Answer: Experimental design means creating a set of procedures to test a hypothesis. A good experimental design requires a strong understanding of the system you are studying. By first considering the variables and how they are related ( Step 1 ), you can make predictions that are specific and testable
Explanation:
A hypothesis (plural hypotheses) is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it. Scientists generally base scientific hypotheses on previous observations that cannot satisfactorily be explained with the available scientific theories. Even though the words "hypothesis" and "theory" are often used interchangeably, a scientific hypothesis is not the same as a scientific theory. A working hypothesis is a provisionally accepted hypothesis proposed for further research, in a process beginning with an educated guess or thought.
Destructive interference in a standing wave produces points with zero amplitude called nodes *
true or false
Answer
True; Destructive occurs for two interfering waves that are 180 degrees out of phase
Alan made the diagram below to represent ultraviolet rays, radio waves, gamma rays, and infrared rays based on their properties.
Four waves labeled A, B, C, and D are shown. Wave A has the greatest gap between its consecutive peaks and Wave B has the least gap between its consecutive peaks. Wave C has the second greatest gap between consecutive peaks, followed by Wave D.
Which wave best represents gamma rays?
Wave A
Wave B
Wave C
Wave D
Answer:
b
Explanation:
Answer:
Wave B
Explanation:
The answer is Wave B because gamma rays have the least gap between their wavelengths. If you look up "electromagnetic spectrum" you will see that gamma rays have the least gap between them. I hope this helps (:
what is angle of declination
Answer:
Definition of angle of declination
1 : the angle made by a descending line or plane with a horizontal plane. 2 : the angle between the direction indicated by a magnetic needle and the true meridian. — called also magnetic declination.
Explanation:
HOPE I HELPEDCORRECT ME IF I AM WRONG PLEASE
dentical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is
A solar eclipse occurs when the Moon moves directly between the Earth and the Sun. When Venus moves directly between the Earth and the Sun, we do not see an eclipse for several reasons including ________________.
Answer:
it's because the eclipse hides the moon and Venus and the sun
Explanation:
I found it
Now build the complete circuit. Connect a wire to each end of the pair of batteries. Then add the lightbulb and the switch, using additional wires as needed. To disconnect two parts, click where they’re joined, and then click Split Junction. You can also click Reset All to start over. You’ll be successful when you can close the switch (click, hold, and drag it) and the lightbulb glows. Use the drawing tool to sketch the parts of your successful circuit
Answer: <3
Explanation:
HOPE THIS HELPS
Calculate the voltage difference in a circuit that has a resistance of 24 Ohms if the current is 0.50A. Use the formula I= V/R.
Answer:
12V
Explanation:
from the formula, I=V/R
V=IR
V=24x0.50
Voltage difference in a circuit = 12V
Wonder Woman uses 2,000 N to lift a truck 2.3 meters in 5 seconds. How much power did she use?
Answer:
she used alot
Explanation:
she would need to be very powerful if she coukd do that.. but then again its wonder woman.
(srry just so detail )
but
f=2,000
x=2.3
w=?
2,000x 2.3 =869.57
w=869.57
t=5 s
p=?
p=w/t
869.57/5=173.913
so she used 173.913 w also known as power
What is the difference between mass and weight?
Answer:
We often use the world's 'mass'and 'weight' interchangeable,but they mean quite different things.Your mass is the same no matter where you go in the universe;your weight,on the other hand,changes from place to place.
Explanation:
hope it helps
What is the role of greenhouse gases, movement of
energy around earth?
Explanation:
With the natural greenhouse effect, the energy budget is balanced as thermal radiation is re-radiated towards the ground, trapping thermal energy and warming the Earth.Energy from the sun heats Earth's surface, warms the atmosphere, provides energy for photosynthesis, causes evaporation, drives the weather and water cycles, and powers the ocean currents.Which of the following are likely to be affected by a magnet?
Check all that apply.
A. Credit card
B. A CD
C. An audio cassette tape
D. A wind up alarm clock
Answer:
B and D
Explanation:
Both a CD and alarm clock have magnetic properties of metal alloys and polymers.
The system is in equilibrium, and the pulleys are weightless and frictionless.
Find the tension T.
The acceleration of gravity is 32 ft/s^2
Note: lb ≡ slug · ft/s^2
Answer in units of lb.
There is an attachment of the system below
Answer:
F = M a where F is in lbs, M in slugs and a in ft/s^2
Apparently this system is motionless so
T + 15 is the downward force on the mass of 15 lbs
1 slug * 32 ft/s^2 is 32 lbs the weight of the other block
It takes a force of 32 / 2 = 16 lbs on the cable to support this weight
16 lbs = T + 15 lbs
T = 1 lbs
A sphere of 0.047 kg aluminum is placed for sufficient time in a vessel containing boiling water, so that the sphere is at 100°C. It is then immediately transferred to a0.14 kg copper calorimeter containing 0.25 kg water at 20°C. The temperature of water rises and attains a steady state at 23°C. Find specific heat capacity of aluminum.
