green liquid becoming a red liquid
Among the given options, the chemical change is option c, green liquid becoming red liquid by the some reactions. All other changes are physical changes.
What are chemical changes ?Chemical changes are those which involves the breaking or making of chemical bonds and the formation of a new product that have properties different from the initial substances.
Physical changes does not involve any change in chemical bonding. They include change in size, shape, conducting, solubility all phase changes etc are physical changes.
The change in color of a solution is due to the formation of a new product with different color indicating the occurrence of a chemical reaction. Freezing, boiling, all are physical changes. Hence, option c is correct.
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PLEASE HELP!!Chemical reactions can be recognized by the presence of heat, light, or gas formation. The ultimate outcome for any chemical reaction is the
A. change from a solid to a liquid.
B. presence of sound.
C. formation of a new chemical substance.
Answer:
C
Explanation:
because it's new chemical substances
What is the electric current measured in
An ampere (AM-pir), or amp
A 10 Newton effort force is required to lift a 10 kg box just off the ground. What is the effort required to lift the box off the ground using a 3m long lever? [The fulcrum is placed 0. 5m from the box. ].
Answer:
2.0 N is the answer
Explanation:
Hope this helps ;D
What kind of electromagnetic waves are used by an FM radio?.
Answer:
electromagnetic radiation
what is the best matral or mechaniazime to use in a egg drop form 30 feet
Answer:
Ok so there are many ways to go at this.
you can get a zip lock bag and put a bunch of plastic around the egg inside the bag. (image down below)
Just anything to slow down the descent speed.
Cushion the egg so that something other than the egg itself absorbs the impact of landing.
Explanation:
How much impulse is required to change the velocity of a 2500 kg truck by 15 m/s?
Answer:
A car weighing 2500 kg and travelling at 15 m/s stops at a distance of 25 m deceleration uniformly. What is the force exerted on it by the brakes?
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5 Answers
Naren Nagarajan
, Cambridge Examinations Officer at Kasiga School, Dehradun (2008-present)
Answered 3 years ago · Author has 1.1K answers and 1.9M answer views
(a) W= Fd ( energy = force x distance )
(b) KE = .5 m v*v ( Kinetic energy of the car )
KE =0.5 * 2500 * 225KE =281250 Joules
Using (a) , Reducing kinetic energy to zero over 25 m
281250 = F * 25
F = 281250 /25
F = 11250 N
To check or use a different method …..
v^2 = u^2 +2as ( Third equation of motion )
2as = v^2 -u^2 ( v = 0 and U = 15 )
as = -225/2
a = - 225/2 * 25
a= - 225/50
a= - 4.5 m sec ^ -2
F = ma
F = 2500 * - 4.5
F = - 11250 N ( the negative sign indicates that the force is opposite in direction to the motion of the car )
The answer is correct since both values for F are equal.
a bomb sitting at rest on a table explodes into four pieces of equal mass. the first piece travels to the south at a velocity of 55.0 m/s. the second piece travels to the west at a velocity of 80.0 m/s. the third piece travels at a velocity of 40.0 m/s [30.0 w of n]. what is the velocity of the fourth piece?
The velocity of the fourth piece after the explosion is 118.5 m/s at 14.7⁰ east of north.
Conservation of linear momentumThe principle of conservation of linear momentum states that the sum of the initial momentum is equal to sum of final momentum.
Initial momentum of the bomb before explosion is equal to the final momentum of pieces of bomb after explosion.
