Answer:
The Principle of Moments states that when a body is balanced, the total clockwise moment about a point equals the total anticlockwise moment about the same point. Moment =force F x perpendicular distance from the pivot d.
21
The law of universal gravitation can be expressed as
where F is the force of attraction, G is the universal graviational constant (6.674x10-11
N m2 kg-2) m1 is the mass of the first object, m2 is the mass of the second object, and r is th
distance between the centers of the two objects.
A 1.2-kilogram container of sugar sits 2.3 meters away from a 9.4-kilogram bag of flour. Wha
is the gravitational force of attraction between the sugar and the flour?
(4 Points)
mim2
F=G
72
The attractive force between sugar and flour by using Newton's law of gravitation is 14.229 × 10⁻¹¹ N.
What is the Universal law of Gravitation?This law states that every object in the universe attracts each other. The attractive force is directly proportional to the masses of two objects and inversely proportional to the square of the distance between them.
This law is applicable to all the objects with mass in the universe and hence it is called the Universal law of gravitation. It was proposed by Newton.
The attractive force, F =G (m₁×m₂ / r²). m₁,m₂ is the masses of two objects and r is the distance between two masses. G is the gravitational constant and is equal to 6.67×10⁻¹¹Nm²kg⁻².
From the given,
Gravitational constant,G = 6.67×10⁻¹¹Nm²kg⁻²
m₁ (mass of sugar) = 1.2 kg
m₂ (mass of flour) = 9.4 kg
r (distance of separation) = 2.3 m
The attractive force, F = G (m₁×m₂ / r²)
F = 6.67×10⁻¹¹×(1.2×9,4) / (2.3)²
= 14.229 × 10⁻¹¹ N
Thus, the attractive force F = 14.23 × 10⁻¹¹ N.
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9. If the magnitude of two vectors and their resultant are the same, what is the angle between the two vectors?
The angle between the two vectors of the same magnitude would be 120 degrees to have the resultants the same.
answer: 120 degrees
Which part of the electromagnetic spectrum can humans see?.
Answer:
The visible light spectrum
Explanation:
The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view.
Is the mass of an alpha particle greater than, less than, or equal to the mass of an electron?.
The mass of an alpha particle greater than the mass of an electron. Hence option A is correct.
What is alpha particle ?The alpha particle is a positively charged particle that is similar to the nucleus of the helium-4 atom and is spontaneously released by some radioactive substances. It is made up of two protons and two neutrons bonded together and has a mass of four units and a positive charge of two. Ernest Rutherford discovered and named alpha particles (1899), which he and colleagues employed in studies to examine the structure of atoms in thin metallic foils. This investigation produced in the original notion of the atom (1909-11) as a miniature planetary system with negatively charged particles (electrons) circling a positively charged nucleus. Later, in the first artificially created nuclear transmutation (1925), Patrick Blackett blasted nitrogen with alpha particles, converting it to oxygen.
Alpha particle is heavier than the electron cause alpha particle has 2 neutron and two protons which makes it heavier.
Hence option A is correct.
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Which describes the movement of a fluid during convection?
Warm and cool fluids rise.
Warm and cool fluids sink.
Warm fluid rises and cool fluid sinks.
Warm fluid sinks and cool fluid rises.
Answer:
warm rises cold sinks
Explanation:
What is a car’s acceleration if it increases its speed from 5 m/s to 20 m/s in 3 s?
10 m/s 2
15 m/s 2
5 m/s 2
–15 m/s 2
Answer:
5
Explanation:
vf = vi + at
20 = 5 + 3a
3a = 15
a = 5
A body moving with an acceleration 2 m/s?then what is the change in velocity in 4sec.
Answer:
As Per Provided Information
Moving body has 2m/s² acceleration
Time taken by body is 4 second
We are asked to find the 'change in velocity' ( ∆V) by the body.
Formula Used here
[tex] \boxed{\bf{\Delta \: V \: = acceleration \: \times time \:}}[/tex]
Substituting the given value
[tex] \sf\longrightarrow\Delta\:V \: = 2 \times 4 \\ \\ \\ \sf\longrightarrow\Delta\:V \: =8m {s}^{ - 1} [/tex]
Therefore,
Change in velocity is 8 m/sA ray of light hits a mirror at 27 degrees from the normal. What is the angle between the reflected ray and the normal?