We know that,
Heat lost by the sphere = Heat gained by H₂O & Calorimeter
=> m₁ x c₁ x ∆T₁ = m₂ x c₂ x ∆T₂ + c₃ x m₃ x ∆T₂
=> 0.047 kg x c₁ x 77°C = 0.25 kg x 4.18 x 3°C+0.14 x 0.386 x 3°C
=> c₁ = ( 0.25 kg x 4.18 kg^-1 k^-1 x 3°C + 0.14kg x 0.386 kg^-1 k^-1 x 3°C ) / 0.047 kg x 77°C
=> c₁ = 3.30/ 0.047 x 77
=> c₁ = 0.913 KJ kg^-1 k^-1
Hence , the specific heat capacity of aluminum would be 0.913 KJ kg^-1 k^-1
Refer to energy and refer to water molecules, describe what is happening when ice is at -10 °C is warming up to ice at 0°C?
Answer: in ice 0 Celsius in the melting point, in water 0 Celsius is the freezing point. so when ice is warming up, at 0 Celsius Particles in ice gain enough energy to break the forces of attractions keeping the as solid, at 0Celsius ice starts to melt.
Explanation:
define simple machine with any two examples
(Hand-held) Pencil sharpener, and an Axe.
A simple machine is a (to its name) simple machine, used to complete a task that is uncomplicated. Such as the first example, a pencil sharpener. It has a small razor, and you turn a pencil inside to shave off unnecessary wood.
- - - - - - - - - - - - - - - - - - - - - -
My second example is a wedge. A hatchet (or axe) is a wedge, it pushes between two sides and increases force, therefore, breaking it apart.
- - - - - - - - - - - - - - - - - - - - - -
Good luck! :)
~pinetree
How can a particle that has zero mass (travels at the speed of light) carry energy, and excite cells in our eyeballs?
Answer:
Quantum theory states that electromagnetic radiation travels in discrete amounts with energy
h ν = E = h c / f
Kinetic energy lab report (soda bottle and bean bag) Does anyone have the data part filled out?
Answer:I added my whole lab report into here let me know if this the what you need
Explanation:
What is the angular momentum of a 0.25 kg mass rotating on the end of a piece of
rope in a circle of radius 0.75m at an angular speed of 12.5 rad/s?
L = r x p = rmv = mr²ω
L = 0.25 x 0.75² x 12.5 = 1.758
Angular momentum of a 0.25 kg mass rotating on the end of a piece of rope in a circle of radius 0.75 m at an angular speed of 12.5 rad/s is 1.758.
What is momentum?The meaning of MOMENTUM is a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity. Momentum is a vector quantity.
Angular momentum is momentum in angular motion,
L = r x p = rmv = mr²ω
L = 0.25 x 0.75² x 12.5 = 1.758
Angular momentum of a 0.25 kg mass rotating on the end of a piece of rope in a circle of radius 0.75m at an angular speed of 12.5 rad/s is 1.758.
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Ruth knows she has a 25% chance of having a child with blue eyes and a 75% chance of having a child with brown eyes
Part A
Ruth considers making a spinner to simulate the probability of having three children with blue eyes. Describe what the spinner should look like and the steps she should take to perform the
simulation
Respond in the space provided
Part B
Ruth used a spinner to perform 10 trials to simulate the probability of having three children with blue eyes She observed 1 outcome of having three children with blue eyes.
• Is Ruth's estimated probability representative of the theoretical probability of having three children with blue eyes? Explain why or why not.
• Provide the estimated probability from Ruth's simulation and the theoretical probability of having three children with blue eyes
Respond in the space provided
Answer: There is two event that needs to be made: 1. blue eyes, and 2. brown eyes. A spinner is made with a circle. A full circle has 360 degrees and it would be divided based on the probability of the event.
Blue eyes have 25% chance, so the angle of the spinner would be 25%*360°= 90°
Brown eyes have 75% chance, so the angle of the spinner would be 25%*360°= 270°
So, the 90° of the circle would be written as 1(blue eyes) and 270° of the circle will be written as 2(brown eyes).
Explanation: u welcome
Answer: I have no clue
Explanation: I don’t know
Select the correct answer. Which feature of a wave determines its color in the visible spectrum? A. Amplitude B. Composition C. Temperature D. Wavelength.
Answer:
D. Wavelength
Explanation:
Explanation: the colour of visible light depends on the wavelength of the wave. The visible light spectrum goes approximately from wavelength of 380 nm (corresponding to violet light) to 750 nm (corresponding to red light), and the different colours in between correspond to different wavelengths.
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26. A 0. 5 kg arrow was shot at a target. The arrow accelerated at 200 m/s2. What was the net
force on the arrow to the nearest newton?
Answer:
100 newtons
Explanation:
force = mass x accelleration
∑F = m.a
∑F = net force
∑F = 0.5 x 200 = 100 N
A particle with charge q, mass m, and initial speed v0 in the x direction enters a region where the electric field is uniform in the x direction. How much time does it take for the particle to cross the region of length d
Answer:
S = 1/2 Vo t + 1/2 a t^2 = d time for particle to travel distance d
F = E q force acting on particle
a = F / m = E q / m
d = Vo t + E q / (2 m) t^2
One would need to solve the quadratic equation shown to find the time t
t^2 + (2 m) / E q * V0 t - (2 m) / E q * d = 0
or t^2 + A V0 t - A d = 0 where A = (2 m) / E q
A 12. 0 cm object is 9. 0 cm from a convex mirror that has a focal length of -4. 5 cm. What is the distance of the image from the mirror? –3 cm –4 cm 3 cm 4 cm.