Pi = Pf
0 = P₁ + P₂ + P₃ + P₄
0 = mv₁ + mv₂ + mv₃ + mv₄
0 = v₁ + v₂ + v₃ + v₄
Resolve the velocity into x and y componentsConsider x-y plane for the velocity of the piece of bomb;
Let southward = negative directionLet northward = positive directionLet eastward = positive directionLet westward = negative direction[tex]0 = (v_1x + v_1y) + (v_2x + v_2_y) + (v_3x + v_3_y) + (v_4_x + v_4_y)\\\\0 = (0 - 50y) + (-80x + 0) + (-40cos30x + 40sin30y) + (v_4_x + v_4_y)\\\\0 = -50y -80x - 34.64x + 20y + v_4_x + v_4_y\\\\0 = -30y - 114.64x + v_4_x + v_4_y \\\\v_4_x + v_4_y = 114.64x + 30y\\\\|v_4| = \sqrt{114.64^2 + 30^2} \\\\|v_4| = 118.5 \ m/s\\\\tan(\theta ) = \frac{30}{114.64} \\\\tan(\theta) = 0.262\\\\\theta = tan^{-1} (0.262)\\\\\theta= 14.7 \ ^0[/tex]
Thus, the velocity of the fourth piece is 118.5 m/s at 14.7⁰ east of north.
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What is the relationship between resistance and current.
Answer:
They are inversely proportional with each other. [tex]R[/tex] ∝ [tex]\frac{1}{I}[/tex]
Explanation:
By the equation V=IR, assume V is constant.
Since I and R are on the same side,
if I increase, R decreases, or the vice versa.
if an object moves from a position of x = 12 m to x = 124 m, then back to x = 98 m. If the time it takes to complete this motion is 10 s, what is the average velocity of the object?
Answer:
13.8m/s
Explanation:
Speed = Distance/Time
Since the object moved 138m over 10s we just substitute it in.
Speed = 138/10s
Speed = 13.8m/s on Average
Need help on this question asap pleasee
Answer:
My aunt died and I am felling down today
The bonds of the products store 22kJ more energy than the bonds of the reactants. How is energy conserved during this reaction?
A. The reaction uses up 22kJ of energy when bonds break.
B. The reaction creates 22kJ of energy when bonds form.
C. The reaction system absorbs 22kJ of energy from the surroundings.
D. The surroundings absorb 22kJ of energy from the reaction system.
whoever gives a detailed explanation will get branliest
Pls answer this ,today is last day of classes then I got finals soon lol
Answer and Explanation:
The law of conversation of energy states that energy cannot be created or destroyed. The pendulum slows down and stops eventually not because the kinetic energy is destroyed, but it is transferred into sound and heat energy instead because there is air resistance and friction.
Kinetic energy => Gravitational potential energy (Loop but some energy transferring to heat and sound each time)
what are ohmic resistors?
An ohmic resistor is a resistor that obeys Ohm's law V = IR (voltage = current x resistance). Therefore, if the voltage in such element is increased by n number of times, by the same number n has to increase the current.
[tex] \\ [/tex]
hope it helps:)
Ohmic resistors are materials that obeys ohms law.
What is ohmic resistor?An ohmic resistor is a material that obey's ohms law. This material does not allow passage of electricity through it.
V = IR
where;
I is the current in the conductorR is the resistanceV is the voltageThus, ohmic resistors are materials that obeys ohms law.
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Help!!
I need correct answer:)
Answer:
4 independent of l and area of cross section
Option D
It's independent of.lemgth or area of cross section of the wire.As
Breaking stree depends upon the material of the wire .A 2. 7-cm-diameter parallel-plate capacitor has a 1. 8 mm spacing. The electric field strength inside the capacitor is 1. 2×105 v/m.
How do seatbelts relate to the first law of motion.
Answer: Seatbelts relate to Newton's first law of motion because in the case of a car accident, someone in the car would continue forward until they hit somethng else. A seat belt will help prevent this because it will push back on you (action-reaction force).
Explanation:
A building under construction requires building materials to be raised to theupper floors by cranes or elevators. An amount of cement is lifted 76.2 m by acrane, which exerts a force on the cement that is slightly larger than the weightof the cement. If the network done on the cement is 1.31 × 103 J, what is themagnitude of the net force exerted on the cement?
Answer:
17.19NExplanation:
Work = 1.31 × 10³ = 1310
F = W/D = 1310/76.2
≈ 17.19N
An amount of cement is lifted 76.2 m by arcane, which exerts a force on the cement that is slightly larger than the weight of the cement. If the network done on the cement is 1.31 × 103 J, 17.19N is the magnitude of the net force exerted on the cement.
