observations and collect data
Make Predictions
Gather Data
Analyze the Data
Draw Conclusions
the scientific method include: 1) asking a question about something you observe, 2) doing background research to learn what is already known about the topic, 3) constructing a hypothesis, 4) experimenting to test the hypothesis, 5) analyzing the data from the experiment and drawing conclusions,
The figure shows an overhead view of a 2.10 kg plastic rod of length 1.20 m on a table. One end of the rod is attached to the table, and the rod is free to pivot about this point without friction. A disk of mass 55.0 g slides toward the opposite end of the rod with an initial velocity of 26.5 m/s. The disk strikes the rod and sticks to it. After the collision, the rod rotates about the pivot point.
(a)What is the angular velocity, in rad/s, of the two after the collision?
(b)What is the kinetic energy, in joules, before and after the collision?
KEi
=
J
KEf
=
J
(a) The angular velocity of the system after the collision is 1.61 rad/s.
(b) The kinetic energy before collision is 19.31 J and the kinetic energy after collision is 1.45 J.
Conservation of angular momentumThe angular velocity of the system is determined by applying the principle of conservation of angular momentum.
Li = Lf
P x r = Ifωf
mv x r = Ifωf
[tex]\omega _f = \frac{mvr}{I_f} \\\\\omega _f = \frac{mvr}{\frac{1}{3}Mr^2 + mr^2 } \\\\\omega _f = \frac{mvr}{r^2(\frac{1}{3}M + m )}\\\\\omega _f = \frac{mv}{r(\frac{1}{3}M + m )}\\\\\omega _f = \frac{0.055 \times 26.5}{1.2(\frac{2.1}{3} \+ \ 0.055)} \\\\\omega_f = 1.61 \ rad/s[/tex]
Kinetic energy before the collisionKinetic energy before the collision is calculated as follows;
[tex]K.E_i = K.E_{ball} + K.E _{rod}\\\\K.E_i = K.E_{ball} + 0\\\\K.E_i = \frac{1}{2} \times m \times v^2\\\\K.E_i = \frac{1}{2} \times 0.055 \times 26.5^2\\\\K.E_i = 19.31 \ J[/tex]
Kinetic energy after the collisionThe kinetic energy after the collision is calculated as follows;
[tex]K.E_f =\frac{1}{2} I_f \omega_ f^2\\\\K.E_f = \frac{1}{2} (\frac{1}{3}Mr^2 + mr^2)\omega _f^2\\\\K.E_f =\frac{1}{2} [\frac{1}{3}(2.1)(1.2)^2 + (0.055)(1.2)^2]\times (1.61)^2\\\\K.E_f = \frac{1}{2} (1.008 + 0.114) \times (1.61)^2\\\\K.E_f = 1.45 \ J[/tex]
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Which car part tells the velocity of a car at a given time?
A. Odometer
C. Accelerator
B. Speedometer
D. Fuel gauge
Answer:
Speedometer. It's in the name.
I need help with this will give brainly.
Remote-controlled planes may take over most hurricane-hunting missions
A. Vivid Language
B. Objective Language
Answer:
gogo
Explanation:
What are some common positive and negative attitudes toward physical activities? What
is your personal attitude toward exercise and physical activity? What three emotions do
you immediately feel when you think about your health and fitness? What is the
relationship between physical fitness and health? How does physical fitness affect your
personal health?
Analyze Ultrasound uses high-frequency
sound waves to get images of the insides of
our bodies. Sound waves would travel the
fastest through which of the materials listed
in the chart?
Answer:
we have sung a song .change into simple present tense
Differentiate between concave and convex lens. Write your own answer
Answer:
A concave lens is thinner at the center and thicker at the edges while a convex lens is thicker at the centre and thinner at the edges.
Answer:
Read below.
Explanation:
Convex lenses: have a thicker centre than their edges. Converges light rays to a point.
Concave lenses: have thicker edges than their centre. Diverges the light rays passing through it.
Two ways to report the amount of elements is to give the percentage by number and percentage by mass. When reporting the composition of the sun by mass percentage, the amount of hydrogen drops, but the amount of helium grows. Why?