A mirror equation is an equation that relates object distance and image distance to focal length. The distance of the image from the mirror will be -3 cm.
What is a mirror equation?A mirror equation is an equation that relates object distance and image distance to focal length. It's sometimes referred to as a mirror formula.
[tex]\rm \frac{1}{v} +\frac{1}{u} =\frac{1}{f} \\\\[/tex]
The given data in the problem is;
f is the focal length = -4. 5 cm
u is the object distance=12. 0 cm
v is the image distance =?
[tex]\rm \frac{1}{v} +\frac{1}{12.} =\frac{1}{-4.5} \\\\ \rm \frac{1}{v}= \frac{1}{-3} \\\\ \rm v= -3cm[/tex]
Hence the distance of the image from the mirror will be -3 cm.
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A pendulum is released from a high position Because of friction, the pendulum eventually stops swinging Which of the following actions occur as the pendulum stops swinging?
a) Kinetic energy increases
b) Potential energy decreases
c) Kinetic energy remains the same
d) Potential energy remains the same
Answer:
b) Potential energy decreases
Explanation:
The reason why Potential energy decreases here is because you know that if you bounce a ball without applying any force to it, then it falls, and then comes back up, but does it come all the way up to where it was fallen from? NO! So that's why, each time the ball bounces, the potential energy goes down.
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Why are you able to observe the Doppler Effect with sound waves on Earth but not light waves?
write the type of energy present in pond water and kerosene ?
Answer:
Potential and Kinetic energy
Explanation:
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The table shows the mechanical energy and velocity of a rock that was thrown four times. The rock has a mass of 2. 4 kg. A 3 column table with 4 rows. The first column is labeled trial with entries 1, 2, 3, 4, 5. The second column is labeled mechanical energy in joules with entries 32, 34, 35, 31. The last column is labeled velocity in meters per second with entries 7. 0, 2. 0, 6. 0, 3. 0. During which trial was the rock the highest above the ground? 1 2 3 4.
The energy to the position is known as potential energy. The maximum potential energy is in case 2. Hence the maximum height will be in case 2.
What is kinetic energy?The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.
According to the law of conservation of energy, the total energy is defined as the sum of kinetic energy and potential energy.
Mechanical energy = kinetic energy+potential energy
Potential Energy = Mechanical Energy - Kinetic Energy
As a result, if an object has greater potential energy, it will have a higher height.
The formula for the kinetic energy is given by;
The potential energy for the different cases will be;
Case-1;
[tex]\rm KE_1=\frac{1}{2}mv^2 \\\\ \rm KE_1=\frac{1}{2}\times2.4(7)^2 \\\\ \rm KE_1=58.8 J[/tex]
[tex]\rm PE_1 = 32 - 58.8 = -26.8 J[/tex]
Case-2;
[tex]\rm KE_2=\frac{1}{2}mv^2 \\\\ \rm KE_2=\frac{1}{2}\times2.4(2)^2 \\\\ \rm KE_2=4.8 J[/tex]
[tex]\rm PE_2 = 34 - 4.8 = 29.2 J[/tex]
Case-3;
[tex]\rm KE_3=\frac{1}{2}mv^2 \\\\ \rm KE_3=\frac{1}{2}\times2.4(6)^2 \\\\ \rm KE_2=43.2 J[/tex]
[tex]\rm PE = 35 - 43.2 = -8.2 J[/tex]
Case-4;
[tex]\rm KE_3=\frac{1}{2}mv^2 \\\\ \rm KE_3=\frac{1}{2}\times2.4(3)^2 \\\\ \rm KE_2=10.8 J[/tex]
[tex]\rm PE_2 = 31 - 10.8 = 20.2 J[/tex]
The maximum potential energy is in case 2. Hence the maximum height will be in case 2.
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Answer:
B:
the SECOND trial
Explanation:
The moon remains in orbit around earth because of the force of —.
The moon remains in orbit around earth because of gravitational energy
Data;
MoonGravityGravitational EnergyMoon and other centripetal bodies maintain a state of constant orbit or centripetal acceleration because of gravitational energy.
The gravitational energy acting on the moon keeps the body rotating. This is further elaborated by Einstein's theory of relativity.
Learn more on gravitational energy here;
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The Earth has ________ for the past 2 million years.
A. gradually warmed slowly
B. frozen then quickly thawed
C. gradually cooled
D. stayed the same temperature
E. cycled between hot and cold
The Earth has cooled for the past 2 million years.
A car is moving with a lot of momentum. If it were moving at the same speed but had five times as much mass, its momentum would be
Answer:
5 times as much
Explanation:
the equation for momentum is p=mv
p(momentum)=m(mass)xv(velocity)
So if the velocity is the same, but the mass is multiplied by 5 the total momentum would be 5 times greater than the previous scenario.