to the hose. when the water hits the garage, its speed decreases to zero. determine the force that the water exerts on the wall. what assumptions did you make?
The force exerted by the water on the wall will be equal to 160 N. Newton's third law of motion is seen taking place here.
How is force exerted by the water on the wall calculated?The force exerted by the water on the wall is calculated using the impulse-momentum principle. The principle states that the change in momentum of an object is equal to the impulse, or the force applied over a certain period of time. In this case, the change in momentum is equal to the initial momentum of the water (mass flow rate multiplied by velocity) minus the final momentum of the water (mass flow rate multiplied by final velocity) and the time is assumed to be very small.
What assumptions were made in the calculation of force exerted by the water on the wall?The assumptions made in the calculation of force exerted by the water on the wall are:
The water hits the garage instantaneously.
The water flow rate is constant and no water is lost during the impact.
The water hits the garage uniformly over the entire area and not just at one point.
The garage door is not moving before the impact. These assumptions are made to simplify the calculation and to make it more accurate. It is important to note that in real-world scenarios, these assumptions may not always hold true and the force exerted by the water on the wall may be different.
How do you calculate the force exerted by water on the wall?Force exerted by the wall on the water, F = dP/dt
= (P2 - P1)/dt
= dm*(V2 - V1)/dt
= (V2 - V1) x dm/dt
= (0 - 16) x 10
= -160 N (negative sign indicates force opposes the motion)
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alana drew a diagram to compare the life cycles of low-mass and high-mass stars. a venn diagram with 2 intersecting circles. the left circle is labeled low-mass stars and the right circle is labeled high-mass stars. there is an x in the low-mass stars circle, z in high-mass stars circle and y in the intersecting areas. which labels belong in the areas marked x, y, and z?
Low mass stars vary in that they have longer life cycles and develop into white dwarfs. Supernova explosions occur in high mass stars, which also have shorter life cycles.
What should be said about a Venn diagram?Circles are used in a Venn diagram to depict the relationships between individual items or small groups of things. Circles that overlap have certain qualities, but circles that do not overlap do not. Venn diagrams help you to more easily see the relationships and differences between two ideas.
What should be said about a Venn diagram?Circles are used in a Venn diagram to depict the relationships between individual items or small groups of things. Circles that overlap have something in common, but circles that don't share nothing.
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the force of gravity on the average person is about 700 n at the earth's surface. calculate the gravity on a person 10 times that distance from the center of the earth
At the surface of the Earth, the gravitational force acting on a typical individual is roughly 700N. Determine the gravitational pull on a person at a distance 10 times that.
Why does gravity exist?All things having mass, including our Earth, really bend and curve spacetime, which is what causes gravity to pull you toward the ground. What you experience as gravity is that curvature.
What three types of gravity are there?Gravity only comes in one variety. In nature, there is only one form of gravity. According to their masses and the separation across their centers, there is only one kind of gravitational pull which draws the two bodies together. The least powerful central force is gravity.
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Select all that apply: During which 3 periods of time is this object getting faster? This is an all of nothing question so be sure to select exactly 3 of the answers
1) 0s to 2s, 2) 4s to 5s, 3 ) 9s to 10s are 3 periods of time in which this object is getting faster. An identifiable grouping of matter that may be bounded by an identified boundary is referred to as a physical body or physical object.
What does a physical object mean?An object is a discernible grouping of stuff that may move as a unit in three dimensions via translation or rotation and may be contained by a discernible boundary.
What are an object's characteristics?Based on the information perceived, learning and reasoning are used to deduce an object's attributes. Using Occam's razor, an object can be defined as a mental construct that is consistent with the data offered by our senses.
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questionwhich term describes the process by which light passes through an object or a medium?responses reflection reflection refraction refraction transmission transmission absorption
The correct answer is transmission, term describes the process by which light passes through an object or a medium is called transmission.
