The Kilogram was for many years the only one of the seven SI base standards that was not defined in terms of a fundamental attribute of nature.
It was specified as the weight of a platinum-iridium cylinder stored in a lab outside of Paris under inert conditions.
The problem with that is that it needs to be managed in order to use such a standard for calibrating exact copies. No matter how meticulously you do it, surface molecules must experience some minimal impact.
Therefore, efforts have continued to find a replacement standard that is not a tangible thing. With the suggestion for a new Standard Kilogram utilizing a gadget called the Kibble Balance, it now seems that the quest is over.
Answer:
one standard kilogram is the mass of cylinder made up of platinum-iridum alloy with equal diameter and base kept Ar international bureau of weight and measures near paris
What is the formula of gravity?
Answer:
F=Gm1m2 / r2
Explanation:
F = force
G = gravitational constant
m_1 = mass of object 1
m_2 = mass of object 2
r = distance between centres of the masses
answer is in the attachment
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The wheel of a bicycle with a radius of 0.85 m is traveling at a speed of 5.0 m/s. Calculate its angular speed.
Group of answer choices
A) 4.3 rad/s
B. 5.9 rad/s
C. 9.2 rad/s
D. 1.7 rad/s
Answer:
B
Explanation:
Angular speed=velocity/radius
5/0.85=5.9
The flywheel in the shape of a solid cylinder of mass 75.0 kg and diameter 1.40 m rotates about an axis passing through the center of mass. a. what constant torque is required to bring it up to an angular speed of 320 rev/min in 8.00 s, starting from rest?
The torque required for the cylinder is 76.99 N m.
What is torque?
Torque may be defined as the product of the force and the distance perpendicular to the force from the axis of rotation.
Calculation of the angular acceleration:
The first kinematic equation for the rotational motion is,
ω=ω₀+αt
where ω₀ is the initial angular velocity, ω is the final angular velocity, α is the angular acceleration and t is the time. Since the cylinder starts from the rest, its initial angular velocity is zero.
Here, ω=320 rev/min or ω=320*2π/60 rad/sec, ω₀=0 and t=8.00 sec. Put these values in the above equation and solve it to get the value of angular acceleration.
320*2π/60=0+α*8
α=320*2π/(8*60)
α=4.19 rad/s^2
Calculation of the torque:
The torque T is given by the formula,
T=Iα
where I is the moment of inertia.
For the cylinder, I=1/2*mr^2
where m is the mass of the cylinder and r is the radius of the cylinder.
So,
T=1/2*mr^2*α
Here m=75 kg, radius r is half of the diameter r=1.4/2=0.7 m, and α=4.19 rad/s^2. Using these values in the formula of torque.
T=1/2*(75)*(0.7)^2*4.19
T= 76.99 N m
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What temperature increase is necessary to increase the power radiated from an object by a factor of 8
The temperature increase that is necessary to increase the power radiated from an object by a factor of 8 is to increase the temperature by a factor of 1.68.
What is radiation?
Radiation is the emission of energy in the form of waves or particles through space.
The magnitude of radiation emitted by an object is given as;
E = kσT⁴
where;
k is Boltzmann constantσ is the emissivity of the objectT is temperatureE₁/T₁⁴ = E₂/T₂⁴
T₂⁴ = T₁⁴E₂/E₁
T₂⁴ = T₁⁴(8E₁) / E₁
T₂⁴ = T₁⁴8
T₂ = (T₁⁴8)^(¹/₄)
T₂ = 1.68T₁
Thus, the temperature increase that is necessary to increase the power radiated from an object by a factor of 8 is to increase the temperature by a factor of 1.68.
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In terms of net charge, how does an electrically polarized object differ from an electrically charged object?.
Answer:
An electrically polarized object can carry no net charge
Example: charge Q at +x and charge -Q at -x for no net charge
An electrically charged object has a net charge on the object
Based on what you have learned about the cultural influence on moral decisions, explain how your culture influences your moral choices. Consider what we learned in Unit 1 about the many layers of cultural identity. What cultural layers have played a part in constructing your sense of right and wrong?