Transfer payments are used to redistribute money to various segments of society. please select the best answer from the choices provided t f
Answer:
True
Explanation:
You pay back what you owe for what youve purchased
Answer: True
Explanation:
A 10 ohms, a 7 ohms and a 14 ohms resistor are connected in series with a 24 V battery. Calculate the equivalent resistance. Answer in units of ohms.
Answer:
31ohms
Explanation:
in a series u add all the ohms together
At the top of the arc of a pendulum the value of the _____ is zero. kinetic energy potential energy acceleration All of the above
At the top of the arc in a swinging pendulum the value of the kinetic energy is zero.
What is Kinetic energy?This is defined as the energy possessed by a body virtue of its motion or movement.
When a pendulum swings, it possesses kinetic energy which is usually zero at the top of the arc after which it possesses potential energy as a result of the resting position.
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A dart sketch and describe a potential energy diagram that represents the striking and burning of the match. Remember and label the diagram with the energy changes that occur. Parentheses you may do the sketch by hand or using a drawing program. Parentheses your answer must include potential energy diagram and a written description. Parentheses note you do not have to use actual energy values
Answer:
I love ur pfp! Ok here's a rough image of how a typical energy diagram works. You give a little energy (A) and you get the potential that was in there all along. Kinda like pushing a big rock off a cliff. You do a little work then get a lot of energy out as the PE turns into other forms. In a match it's heat and light
Is this correct?
Explanation:
Which sentence correctly uses a comma to separate coordinate adjectives?
Answer:
..
Explanation:
Coordinate adjectives are adjectives that describe the same noun equally. They should be separated with commas. In this sentence, both red and round are describing the ball. The correct answer is, "The red, round ball is Adley's favorite toy to play with."
what is the density of an object with mass of 60 g and a volume of 2cm3
Answer:
D=mass /volume
=60/0.002
=30000
Throughout the reflection, make sure you have a copy of the student guide and your data tables. use the drop-down menus to complete the statements. the independent variable in part i, the one that is intentionally manipulated, is the . the independent variable in part ii, the one that is intentionally manipulated, is the . the independent variable in part iii, the one that is intentionally manipulated, is the . the independent variable in part iv, the one that is intentionally manipulated, is the .
The value of the dependent variable is based upon changes in the values of the independent variable.
What is dependent and independent variable?The term independent variable has to do with the variable that is being intentionally manipulated in an experiment. The dependent variable is the variable that changes in value as the independent variable is manipulated.
Now, the question is unclear however, we do know that in an experiment, the value of the dependent variable is based upon changes in the values of the independent variable.
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Answer:
The independent variable in Part I, the one that is intentionally manipulated, is the
✔ type of material
.
The independent variable in Part II, the one that is intentionally manipulated, is the
✔ charge of an object
.
The independent variable in Part III, the one that is intentionally manipulated, is the
✔ movement of a magnet
.
The independent variable in Part IV, the one that is intentionally manipulated, is the
✔ presence of an electric field
.
Explanation:
A 2000 kg car has a 40000 J of kinetic energy. How fast is it moving?
Answer:
6.32 m/s
Explanation:
KE = 1/2 m v^2
sqrt (2 * KE /m) = v = 6.32 m/s
Jessica is riding on a merry-go-round on an outer horse that sits at a distance
of 8.0 m from the center of the ride. Jessica's sister, Julie, is on an inner horse
located 6.0 m from the ride's center. The merry-go-round turns around once
every 40.0 s. a) Explain which girl is moving with the greater linear speed.
b) What is the centripetal acceleration of Julie and her horse?
a. Jessica's has a greater linear speed.
b. The centripetal acceleration of Julie and her horse is 0.148 m/s².
a) Explain which girl is moving with the greater linear speed.Jessica's has a greater linear speed.
To answer the question, we need to know what Linear speed is.