The experience of light is crucial to human life. Because of the sun's light, we can grow the food we eat, and we can also see because when we view anything, a particular wavelength of light is reflecting off the thing and reaching our eye. Even an object's color is influenced by light. But how does light move, and how does it interact with things once it gets there? What happens to light as it strikes objects around us will be covered in this session.
The tiny particles that make up light are known as photons. Due of their dual behavior as a particle and a wave, photons are incredibly intriguing.
A mirror reflects light when it is shone upon it, much like a bouncing ball or any other particle might. Imagine shining a light through a keyhole so that it illuminates the entire space rather than just a small portion of it, as a laser would. Similarly, if someone shouted through that keyhole, it would be heard across the entire room, not only in that one area. Since sound is also a wave, this is also how light behaves as both a wave and a particle.
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a driver in a car traveling at a speed of 26.8 m/s sees a deer 100 m away on the road. calculate the minimum constant acceleration that is necessary of the car to stop without hitting the deer (assuming the deer does not move). group of answer choices -3.6 m/s2 -1.7 m/s2 -4.2 m/s2 -2.8 m/s2
The minimum constant acceleration that is necessary for the car to stop without hitting the deer is -3.6 m/s^2.
What does the term "constant acceleration" mean?
A change in velocity that does not alter over time is referred to as a constant acceleration. A car's average acceleration stays constant at 20 mph per minute even if it increases its speed by 20 mph in one minute and another 20 mph the next.
Is speed constant at constant acceleration?An item travelling with steady acceleration gains speed over a particular period of time.
By continual acceleration, what do you mean?Constant acceleration indicates the velocity keeps rising continuously, increasing at the same rate of acceleration every second. Additionally, because acceleration is a vector quantity, the direction of motion does not change. A moving object can occasionally alter its velocity by the same amount every second.
Given:
Speed v = 26.8 m/s
Distance d = 100 m
Minimum constant acceleration,
[tex]v^2-u^2=2ad[/tex]
[tex]0-26.8^2=2ad[/tex]
[tex]a=(-718.24/200)[/tex]
[tex]a=(-3.6m/s^2)[/tex]
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an archer shoots an arrow with a mass of 32.4g straight up. the arrow reaches a height of 315m. what is the velocity of the arrow when it hits the ground? ignore air resistance
The third law of motion of Newton explains the relationship between action and reply forces. As an outcome, a reply to the force generated by the bowstring striking the arrow is offered.
What does motion entail?Movement is the act of moving or changing places or positions, as in a conductor. the capacity to move with a living person's force. The word "gait" refers to a person's walking style. a movement or change in posture; a gesture.
What does "motion" mean, and what are some examples?The change in an item's location relative to time is known as motion. Motion includes sounds like windows rattling, a book falling off a seat, water coming from the faucet, etc. even the air that we
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A particle is located at coordinates x = 2.0 m, y = 3.0 m. What is the magnitude of the torque about the origin when the particle is acted upon by a force of magnitude 5.0 N in (a) the positive x direction, (b) the positive y direction, and (c) the negative x direction?
The positive x direction is 0 Nm, positive y direction is 10 Nm, negative x direction is 0 Nm.
What is torque?The torque, also known as the moment of force, is given by the cross product of the position vector (r) and the force vector (F).
The magnitude of the torque is given by the magnitude of the cross product, which is equal to the product of the magnitudes of the vectors (r and F) multiplied by the sine of the angle between them.
In the case of (a) positive x direction, the torque about the origin is given by:
τ = r x F = (2.0 m) x (5.0 N) x sin(90°) = 3.0 m x 5.0 N = 0 Nm.
In the case of (b) positive y direction, the torque about the origin is given by:
τ = r x F = (3.0 m) x (5.0 N) x sin(90°) = 2.0 m x 5.0 N = 10 Nm.
In the case of (c) negative x direction, the torque about the origin is given by:
τ = r x F = (2.0 m) x (-5.0 N) x sin(90°) = 3.0 m x 5.0 N = 0 Nm.
So, the positive x direction is 0 Nm, positive y direction is 10 Nm, negative x direction is 0 Nm.
