A student performed two experiments and noted her observations below. Based on the information above, which of the following best describes the results of the experiments? Select one: Experiment 1 produced a chemical change; Experiment 2 produced a physical change Both experiments created only physical changes. Experiment 1 produced a physical change; Experiment 2 produced a chemical change Both experiments created a chemical change.
A physical change is one in which there is no new substance formed.
What is a physical change?A physical change is one in which there is no new substance formed. On the other hand, a new substance is formed in a chemical change. The following are cues that can show that a chemical change has taken place;
Change in temperatureEvolution of a gasAppearance of colorAppearance of a solid.In the absence of any of these, the experiment is a physical change. The question is incomplete as the observations were not shown here.
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Why MA Is less than VR?
The mechanical advantage (M.A) of a real
machine is always less than its velocity ratio (V.R.)
because mechanical advantage decreases due to the friction and weight of moving parts of the machine where as the velocity ratio remains constant.
#brainlyeveryday
can someone please answer this, ill give you brainliest and your getting 100 points.
Explanation:
Look at South American and African plates
They are going away from each otherThere is a heavy chance of getting youngest rock
Find the Thrust required to exert a Pressure of 80000 Pascal on an Area of 0.04 m²
Question :-
Find the Thrust required to exert a Pressure of 80000 Pascal on an Area of 0.04 m² .Answer :-
The required Thrust is 3200 N .[tex] \rule {180pt} {2pt} [/tex]
Given :-
Pressure = 80000 PascalArea = 0.04 m²To Find :-
Thrust = ?Solution :-
As per the provided information in the given question, we have been given that the Pressure is 80,000 Pascal . Area is given 0.04 m² . And, we have been asked to calculate the Thrust .
For calculating the Thrust , we will use the Formula :-
Thrust = Pressure × AreaTherefore , by Substituting the given values in the above Formula :-
⇒ Thrust = Pressure × Area
⇒ Thrust = 80000 × 0.04
⇒ Thrust = 3200
Hence :-
Thrust = 3200 N .[tex] \underline {\rule {180pt} {4pt}} [/tex]
Provided that:
Pressure = 80,000 PascalArea = 0.04 m sq.To determine:
ThrustSolution:
Thrust = 3200 NUsing concept:
Pressure formulaUsing formula:
Pressure = Force/ AreaRequired Solution:
»»» Pressure = Force/Area
»»» Pressure = Thrust/Area
»»» 80000 = Thrust/0.04
»»» 80000 x 0.04 = Thrust
3200 N = Thrust[tex]brainlyeveryday[/tex]
Affect bush plane as on motion
Answer:
if the thrust is increased
Light incident on a lake surface is partly reflected and partly refracted. How is the reflected ray different from the incident ray? A. The incident ray is unpolarized whereas the reflected ray is horizontally polarized. B. The incident ray is unpolarized whereas the reflected ray is vertically polarized. C. The incident ray is horizontally polarized whereas the reflected ray is unpolarized. D. The incident ray is vertically polarized whereas the reflected ray is unpolarized. E. The incident ray is vertically polarized whereas the reflected ray is horizontally polarized.
Option B is correct.
(B )The incident ray is unpolarized whereas the reflected ray is vertically polarized.
What is a ray?Ray is the next in a series of characters. Ray is made up of two elements: a line and a line segment. It has one terminating end and one indefinitely extending end.
The ray's length cannot be determined. A ray is seen in the diagram below.
Reason ;
Many light sources, such as the sun, create polarised waves ( randomly). Unpolarized light is made up of a large number of waves with all conceivable polarisation directions.
Hence option B is correct.
(B )The incident ray is unpolarized whereas the reflected ray is vertically polarized.
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HELP me need it asap
Answer:
D, D, A, C, D
Explanation:
A 1000 kg car rides over a hill with a radius of curvature of 30 m. What is the maximum speed that the car can
travel over the hill without launching off the hill (when it's too fast to be in circular motion). Round to a whole
number.