What is force?In mechanics, force is defined as any action that seeks to sustain or modify the movement of a body or even to deform it. The idea of force is frequently defined in terms of Isaac Newton's three laws of motion, which are laid forward by book Principia Mathematica (1687).
Newton's first principle is that a body at rest and moving uniformly inside a single direction will continue in that condition unless another force is exerted to it.
Work = 1.31 × 10³ = 1310J
Force = Work/Distance
= 1310/76.2
≈ 17.19N
Therefore, 17.19N is the magnitude of the net force exerted on the cement.
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How does temperature affect the speed with which the solute dissolves?
Answer:
molecules at higher teperature have higher speed & energy.
Explanation:
the higher they are the more it effects
What intermolecular force is the closest representation to the interaction between the balloon and the water?
The intermolecular force is the closest representation to the interaction between the balloon and the water is Dipole-Dipole interaction.
What is intermolecular force?
The intermolecular force is the force of attraction between atoms, molecules, and ions when they are placed close to each other.
This force denotes the miscibility of polar solvents and their interacting characteristics like melting points and boiling points.
Thus, the intermolecular force is the closest representation to the interaction between the balloon and the water is Dipole-Dipole interaction.
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If a balloon is heated, what happens to the pressure of the air inside the balloon if the volume remains constant?.
Answer:
P V = N R T is the ideal gas equation
P2 / P1 = T2 / T1
The pressure will increase.
A book weighs 16 n and placed on a shelf that is 2. 5 m from the ground. What is the gravitational potential energy of the book
Answer: 40J
Explanation:
Gravitational potential energy is defined as the mass of the object, multiplied by the acceleration due to gravity, and the height from your arbitrary reference point. If we assume that the floor has a gravitational potential of zero, then the gravitational potential of the book on the shelf would be:
[tex]U=mgh[/tex]
We were given the weight of the book, not the mass. In order to find the mass of the book, we need to divide the weight by the acceleration of gravity. We have that:
[tex]Mass=Weight/Gravity[/tex]
[tex]Mass=16N/9.8m/s^2[/tex]
[tex]Mass=1.63kg[/tex]
Plug everything into the gravitational potential formula to get:
[tex]U=(1.63kg)*(9.8m/s^2)*(2.5m)[/tex]
[tex]U=40J[/tex]
The gravitational potential energy of the book placed 2.5 m above from the ground is 40 joules.
What is potential energy?The energy of the body due to its position with reference to some other body is called the potential energy of the two - body system.
Given is an object whose weight is 16 N placed on a shelf that is 2.5 m from the ground.
The weight of the book is -
W = mg = 16 N
The gravitational potential energy of the book will be -
E = mgh = 16 x 2.5 = 40 joules
Therefore, the gravitational potential energy of the book placed 2.5 m above from the ground is 40 joules.
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Which transformation will map figure L onto figure L'? (1 point) Two congruent triangles Figure L and Figure L prime are drawn on a coordinate grid. Figure L has vertices at negative 4, 2, neg
a Horizontal translation of 8 units
b Horizontal translation of 6 units
c Reflection across x-axis
d Reflection across y-axis
Answer:
Horizontal translation of six units
Explanation:
What would a wave with a low amplitude sound like?.
If you could hear it at all, it would sound very soft.
When you stand on the merry-go-round in question 12, you hold a string from which
is suspended a rubber stopper of mass 45 g. You are 2.9 m from the centre of the
merry-go-round. You take 4.1 s to complete one revolution. What angle does the string make with the vertical?
The angle the string makes with the vertical is : 34.6°
Given data :
mass of rubber stopper ( m ) = 45 g
Radius ( r ) = 2.9 m
Time to complete one revolution ( T ) = 4.1 secs
Calculate the angle the string makes with the verticalapplying the formula below
Tan ∅ = [tex]\frac{mw^2r}{mg}[/tex] --- ( 1 )
cancel out m from equation ( 1 )
Tan ∅ = [tex]\frac{w^2r}{g}[/tex] ----- ( 2 )
where ; w = [tex]\frac{2\pi }{T}[/tex]
Therefore equation ( 2 ) becomes
Tan ∅ = [tex]\frac{4\pi ^2r}{T^2g}[/tex] --- ( 3 )
where ; r = 2.9 m, T = 4.1 secs , g = 9.8
Insert values into equation ( 3 )
Tan ∅ = 0.69
∅ = Tan ( 0.69 )
= 34.6°
Hence we can conclude that The angle the string makes with the vertical is : 34.6°.