Our culture greatly influences our moral decisions because the culture give us the way of living.
How your culture influences your moral choices?
Moral judgments and behaviors are dependent on the culture. We learn our behaviour and way of living from the culture that is present in our surrounding environment.
Sub-layer cultural is the layer that have played a part in constructing your sense of right and wrong because we grown up in this layer of culture.
So we can conclude that Our culture greatly influences our moral decisions because the culture give us the way of living.
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A 66.0 kg diver is 3.10 m above the water, falling at speed of 6.10 m/s. Calculate her kinetic energy as she hits the water. (Neglect air friction)
Kinetic energy as she hits the water is 3300 joule.
To find the answer, we need to know about the Newton's equation of motion.
What's the Newton's equation of motion to determine the final velocity?The final velocity is determined asV²=U²+2aS
V= final velocity, U= initial velocity, a= acceleration and S= distanceWhat's the final velocity of the driver falling from 3.10m with initial velocity of 6.10m/s?Here, a= 9.8m/s², U= 6.10m/s and S= 3.10mSo, V²= 6.1²+2×9.8×3.10= 98 V= √98= 10m/sWhat's the kinetic energy of the driver when touches the water?Kinetic energy= 1/2×mass×velocity²
= 1/2 × 66 × 10²
= 3300J
Thus, we can conclude that the kinetic energy of the driver is 3300 Joule.
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A 40.0 N cart slides from rest down a rough 6.0 m long ramp inclined at 30.00 with the horizontal. Find the velocity of the cart at the bottom of the ramp if the force of friction between the cart and ramp is 6.0 N. Group of answer choices 8.7 m/s 3.3 m/s 4.5 m/s 6.4 m/s
The velocity of the cart at the bottom of the ramp is 6.42m/s
Given that 40N cart slides from rest down a rough 6.0 m long ramp and the degree given is 30 and the friction force given is 6.0N
We need to find the velocity of the cart at the bottom of the ramp
One of two types of energy is known as potential energy and is the latent energy present in an item at rest.
According to the rule of conservation of energy, energy can only be transformed from one form of energy to another and cannot be generated or destroyed.
Potential energy of the crate at the top =40N×6sin30°m=120J
Energy lost due to friction =6N×6m=36J
Let the speed of the crate at the bottom be v.
Applying the law of conservation of energy,
120−36=0.5×(40/g)×v2
Therefore,
v=6.42m/s
Hence the velocity of cart at the bottom of the ramp is 6.42m/s
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The box survived the fall and is returned to the top of the building. More objects are put into the box, and the box with its contents now has a total mass of 93 kg. The box is dropped, and it reaches a higher terminal speed than before. After reaching terminal speed, what is the magnitude of the air resistance force acting upward on the falling box? (The fact that the heavier object reaches a higher terminal speed shows that the air resistance force increases with increasing speed.)
911.4N is the air resistance force acting upward on the falling box.
The constant or the highest speed that an object reaches when it falls through a liquid or gas is referred to as terminal velocity.
At terminal velocity,
The Upward force acting on an object(F) = Weight of the falling object(W).
Due to the fact that the two forces are acting in opposing directions, there is no net force acting on the item, and that's why the speed of the object becomes constant.
The Formula used to calculate the Upward force
F = mg...….. Equation(1)
where,
m = total mass of the box
g = acceleration due to gravity = 9.8 [tex]m/s^{2}[/tex]
F = Air resistance force acting upward on the box
Given:
The box with its contents now has total mass of 93Kg
m = 93 kg
g = 9.8 m/s²
Substitute the values into equation (1)
F = 93×(9.8)
F = 911.4 N
Hence, the magnitude of the air resistance force acting upward on the falling box is 911.4N
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when an object rolls down a ramp with sliding. Does its motion translational motion or rotational motion ?