Let's say that the car moves over the hill at 10m/s. What is the value of the normal force at the top of the hill? Answer with 2 sig figs
Answer:
hi-
Explanation:
Since v = R , For the car to lose contact with the road, it must be traveling at a speed of 28 m/s or greater when it reaches the crest of the hill. At lower speeds, the car would remain in contact with the road.
It takes approximately one second for light to travel from the moon to earth suppose there was a large mirror on the moon now a bright light flashes on earth how long will it take for you to see the light reflected by tthe mirror explain how you got your answer
Answer:
You would notice it right away.
Explanation:
When you hear or see something, it is happening right at that moment. It takes you less than a second to realize it.
wave has a Wavelength of .5 meters and a Frequency of 100 Hz.
What is its velocity
v=λf
v=0.5 x 100
v = 50 m/s
Thunder is heard 7.2 seconds after a bolt of lightning is observed. If the speed of sound is 340 m/s, how far away did the lightning strike?
Answer:
2.448km awayExplanation:mark me brainly pls ty.A cube of Iron, 0.0800 m on a side, has a density of 7874 kg/m^3. What is its mass? a (Unit = kg)
The mass of the iron cube of side 0.0800 m, having a density of 7874 kg/m³ is 50.39 kg.
What is mass?Mass can be defined as the quantity of matter a body contains
To calculate the mass of the iron cube, we use the formula below.
Formula:
m = DL³........... Equation 1Where:
m = mass of the iron cubeD = Density of the iron cubeL = Length of each side of the cubeFrom the question,
Given:
D = 7874 kg/m³L = 0.08 mSubstitute these values into equation 1
m = 7874(0.08³)m = 50.39 kgHence, The mass of the iron cube is 50.39 kg.
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Answer:
4.03
Explanation:
correct answer for acellus
Two people push a car for 3 s with a combined net force of 200 N. Calculate the impulse provided to the car.
Question :-
Two people push the car for 3 sec with combined net Force of 200 N. Calculate the Impulse provided to car .Answer :-
Impulse provided to car is 600 Ns .[tex] \rule {180pt} {2pt} [/tex]
Given :-
Time = 3 secForce = 200 NTo Find :-
Impulse = ?Solution :-
As per the provided information in the given question, we have been given that the Time take by the people to push the car is 3 seconds . The Force required is 200 N . And, we have been asked to calculate the Impulse .
For calculating the Impulse , we will use the Formula :-
Impulse = Force × TimeTherefore , by Substituting the given values in the above Formula :-
⇒ Impulse = Force × Time
⇒ Impulse = 200 × 3
⇒ Impulse = 600
Hence :-
Impulse = 600 Ns .[tex] \underline {\rule {180pt} {4pt}} [/tex]
put a lamp in the circuit in such a way as to increase the total current, without affecting the brightness of any of the lamps A and B. PLEASE HELP I HSVE A TEST
Which statement demonstrates that ultraviolet (UV) rays are electromagnetic waves?
A.
They require a medium to travel.
B.
They don’t require a medium to travel.
C.
The particles of the medium through which they travel vibrate perpendicularly to the direction of the wave.
D.
The particles of the medium through which they travel vibrate parallel to the direction of the wave.
E.
The particles in the medium through which they travel remain stationary.
What should scientists do when they see that the data collection or analysis
from their experiment has limitations?
A. Decide not to report any of the experimental results.
ОС
B. Repeat the experiment to see if it still has limitations.
C. Ignore the limitations when they draw conclusions.
D. Describe the limitations in detail in their final report.
Answer:
repeat using same variables
Explanation:
have peer repeat using same variables
Describe, using Bernoulli’s principle, how roofs are lifted off buildings in tornadoes.
During tornadoes
The speed air goes above the roofsSo the air above the roof is gone .So the roof shifts upwards to avoid low air pressureWhich situations describe an elastic collision?
0 Two glass marbles bounce off each other.
O Rodrick flops onto his sofa and sinks into the cushion.
C A tossed water balloon flattens when on lands on the grass.
O
A bowling ball knocks over five pins.
[tex]\qquad\qquad \huge \bf༆ Answer ༄[/tex]
➙ The Correct choice is A
⧠ when two glass marbles bounce off each other, they regain their respective position after collision, since the Loss of energy is minimum, it can be considered as an elastic collision.
