Answer:
The time it takes for the change in the angular velocity to occur is 6.5 seconds
Explanation:
From the question, we have;
The angular acceleration of the wheel, α = -4.20 rad/s²
The final angular velocity of the wheel, ω = -26.0 rad/s
From the information, we have the initial direction of rotation of the wheel = Counterclockwise
The angular displacement while the change occurs = 0 rad/s
Therefore, the initial angular velocity of the wheel, ω₀ = 0 rad/s
We have;
[tex]\alpha = \dfrac{\omega -\omega _0 }{t - t_0}[/tex]
Where;
t - t₀ = The time it takes for the change to occur
[tex]\alpha = \dfrac{\omega -0 }{t - 0}[/tex]
When t₀ = 0, we have;
t - t₀ = t
[tex]\alpha = \dfrac{\omega }{t}[/tex]
[tex]\therefore t = \dfrac{\omega}{\alpha }[/tex]
[tex]\therefore t = \dfrac{-26 \, rad/s}{-4 \, rad/s^2 } \approx 6.5 \, seconds[/tex]
The time it takes for the change in the angular velocity to occur is t - t₀ = 6.5 seconds
(04.02 LC)
Which of the following is the name for a substance made of two or more types of atoms that are not chemically bonded together? (2 points)
Select one:
a. Compound
b. Mixture
c. Solute
d. Molecule
Answer: mixture
Explanation: mixture contains two or more substances which are not chemically bonded together
Answer:
B. Mixture
Explanation:
Homework B5
Grade 9
March 2021
Name: ......M
Saya....... Nambert......
1- The density of fresh water is 1000 kg/m². The pressure gauge on the submarine in
a river was reading 100 kPa when it was at the surface. A sailor notices that the
gauge is now reading 250 kPa. How deep is he? How would this answer change if
the sailor were diving in sea water is slightly denser than fresh water? [3]
Answer:
I hope this helps a little bit.
True or false, not all substances are soluble in water.
Answer:
I think ur answer would be true
Explanation:
hope this helps
How many joules of heat energy are needed to raise the temperature of 10.0 g (0.0100 kg) of aluminum from 22 K to 55 K, if the specific heat of aluminum is 897 J/kg * K. Explain your answer
Answer:
296.01 J
Explanation:
From the question,
Q = cm(t₂-t₁)....................... Equation 1
Where Q = quantity of heat, c = specific heat capacity of aluminium, m = mass of aluminium, t₁ = Initial temperature, t₂ = Final temperature
Given: c = 897 J/kg.K, m = 0.01 kg, t₁ = 22 K, t₂ = 55 k
Substitute these values into equation 1
Q = 897×0.01×(55-22)
Q = 897×0.01×33
Q = 296.01 J
Hence 296.01 Joules of heat is required.
Difference between dynamo and generator
Answer:
Dynamos and Generators convert mechanical rotation into electric power.
Dynamo - a device that makes direct current electric power using electromagnetism
Generator - used to describe an alternator that creates AC power using electromagnetism.
Explanation: so dynamo makes direct electric power using electromagnetism. A generator creates AC power using electromagnetism
Brainliest for correct answers :)
Please look at both pictures and answer correctly for brainliest
Answer:
a. 1100 meters.
b. Between B and C
c.1. Between point D and E
c2. Between point D and E
d. 3.7 m/s.
Explanation:
The girl travels the distance of 1100 meters from starting to the end. There is no motion occurs between B and C due to no change of distance value from 200 meters. Between point D and E, the girls covers 500 meters long distance and also covers fastest distance between point D and E because between point D and E, the girl covers 500 meters distance in 30 seconds which is the highest of all. The average speed of the girls is 3.7 meter/seconds if we divide total distance i.e. 1100 meters by time which is 300 seconds.
One mole of titanium contains how many atoms?
O A. 60.2 x 1024
O B. 6.02 x 10-23
O C. 1.0
O D. 6.02 x 1023
SUBMIT
Answer:
[tex]\boxed {\boxed {\sf D. \ 6.02*10^{23} \ atoms}}[/tex]
Explanation:
One mole of a substance contains the same amount of representative particles. These particles can be atoms, molecules, ions, or formula units. In this case, the particles are atoms of titanium.
Regardless of the particles, there will always be 6.02*10²³ (also known as Avogadro's Number) particles in one mole of a substance.
Therefore, the best answer for 1 mole of titanium is D. 6.02*10²³ atoms.
Answer:
D) 6.02 x 1023
Explanation:
A.P.E.X
Brainliest for correct answer in newtons :)
Answer:
This is your answer
Answer:
120 N
Explanation:
1 N = 1kg
120 N = 120kg
Hope this helps!
C. Move the light bulb back and forth. No matter where the light bulb is located on the central axis, what is always true about size of the image?
Answer
It will stay the same!
Explanation:
If you so happen to move something from left to right, the size of it is not being shrunk or expanded in any type of way, shape, or form.
Compare the concepts of mass and weight. Name three differences.
Answer:
1a)Mass is the amount of matter in the body.