Explanation:
torque is just a force that acts off-center and causes an object to spin. Practically every quantity in translational motion has a rotational equivalent. Instead of linear acceleration, we have rotational (or angular) acceleration. Instead of forces, we have torques.
.
What type of research method would best answer the question “How many rivers in Florida have nitrate pollution in them?”
A. relational study
B. cause and effect study
C. field study
Answer:
B causes and effects
Explanation:
because florida have nitrate pollution
Which of the statements given below is correct? Give reason
to support your statement.
i. In winter the winds flow from the land to the ocean.
ii. In summer the winds flow from the land towards the
ocean
If the hoist tower is not enclosed, the hoist platform or car must be totally enclosed on all sides for the full height between the floor and:
If the hoist tower isn't enclosed, the hoist platform must be totally enclosed on all sides for the full height between the floor and the overhead protective covering.
What is a hoist tower?A hoist tower can be defined as temporary elevator shaft made of scaffolding that is constructed and used to provide pathways for hoisting materials during a building-construction work.
According to the Occupational Safety and Health Administration (OSHA), the hoist platform must be totally enclosed on all sides for the full height between the floor and the overhead protective covering when the hoist tower isn't enclosed.
In conclusion, the hoist platform must be totally enclosed on all sides in order to prevent a potential injury to construction workers or an accident during a building-construction work.
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The speed that a tsunami can travel is modeled by the equation , where s is the speed in kilometers per hour and d is the average depth of the water in kilometers. What is the approximate depth of water for a tsunami traveling at 200 kilometers per hour?.
0.32 km
How to reach the answer:
The formula below provides the tsunami's speed in response to the query.
s = 356√d
when the tsunami's speed is 200 km/h, the equation's "s" is changed to "200," and the equation of speed is then expressed as follows.
200 = 356√d
The equation can be changed to compute the depth of the water as,
√d = 200÷356
√d = 0.562
Now on squaring both sides:
(√d)² = (0.562)²
d = (0.562)² = 0.316 or 0.32
Therefore the approximate depth of water for a tsunami travelling at 200km/h is 0.32 km
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A stone is thrown upwards into the air. Describe what is the magnitude and direction of its acceleration.
Answer:
Every object on the surface of the earth is pulled towards its surface because of a force known as the gravitational force. It is a force of attraction that exists between any two objects with mass.
The gravitational force of the earth pulls every object towards the surface of the earth. Because of this, an object free in the air is accelerated. The acceleration caused by the gravitational force is known as the acceleration due to gravity.
The magnitude of the acceleration is constant in a downward direction.
What is acceleration?Acceleration is the rate of change in velocity.
price at which speed adjustments with time, in phrases of each pace and direction. A factor or an object shifting in a direct line is extended if it hastens or slows down.Earth's acceleration is always in the downward direction.so when an object is thrown upward its acceleration is directed downward.if the object is downward then also the acceleration is downward.Learn more about acceleration here:-https://brainly.com/question/460763
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A motorcycle moving at 50 km/h skids 10 m with locked brakes. How far will it skid with locked brakes when traveling at 150 km/h
Answer:
It will cover a distance of 90.155 m.
Explanation:
For the first case, using the kinematic equation 3,
v^2-u^2=2as
Here v=0, u=50 km/h which is 13.88 m/s and x=10 m. so
0-(13.88)^2=2*a*10
a=9.63 m/s^2
For the second case, u=150 km/h which is 41.67 m/s.
If the acceleration is same for this case, then using the same kinematic equation.
0-(41.67)^2=2*9.63*s
s=90.155 m
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Now put the two equations together. Substitute your result in equation A for the (vaverage) term in equation B. Your final equation should only have d, a, and t terms.
An average velocity can be defined as the total distance covered by a physical object divided by the total time taken.
Mathematically, you can find average velocity (Vaverage) from acceleration (a) and time (t) by using this formula:
Average velocity = acceleration × time
Vaverage = at .......equation A.