The composition of the sun by mass of hydrogen drops, but the amount of helium grows because helium is heavier than hydrogen.
What is the percentage by mass of an element in a substance?The percentage by mass of an element in a compound is the percentage the mass of that element contributes to the total mass of the substance.
The percentage by mass of an element depends on the mass of the element.
Heavier elements in equal amounts with less dense elements have a greater percentage mass.
Since the mass of the helium atom is greater than the mass of the hydrogen atom, the Sun's composition by mass of hydrogen drops while that of helium increases.
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explain how william gilbert used the scientific method to disprove ptolemy's belief that garlic affected lodestone
Answer:
While maintaining a successful medical practice, Gilbert carried out extensive research into electricity and magnetism. Very little about these phenomena was understood when he began his experiments. The basic magnetic properties of lodestone (magnetic iron ore) were familiar, the magnetic compass had been in use for some time by navigators, and the amber effect (now called the triboelectric effect), by which amber and certain other materials acquire a static charge via friction, was generally known. But no one could adequately explain how or why such things worked. Gilbert’s investigations led him to develop a number of his own theories.
Explanation:
A 30.6 kilogram object is pulled by a horizontal force of 243 newtons causing it to accelerate at 5 meters per second squared. What is the force of friction acting on the
object? Calculate the coefficient of friction of the two surfaces.
Answer:
Ffriction = 90 N
coefficient = 0.3
Explanation:
First, note that the sum of all the forces in the x directions equals the mass multiplied by the acceleration in the x direction.
assuming the direction of the pulling force is positive,
243 N - Ffriction = m * a
m= 30.6 kg
a= 5 m/s/s
Ffriction= 243 - m*a
Ffriction= 243 - (30.6)(5)
Ffriction=90 N
The force of friction is equal to the coefficient of friction multiplied by the normal force on the object. Because the pulling force is completely horizontal, the normal force of the object is equal to its weight, which is m * g, or (30.6 kg)(9.8 m/s/s) = 299.88 N
Ffriction = coefficient * Fnormal
90 = coefficient * 299.88
coefficient = 0.3
Nima explains that visible light occupies the range of the electromagnetic spectrum that humans can see. What other characteristics of visible light can Nima share with her students
Other characteristics that Nima can share with her students are as follows:
Visible light ranges in wavelength of 400 - 700nmVisible light is between the ultraviolet and infrared rays of the EM spectrum. What is visible light?Visible light is one of the components of the electromagnetic spectrum (EM). It is the only part of the EM spectrum that is visible to human eyes.
According to this question, Nima has already shared this characteristics of visible light with her student.
Other characteristics that Nima can share with her students are as follows:
Visible light ranges in wavelength of 400 - 700nmVisible light is between the ultraviolet and infrared rays of the EM spectrum.Learn more about visible light at: https://brainly.com/question/7071188
20 POINTS!!
This box of macaroni is used in both parts of this question.
Find the volume of this box of macaroni. Be sure to show your work and label all units.
Answer:
348
Explanation:
because maths ;)
The box of macaroni are in the shape of a cuboid, and the volume of the cuboid in the same unit will be 348 cm.
What is Volume?A three-dimensional space's volume can be calculated. It is frequently expressed in numerical form using SI-derived units or by different imperial units (such as the gallon, quart, and cubic inch). Volume and length are related by the definition of length (cubed). In contrast to how much space the container occupies, the volume of a container is typically thought of as its carrying capacity or the amount of fluid (liquid or gas) that it could hold.
According to the question, the given values are :
Length, l = 16 cm
Width, b = 7.5 cm
Height, h = 2.9 cm
So, the volume of the Cuboid will be, V : l × b × h
V = 16 × 7.5 × 2.9
V = 348 cm³.
Hence, the volume of macaroni box will be 348 cm³.
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Which of the following determine the chemical properties of an element?
A)Its protons
B)Its inner shell electrons
C)The size of its nucleus
D)Its valence electrons
Answer:
D, valence electrons.
Explanation:
Since the number of shells are dependent on the number of valence electrons, which determines the period of the element. Because each shell of an element holds a total of 8 valence electrons, there is a chemical association that is being made between the outer electrons and the atom.