What is linear speed?This is the tangential speed at which an object in circular motion moves. It is given by v = rω where
r = distance of object from center of circle and ω = angular speed.Now, given that Jessica is riding on a merry-go-round on an outer horse that sits at a distance of 8.0 m from the center of the ride and Jessica's sister, Julie, is on an inner horse located 6.0 m from the ride's center. Also, the merry-go-round is moving at constant angular speed.
Since Linear speed v = rω and ω = constant,
So, v ∝ r.
So, the girl with the greater distance from the center of the merry-go-round would have the greater linear speed.
Since
Jessica is at r' = 8.0 m and Julie is at r" = 6.0 m.Since
v ∝ r, and r' = 8.0 m > r" = 6.0 m,So, Jessica's has a greater linear speed.
b) What is the centripetal acceleration of Julie and her horse?The centripetal acceleration of Julie and her horse is 0.148 m/s².
Centripetal acceleration a = rω² where
r = distance of Julie from center of merry-go-round = 6.0 m and ω = angular speed of merry go round.Since the merry-go-round turns once every 40.0 s, we have that ω = 2π/40.0 s
= π/20.0 s
= 0.157 rad/s
Since a = rω²
Substituting the values of the variables into the equation, we have
a = rω²
a = 6.0 m × (0.157 rad/s)²
a = 6.0 m × 0.0247 rad²/s²
a = 0.148 m/s²
So, the centripetal acceleration of Julie and her horse is 0.148 m/s².
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the mass of an object is 90 kg calculate weight of the same object on the surface of the moon.(acceleration due to gravity on the Moon surface is 1/6 of the value of acceleration due to the Gravity on Earth) also calculate the weight of the same object on earth surface.
Explanation:
the weight of an object is its force exerted by gravity.
on earth we take gravitational acceleration to be 9.8 m/s^2
so the weight of an object on earth is given by F = mg
hence,
F = 90 × 9.8
F = 882 Newtons (weight on earth)
gravitational acceleration on the moon is equal to 9.8/6. so, we can just use the same formula to find the weight on the moon.
F = 90 × 9.8/6
F = 147 Newtons (weight on the moon)
make sure to ask if you need any further guidance.
A measurement of the hotness or coldness of an object can be defined by its... A. potential energy. B. magnetism. C. chemical potential. D. temperature.
Answer:D
Explanation: temperature is the measure of hotness and coldness of a body.
An astronaut is planning a trip to a newly-discovered planet. According to 2 points
the Law of Universal Gravitation, the astronaut's weight on the new planet
will be greater than his weight on Earth if:
-the new planet has less gravity than Earth.
-the new planet has the same gravity as Earth.
-the new planet has more gravity than Earth.
-the gravity of the planet doesn't matter.
-Weight is the same everywhere in the
universe.
Answer:
The new planet has more gravity
Explanation:
gravity force = G m1 m2 / r^2
decresing r or increasing the planet mass will increase the force
The first step in responding to any sports injury is to __________.
A.
remove the danger that lead to the injury
B.
ensure that the player's air way is not obstructed
C.
begin chest compressions for CPR
D.
ask the player to stop playing the sport
Please select the best answer from the choices provided.
A
B
C
D
Answer:
remove the danger that lead to injury
Explanation:
The best way is
spot the reason for injuryThen try best to remove that cause as fast as possible.Then spot the place of body where injury happenedNOW treat for thatAnswer:
A
Explanation:
The first step in responding to an injury in sports is to remove the danger that led to the injuryB cannot be correct because if an athlete suffers a broken leg you don't check their air ways primarilyC is also not right as that is only when the player is unconsciousD is not right as that is the result of only a very life-threatening injuryA is the right answerWhy will a struck tuning fork sound louder when it is held against a table?.
Answer:
1.)the surface of the table is set into vibration
2.)the initial vibration was larger
3.)The entire table vibrates
Explanation:hope this helps :3 have a good day xlXCherryColaXlx..(pls mark me brainliest)
When driving on roads that may be slippery: A. Always drive at the maximum speed limit. B. Use cruise control to maintain a steady speed. C. Reduce your following distance. D. Do not make any sudden changes in speed or direction.