1b)Weight is the measure of the amount of force acting on a mass due to acceleration and gravity.
2a)Mass can never be zero
2b)Weight can be zero if no gravity acts upon an object. like in space
3a) Mass does not change according to location.
3b)Weight varies according to location.
What is MyPyramid?
a.exercise program
b.health insurance plan
c.method of treating mental illness
d.guidelines for healthful eating
Answer:
d
Explanation:
lol Hope's this helps lovely
1. What is the mass of an object moving at 13 m/s and having 3042 J of kinetic energy?
Answer: 36 Kg
Explanation:
Ke= 1/2MV^2
Plug in the kinectic energy (3042 J) and solve for M.
3042= 1/2 (M) (13^2)
M= 36 Kg
If I keep F constant in F=ma, what is the relationship between m and a?
Answer:
If F is a constant, we can take f = 1
f = m×a
ma = 1
therefore we can say that force is hence proportinal to the product of mass and acceleration.
PLS HELP! QUESTION (2/2)
Two blocks, one of mass 1.00 kg and 4.00 kg are tied together with a massless rope as in the image. This rope is strung over a massless, resistance-free pulley. The blocks are released from rest. Find the tension in the rope and the acceleration of the blocks.
Which of these is an example of acceleration?
A) a bicyclist turning around a corner
B) a car traveling south with its cruise control set
C) a bus traveling north at 25m/s
D) a helicopter waiting to take off
You can download answer here
tinyurl.com/wpazsebu
1- An object of weight 2N is fired upwards to a height of 5 m.
Calculate gain in potential energy.
Answer:
PE = 98
Explanation:
PE =mgh
PE= 2 x 9.8 x 5
PE = 98
I hope this helps a little bit.
What would be the mass of an object that has a force of 88N and an acceleration of 12 m/s2?
Answer:
7.33 kg
Explanation:
F = ma
88 N = m(12 m/s^2)
m = 7.33 kg
What is the resistance ratio of two bulbs of 100W and 50W at 250V?
Answer:
This is an interesting and useful question.
With just a bit of algebra and a couple of equations, you can calculate the answer.
The MOST important equation is for Power, P=IV, current times voltage.
You have provided us with a value for the Power of each bulb (100W and 50W) and the voltage of 250V. These are easy numbers. Let's figure out the current through each bulb that produces each power rating.
Current through the 100W bulb = _______
Current through the 50W bulb = _______
(Do these numbers make sense? It would seem as though if the voltages are equal then more current would be needed to generate more power. Right?)
Now we have BOTH the current for each bulb AND the voltage for each bulb.
Time for another equation - the definition of resistance, R= V/I, voltage divided by current.
That should wrap things up for you.
(But, WAIT! Let’s actually MEASURE the resistance of each bulb. We’ve gotta find a resistance meter, also called an ohm-meter, to do this. Do NOT be disappointed if your measurements do not agree with your calculations. Life is WAAAAY too interesting to get hung up on details like this!)
The resistance ratio of the two bulbs is 1/2.
What is meant by electrical power ?Electrical power of a circuit is defined as the time rate of change of work done in an electrical circuit.
Here,
Power in the first bulb, P₁ = 100 W
Power in the second bulb, P₂ = 50 W
Voltage applied to the bulbs, V = 250 V
The expression for electric power in a circuit is given as,
Power, P = V²/R
where R is the resistance of the circuit.
Since, the voltage is same for both the bulbs, we can say that,
P [tex]\alpha[/tex] 1/R or R [tex]\alpha[/tex] 1/P
Therefore, the ratio of resistances of the bulbs,
R₁/R₂ = P₂/P₁
R₁/R₂ = 50/100
R₁/R₂ = 1/2
Hence,
The resistance ratio of the two bulbs is 1/2.
To learn more about electrical power, click:
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Mars is 1.52 times as far from the Sun as Earth is. Predict the time required for Mars to orbit the Sun in Earth days.
The time required for Mars to orbit the Sun in Earth days is 1.87y.
What is Kepler's law of periods?The square of the time period of orbiting is directly proportional to the cube of the mean distance.
The ratio of mean distance, (am /ae)³ = (Tm/Te)²
Substitute the ratio of semimajor axis and time period of earth orbit Te =1 yr, we get
(1.52)³ = (Tm / 1 yr)
Tm=1.87y.
Thus, the time required for Mars to orbit the Sun in Earth days is 1.87y.
Learn more about Kepler's law of periods.
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Brainliest for correct answer :)
Answer:
B
Explanation:
The answer is b that is the final speed - initial speed divided by the time taken
Please mark as brainliest
6. _______________ : when a certain number of waves pass a given point for a certain number of seconds? Group of answer choices A. wavelength C. amplitude D. height B. frequency
Ill give brainly-ist.