Answer:
The correct answer is D. Its valence electrons.
Explanation:
The valence electrons are those that participate in reactions with other elements. The fewer valence electrons that an element has, the less stable it becomes; an element with a full valence electron shell does not frequently interact with other elements. In this way, the valence electrons determine the chemical properties of an element.
Hope this helps!
how is the rotation of the sun, different from the rotation of the earth
Answer:
The Sun has a north and south pole, just as the Earth does, and rotates on its axis. However, unlike Earth which rotates at all latitudes every 24 hours, the Sun rotates every 25 days at the equator and takes progressively longer to rotate at higher latitudes, up to 35 days at the poles. This is known as differential rotation.
Explanation:
If you rub an air-filled balloon on your hair, you can make it stick to a wall. when the balloon and your hair are rubbed together, electrons are transferred from your hair to the balloon.
a. what is the net charge on the balloon after it is rubbed on your hair? is it positive, negative, or zero?
b. what do you think happens to the atoms near the wall's surface when the balloon is brought near the wall? (hint: the balloon will stick to the wall.) halloon to a metal
Atoms will be negatively charged whenever they gain electrons. Attraction of atoms is due to opposite charges of the atoms.
a. Negative
b. Atoms near the wall are positively charged.
Static ElectricityThis is the phenomenon whereby the carrier of electric charges are not in motion.
The fundamental law of electrostatic state that like charges repel while like charges attract each others.
If you rub an air-filled balloon on your hair, you can make it stick to a wall. when the balloon and your hair are rubbed together, electrons are transferred from your hair to the balloon.
a. The net charge on the balloon after it is rubbed on your hair will therefore be negative because it has gained electron
b. The atoms near the wall's surface are positively charged. When the balloon is brought near the wall, unlike charges will surely attract each other.
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A projectile is launched straight up. From launch to landing back down takes 8s.
What is its launch velocity?
Does the surface area of the salute, the temperature
of the savent, and the amount or agitation that
loccurs when the solute and the savent are mixed
affect the rate or dissolution, how?
Answer:
if I understand ur question, you mean does the surface area of solute, temperature of solvent and the amount of particles affect the rate of dissolution?
YES
How? The surface area of the solute is the part that is in contact with the solvent. For this reason granules or powdery substance dissolves better than it lumps.
The temperature of solvent also affects dissolution. For solid solutes, increase in temperature causes solute to disslove better but for gases increase in temperature reduces their solubility
Amount of particles also affect dissolution. A quantity of solvent has limited number of particles it can dissolve. If the particles are more than the solvent can dissolve,the excess particles will precipitate out
Good evening! Can someone please answer this, ill give you brainliest and your earning 50 points. Would be very appreciated.
Explanation:
Broderline Green house gases are Carbon dioxide, sulphur dioxide etc.These gases absorb long wave photons of infrared light .It simply increases the temperature of our atmosphere .It becomes a reason behind increase in sea levelOption B is correct
A ball is gently dropped from a height of 30m. If its velocity increase uniform at the rate of 10m/s with what veloscity will it stricks the ground ? After what time will it stricke the ground?
Answer:
∆y=30m
Vi=10m/s
a=9.8
Vf=?
(1)Vf²=Vi²+2a∆y
Vf²=(10)²+2(9.8)(30)
Vf²=100+588
Vf²=688
√Vf²=√688
Vf= 26,23
(2) Vf=Vi+a∆t
26,23=10+9,8∆t
16,23=9,8∆t
∆t=1,66 sec
PLEASE HELP ASAP !! I WILL MARK YOU BRAINLIEST!!
Answer:
A -- Correct (what you have on the paper)
B -- (Sphere A - negative 6 ) (Sphere B - negative 6) (Sphere C - positive 9)
(Total - negative 3)
Explanation:
Hope this helps! Please let me know if you need more help, or if you think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!
Answer:
Explanation:
a. Total charge = sum of charges of A, B and C
= -4 + -8 + 9
= -3.0C
b. After touching each other, the charges on A and B will equalized. When separated, they have the same charge = (-4 + -8) / 2 = -6.