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A longitudinal wave has a compression to compression distance of 10 m it takes the wave of 5s to pass a point what is the wavelength of the longitudinal wave
The wavelength of the longitudinal wave will be 10meters.
What is wavelength?The wavelength is described as the spatial period of a periodic wave which is the distance over which the wave's shape repeats.
wavelength = v/frequency
frequency = 1/T
frequency = 1/5
velocity= 10/5 = 2m/s
Therefore the wavelength of the longitudinal wave = 2/ 0.2
wavelength = 10meters
The wavelength is the distance between two wave crests, and it will be the same for troughs.
The frequency is the number of vibrations that pass over a given spot in one second, and it is measured in cycles per second Hertz.
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nitrogen . oxygen . reflects radio waves . amount of radiation reflected . amount of solar radiation reaching ground . carbon dioxide . absorbs ultraviolet rays
Nitrogen- 78% of atmosphere; oxygen- 21% of atmosphere; reflects radio waves- ionosphere; amount of radiation reflected- 40%; amount of solar radiation reaching ground- 40%.
What does the total radiation that a surface reflects have a name?Albedo, which is typically given as a percentage or a decimal value, is the amount of solar radiation that a surface reflects, with 1 being the ideal reflector and 0 completely absorbing all incoming light.
Detailed answer of the given question.nitrogen- 78% of atmosphere
oxygen- 21% of atmosphere
reflects radio waves- ionosphere
amount of radiation reflected- 40%
amount of solar radiation reaching ground- 40%
carbon dioxide- needed for photosynthesis
absorbs ultraviolet rays-ozonosphere
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a discus thrower (fig. p4.33, page 104) accelerates a w discus from rest to a speed of 25.0 m/s by whirling it through 1.25 rev. assume the discus moves on the arc of a circle 1.00 m in radius. (a) calculate the final angu- lar speed of the discus. (b) determine the magnitude of the angular acceleration of the discus, assuming it to be constant. (c) calculate the time interval required for the discus to accelerate from rest to 25.0 m/s.
(B) The magnitude of the angular acceleration of the discus is:
α = (ωf - ωi)/t = (7.85 rad/s - 0 rad/s)/1.25 rev = 6.28 rad/s^2 .
What is acceleration ?
Acceleration is the rate at which an object's velocity changes over time. It is measured in meters per second squared (m/s2). Acceleration can be either positive or negative depending on the direction of the change in velocity. Positive acceleration indicates an increase in velocity, while negative acceleration indicates a decrease in velocity.
Acceleration is the result of an applied force, such as gravity, friction, or thrust. It is also affected by the mass of an object, as well as the drag force caused by air resistance. Acceleration can be used to calculate the final velocity of an object after a period of time, as well as the distance traveled in that time. It is an important concept in the study of physics and engineering.
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Capacitor 2 has half the capacitance and twice the potential difference as capacitor 1.
What is the ratio Uc1/Uc2.
Where would I start with this problem and what equation would I use?
You can start the problem by using the formula for capacitance, C = Q/V, where C is the capacitance, Q is the charge stored on the capacitor, and V is the potential difference across the capacitor.
What are capacitors?A capacitor is a passive electrical component that stores electrical energy in an electric field. It consists of two conductive plates, separated by an insulating material called the dielectric. When a voltage is applied across the conductive plates, an electric field is created, which stores energy in the dielectric. The ability of a capacitor to store electrical energy is measured in farads (F).
Given that Capacitor 2 has half the capacitance and twice the potential difference as Capacitor 1, you can express the capacitance and potential difference of Capacitor 2 in terms of those of Capacitor 1.
C₂ = 1/2 × C₁ V₂ = 2 × V₁
You can use these equations to find the ratio of the stored energy in the two capacitors. The stored energy in a capacitor is given by the formula U = 1/2CV², where U is the stored energy, C is the capacitance, and V is the potential difference.