Also, you can find distance (d) from average velocity (Vaverage) and time (t) by using this formula:
Distance = average velocity × time
d = vt .......equation B.
Now, putting the two equations together and substituting the Vaverage term in equation B:
d = (at) × t
d = at²
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Complete Question:
A. How do you find average velocity (Vaverage) from acceleration (a) and time (t)?
B. How do you find distance (d) from average velocity (Vaverage) and time (t)?
C. Now put the two equations together. Substitute your result in equation A for the (Vaverage) term in equation B. Your final equation should only have d, a, and t terms.
9. What could cause scientist to change their mind?
New technology allows for new understandings of old ideas
b. The findings are not popular with the public.
C.
The findings are not widely accepted as true.
d. No one has been able to prove they are right.
why does the temperature remain constant at the boiling point of water when the internal energy is increasing?
The temperature remain constant at the boiling point of water when the internal energy is increasing because: all the heat energy provided is used up in changing the state of water from liquid to gaseous water vapour.
Meaning of Change in StateA Change in state can be defined as the process of moving from one matter form to another due to heat supplied or removed.
A change in state can happen in different forms of matter.
In conclusion, The temperature remain constant at the boiling point of water when the internal energy is increasing because: all the heat energy provided is used up in changing the state of water from liquid to gaseous water vapour.
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A wave traveling in a string has a wavelength of 35 cm, an amplitude of 8. 4 cm, and a period of 1. 2 s. What is the speed of this wave?.
0.29 m/s is the speed of this wave.
How to find the wave speed of a wave?Given: The wavelength of the wave traveling (∧) =35 cm
The time period of the wave (t) = 1.2 sec.
The frequency of the wave= 0.833 Hz
We need to find the wave speed of a wave.
Formula of wave Speed = Wavelength x Frequency= 35 x 0.833
= 29.167 cm/sec
= 0.29 m/sec
Therefore, the speed of the wave is 0.29 m/s.
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A point charge with charge q1 = 2.40 μC
is held stationary at the origin. A second point charge with charge q2
= -4.90 μC moves from the point (0.170 m, 0) to the point (0.230 m , 0.270 m ).
How much work is done by the electrostatic force on the moving point charge?
Express your answer in joules.
The work done by the electrostatic force on the moving point charge is 1.014 J.
Displacement of the second charge
d = √[(0.23 - 0.17)² + (0.27 - 0)²] = 0.277 m
Force between the two chargesF = kq₁q₂/r²
where;
q₁ is magnitude of first chargeq₂ is magnitude of second charger is the distance between the two chargesk is Coulomb's constantF = (9 x 10⁹ x 2.4 x 10⁻⁶ x 4.9 x 10⁻⁶)/(0.17)²
F = 3.66 N
Work done in moving the point chargeW = Fd
W = 3.66 x 0.277
W = 1.014 J
Thus, the work done by the electrostatic force on the moving point charge is 1.014 J.
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On a calm day with no wind, you can run a 1500-m race at a velocity of 4.0 m/s. If you run the same race on a day when you have a constant headwind that slows your speed by 2.0 m/s, how much time would it take you to finish the race
Answer:
The required time is 750 s.
Explanation:
The velocity of the man gets slowed by 2.0 m/s when the wind is blowing.
Therefore the speed of the man on the day of wind is (4.0-2.0)=2.0 m/s.
The time, speed and distance are related by the equation,
t=v/d
Given v= 2 m/s and d=1500 m.
The required time is,
t=1500/2
t=750 s
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Can God make a rock that He can't carry?
Answer:
The answer to the question lies in the character of God. God is either finite or infinite. If God is finite and limited, then God could make a rock He could not lift. If God is unlimited in power, then He could create a rock of any size and weight and still be able to lift it.
Explanation:
A girl exerted 150 Newtons to lift a barbell 2.0 m in 4.0 s. If she did the same thing in 8.0 s, the work done on the barbell by the girl would be
There is an electric field near the Earth's surface whose magnitude is about 130 V/m . How much energy is stored per cubic meter in this field
The electric energy stored per unit cubic meter is 7.5×10^(-8) joule/m³.