Charge on C and the total charge will not change.
A : -6.0C
B : -6.0C
C : +9.0C
Total : -3.0C
PLEASE HELP, IS URGENT
Answer: around 65.
Explanation:
You are given a diameter of 10 cm (this is x value). find what y value is equal to at those 10 cm. You’ll see that it’s aroun 65
Which property describes the temperature at which a liquid changes to a gas?
Group of answer choices
freezing point
boiling point
melting point
condensation point
Answer:
Boiling Point
Explanation:
When a liquid changes to a gas is called the boiling point.
The weather in Detroit will likely be rainy because Mike noticed a(n) _________ near Detroit.
Question options:
occluded front
stationary front
cold front
warm front
Answer: stationary front
Explanation:
2- Two materials, A and B, are used to make cables of
identical cross section and length, to lift identical loads.
If A has a greater Young's Modulus than B, which cable
will stretch the most when loaded? Explain why.
Answer:
Cable B will more stretch the most.
Explanation:
Given that,
Length of material A =[tex]l_{A}[/tex]
Length of material B =[tex]l_{B}[/tex]
If A has a greater Young's Modulus than B.
We know that,
The deflection is defined as,
[tex]\delta=\dfrac{Wl}{AE}[/tex]
For material A,
[tex]\delta_{A}=\dfrac{W_{A}l_{A}}{A_{A}E_{A}}[/tex]
[tex]\delta_{A}\propto\dfrac{1}{E_{A}}[/tex]
For material B,
[tex]\delta_{B}=\dfrac{W_{B}l_{B}}{A_{B}E_{B}}[/tex]
[tex]\delta_{B}\propto\dfrac{1}{E_{B}}[/tex]
The deflection is inversely proportional to the young's modulus.
We need to find which cable will stretch the most when loaded
Using formula of deflection
[tex]\dfrac{\delta_{A}}{\delta_{B}}=\dfrac{\dfrac{W_{A}l_{A}}{A_{A}E_{A}}}{\dfrac{W_{B}l_{B}}{A_{B}E_{B}}}[/tex]
Put the value into the formula
[tex]\dfrac{\delta_{A}}{\delta_{B}}=\dfrac{\dfrac{Wl}{AE_{A}}}{\dfrac{Wl}{AE_{B}}}[/tex]
[tex]\dfrac{\delta_{A}}{\delta_{B}}=\dfrac{E_{B}}{E_{A}}[/tex]
So, [tex]\delta_{B}>\delta_{A}[/tex]
Hence, Cable B will more stretch the most.
How long does it take for uranus to rotate on its axis.
Answer: 17 hours
Explanation:
A boy weighing 50 kg is running at 2m/s. What is its kinetic energy? *
10 points
You do 25 J of work while using a hammer. The hammer does 18 J of work on the nail. What is the efficiency of the hammer?
physical science
help please
Answer:
The efficiency of the hammer is 72%.
Explanation:
output work/input work x 100%
18J/25J x 100%
0.72 x 100%
72%
applied a force of 55 N to accelerate a 10 kg box at 3 m/s2 along a horizontal surface. What is the magnitude of the frictional force?
Answer:
25N
Explanation:
if you calculate it right the answer will be 25
An object is in simple harmonic motion. of the following quantities related to the object, which set of three can have maximum magnitudes at the same instant of time?.
The amplitude, restoring force and speed of an object undergoing simple harmonic motion may have maximum magnitudes at the same instant of time.
What is simple harmonic motion?Simple harmonic motion is a regular repeating motion. The acceleration of a simple harmonic motion is always directed towards the center of the motion.
There are three quantities related to the object that can have maximum values at the same time and these are;
AmplitudeRestoring forceSpeedLearn more about simple harmonic motion:https://brainly.com/question/17315536
If the Voltage is increased Current decrease what happens to the resistance
A 12. 0 V battery delivers a 1. 20 A current to an electric motor that is
connected across terminals. What power is consumed by the motor?
O 14. 4 w
O 14. 4J
O 10. 0 J
O 10. 0 W