Answer:
Explanation:
The question asks "What situations..." and to "Select all the correct answers."
In addition to "two marbles bounce off each other", "a bowling ball knocks over five pins" is another correct answer. The collision between ball and pins is elastic because they are both hard.
I'm not that smart so...yeah
15 points
Answer:C
Explanation:
Inner core, outer core, mantle, crust
Answer:
c
Explanation:
In how many ways can sound be produced
Answer:
1
Explanation:
sound is produced by vibration
A 12.0 kilogram mass weighs 84.0 newtons on a newly discovered planet. What is the magnitude of the acceleration due to gravity on this planet?
A) 1.20 m/s^2
B) 7.0 m/s^2
C) 9.8 m/s^2
D) 84 m/s^2
The weight is the mass times the acceleration due to gravity
[tex]Weight = mass*acceleration-due-to-gravity\\\\84N = 12kg* acceleration-due-to-gravity\\\\acceleration-due-to-gravity = 84N / 12kg\\\\acceleration-due-to-gravity = 7.0 m/s^2[/tex]
Thus the acceleration due to gravity is 7.0m/s^2.
Hope that helped!
Which catastrophic event does NOT have an earthquake as a possible trigger?
hurricane?
tsunami?
landslide?
Answer:
hurricane
Explanation:
A cloud directly above you is about 10° across. From the weather report you know that the cloud is at an altitude of 2200 m. How wide is the cloud?
Answer:
2 π Θ = 360 where Θ is the angle of 1 rad = 57.3 deg
W = R Θ = 2200 m * 10 / 57.3 = 384 m
Note: The difference between radian measure (distance along arc of circle) and the chord of a circle is quite small for 10 deg - probably the cloud is not completely flat anyway
A slinky was measured to carry a longitudinal wave 10 tiles (on the floor) per second. One tile is 30 cm. What is the speed of this wave? In your answer , use millimeters and scientific notation
(10 tiles/sec) · (30 cm/tile) = 300 cm/sec
That's 3000 mm/sec
That's 3 x 10³ mm/sec
I = _____ amp
O 54
O 2.7
O 2.0
O 10
Apply ohms law
R=98V=24
[tex]\\ \rm\Rrightarrow I=\dfrac{V}{R}[/tex]
[tex]\\ \rm\Rrightarrow I=\dfrac{24}{9}[/tex]
[tex]\\ \rm\Rrightarrow I=2.7A[/tex]
how much work was done on a charge of 3.0 to move it through 12v electric potential difference
Answer:
Hence, the work done in moving the charge is 45 J.( Too lazy to translate it to Spanish T_T )Answer:
45 J
Explanation:
Potential difference (V)= 15 V
Charge (Q)= 3C
We know that
The potential difference(p.d) between two point in an electric circuit is defined as the amount of work done in moving a unit charge from one point to the other point.
Potential difference (V) = work done (W)/Charge (Q)
V= W/Q
Putting the values in the above formula we get:
15 V = W / 3 C
W= 15 V × 3 C
W= 45 J
Hence, the work done in moving the charge is 45 J.
Can anyone explain and get the answer pls?
FL₁ =Fl₂
80.x₁ = 30.7
x₁=2.625 m
Question # 1 Multiple Choice A suspect who fakes intellectual disability in order to explain his innocence in a murder _____. is insane is insane is psychotic is psychotic is malingering is malingering has a mental illness
Given what we know we can confirm that a suspect who fakes intellectual disability in order to explain his innocence in a murder is malingering.
What is malingering?This is the action of pretending to be ill in some way in order to avoid a certain responsibility. In this case, the suspect is malingering in order to avoid the consequences of their actions.
Therefore, we can confirm that a suspect who fakes intellectual disability in order to explain his innocence in a murder is malingering.
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Do you ever feel so depressed that you cant even cry anymore?
How long does it take light to reach us from the sun, 1. 50 ×108km away?.
Answer:
8 minutes
Explanation:
It take 8 minutes for light to reach us from the sun.