When driving on roads that may be slippery, do not make any sudden changes in speed or direction. Option D is correct.
What is a slippery surface?The slick road sign serves as a warning. When the road is wet or ice, drivers should use extra caution and reduce their speed. When the weather is bad, avoid making any rapid changes in direction.
When driving on roads that may be slippery, do not make any sudden changes in speed or direction. It may cause accident because the vehicle can lose their balance.
Hence, option D is correct.
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Andrea, whose mass is 48kg, thinks she's sitting at rest in her 5. 0m-long dorm room as she does her physics homework. Within what range is her velocity likely to be?
For Andrea, whose mass is 48kg, thinks she's sitting at rest in her 5. 0m-long, her range is mathematically given as
dv=1.95*10^{-37}ms^{-1}
Within what range is her velocity likely to be?Generally, the equation for the uncertainty principle is mathematically given as
mdxsv=h/2
Therefore
dv=h/(2mdx)
dv=1.054*10^{-39}/2*45*6
dv=1.95*10^{-37}ms^{-1}
In conclusion, range of her velocity
dv=1.95*10^{-37}ms^{-1}
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You are generating traveling waves on a stretched string by wiggling one end. If you suddenly begin to wiggle more rapidly without appreciably affecting the tension, you will cause the waves to move down the string.
Answer:
At the same speed as before
Explanation:
Speed is dependent on the tension in the string, and since the tension isn't changing, the speed of the waves will also not change.
Which phase of the moon occurs after a waxing gibbous?.
What is the speed of a wave that has a frequency of 250Hz and a Wavelength of 1.5 m?
Question :-
What is the Speed of a Wave that has a Frequency of 250 Hertz and a Wavelength of 1.5 meter ?Answer :-
Speed of the Wave is 350 m/s .Explanation :-
As per the provided information in the given question, we have been given that the Frequency of the Sound Wave is 250 Hertz. Its Wavelenght is given as 1.5 Meter. And, we have been asked to calculate the Speed of the Wave.
For calculating the Speed , we will use the Formula :-
[tex] \bigstar \: \: \boxed {\sf { \: Speed \: = \: Frequency \: \times \: Wavelenght \: }} [/tex]
Therefore , by Substituting the given values in the above Formula :-
[tex] \Longrightarrow \: \: \sf { \: Speed \: = \: Frequency \: \times \: Wavelenght }[/tex]
[tex] \Longrightarrow \: \: \sf { \: Speed \: = \: 250 \: \times \: 1.5 }[/tex]
[tex] \Longrightarrow \: \: \bf { \: Speed \: = \: 375 }[/tex]
Hence :-
Speed of the Wave = 375 m/s .[tex] \underline {\rule {180pt}{4pt}} [/tex]
Speed = Frequency Wavelenght
Speed
Speed
Hence :
Speed of the Wave = 375 m/s.
=
250 x 1.5
375
What is the kinetic energy of a 38g soccer ball that is traveling at a speed of 80. m/s? Convert
Answer:
1.52 JExplanation:
Kinetic energy formula
K.E. = 1/2mv²Given
m = 38 g = 0.038 kg [kg is standard unit]v = 80 m/sSolving
K.E. = 1/2 x 0.038 x 80K.E. = 40 x 0.038K.E. = 1.52 Jm=0.038kg
v=80m/s
Kinetic energy
1/2mv²1/2(0.038)(80)²6400(0.038)/23200(0.038)121.6JQ.01 When charging a secondary cell, energy is stored within a dielectric material using an electric field. True or False
True, when charging a secondary cell, energy can be stored within a dielectric material using an electric field.
Relationship between dielectric material and electric field
The electric field in a capacitor separates the negative and positive charges in the dielectric material, this causes an attractive force between each plate and the dielectric.
The dielectric material can store electric energy due to its polarization in the presence of external electric field, which causes the positive charge to store on one electrode and negative charge on the other.
Thus, when charging a secondary cell, energy can be stored within a dielectric material using an electric field.
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In the rocket, what is the equal and opposite reaction?
Answer:
see below
Explanation:
Gases flying out at high velocity out the back
rocket flying forward