Answer:
b
kakanandnanjsnMajdnAnnznnzkkzid
Answer:
Frequency
Explanation:
I just took that test
the energy produced by the internal motion of atoms? electrical , thermal, chemical, nuclear
Answer:
Thermal energy, or heat, is the energy that comes from the movement of atoms and molecules in a substance. Heat increases when these particles move faster. Geothermal energy is the thermal energy in the earth. Motion energy is energy stored in the movement of objects. so the answer is thermal energy
What can astronomical objects that have changing magnetic fields do
Answer:
During an excursion or a reversal, the magnetic field is considerably weakened and allows many more cosmic rays to reach the surface of the planet. These energetic particles from space can be damaging to life on Earth if too many reach the surface.
Explanation:
Radio waves may generate astronomical bodies with fluctuating magnetic fields. A further explanation is below.
Electrical charges nanoparticles, as well as molecules, moved via the circular or spiraling route of the magnetic fields. Somewhat on windsurfing spacecraft, various radio astronomy or communications tools named WAVES documented as well as captured a day of explosions of something like the Sun's chromosphere as well as the electromagnetic radiation of our observable universe.
Learn more about magnetic fields here:
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HELLPPPPpppppppp mMmmeeeeeee
Student B is correct.
(3Ω + 6Ω + 17Ω ) = 26Ω
12v / 26Ω = 0.46 Amperes
Explain why tissues in multicellular organisms are supplied with nutrients using a circulatory system.
Answer:
The tissues in a multicellular organism requires a circulatory system in other to deliver oxygen and food to the tissues while also removing carbon dioxide and metabolic wastes due the complexity of these activities
Explanation:
Multicellular organisms are organisms that are made of more than one cell. the more cells an organism has the more complex certain activities might be for the organism hence the tissues in a multicellular organism requires a circulatory system in other to deliver oxygen and food to the tissues while also removing carbon dioxide and metabolic wastes
A particle was moving in a straight line at 172.8 km/hr. If it decelerated over 120 meters to come to rest, find the time taken to cover this distance.
Answer:
v=s/t
s=vt
t=s/v
t=(120×10‐³)/172.8
(the distance meters has been changed to kilometres)
t=1/1440 hrs
Given ,
list the factor that affect the speed of sound in gases
For a system mass of 600g and a hanging weight of 0.50 N, determine the acceleration of the system
Answer:
A=0.80
Explanation:
a=2×100/time^2. a=2×100/15.86^2. = a=0.80
The acceleration of the system will be 0.833 meters per second square.
What is newton's second law?The behavior of things is predicted by Newton's first rule of motion when all external forces are equal. The first law, sometimes known as the law of inertia, asserts that if an entity's energies are balanced, its acceleration will be zero meters per second.
When all forces are balanced, an object is said to be in equilibrium and won't accelerate. Newton postulated that an item will only accelerate in the presence of a net or uneven force. An object will accelerate if there is an imbalanced force present, altering its direction, speed, or both.
Let 'm' be the mass of the object in kilogram and 'a' is the acceleration of the object in meters per second square. Then the force on the system is calculated as,
F = ma
For a system mass of 600g and a hanging weight of 0.50 N. Convert the mass of the object into kilogram. Then we have
m = 600 / 1000
m = 0.6 kg
Then the acceleration of the system will be calculated as,
0.50 = 0.6 × a
a = 0.833 meters per second square
The acceleration of the system will be 0.833 meters per second square.
More about newton's second law link is given below.
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Question 3 (1 point)
✓ Saved
3
A group of physics students has been given a small stereo speaker and told to use it
for investigating sound waves. After much experimentation, the students discover
that the speaker works by quickly moving in and out. This process pushes the air
around it in little bursts that travel in the same direction as the speaker's motion.
Based on these observations, how should sound waves be categorized?
6
An electromagnetic wave that has transverse vibrations
A mechanical wave that has longitudinal vibrations
An electromagnetic wave that has longitudinal vibrations
A mechanical wave that has transverse vibrations
Activat
Answer:
Soundwave should be categorized as follows;
A mechanical wave that has longitudinal vibrations
Explanation:
Sound wave should be categorized as longitudinal waves that vibrate the particles of the medium transmitting sound energy layer by layer along a path parallel to the direction of propagation of the wave
Therefore, soundwave should be categorized as a mechanical wave because it is generated and propagated by the vibration of a source and the interaction of the source with the particles of the medium in which the source is located
soundwave is also a longitudinal wave because the direction of vibration of th particles of the medium through which the sound wave is transported is in the same direction as the wave
Therefore, sound wave should be categorized as mechanical wave that has longitudinal vibrations.
The soundwave should be categorized where the mechanical wave that has longitudinal vibrations
What is a sound wave?
It should be categorized at the time when the longitudinal waves should be vibrated the particles with respect to the medium transmitting via layer along with it the path should be parallel to the propagation direction of the wave. Also, it should be categorized as the mechanical wave since there should be the vibration of the source.
Learn more about waves here: https://brainly.com/question/1820914
You have two rocks made of the same material that are at the same
temperature. The first rock has three times the mass of the second rock. How
does the thermal energy of the two rocks compare?
A. The second rock has three times the thermal energy of the first rock
B. The first rick has six times the thermal energy of the second rock
C. The second rock has one-third as much thermal energy as the first rock
D. The rocks have the same amount of thermal energy
Answer:
the rocks have the same amount of thermal energy