To find the answer, we need to know about the electric energy density.
What's the mathematical expression of electric energy density?In a vacuum where the permittivity is 8.85× 10^(-12), the electric energy density is 1/2 ×ε₀ ×E²
What's the energy density for electric field of 130 V/m?Energy density= (1/2)× 8.854×10^(-12)×130²
= 7.5×10^(-8) joule/m³
Thus, we can conclude that the energy density is 7.5×10^(-8) joule/m³.
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If the net force acting on a stationary object is zero, then the object will A. remain at rest. B. accelerate in the direction of the strongest force. C. decelerate at a steady rate of speed. D. begin moving backwards.
The object will remain at rest
Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Here net force is zero
An object with a net force of zero acting on it will remain at rest, if initially at rest, or it will maintain a constant velocity.
F=MA
Force F=0
Than Acceleration A=0
With zero Acceleration stationary object will remain at rest.
Hence Remain at rest is the correct answer
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A 5.9 kg box slides a 9.3 m distance on ice. If the coefficient of kinetic friction is 0.206, what is the work done by the friction force
Work done by the friction force is 110.77 J
Calculation of friction force:
here box has mass, m=5.9 kg
It slides the distance of, d=9.3 m
coefficient of kinetic friction is 0.206
Now we can say that,
net force on the object is applied force and friction force
The net force according to Newton's second law:
F(net)=m*a
F(applied) - f(friction) = m*a
The work done by friction force will be
W= -k*mg*d
here g is gravitational acceleration.
substituting the values we get,
W=-(0.206)*(5.3)(9.8)*(9.3)
W= -110.77 J
negative sign denotes the opposite direction.
work done by the friction force is 110.77 J
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A bowling ball rolls down a lane and hits a bowling pin. Which statement below is true about the forces exerted during the impact?
Group of answer choices
a. The force that they exert on each other has the same magnitude.
b. The bowling pin exerts a larger force on the ball than the ball does on the pin.
c. One of the two forces is larger, but which is larger cannot be determined unless more information is provided.
d. The bowling ball exerts a larger force on the pin than the pin does on the ball.
The statement that is true about the forces exerted during the impact is that force that they exert on each other has the same magnitude (option A).
What is Newton's third law of motion?Newton's third law of motion states that to every action (force applied) there is an equal but opposite reaction (equal force applied in the opposite direction).
This law suggests that when a bowling ball rolls down a lane and hits a bowling pin. The bowling pin applies an equal force but in an opposite direction.
Therefore, the statement that is true about the forces exerted during the impact is that force that they exert on each other has the same magnitude.
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You jump off a truck and accelerate toward the surface of the Earth. Does the Earth accelerate toward you?
When we jump from the truck and accelerate towards the earth surface, the earth also accelerates towards us but it's acceleration is very negligible.
To find the answer, we need to know about the acceleration of earth due to the gravitational attraction.
What's the gravitational force between the earth and a person?Gravitational attraction force is GMm/r² between the earth and a person. M= mass of the earthm= mass of the person
r= separation between them.
What's the acceleration of the earth towards the person when he jumps from a truck?According to Newton's second law, Force = M×accelerationAcceleration= Force / MHere, Force = GMm/r²,so acceleration of earth= Gm/r²
As this acceleration is very small, so we can't notice it.Thus, we can conclude that the earth also accelerates towards us.
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Betelgeuse is a supergiant star that will eventually supernova, which means that by mass it is classified as
Betelgeuse is a supergiant star that by mass is classified as a high-mass star.
What is a celestial body:
Celestial bodies are natural objects that are a part of the massive universe. Even though the universe has vast expanses of empty space, it is inhibited by them. The following are the 7 categories in which the celestial bodies are classified in:
Thus, as Betelgeuse is a supergiant star that will eventually result in a supernova it is classified as a high-mass star.
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