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If a box is pulled with a force of 100 N at an angle of 25
degrees, then what are the X and Y components of the force?
The X and Y components of the force are 90.63 Newton and 42.26 Newton respectively.
Given the following data:
Force = 100 Newton.Angle of inclination = 25°To determine the X and Y components of the force:
The horizontal component (X) of a force:Mathematically, the horizontal component of a force is given by this formula:
[tex]F_x = Fcos \theta\\\\F_x =100 \times cos25\\\\F_x =100 \times 0.9063[/tex]
Fx = 90.63 Newton.
The vertical component (Y) of tensional force:Mathematically, the vertical component of a force is given by this formula:
[tex]F_y = Fsin \theta\\\\F_y =100 \times sin25\\\\F_y =100 \times 0.4226[/tex]
Fy = 42.26 Newton.
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The source of a sound moves away from the listener. The listener has the impression that the source is __________.
Explanation:
As the source of sound waves approaches you the sound waves get closer together, increasing their frequency and the pitch of the sound. The opposite happens when the source of sound waves moves away from you
1.A student is pushing a 30 kg
desk across a floor at a
constant speed of 1 m/s. How
much work, tothe nearest whole joule, mustthe student do on the desk to change the speed to 6 m/s?
2. A 5 kg stone falls from the
top of a cliff and strikes the
ground at a speed of 88.5 m/s.
What is
the height of the cliff?
Answer:
A student is pushing a = 35 kg desk across a floor at a constant speed of 1 = 4 m/s. How
much work, to the nearest whole joule, must the student do on the desk to change the speed to
2 = 6 m/s?
Solution:
Work done = change of energy
=
2
2
2
−
1
2
2
=
35 × 36
2
−
35 × 16
2
= 630 − 280 = 350 J
Answer = 350 J
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What is the force of repulsion between two points positive charges 5 and 8 separated at a distance of 0.02m apart
Explanation:
F =(frac{1}{4{pi}{varepsilon}_o}) x (frac {q_1q_2}{r^2})
F =(frac {5 {times} 10 {times} 8 {times} 10}{0.002 {times} 0.002}) x 9 x 10
F = 900N
Would a larger balloon float better or worse than a smaller balloon?
(We are doing a project on making a hot air balloon out of tissue paper).
Answer:
The bigger balloon will have a larger area and would experience a greater buoyant force exerted on it which would make it even lighter than a smaller balloon and will have higher payload capacity than a smaller one.
A 6.0 kg metal ball moving at 4.0 m/s hits a 6.0 kg ball of putty at rest and sticks to it. The two go on at 2.0 m/s.
(a) What is the kinetic energy of the metal ball before it hits?
(b) What is the kinetic energy of the metal ball after it hits?
(c) What is the kinetic energy of the putty ball after being hit?
(d) How much energy does the metal ball lose in the collision?
(e) How much kinetic energy does the putty ball gain in the collision?
(f) What happened to the rest of the energy?
The metal ball lost energy while the putty ball gained energy.
What is momentum?Momentum is the product of mass and velocity of the body. We must note that momentum before collision is equal to momentum after collision.
1) Kinetic energy before collision = 1/2mv^2 = 0.5 * 6 * 4 = 12 J
2) kinetic energy after collision = 0.5 * 6 * 2= 6 J
3) Kinetic energy of putty ball = 0.5 * 6 * 2= 6 J
4) Energy lost by the metal ball = 12 J - 6 J = 6 J
5) Energy gained by the putty ball = 6 J - 0J = 6 J
6) The rest of the energy was converted to heat after the collision.
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