Uc1 = 1/2C₁V₁² Uc2 = 1/2C₂V₂²
By substituting the values of C₂ and V₂ in terms of C₁ and V₁, you can find the ratio of the stored energy in the two capacitors:
Uc1/Uc2 = (1/2C₁V₁²) / (1/2×(1/2C₁) (2V₁) ²) Uc1/Uc2 = 1/8
The ratio of stored energy in the two capacitors is 1/8.
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A mother has four times the mass of her young son. Both are running with the same kinetic energy. What is the ratio of their speeds?Kinetic energyThe kinetic energy K of a body with mass m and speed v isK=12 mv^2
The ratio of the mother's speed to the son's speed is equal to 0.5.
Kinetic energy is defined as K = 1/2 * m * v^2, where m is the mass of the object and v is its velocity. Since both the mother and her son have the same kinetic energy, we can write:
1/2 * m_mother * v_mother^2 = 1/2 * m_son * v_son^2
Since the mother has four times the mass of her son, we can substitute:
m_mother = 4 * m_son
We can substitute this into the equation:
1/2 * 4 * m_son * v_mother^2 = 1/2 * m_son * v_son^2
We can then divide both sides by 1/2 * m_son to get:
4 * v_mother^2 = v_son^2
We can then take the square root of both sides:
v_mother * sqrt(4)= v_son
v_son=0.5
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A boy of mass 60 kg grams up a set of stair of total in 3metre work done in joule(take g 10ms )
A boy of mass 60 kg grams up a set of stair of total in 3 metre work done in joule is 1800 J.
Option B is correct.
Evaluating the problem:Given: Mass of the boy, m = 60 kg
Total height of steps, h = 3 m
Acceleration due to gravity, g = 10 m/s²
➜ Work done = force × displacement
➜ Force = mass × acceleration
Acceleration due to gravity, g is 10 m/s².
∴ Force = mass × acceleration due to gravity
➜ Work done = mass × acceleration due to gravity × displacement
A/C to given problem, boy runs up a set of steps of total height 3 m hence displacement is 3m.
➜ Work done = 60 × 10 × 3
➜ Work done = 600 × 3
➜ Work done = 1800 Joule
What counts as completed work?A force's work is the sum of the object's applied force in the direction of the displacement and the object's displacement. The body moves with some acceleration when we push a block with some force, and the work is finished.
What does it mean to have completed work?An object should be transformed into energy in order to move. The use of force can be used to transfer energy. Work done refers to the amount of energy transferred by force to move an object.
How does one determine the amount of work completed?W=Fs is used to calculate the amount of work done on an object when it is moved x distances by a force F. We add a minus sign if the force is in the opposite direction of the object's movement.
Question incomplete:A boy of mass 60 kg grams up a set of stair of total in 3 metre work done in joule(take g 10ms ).
A. 1500 J
B. 1800 J
C. 2500 J
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what are the two best ways to measure the distance to a distant, isolated spiral galaxy, and how would it be measured
The two best ways to measure the distance to a distant, isolated spiral galaxy are by using the redshift of the galaxy and/or by using the Cepheid variable star method.
What is distance?Distance is a numerical measurement of how far apart two objects, points, or locations are. It is a measure of space in terms of length, width, or height. Distance can be measured in a variety of units including miles, kilometers, yards, and feet. Distance can also be measured in time, such as the amount of time it takes to travel from one location to another. Distance is an important concept in many areas of life, from transportation to navigation to sports.
The redshift of a galaxy is a measure of the expansion of the universe, and is determined by the Doppler Effect. It is calculated using the wavelength of a galaxy's light and the frequency of that light. Redshift can be used to measure the distance of a galaxy by comparing the redshift of the galaxy with the redshift of a standard reference. The further away a galaxy is, the greater its redshift will be.
The Cepheid variable star method is also a reliable way of measuring the distance of a distant spiral galaxy. Cepheid variable stars are stars that pulsate at a regular period, and they can be used as a “standard candle” of sorts, because their luminosity is related to their period. By measuring the period and luminosity of Cepheid variable stars in a distant spiral galaxy, astronomers can calculate the distance to that galaxy.
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